HomeMy WebLinkAbout1.1 Stormwater Management Plan) URS
Wash ington Divi si on
PICEANCE BASIN
NATURAL GAS DEVELOPMENT PROGRAM
Chevron -~ £b2 u
GARFIELD COUNTY , COLORADO
SPECIFICATION FOR RE-VEGETATION OF DISTURBED AREAS
0 Approve d fo r Co ns tru cti on
B
Updated w ith Specifi c State I County
SMC 12-18-07 Requirements
A Issu e d Pre li minary for Review a nd Comments KC H J RV 8-1 7-07
REV. DESCRIPTION BY CHKD APVD cvx DATE RVWD
REVISIONS
CLIENT: Chevron North America Ex p loration and Productio n
PROJECT: Pi cea nce Basin Na tura l Gas Develop me nt Prog ram
JOB NO.: 29454
DOC. NO.: PBSR-ALL-C IV-SPC-URS-00000-00004-00
H:\_Projects\Chevron\29021_C NAEP\SPECIF ICATIONS\Civil\12·0·004_Revegelalion rev 2 SMC.doc
URS
Washington Division
Chevron
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Date: 4 /29/08 RE-VEGETATION OF DISTURBED AREAS Doc. No . PBSR -ALLC IV-SPC-URS-
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TABLE OF CONTENTS
SECTION PAGE
1. GENERAL ........................................................................................................................................ 3
1.1 Scope ............................................................................................................................................... 3
1.2 Related Specifications ................................................................................................................... 3
1.3 Definitions ....................................................................................................................................... 3
1.4 References and Standards ............................................................................................................ 3
1.5 Submittals ....................................................................................................................................... 4
1.6 Quality Assurance .......................................................................................................................... 4
1.7 Delivery, Storage, and Handling ................................................................................................... 4
1.8 Warranty .......................................................................................................................................... 4
2. PRODUCTS ..................................................................................................................................... 5 )
2.1 Materials .......................................................................................................................................... 5
3. EXECUTION .................................................................................................................................... 6
3.1 General ............................................................................................................................................ 6
3.2 Seeding Methods for Slopes Less than 3% ................................................................................ 6
3.3 Seeding Methods for Slopes Greater than 3% ............................................................................ 7
3.4 Mulching ......................................................................................................................................... 7
3.5 Maintenance ................................................................................................................................... 7
3.6 Workmanship ................................................................................................................................. 8
3.7 Field Quality Control ...................................................................................................................... 8
3.8 Adjusting and Cleaning ................................................................................................................. 8
3.9 Protection ....................................................................................................................................... 8
URS Chevron • Wash ington Di vi sion
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1. GENERAL
1.1 Scope
This Specification covers the site co nditi ons , materials a nd constru ction requiremen ts for native
grass seeding for the Chevron Pi ceance Basin Natural Gas De ve lo pme nt Prog ram. Services for
thi s work shall co nsist of, but not necessa rily be limited to the following: general preparatio n ,
preparation for seeding, seed placement , mul ching , maintenance , workmanship , fie ld quality
control, adjusting, clean ing and protection . State and local laws concern in g pollution abatemen t
will be followed.
1.2 Related Specifications
1.2.1 Spe cifi ca ti on No.12-0-002 -Site Preparat io n and Earthwork
1.2.2 Specification No .12-0-003 -Erosion and Sed im ent Control
1.3 Definitions
1.3.1 Owner: Chevron North America Exploration and Production Company
1.3.2 Engineer: URS Co rp oration Washington Di visio n. All references to Engineer refe r t o th e
En gineer or his/her designated representative.
1.3.3 Con tractor : TBN
1.3.4 Subcontractor: Firm und ertakin g th e scope of work as defined in thi s Specifi cation
1.3.5 State: Refers to th e state of Co lorado
1.4 References , Standards, and Guidance
Th e co des , standards, reg ulations, and guidance documents of th e following organizations in
effect as of August 10, 2007 form a part of thi s Specification to the extent indicated by t he
refere nces thereto :
1.4.1 Occupationa l Safety and Heal th Act (OS HA), 24, C FR 1926, OS HA Standards for the
Const ru ction Indu stry.
1.4.2 Co lorado Depart ment of Transporta tion (COOT), Stand ard Speci fi ca ti ons fo r Road and Bridge
Const ru ctio n.
1.4.3 Bureau of Land Ma nage ment (BLM) -O il a nd Gas, Surface Operating Standa rds for Oi l and Gas
Exploratio n and Developm ent. Fo urth Edition.
1.4.4 Garfield Co unty Vegetation Manag eme nt Guidance -N ox ious Weed List , Reclamation
Standa rd s , Weed Ma nagement Pl an, Re-vegetati on Guidel in es
Shou ld a con fli ct be found to exist between any appli ca ble port ion of th e refe renced codes and
stan dard s and th is Specificati on , the co nfli ct sha ll be sub mi tt ed to the Engineer for resolution
before proceedi ng with the affected work.
URS Chevron
Ill Washington Division
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1.5 Submittals
1.5.1 If requested by the Engineer, furnish an affidavit from each manufactu rer or producer cert ifying
that the materials or products delivered to the Project site meet the specified requirements.
A. However, such certification shall not relieve the Subcontractor from the responsibility of
complying with added requirements specified herein .
1.5.2 Furnish to Engineer, a signed statement certifying that the seed furn ished is from a lot that has
been tested by a recognized laboratory for seed testing , six months prior to date of delivery.
A. Provide certification tags for the seeds.
1.6 Quality Assurance
Qualifications: Work to be performed shall be executed by a single firm who specializes and has
full knowledge and experience in re-vegetating disturbed areas in Colorado using native species
and who has satisfactorily performed work of this type on other projects of comparable size and
scope as thi s Project.
1.7 Delivery, Storage, and Handling
1.7.1 Seed: Deliver each specified seed species to Proje ct site in separate, sealed, original containers
which show an analysis of the seed made by an approved authority.
A. Seed shall be fresh stock and labeled in accordance with U.S. Department of Agriculture
Rules and Regulations under the Federal Seed Act.
B. Upon request of the Engineer or its designated repre sentati ve, submit two copies of
invoices showing type and quantity of seed materials.
1.7.2 Mulch (if used): Do not use o ld dry straw that breaks in the crimping process in lieu of bending.
A. Such straw will not be accepted, and shall be removed from the Project site.
B. All mulch shall be ce rtified noxious weed free.
1.8 Warranty
1.8.1 Photographic documentation of the construction site is required to establish the baseline for the
warranty.
1.8.2 Subcontractor shall continue to monitor the re-vegetated area and reseed areas as required until
the conditions in B. are met.
A. Warranty period shall commence upon acceptance of work by the Eng inee r.
B. Warranty period shall end when the Engineer has determined that the vegetation density
of the reseeded area has reached 70 percent of the original vegetation density.
1.8.3 Reseed all areas where th ere is not a satis factory stand of native grass as determined by the
Engineer. The length of the wa rranty period w ill vary by season and will be agreed to between
Sobco11tractor a11d ~11gi11ee1 at tile ti111e of 1 e-vegetatio11 activit ies.
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A. Pro cess will be repeated until the stand of native grass over all areas designated for re-
vegetation has met the 70 percent of original vegetation criterion . Reseeding sha ll be at
the Subcontractor's expense.
2 . PRODUCTS
2.1 Materials
2.1.1 Seed: Seed shall be in accordance with the seed mix identified in B. Seed and seed labels shall
comply with all current state and federal regulations and shall be subject to the testing provisions
of the association of official seed analysis.
A. Provide fresh, clean, new-crop seed complying with the tolerance for purity and
germination established by the Official Seed Analysts of North America .
B. Provide seed of the grass species, proportions , and minimum percentages of purity,
germination, and maximum percentage of weed seed specified as follows.
Seed Mix for Sites below 7000 ft
Scientific Name Common Name/ PLS/ % of mix Application
Seeds per pound Preferred Cultivar ft2 by PLS Rate (lbs
weight PLS/acre)
Achnathernum hymenoides Ind ian ri ceg ra ss/ 4 12.5 1.25 140,000 Paloma*
Hesperostipa comata comata Needle and thread 4 15 1.5 115,000
Pascopyrum smithii Western wheatgrass/ 10 31 3.1 140,000 Arriba*
Pseudoroegneria spica ta spicata Bluebunch wheatgrass/ 10 31 3.1 140,000 P7
Sitanion hystrix Bottlebrush/squirrelta il 4 10 0.90 192 ,000
Poa canbyi Canby bluegrass/ 4 0.5 0.19 925,000 Can bar
Total 36 100 10.04
* Use only this cultivar, as recommended by Natural Resources Conservation Service and the Co lo rad o Natural
Heritage Program, 1998.
Seed Mix for Sites above 7000 ft
See Attachment 1, which describes seed mixes for three higher-elevation environments developed by the
Bureau of Land Management Glenwood Springs Energy Office (mem o dated April 16, 2007).
C. Notify the Engineer in writing prior to seeding, for review of the following:
• Seed mix to be used .
• Percentage of purity and germination.
• Pounds of pure live seed per pound of seed.
• Selected method of seedi ng.
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D. Furnish seed free from noxious weeds.
E. Do not use seed th at has become wet , moldy or otherwise damaged in transit or in
sto rage .
F. Use only seeds from a lot tested by a recognized la boratory within six months prior to
delivery.
G. Seed purity, germination, and mixture proportions shall meet the requirements listed in B
above.
2.1 .2 Topsoil: Use nearby topsoil stockpiles that were set aside as part of the excavation . Areas with
minimal topsoi l may req uire the add iti on of mulch.
A. See 3.2 and 3.3 for soi l preparation requirements .
3. EXECUTION
3 .1 General
3.1.1 Do not start preparation wo rk until afte r a ll rel ated site work within the areas to be revegetated,
in cluding site utilities, has been completed, tested , and backfilled to th e sat isfaction of th e
Contractor. The following general requirements apply:
A. Seed ing activities should be lim ited to cooler, wetter months (typically September through
June) when condi ti ons are favo rable for germi nation,
B. Fertilization is not required (p romotes rapid weed growth),
C. Do not seed when wind ve locity exceeds five miles per hour, and
D. Sow no le ss than the quanti ty of seed specified.
3.2 Seeding Methods for Slopes Less than 3%
3.2.1 Each species of seed sha ll be in separa t e bags so th at each siz e group of seed can be metered
at the app ropri ate rate.
3.2 .2 Sma ll seeds, such as ca nb y bluegrass (Poa ca nb yl), ca n be difficult to app ly at th e sma ll rates
required. Use of wheat bran o r rice hulls or other adjuvant to assist metering of the small seeds
may be required.
3.2.3 Preferred Method : Multiple Seed Bin Rangeland Drill
A. No soil preparation requ ired othe r than simple grading to sl ope and wate rbars at 50-fo ot
spacing.
3.2.4 Alt erna ti ve Methods
A. Broadcast seeding methods: Seeding rate must be doub led for broad cast appli cation.
1. Harrow: Harrow with just enough soi l moisture to create a rough surface ;
broadcast seed and re-harrow at 90 ' to first ha rrow.
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2. Hand raking and broadcast seeding followed by re-raking at a go · angle to the
first raking .
8 . Hydro-seeding
C. Other methods as agreed to by Engineer.
3.2.5 Application Rates:
A. See application rates in 2.1.1 B.
3.3 Seeding Methods for Slopes Greater than 3%
3.3 .1 Imprinting seedbed is required .
A . Imprinting ca n be accomplished using dozer tracks or furrows perpe ndi c ular to the
direction of the slope.
B. When hydro-seeding, imprinting shall be conducted pri or to seeding.
C. Harrowing and broadcast seeding: imprinting shall be done as part of harrowing .
D. Furrowing : o btain approval for method from Engineer.
3.3.2 If mulch will be crimped into the soil surface, imprinting is not required .
3.4 Mulching
Mulching is not required for most methods. Temp orary and permanent erosion control blankets
may be use d or straw can be crimped into so il during drill seeding .
3.5 Maintenance
Maintain until the revegetated area has reached 70 percent of original vegetat ion den sity.
3.5.1 Begin mai ntenance of se eded areas immediately afte r each area is planted and conti nue until the
Owner's acceptance of the Project.
3.5 .2 Maintain se eded by preventing erosion and replanting as req uired to me et the 70 percent of
original vegetation c rit erion .
3.5.3 Replant bare areas using the same material s specified above .
3.5.4 When maintenance is taken over by the Owner during the guarantee peri od , the Subcontractor
shall periodically inspect the maintenance operation of the Owner.
A. The Subc ontractor shall promptly report to the Owner any methods, practi ces or
operations which he considers unsatisfactory, not in accord with his interest or not in
accord with good hort icultural practices.
8 . Failure of Subcontractor to inspect and report shall be construed as an acceptance of
Engineer operations.
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1. N o claims fro m the S ubcontractor wi ll be re c o gnized thereafter should any
d efects develo p later tha t are th e resul t of s u ch m ethods , practices or oper ati ons.
3 .6 Workmanship
3.6.1 Pe rform all Work in a ca reful a nd o rderl y m a nn er w ith du e cons idera tio n fo r the pr otection of
adj oining prope rty.
3 .6 .2 Keep drainage structur es clean during installation of Work.
3 .7 Field Quality Control
3 .7 .1 Accept ance for St art of Mainte nance : Notify the Contractor or its designat ed representative o f
co mpletion o f a ll seed in g required.
A. Review of seed ed areas wi ll be by the Contrac to r or its designated representative , and he
w ill determ ine whether Work is acceptable a nd w he th er the mainte na nce pe riod can
begin .
3.7.2 Fin al Acceptance: Notify Contractor in w ritin g of co mpleti o n of the required maintenance.
A. Within ten days of own er's notifi cati on, in sp ecti on for fi n al acceptance will be m ade by a
re presenta ti ve for th e Contracto r and th e S ubco ntractor.
B. For final acceptance th e terms of the warra nty must be met and the Proj ect site s hall be
in accept a bl e clean condition .
3.8 Adjusting and Cleaning
3 .8 .1 Work is com plete w he n th e p rem ises are cle ar of all rubbish , refuse and debris, leaving premises
in a clean a nd ord erl y cond itio n .
3 .8.2 Repair d a mage do ne to property on or off premises by reason of requ ired W ork w ithou t a dditi o n a l
cost to the Contract o r.
3.9 Protection
Restri ct foo t a nd vehi cu lar traffi c o n seeded areas until th e comp leti on of t he established per iod.
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Washington Di visio n
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Attachment 1: S e ed Mixes for Environments above 7000 ft
Source: Bureau of Land Management, G lenwood Springs Energy Office , Memo, Apri l 16. 2000
Tablr 1-2 . Pinyo n-Juniptr Woodland a1l<l /or :\Iountain/W yoJUing Big S ngrbnnh S h rnbland
CoJUJU Oll Namr Srirntific ~a JUr s Val'irty Sta son Tonn PLS
lbslacrt•
P lant tht Following (10 % Total)
Indi an Ricegrn ss Aclm111h emm [01)'zops is} Jiy111e11o ides Nezpar, Pal oma. Coo l B1u1ch 1.9 R imrock
a ncl Both o f the F ollowing (15% [ad1 , 30% T o tal)
Galleta Ple11mplli s [Hilatia} _imnes ii Vim fl oiets W :um Bunch 2.5
Bluebunch \Vhe aigra s~ Pse11doroeg11e ria spicara, .-lgropyl'on spican1111 S ecar. P-7, Cool B1u1ch 2.S Anatone
a n<l Onr of t h e F ollowing (20% Total)
T11ich pike W he atg1a % Ely11111s lm:ceolatus Hp. ltm ceola nu, Agropyton Critana, Cool Sod-forming 3A dasuraclnwn Schwen drmar
Sl'11 der Whta tg,ra s~ Elym us n·acl1yca 11/11s, Agrop,11·0 11 michrca11 /11 111 San Lui; Cool Bunc h 3.3
:111<1 Two of the Following (40% T o tal)
Mut1 011g1a % Poa fendlerir111 a Coo l Biwcb 0 .6
Sa ndberg Bluegra s~ Poa scm db~rgii, Poa sec1111da Cool Biwcb 0 .6
Bo ttlebmsh Squinelt ail Elym11s elymoides, !Ma 11io11 Jiysn ix Cool B1u1cb 2.7
'*Bn11•d 011 60 purl! li•'I! lt't'th (PLS) pe1· StJllnr••foot, drill-u11 ded. Dou bit' t lds rn tr (110 PLSpu sq11ar11 foot) if brondcast or /Jyd rost't'ded.
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Tab lt 1-3 . :\Iiu d :\founta in Shrubland, Including O akbrush
Comm o n N a ant Srit ntific :'\a m es Yariety StMOll F orm PLS
l b slacr e •
Plant B oth 1>f tht Following (20% Each , .t 0% T ora!)
Tbichpike \\lheargrass Ely m11s lonccoln n1s ssp lo11ccolot11s, .~gropyro11 C'ritaua . Cool Sod-fo rming 3..t dns1s ro cln 11111 Schweudimar
Blu e bunc b \Vheatgrnss Pse11dorocgnr.rio spirnro, ,~gropyron sp iconim Secar, P -7, Cool B nnch 3 .7 A u atone
a nd One o f the F ollowin g (~0 % Tot al)
Bo ttlebrns h Squ i!l"eltail Elymus clymoidt>s, Sim11 io11 /iysrrix Cool B un ch 2 .7
Slen der Wheatgra ss Elymus tm cl1yc1111 l11s, • .-!grop.11 ·011 n"11cl1.1 cou /11111 San Lui s Cool B unch 3 .3
a nd One o f the F ollo win g (20 % Total)
Canby Blue grass Pon cm1byi, P. sec1111 dn C'a ub ar C ool B unch 0 .6
~hmon B luegrMs Pon fe11 dlc1"im1n Cool B un ch 0 .6
and One of tht Follow in g (lO ~l T 1>tal)
Letterman Needlegrn.ss Ac/m(lflien1111 (Stipa] lette1·1111m ii Cool B1wch 1.7
Co lumbia N eedlegrass Aclmatl1em111 {Stipa]11 clso11ii, Stipa co /11111bi ann Cool Bun ch 1.7
ancl One of tht F o llowing (10% Total )
Ind ian Ricegrn ss Ac/m(lf/ie1w 11 (01yzops is} /1yme11o idcs Nezpar, Palo m a , Cool Bunch 1.9 R inu-ock
June g rass Ko eleria 111nC'l'a111ha, K crisrara Cool B1wch 0 .1
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* .B111"d 011 60 p11 r., ,,.,.., sud > (PLS) p er >q11t1r<' foot, drill-sud<'d. Doub/., t lli1 rar e (1 JO PLS p u sq11 nrt' f oot) if bro ndcnsr or /1 y dro st't'tfnf.
T a blt 1-~. S prnct-Fir Forest, I n cluding :\fountain :\l tadows
Common :-(a m t Scitntific :'\:lints Y:uitty Season F onn PLS
lb slacn•
P l a nt B orh of the F oll owing (20 % Each , .t 0% T om i)
).louutaiu B rome Bromopsis [B ro11111s] 11111rgi1111ms G amet Cool Bunch 5 .8
S l ender \\lheatgrn ss Elym11s n·11cl1yca11/11s, • .-!grop.11·011 n·acllyca11 /11111 San L u is Cool Bunch 3 .3
and T h r ee of tht Fo ll owing (20 % E ach , 6 0% T otal)
Lett erman N ee d l eg,ra s~ Ac/m arluw11111 (Stip11} letterma nii Cool Bunch 3 .5
Blue Wild1ye Elymus glaurns Arling ton Cool Bunch 4 .8
Tbic h pi ke \\ htatg1ass Ely11111s la11ccolnn 1s ssp . la11ccolnnis, .igropyro11 Critana, Cool Sod-forming 3..t das1sracl1111111 Schwend1m ar
Idaho F e~rne Festucn fdahocnsis Jo;eph C oo l Bunch 1.2
Wheel er B luegra ss Pon rie1i ·os11 Cool Sod -forming 0 .6
*.Ba s1•d 011 60 pure /fro> seed s rPLSJ per st1 11 nrt' f oot, drill-1 u tft>d. Do11b lt• rllis rntt' (110 PI S pu sq11a r" f oot) if b1·ondca1r or /1y tfro>t>.,d4'tf.
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) TYPICAL STORM-WATER BEST MANAGEMENT PRACTICE (BMP) DETAILS
Table of Contents
1.0 Filter Berms ........................................................................................................................... 1
2.0 Land Grading ........................................................................................................................ 2
3.0 Level Spreader ....................................................................................................................... 4
4.0 Erosion/Sediment Control Logs/Wattles ............................................................................. 6
5.0 Riprap .................................................................................................................................... 9
6.0 Sedi1ne11t Traps ................................................................................................................... 12
7.0 Silt Fence .............................................................................................................................. 14
8.0 Stra'v Bale Barriers ............................................................................................................ 16
9.0 S11rface Roughening ............................................................................................................ 18
10.0 Terracing .............................................................................................................................. 21
11.0 Vegetative and Grass Buffers ............................................................................................. 23
12.0 Waterbars ............................................................................................................................ 25
13.0 Diversion Ditches/Berms .................................................................................................... 27
14 .0 Gravel Surfacing ................................................................................................................. 29
15 .0 Sediment Control Berms .................................................................................................... 31
16.0 Check Dams ......................................................................................................................... 33
17.0 Drainage Dips ...................................................................................................................... 35
18 .0 Erosion Control Blankets/Mats ......................................................................................... 38
19.0 Slope Drains ......................................................................................................................... 41
20.0 Slope Stabilization ............................................................................................................... 43
21.0 Mulchi11g .............................................................................................................................. 45
22.0 Culverts ................................................................................................................................ 48
23.0 Culvert Inlet and Outlet Protection ................................................................................... 50
24.0 Revegetation ........................................................................................................................ 51
25.0 Turnouts ............................................................................................................................... 53
26.0 Stabilized Entrance/Exit ..................................................................................................... 55
27.0 Retaining Walls ................................................................................................................... 57
28.0 Concrete Washout Facilities ............................................................................................... 58
29.0 Sanitary/Septic (Port-0-Let) Waste Management ........................................................... 61
30.0 I11let Protection .................................................................................................................... 63
31.0 Temporary Sediment Basins .............................................................................................. 70
Doc. No.: PBSR -ALL-RGL-PMT-URS -00000 -00002-00, Rev. F
Chevron No11h America n Exploration and Production Company
Skinner Rid ge Stom1-Water Managem ent Plan
Picean ce Bas in Na tu ra l Gas Deve lopm en t Program
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1.0 FILTER BERMS
Description: A gravel or stone filter berm is a temporary ridge mad e up of loo se gravel, sto ne, or
crus hed rock that slow s, filters, and divert s flow from an open traffi c area and acts as an efficient
form of sed im e nt contro l. A specific type of filter berm is the continuou s berm, a geosy nthetic
fabric that encapsu lates sand, rock, or soi l.
When and Where to use it:
• Grave l or ston e filter berms are most sui tabl e in areas where vehicular traffic needs to be
rerouted because roads are under construction, or in traffic areas within a construction
site.
• The fo ll owing construct ion guidelines should be considered when building th e berm:
o Well-graded grave l or crushed rock shou ld be used to build the berm .
o Berms shou ld be spaced according to th e steepness of the s lope, with berms
spaced closer together as the slope in creases.
o Sediment that builds up should be remov ed and dispo se d of and the filter
material shou ld be replaced . Regular insp ec tion shou ld indicate th e fr equency of
sediment removal needed.
Limitations and When and Where NOT to use it:
• Berm s are intended to be used on ly in gentl y slop in g areas .
• Berms are eas ily damaged by storm -water flow and if not maintained properly, do not
last long.
• Berms require maintenance due to c lo gg ing from mud and so il on veh icle tires.
Construction Detail and Maintenance Req uireme nts:
• Berm s should be in specte d after eve ry rainfa ll to ensure that sediment ha s not built up
and th at no dama ge has been done by vehic les.
• It is important that repairs be perfo rm ed at the first sign of deterioration to ensure that
berms are functioning properly.
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Chevron North Ame ri can Ex pl ora ti on and Production Company
Skinn er Ridge Storm -Wate r Ma nagement Plan
Pi cea nce Ba sin Natural Gas Developm ent Program
2.0 LAND GRADING
Description: Land grading involves reshaping the ground surface to planned grades as
determined by an engineering survey, evaluation, and layout. Land grading provides more
s uitable topography for buildings, facilities, and other land u ses and helps to control surface
runoff, soil erosion, and sedimentation during and after construction.
When and Where to use it:
• Sites with uneven or steep topography or easily erodible soils, because it stabilizes slopes
and decreases runoff velocity.
• Grading activities should maintain existing drainage patterns as much as possible .
• Before grading activities begin, decisions must be made regarding the steepness of cut-
and-fill slopes and how the slopes will be protected from runoff, stabilized, and
maintained.
Limitations and When and Where NOT to use it:
• Improper grading practices that disrupt natural storm water patterns may lead to:
o Poor drainage.
o High runoff velocities.
o Increased peak flows during storm events.
• Clearing and grading of the entire site without vegetated buffers may promote off-site
transport of sediments and other pollutants.
• The grading plan must be designed with erosion and sediment control and storm-water
management goals in mind.
• Grading crews must be carefully supervised to ensure that the plan is implemented as
intended.
Construction Detail and Maintenance Requirements:
• All graded areas and supporting erosion and sediment control practices should be
periodically checked, especially after heavy rainfalls.
• All sediment should be removed from diversions or other storm-water conveyances
promptly.
• If washouts or breaks occur, they should be repaired immediately .
• Prompt maintenance of small-scale eroded areas is essential to prevent these areas from
becoming significant gullies.
• A grading plan should be prepared that establishes and includes:
o Identification of areas of the site to be graded.
o How drainage patterns will be directed .
o How runoff velocities will affect receiving waters.
o Information regarding when earthwork will start and stop.
o The degree and length of finished slopes.
o Where and how excess material will be disposed of (or where borrow materials
will be obtained if needed).
o Berms, diversions, and other storm-water BMPs that require excavation and
filling should be incorporated into the grading plan.
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Pi cea nce Basin Natural Gas Development Program
3.0 LEVEL SPREADER
Description: Level spreaders are devices used at storm-water outlets to spread out collected
storm-water flows into sheetflow (runoff that flows over ground surface in a thin, even layer).
Typically, a level spreader consists of a depression in the soil surface that spreads the flow onto a
flat area across a gentle slope. Level spreaders then release the storm-water flow onto level areas
stabilized by vegetation to reduce speed and increase infiltration.
When and Where to use it:
• Level spreaders are most often used as an outlet for temporary or permanent storm-water
conveyances or dikes.
• Runoff that contains high sedime nt loads should be treated in a sediment trapping device
prior to release into a level spreader.
Limitations and When and Where NOT to use it:
• Can easily develop "short circuiting" (concentration of flows into small streams instead
of sheetflow over the spreader) because of erosion or other disturbance.
• Cannot handle large quantities of sediment-laden storm-water.
Construction Detail and Maintenance Requirements:
• The length of the spreader depends upon the amount of water that flows through the
conveyance.
• Larger volumes of water need more space to even out.
• Level spreaders are generally used with vegetative and grass buffers (also see Vegetative
and Grass Buffers BMP).
• The depressions are seeded with vegetation (also see Revegitation BMP).
• Level spreaders should be constructed on natural soils and not on fill material.
• The entrance to the spreader should be level so that the flow can spread out evenly.
• Level Spreader should have a grade of 0 percent; minimum width should be 6' and
minimum depth should be 6".
• The spreader should be inspected after every storm event to check for damage .
• If ponding or erosion channels develop, the spreader should be regraded.
• Dense vegetation should be maintained and damaged areas reseeded a s needed.
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4.0 EROSION/SEDIMENT CONTROL LOGS/WATTLES
D e scription: An ero sion/sediment control log/wattle consists of a wattle with an excelsior, straw,
compost, or coconut fill material constructed to create a pervious filter, able to facilitate
overtopping. The log/wattle promotes sediment removal on the upgradient side and a reduction in
flow velocities.
When and Where to use it:
• At the top, face and at grade breaks of exposed and erodible slopes.
• As check dams for small runoff volume circumstances (i.e., in roadway ditches and
channels downstream of disturbed soils).
• Around storm drain inlets associated with disturbed areas.
• Outfalls of small drainage channels or structures.
Limitations and When and Where NOT to use it:
• Not suitable for rock subgrades where stakes cannot be securely installed.
• Offer a potential for accidental introduction of undesirable weed species if filled with
straw.
• Not to be used in place of linear sediment barrier such as silt fence.
• Not practicable where large flows are involved.
Construction Detail and Maintenance Requirements:
• Erosion/sediment control logs/wattles should be trenched into the ground a minimum of 2
inches and staked or stapled into the ground .
• Sediment accumulated upstream of wattles should be removed when the sediment depth
upgradient of the log/wattle is within Y2 of the height of the crest or when debris
accumulation compromises the effectiveness of the feature.
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5.0 RIPRAP
De sc ription: Riprap consists of large stone units th at may be grouted in place or planted with
vegetation between units.
When and Wh e re to use it:
• Rock riprap placed in cut-to-fi ll slop e transition s.
• To provide erosion protection at structures, where rock riprap is placed along the soil
interface of concrete and metal structures.
• To provide inlet and out let scour and erosion protection , where rock riprap or grouted
riprap is placed at inl et and out let end s of cu lverts, conduits, or channels.
• Where discharge ve locities and energies at the out lets of cu lverts, pipes or channels are
sufficient to erode the downstream channel.
• At di sc harge out lets that carry continuous flow s of water.
• At points where lin ed conveyances discharg e to unlined conveyances.
Limitations and When and Where NOT to use it:
• Rock riprap transition s reduce erosion on ly wh en they have been sized and built prop erly.
• Loo se rock may be washed away during high flow s.
• Freeze/thaw cycles may break up grouted rip rap .
Construction Detail and Maintenance Requirements:
• A sediment trap below the outl et is reco mmend ed if runoff is sed im ent-lade n.
• In spec t for signs of slope ero sion under and around th e rock prot ection.
• Insp ec t for signs of ero sio n and und ercutting around structures.
• Check for erosion and displacem ent of rock at inlets and outl ets.
• In spec t for displacement of riprap or damage to und erlying fabri c, and signs of sco ur
benea th the riprap or around th e out let.
• Rep lace ro ck and repair as ne eded.
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6.0 SEDIMENT TRAPS
Desc ription: A se dim ent trap consists of an ea rth en berm with a sma ll upstream basi n th at ac t s to
trap runoff and facilitate the settling of suspend ed parti cles , s imil ar to the se dimen t ba sin . The
di sc harge or outl et point is es tabli shed wit h a rip rap weir.
When and Where to use it:
• Sediment trap s can be use d for up stream di sturbed areas less than I acre.
• Where there is sufficient spac e and appropr iate topography.
• Be located in an area that is easily accessib le to maintenance crews for re mova l of
accumulated se diment.
• Po sitioned so that it captures se dim e nt fr om the entire upstream di sturb ed area.
• Where a perm anent detention ba sin is planned for the s ite .
Limitations and When and Wh ere NOT to use it:
• Di sturb ed area s great er th an 1 acre require a se dim ent ba sin.
• Sedime nt trap s are not to be in stall ed in active strea ms.
Construction Detail and Maintenan ce Re quire ment s:
• The se diment trap should be co nstructed wit h cle an fill, free of roots, woody vege tation,
stones , or other objectionable material.
• Locate se dim ent traps as nea r as practica l to areas producing the se dim ent.
• The outl et can be ea rth en, pip e, gra ve l or via an existing stor m drain.
o An ea rthen out let is formed by excavat ion and/or embankm ent and is see ded w ith
te mporary or perm anent vegetation.
o Pipe out lets consist of perfo rated ri ser with outl e t pipe of co rru ga te d metal.
o Pip e out lets sho uld be co nstruct ed in such a way that th e top of the
o embankment is one and a ha lf fe et above th e cres t of the riser. The top 2/3 of the
ri se r should be perfora ted with 1/2-in ch diam eter holes.
o Gravel out lets should co ns ist of a cru shed stone section loca ted at th e low point
of th e embankm ent. Thei r length should be at least s ix tim es th e number of acres
in th e drain age area. The crest of a gra ve l outl et should be one foot below th e top
of th e emba nkm ent.
• A filt er fab ri c can be in stall ed inside th e grave l filter to imp rove sedime nt trappin g
e ffi c iency, but may increase th e prob abilit y of clogg ing the o ut let.
• T ra ps shou ld be in spec ted after eac h storm e vent to ensur e proper drai nage fro m th e
co ll ecti on po ol to determine the nee d for structural repairs.
• Eros ion from the ea rth en embankme nt or ston es mov ed from rock dams shou ld be
rep laced irrunedi ate ly.
• Sediment should be remo ve d from th e basin when its stora ge capacity has reached
approximate ly 50 percent.
• Tra sh an d debri s from aro und dewater in g dev ices should be removed promptly after
rainfa ll eve nts .
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7.0 SILT FENCE
Description: A silt fence is a temporary sediment barrier constructed of filter fabric stretched
across supporting posts. The bottom edge of the fabric is entrenched and covered with backfill.
When and Where to use it:
• On the down gradient perimeters of a construction site.
• On a contour to control overland sheet flow.
• At the top or toe of a steep slope.
• As a form of inlet and/or outlet protection (also see Culvert Inlet and Outlet Protection
BMP).
Limitations and When and Where NOT to use it:
• In areas of concentrated flows such as in ditches, swales or channels that drain areas
greater than 1.0 acre .
• At the top of a slope or at high points which do not receive any drainage flows .
Construction Detail and Maintenance Requirements:
• Place s ilt fence along contours.
• Stakes or posts should be to the downhill side of the fence .
• The bottom of the fabric must be continuously and securely anchored for its entire length
to prevent undermining.
• Increase the elevation at the ends of the silt fence installation to prevent "end runs."
• Inspect silt fences regularly and frequently, as well as after each rainfall event, to make
sure that they are intact and that there are no gaps where the fence meets the ground or
tears along the length of the fence.
• If gaps or tears are found , repair or replace the fabric immediately.
• Remove accumulated sediments from the fence base when the sediment reaches one-third
to one-half the fence height.
• Remove sediment more frequently if accumulated sediment is creating noticeable strain
on the fabric and the fence might fail from a sudden storm event.
• When silt fences are removed the accumulated sediment must be removed as well.
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8.0 STRAW BALE BARRIERS
Description: A straw bale barrier is a temporary sediment barrier consisting of a row of
entrenched and anchored straw bales used to retain sediment from runoff in small drainage areas
of disturbed soil.
When and Where to use it:
• At the base of a slope.
• On the down gradient perimeters of a construction site.
• On a contour to control overland sheet flow.
• As a form of check dam (also see Check Dam BMP).
• As a form of inlet and/or outlet protection (also see Culvert Inlet and Outlet Protection
BMP).
Limitations and When and Where NOT to use it:
• In areas of concentrated flows such as in ditches, swales, or channels that drain areas
greater than 1.0 acre (unless used as a form of check dam).
• At the top of a slope or at high points which do not receive any drainage flows.
• On slopes greater than 10:1 (H:V).
Construction Detail and Maintenance Requirements:
• Locate straw bale barriers on a level contour.
• Straw bales should be placed at a maximum interval of 50 feet (a closer spacing is more
effective), with the first row near the toe of slope.
• Turn the ends of the straw bale b arr ie r up slope to prevent runoff from going around the
barrier.
• Allow sufficient space up slope from the barrier to allow ponding, and to provide room
for sediment storage.
• For installation near the toe of the slope, consider moving the barrier away from the slope
toe to facilitate cleaning.
• To prevent flow behind the barri er, sand bags can be placed perpendicular to the barrier
to serve as cross barriers.
• Maximum flow path to the barrier should be limited to 100 feet.
• Straw bale barriers should consist of two parallel rows with:
o The ends of bales butted tightly.
o Butt joints staggered between front and back rows.
o Each row of bales trenched in and firmly staked.
• Straw bale barriers are limited in height to one bale laid on its side.
• Anchor bales with either two wood stakes or four bars driven through the bale and into
the soil. Drive the first stake towards the butt joint with the adjacent bale to force the
bales together.
• Inspect BMPs prior to forecasted rain, daily during extended rain events, after rain
events, weekly during the rainy season, and at two-week intervals during the non-rainy
season.
• Straw bales degrade, especially when exposed to moisture . Rotting bales will need to be
replaced on a regular basis.
• Replace or repair damaged bale s a s needed .
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) • Repair washouts or other damages as needed.
• Sediment that accumulates in the BMP must be periodically removed in order to maintain
BMP effectiveness .
• Sediment should be removed when the sediment accumulation reaches one-third of the
barrier height.
• Remove straw bales when no longer needed. Remove sediment accumulation, and clean,
regrade, and stabilize the area.
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9.0 SURFACE ROUGHENING
Desc ription : Surface ro ughening is a tem porary eros ion co ntrol pra cti ce whereby the soi l surface
is roug hened by the crea ti on of grooves, depress ions, or steps th at run para ll e l to t he co nt o ur of
th e land .
Wh en and Where to use it:
• Surface roughening is appropr iate for all slopes and should be performed immediate ly
after rough grad es have bee n es tabli shed in an area.
• Surface roughening can al so be use d to he lp estab li sh vegetative cover by reducing runo ff
ve loc ity and g ivin g see d an oppo rtunity to take hold and grow.
• Surface rough enin g can be use d in co mbin ation wit h other eros ion co nt ro l meas ures suc h
as mulching and seedin g.
Limit ati ons and When and Wh ere NOT t o use it:
• Slopes that are not smooth-grade d and are le ft suffi c iently rough after fin al gra din g do
not need further ro ughenin g to co nt rol ero sion.
• Surface roughening alon e is not s uffi c ient to stabili ze a s lope for long period s of tim es,
further stabili za ti on meas ures should be implemented within two week s of gra ding.
• Ex tr emely sandy or ro cky so il s are not well suited for sur face roug hening ..
Co nstructi on Detail and Mainte nance Req uirem ent s:
• Cu t Slope Roughening:
o Stair -ste p grad e or groove the cut s lopes that are steeper than 3: I.
o Use sta ir-step grad in g on any erod ibl e mat erial soft eno ugh Lo be rip ped with a
bulldoze r. Slopes cons isti ng of so ft rock with some subso il are particular ly sui te d
to sta ir-step gra din g.
o Make th e verti ca l c ut di stan ce less than th e hor izontal di stance, and sli ghtl y slope
the horizo nt al po siti on of th e "step" in towa rd the ve rti ca l wa ll.
o Groo ve th e slope usin g mac hin ery to crea te a seri es of rid ges and depressions
th at run across th e s lope, on th e co nto ur.
• Fi ll S lope Rou ghenin g:
o Pla ce fill s lopes with a grad ie nt steeper th an 3: I in lifts not to exceed 8 in ches,
and make s ure each li ft is prop erly compacted.
o Ensur e that th e face of the slope co nsists of loose, uncompac ted fill 4 -6 in ches
deep .
o Use groov in g or tra ckin g to roughen th e fa ce of th e slopes, if neces sa ry.
o Apply see d, fert il izer and straw mu lc h then trac k or pu nch in the mulch w ith the
bulldozer.
o Do not blade or scra pe the fina l slope face.
• Roug henin g With Tracked Mac hin ery:
o Limit roughening with tracked mac hin ery to so il s with a sa ndy tex tu ra l
compon ent to avoid undu e compact ion of the so il s urface.
o Operate tra cked mac hin ery up and do wn th e slope to leave hori zonta l depress ions
in th e so il. Do not back-b lad e durin g th e fin al gradi ng operation.
o Immedi ately see d a nd mul c h roughened areas to obta in o ptimum see d
ge rmin ati on and grow th .
uriHg coHstrttctioH, iH speet BMP s dai ly duriAg the workweek.
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• Schedule additional inspections during storm events.
• Check for erosion and sloughing, and mak e any required repairs.
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Skinner Rid ge Storm-Water M anagement Pla n
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) 10.0 TERRACING
Description : Sediment can be co ntroll ed and runoff interrupt ed to reduce eros ion on slopes that
are particularly steep by the use of terracing . During grading, relativ e ly flat sec tion s, or terraces,
are crea ted and se parated at inte rva ls by slop e seg ment s. The slope seg men ts are prone to erosio n,
however, and must be maint ai ned.
Wh en and Wh ere to us e it:
• Gradient terrace s are most suitable for use in areas with existing or ex pec ted water
erosio n problems and limited or no vegetation, and they are only effec ti ve when th ere are
su itabl e runoff outlets pro vi ded.
• They are usually limited to use on lon g, stee p slopes with water eros ion probl e ms, or
where it is anticipated th at water erosion will be a problem.
Limitation s and When and Wh ere NOT to use it:
• Terraces should not be co nst ructed on slopes containing rocky or sa ndy so il.
• Terraces are not appropriate for use on steep or shallow soils.
• If too much water permeates the so il in a terra ce sys tem, sloughing co uld occur, and c ut
and fill costs could in crease sub stantially .
Construction Detail and Maintenance Requirements:
• Gradient terrace s should be designed with adequate and appropriate outlets and should be
in sta ll ed according to a well -developed plan after co nduction of an engin ee ring su rv ey
and layo ut.
• Acceptable outl ets include grassed wa ter ways, vegetated areas, or til e outlet s.
• Any ou tl et that is use d should be able to redirect surface runoff away from th e terra ces
and toward an area that is not susceptibl e to erosio n or other damag e.
• General spec ifi ca tion s req uire that:
o Wh e neve r po ss ibl e, vegetative cover should be use d in th e outlet.
o At the junction of the terrace and th e outlet, th e te rra ce's water surface des ign
elevation should be no lower than the outlet's water surfa ce des ign elevation
when both are performin g at design flow.
o During co nstruction of the terrace system, du st co ntrol pro ced ures should be
followed.
o Proper vegetation/stabilizati on practices should be follow ed while co nst ructin g
terraces.
• Regular in spections of th e terraces should occ ur after any major storm s and at leas t once
a year to ens ure that th e terraces are structurally sound and have not been subj ec t to
eros ion .
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11.0 VEGETATIVE AND GRASS BUFFERS
Desc ription: Vegetative and grass buffe rs are use d to maintain vegetated areas th at are down
gradient of earthwork activiti es . Creating or leaving ex isting green be lt s intact ca n slow she et
flow s, act as a natural se diment barri er and protect th e s it e perimeter.
When and Where to use it:
• At the bottom of sloped imp erviou s areas .
• Wh ere overland sheet flow rathe r than concentrated or channelized flow will occur.
• Wh ere lar ger sedi ment from runoff off is anticipated from imp ervious area s.
• Vegetative and grass buffers can al so be combined with rip ar ian zones in trea ting sheet
flows and in stabilizing channe l bank s adjacent to major drainageways and receiving
waters.
• Veget ative and grass buffers can be inte rspers ed with shrub s and trees to improv e their
aest hetic s and to provide shading .
• Are typically lo cated adjacent to imp erviou s areas.
Limitation s and When and Wh ere NOT to use it:
• Where concentrated runoff occurs.
• May require the use of a porou s pavement strip or anot her type of st ructur e to ac hi eve
uniform shee t-flow conditions.
• Provide only marginal pollutant removal.
• Veget ativ e and grass buffers require follow -up structural BMPs to be provid ed.
Construction Detail and Maintenance Require ment s :
• Vegetative and grass buffers should be in co rporated into site drainage, stree t drainage,
and ma ster drainage planning .
• Beca use their effectiv ene ss de pend s on having an even ly di stribut ed shee t flow over th e ir
surfac e, the size of th e contributing area, and the associated vo lum e of runoff have to be
limited .
• Flow can be directly accepted fr om an imp erviou s are a s uch as from parking lot s and
building roofs, provided th e flow is di stributed uniformly over the st rip .
• Should be protected from excessive pedes trian or vehicular traffic that ca n damage th e
grass cover and affect even s he et-flow di stribution .
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12.0 WATERBARS
Description: Waterbars are diversion ridges or berms and c hanne ls (con s isting of compacted so il ,
loo se rock , or gravel) that are built diago n a lly across a roadbed and serve to gather a nd s hed
s urface runoff off the roadbe d. Wate rb ars ca n divert runoff from an in side ditch to a n adeq uate
outfall and re duce runoff flow le ngths and velocities.
Whe n and Whe re to use it:
• Pl an tin g or application of seed for pe rmanent reveg e tation and stabilization of di sturbed
soils .
• Temporary protecti on of dis turbe d areas until pe rmane nt measures (e.g., vegetation ) are
in sta ll ed.
• Temporary protection of di sturbed areas that mu st be re -disturb ed followin g an extended
period of inactivity .
Limitations and When and Where NOT to use it:
• The fo llowing factor s may make the use of wate rbars diffi cult or impossibl e:
o Shallow be drock depth.
o Steep outfall slope s.
o Ste ep roadway s lopes (g reater than 11 pe rce nt).
o High traffi c -high ve hi c le traffic can damage waterbars .
• Drainage areas mu st be limited to less than 1.0 acre .
• W ate rbar spac ing mu st be close e nough to dissipat e wate r flow e ne rgy.
Construction Detail a nd Mainte nance Re quire me nts:
• Ang le waterbars ac ro ss roadbeds in the down-gradie nt direction. Angles of 30 to 45
degrees are mo st effec tive.
• Tie th e uppe r e nd into the in s id e ditch's bank, whe n present.
• The outl et should be ope n and ex tend far e n ough off the roadbed into a sta ble and
undi sturb ed area.
• The o utl et should have a grade of 2 percent less than natural grade.
• Follow the wat e rbar s pacing guide be low on long sloping roadbed s:
o Road grade 2 pe rcent -Spacing 250 fe et.
o Road grade 3 pe rcent -Spacing 220 feet .
o Road grade 4 pe rcent -Spaci ng 190 feet.
o Road grade 5 pe rcent -Spacing 160 fe et.
o Road grade 6 percent -Spac in g 144 fee t.
o Road grade 7 percent -Spac ing 128 fee t.
o Road grade 8 pe rcent -Spacing 112 fee t.
o Road grade 9 percent -Spacing 96 fee t.
o Road grade 10 perce nt -Spacing 80 fe et.
o Road grade 11 pe rce nt -Spacing 60 fee t.
• Si gns a le rtin g motori sts of the waterbar should be in stalled in both directions.
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Chevro n Nonh Am erica n Ex pl ora ti on and Production Co mpany 25
Skinn er Rid ge Stom1-Water Man ageme nt Plan
Pi cea nce Ba sin Natu ra l Ga s Developm ent Program
Figure:
,., .. . , .....
. ,.1·'
......... ,, . .... , .....
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Ch evron North American Exploration and Production Company 26
Skinner Ridge Storm-Water Management Plan
Piceance Basin Natural Gas Developm ent Program
13.0 DIVERSION DITCHES/BERMS
D escription: A diversion ditch/be rm is a small, te mporary earthen channel or berm used to divert
and convey runoff, usually to a sed iment basin, trap, or pond. Depe nding on s lope and antic ipated
flow s, the div e rsion ditch may need to be lin ed with erosion control blankets, check dams, or
plasti c (temporarily ).
Whe n and Where to us e it:
• To dive rted runoff away from s teep s lopes .
• A permanent or temporary diversion ditch, dive rs ion berm or both s h ou ld be in sta ll ed
above a ll s teep s lopes on the s ite that may recei ve conc e ntrate d or s heet fl ows.
• Where steep cut slopes are planned near the s it e perimeter s, a minimum of 6 feet between
the prope rty line and the top of the cut s lope s hall be reserved for the dive rs ion ditch.
• To capture runoff e ntering a si te via s heet flow .
• If the upstream di s turbed drainage area exceeds 1.0 acre, a dive r s ion d itc h, divers ion
berm or both can be used to convey runoff to a se diment bas in.
Limitations and When and Whe re NOT to u se it:
• Concentrated runoff in the ditch or be rm has increased e ro sio n pote ntial.
• To alleviate e ro sion potential, divers ion ditches and berms must be directed to sedime nt
trapping devices, where erosion sediment can settle out of the runoff before be ing
discharged to surface waters.
• Examples of appropriate sediment trapping devi ces that might be used in conjunction
with temporary dive rsion structures include sedime nt bas ins o r other st ru ctures designed
to allow sediment to be collected for proper di spo sa l.
Construction De tail and Maintenance R e quire me nts:
• F low from divers ion ditc hes/berms s hould be directed to a strea m or drainage channel.
• Divers ion ditches/berms that have mild s lopes may be unlin e d, whereas s teepe r ditc hes
and rundowns must be lin ed with erosion control blanket (for mod erate s lo pes), plastic
(temporary installati ons on ly), or riprap.
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) 14.0 GRAVEL SURFACING
Description: Gravel sur facing simply involves covering expose d ea 1t h surfa ces with grave l to
prevent so il eros ion from occun-ing.
When and Where to use it:
• On any ex posed eart he n area s, including:
o Roadways.
o Parking areas.
o Laydown , stag in g, and storage area s.
o Around foundations of st ructures, in cl udin g where roof drains di scharge.
Limitations and Wh en and Wh ere NOT to use it:
• Any locat ion where co ncent rated storm-water fl ow will erode th e gravel surface and/or
und erl yin g soi l.
• Grave l should not be use d in pla ce of riprap.
Cons tructi on Detail and Maintena nce Requ irement s:
• Engi nee rin g de sign is required for grave l to be used on roadway s, parking areas, and
around fo undat io ns, in cludin g proper crow nin g features and to meet appropriate
co mpactio n requirement s.
• Sel ec tion of grave l size an d depth sho uld conside r th e use of th e area to be covere d,
includin g facto rs suc h as type s and frequency of t raffic, duration of estab li shm ent
(temp orary or permanent), anticipa ted storm-wa ter vo lumes (due to direc t prec ipit ati on
and surroundin g area runon/run off), etc .
• Prop erly blended road grave l is req uired to produc e good surfaces. Good grave l conta in s
grave l, sa nd and fin es (clay and s ilt). Good blend s have a mi xture of all thre e, with clay
se rving as th e bind er that he lp s hold the grave l in place.
• Perm ea bl e fabri c membranes/liners should be in sta ll ed at the so il and gravel interface to
preve nt rutting and so il and mud from ris ing through th e grave l due to traffi c impact s.
• Binders such as ma gnesium chl oride may be app li ed to he lp fix and sec ure grave l
sur faces in pl ace.
• The co nditi on of grave l surfaces should be in spec ted regularly, after any major stor ms
and at least once a yea r to ensure that the surfaces and s ub surfaces are so und and have
not bee n subj ec t to eros ion .
• Grave l shou ld be rep le ni shed du e to losses from co mpa ction, drag-out, and spreading,
espec ially in hi gh-traffic areas.
• Grav el may need to be replaced if so il or mud ri ses thro ugh or is trac ked by traffi c into
grave l areas.
• Grave l sur faces may need to be rep laced and/or repaired fo ll ow in g winter seaso ns,
es pec iall y if surfaces are plowed fo r sno w remova l.
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) 15.0 SEDIMENT CONTROL BERMS
Description: A temporary sediment barrier consisting of salvaged topso il, surface soi ls and/or
compacted vegetation pushed into a sma ll berm at midslope locations or at the top or toe of fill
s lopes. A sediment control berm intercepts sediment-laden sheet flow runoff, allowing runoff to
infiltrate and sediment to drop out of s uspension. It also a ll ows stockpiling of topso il for future
plating on s lopes.
When and Where to use it:
• Below the toe of exposed a nd erodible slopes and soil stockpiles.
• May be utilized in place of si lt fence .
• May be constructed in conjunction with topsoil s alvage operations.
• Soil may be reincorporated into adjacent slopes upon completion of final slope geometry.
Limitations and When and Where NOT to use it:
• May require additional BMPs where concentrated flows are in volved .
• Can create a temporary sedimentation pond on the upstream s ide of the berm.
• Must be graded out prior to application of BMPs and seed to final slopes.
• Additional BMPs are required where profile s lopes exceed 3 percent.
Construction Detail and Maintenance Requirements:
• Berm soil sha ll be stab ili zed to prevent erosion.
• Create a stabi li zed we ir where runoff wi ll pond and overtop berm.
• Ins pect for breaks and e rosion in berms.
• Repa ir as necessary .
• R e mov e berm when up-slope area ha s been permanently stabilized. Grade area to blend
in with adj acent ground.
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Skinner Ridge Stom1-Water Management Plan
Piccance Basin Natural Gas Development Program
16.0 CHECK DAMS
Description: Check dams are small, temporary or permanent dams constructed across a drainage
ditch, swale or channel to reduce the velocity of concentrated flows and to trap sediment eroded
from upstream. Check dams can be constructed out of rocks, gravel-filled sandbags or straw
bales.
When and Where to use it:
• In open channels that receive flow from drainage between I and 10 acres.
• In steeply sloped swales.
• In swales that need protection during the establishment of grasses or prior to installation
of a non-erodible lining.
Limitations and When and Where NOT to use it:
• In live streams.
• In channels that receive flow from drainage areas greater than 10 acres.
• In channels that will be overtopped by flow once the dams are constructed.
Construction Detail and Maintenance Requirements:
• Check dams can be constructed of rock, logs, sandbags, or straw bales:
o When using rock or stone, the material diameter should be 2 to 15 inches.
o Logs should have a diameter of 6 to 8 inches.
• Dams should be installed with careful placement of the construction material.
• All check dams should have a maximum height of 3 feet.
• The center of the dam should be at least 6 inches lower than the edges to create a weir
effect that helps to channel flows away from the banks and prevent erosion.
• Additional stability can be achieved by implanting the dam material approximately 6
inches into the sides and bottom of the channel
• When installing more than one check dam in a channel, outlet stabilization measures
should be installed below the final dam in the series.
• Because this area is likely to be vulnerable to further erosion, riprap, geotextile lining, or
some other stabilization measure is recommended.
• Check dams should be inspected after each storm event to ensure continued effectiveness.
• During inspection, large debris, trash, and leaves should be removed.
• If erosion or heavy flows cause the edges of a dam to fall to a height equal to or below
the height of the center, repairs should be made immediately.
• Accumulated sediment should be removed from the upstream side of a check dam when
the sediment has reached a height of approximately one-half the original height of the
dam (measured at the center).
• All accumulated sediment should also be removed prior to removing a check dam.
• Removal of a check dam should be completed only after the contributing drainage area
has been completely stabilized.
• Permanent vegetation should replace areas from which gravel, stone, logs, or other
materials have been removed.
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Piceance Basin Natural Gas Development Program
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) 17 .0 DRAINAGE DIPS
Desc ripti on: Drainage dip s a re rid ges or rid ge -and -c hann els con struct ed di agonall y ac ro ss a
s loping ro ad or utility ri ght-of-way that is subj ect to ero s ion to limit th e ac cumulati on of ero sive
vo lumes of wat er on road s by di ve rtin g surface run off at des ignated inter va ls. Th ey are s imil ar in
function to wa terbars (al so see Waterb ar BMP). Drain age dip s can be co nstru cted as eith er: (1 )
Rollin g Dip s or (2) Broad-Base d Dip s. Broa d-B ase Dip dra in s wa ter fr om the roadb ed whil e
all owing ve hi c les to maint ain a sa fe tra ve lin g spee d. A R ollin g Dip is a broad-ba se dip with a
water bar be rm. Both types o f dip s gath er water and div ert it safe ly off th e roadw ay. Dip s
pro vide cro ss dra ina ge of in s id e dit ches.
Wh en and Wh e re to use it:
• Drainage dips are ge ntly s lopin g exc av ation s running dia go nally acro ss th e ro ad surfac e,
and are appropriate fo r wint er use on unp ave d roa ds and in areas pron e to inund ati on du e
to culvert plugg in g.
• Dra in age dips are mu ch e as ier to t rave rse and re quire less maint enan ce th an waterbar s.
Limitation s and When and Wh ere NOT to use it:
• Limiting factor s include prese nce of shallo w bedroc k and excess ive s lop es (g rea ter th an
15 perce nt):
o A Broad -Base Dip mu st onl y be use d on ro ad s where gradi ent s are 8 percent or
less .
o Rollin g Dip s mu st be use d on roa ds where gradi ents are 15 perce nt or less.
• Dra in age dips should not be use d to handl e li ve (co nstantly runnin g) wa ter.
• Never in stall th e dra in age dip s suc h th at th e di sc harge occ ur s ont o unpro tec ted fill slo pes.
• Dra ina ge dips should not be co nstructed in areas of hi gh speed ve hicl e tra ve l.
Constru cti on Detail and Maintenance Req uirement s:
• In sta ll e nergy di ss ip aters, such as rip rap , or ove r sid e drain s at out fa ll/outl et ends.
• Use grave l to stabil ize th e div ers ion where sign ifi ca nt ve hi cul ar tra ffi c is anti c ip ated.
• Dra in age dip s should be built at an angle of 45 to 60 deg rees fr om th e ro adw ay
cent erlin e.
• T he di vers ion should have a 2 perce nt minimum pos iti ve gra de .
• Fo r dra in age dips th e height fr om c hann el bott om to th e top of th e se ttl ed rid ge shall be
18 in ches and th e sid e slo pes of the ridge shall be 2: 1 or fl att er where prac tic abl e.
• Bl end the berm t o as ge ntl e a slope as po ss ibl e to ease trav elin g .
• Fo ll ow th e dip spac ing g uide below:
o Roa d gra de 2 percent -Spac in g 300 fee t.
o Ro ad gra de 3 perce nt -Spac in g 233 fee t.
o Roa d grad e 4 perce nt -Spac in g 200 fee t.
o Ro ad grad e 5 pe rcent -Spac in g 180 fee t.
o Road gra de 6 pe rcent -Spac in g 167 feet.
o Roa d gra de 8 percent -Spac in g 150 fee t.
o Ro ad gra de 9 percent -Spac in g 144 fee t.
o Roa d gra de 11 pe rc ent -Spac in g 136 feet.
o Roa d gra de 13 pe rce nt -S pa cing 13 1 fee t.
o Road gra de 15 perce nt -S pac ing 12 7 feet.
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• The distance it takes for unrocked, unpro tec ted running surface of a nearby road to
develop a I inch rill is a ro ugh measure of the appropriate spac ing distance.
• Signs alerting motorists to the dip sh o uld be installed in both directions.
• Periodically inspect drainage dips :
o In spect after every heavy rainfa ll for erosion damage.
o Immediately remove sed im ent from the flow area.
o C heck outlet areas a nd make timely repa irs as needed.
Figures:
ROLLING DIP
Rolling Dip
10-15 ft 10-15 ft
Above
. Gr-ade
Reverse Grade
(3 to 8 percent)
Below
Gr-a de
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10 to 25'
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Broad-Base Dip
20ft 20 ft 10to25'
Above Below
Blend
Smoothly
Grade ·
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Skinner Ridge Stom1-Water Management Plan
Piceance Basin Na tura l Gas Development Program
18.0 EROSION CONTROL BLANKETS/MATS
Description: Erosion control blankets/mats are geotextiles or filter fabrics that are used to
stabilize soils, steep slopes and drainage channels .
When and Where to use it:
• In temporary and permanent swales.
• To protect recently seeded slopes.
• In drainageway channels.
Limitations and When and Where NOT to use it:
• Erosion control blankets/mats should not be used in swales with slopes greater than 5
percent or with storm-water velocities > 8 feet per second.
• Erosion control blankets/mats should not be used in areas subject to scour from high
flows (e.g. streambanks) unless designed by an engineer.
• Permits shall be obtained prior to any streambank or shoreline installation of erosion
control blankets/mats, including United States Army Corps of Engineers (USACE) Clean
Water Act (CWA) Section 401/404 permits.
• Blankets/mats manufactured with plastic netting shall be avoided.
Installation and Maintenance Require ments:
• Proper site preparation is essential to ensure complete contact of the protection matting
with the soil:
o Grade and shape area of installation.
o Remove all rocks, clods, vegetative or other obstructions so that the installed
blankets, or mats will have direct contact with the soil.
o Prepare seedbed by loosening 2-3 inches (50-75 mm) of topsoil above final
grade.
o Seed area before blanket installation for erosion control and re-vegetation.
(Seeding after mat installation is often specified for turf reinforcement
application.)
o U-shaped wire staples, metal geotextile stake pins, or triangular wooden stakes
can be used to anchor mats to the ground surface:
• Wire staples should be a minimum of 11 gauge.
• Metal stake pins should be 3116 inch diameter steel with a 1 1/2 inch
steel washer at the head of the pin.
• Wire staples and metal stakes should be driven flush to the soil surface.
• All anchors should be 6-8 inches long and have sufficient ground
penetration to resist pullout.
• Longer anchors may be required for loose soils.
• Begin at the top of the slope and anchor its blanket in a 6 inch deep x 6
inch wide trench.
• Backfill trench and tamp earth firmly.
• Unroll blanket downslope in the direction of the water flow.
• The edges of adjacent parallel rolls must be overlapped 2-3 inches and be
stapled every 3 feet.
• When blankets must be spliced, place blankets end over end (shingle
style) with 6 inch overlap. Staple through overlapped area,
approximately 12 inches apart.
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• Lay blankets loosely a nd maintai n direct contact with the soi l -do not
stre tc h.
• Blankets s hall be s ta pl e d s ufficientl y to anchor blanket a nd mainta in
contact with the soil.
• Staples s ha ll b e pl aced down the cent er and s taggered with the s tapl es
placed along the edges.
• Steep s lop es, I: I to 2 : 1, re quire 2 staples per s qu are yard.
• Moderate s lopes, 2: I to 3 : I, require 1-2 staples per s quare yard (I stapl e
3' on center).
• Gentle slopes require 1 staple per square yard.
• All bl anke ts and m ats should be inspecte d periodi ca lly following in s tallation.
• Inspect installation after s ignificant rainstorms to c heck for erosion and undermining and
for fabric d a mage, loo seness.
• Any failure should be repaired immediately. Re placement of fabric sections m ay a lso be
necessary .
• If washout or breakage occurs, re-install the material after repairing the da mage to the
s lope or drainageway.
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Photographs:
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Piceance Ba sin Natura l Gas Development Program
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19 .0 SLOPE DRAINS
Description: Slope drains are either flexible or rigid pipes that convey concentrated runoff from
the top of a s lope to a sta bl e discharge point at th e bottom of the slope. Slope drain s can be e ith er
temporary or perman ent depending on the method of in sta ll ation and materi al used.
When and Wh ere to use it:
• At the to p of c ut-and -fill slop es to convey stor m-wa ter down the slope .
• Before a s lope ha s been stabili ze d or before permanent draina ge structures are ready fo r
use .
• In co mbin ation with oth er BMPs th at have bee n use d to co nce ntrat e flow s, including
temporary swa les.
Limitation s and Wh en and Where NOT to use it:
• Slop e drains s hould not be used for dra ina ge areas larger th an 5 ac res.
• Physical obstructions sub stanti a ll y reduce th e effective ness of the drain .
• Other co nce rn s are failures from overtop pin g because of inad equa te pip e inl et capac ity ,
and reduced diversion chann el ca pacity and ridge height.
Cons tru ction Detail and Maintenance Require ment s:
• The drain should cons ist of heavy-duty mat erial manufa ctured for th e purp ose and have
grommets for anchoring at a spac in g of I 0 fee t or less.
• Minimum slope drain diameters should be obse rved fo r varyi ng drainage areas.
• The entrance to th e pipe should co ns ist of a sta ndard flared section of corrugated meta l:
o The corru ga ted metal pipe shou ld have wa terti ght joints at th e end s.
o The re st of the pip e is typ ica ll y corrugated plastic or fl ex ibl e tubin g, although for
flatter, shorter slopes, a polyethylene -lin ed chann el is so metimes use d.
• The he ight of the diver sion at the pipe should be the diameter of the pipe plus 0.5 foo t.
• T he ou tl et should be locate d at a reinforced or eros ion-resistant loca tion .
• Slope drains should be inspected after eac h rainfall to determi ne if capacity was excee ded
or if blockages occ urred.
• Repa ir s should be made prom pt ly .
• Const ru ct ion eq uipm ent and ve hi cu lar traffic mu st be rero ut ed arou nd slope drains.
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Photograph and Figure:
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I ·-,
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20.0 SLOPE STABILIZATION
Description: Slope stabili za tion generally pertains to stru ctures or other BMPs that stabilize
s lopes that ca nnot be stabilized with vegetation. The se st ructure s and BMPs may in clud e gabion s
and retaining walls (also see Retaining Wa ll BMP). Som e of the se stru ctures and BMPs are al so
use d to stabili ze strea m bank s.
• Gabions are rec tan gu lar wire-me sh cages that are filled with rock and wired together to
form a protective but permea bl e structure for slop e stabili za ti on and erosion control.
• Gabi ons can be use d as retaining walls to mec hanically stabilize steep s lop es, or for
revet ment s, weirs, c hannel linin gs, cul ve rt headwalls , and culve rt outlet apron s. Th ey are
partic ularly usefu l where see page is anticipated .
When and Where to us e it:
• Slope stabili za tion stru ct ures or other BMPs should be in stall ed prior to or imm ediat ely
after di sturbing erodible so il s.
• Slope stabilizati on should be appli ed in areas wh ere th ere is ac ti ve or fore seea ble ero sion
of th e soils adja ce nt to a wat erco ur se or wetland , and/or on steep slop es.
• Note that the construction and in stallation of these structures s hould not re sult in
encroach ment int o the watercourse or wetland .
• Th e type of slop e stabili zation method use d will vary de pendin g upon the soil s, s lop e of
th e land, groundwater chara cteri sti cs, and th e climati c conditions of the area.
• Th e ir use is very important in areas where there are steep s lop es, highly erodible soi ls,
and where conditions ca n s ignifi ca ntl y increase or create ero s ion (i.e. ar eas of fla sh
fl oo ds, strong wind s and lake shore lin es).
• Spec ia l consid erat ion should be give n to th e de s ign and use of stru ctures that will be
suscepti bl e to the force s of ice mov e ment. Ice ac ti on has been sho wn to weaken,
di slo cate, and des troy improp erly des igned and in stall ed stru ctures.
Limitations and When and Where NOT to use it:
Slope stabili za tion should not be use d where other BMPs that achi eve stabilization with
vegeta ti on, suc h as mulching, ca n be app li ed effectively.
Co nstruction Detail and Mainte nance Requirements:
• Gab ions:
o Co nstru cti on plan s and spec ifi cat ions should be prepared by pro fess ionals
familiar with the use of gabions.
o Th e stru ctur e mu st be abl e to handle ex pected storm and flood co ndition s.
o On streambank appli cations, the foundation is an imp ort ant des ign featur e of the
stru cture. Cons id er the potential for th e stream to erode th e sid es and bottom of
the chann el and make sure th e ga bion s will be supp or ted properly .
o Th e ga bi on structure mu st be sec urely "keyed" into th e foundation and ab utm en t
surfac es. Th e rock fillin g hold s th e gab ions in plac e by grav ity, but ti e-ba cks may
be use d if cond iti ons warrant additional stru ctural stre ngth.
o Gabions are usuall y placed on a filt er blanket (grav e l la ye r of filt er cloth ) or both .
o Gabion s should be fabricated in such a manner th at the s ides, end s, lid s, and
diaphra gms can be asse mbl ed at th e cons tru ction sit e into a rectangular basket of
requir ed sizes.
o Gabion s shou ld be of s in gle unit co nstru cti on --th e base, end s, and sid es should
e ither be wove n into a s in gle 110jt or on e e dge of th ese memb ers connected to th
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base section of the gabion in such a manner that strength and flexibility at the
point of connection is at least equal to that of the mesh.
o Where the length of the gabion exceeds its horizontal width, the gabion should be
equally divided by diaphragms, of the same mesh and gage as the body of the
gabions, into cells whose length does not exceed the horizontal width.
o The gabion should be furnished with the necessary diaphragms secured in proper
position on the base section in such a manner that no additional tying at this
juncture will be necessary.
o All perimeter edges should be securely selvedged or bound so that the joints
formed by tying the selvedges have the same strength as the body of the mesh.
o The fill material for the wire gabions should be rock ranging in size from a
minimum of 4 inches to a maximum of 8 inches, both measured in the greatest
dimension. Rock should be sound, durable, and well graded.
• All slope stabilization structures and other BMPs should be free of sharp edges and
protruding metals.
• All structures require a site visit to determine the appropriate structure. During a site
visit:
o Determine the soil texture and its inherent stability.
o Determine the normal and storm surge water elevations.
o Measure the length and (where appropriate) height of the area.
o Consider the elevation of the proposed location for the new structure in
comparison to the elevation of the existing shoreline.
• Areas up-slope of these structures and other BMPs should be stabilized with vegetation
by revegetation (seeding/sodding) and mulching (also see Revegetation and Mulching
BMPs).
• In some instances, diversions can be used to divert water away from these structures
while they are being developed.
• Geotextile Filters are often used under these structures to filter sediment.
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21.0 MULC HING
Desc ripti on: Mulchin g is use d to temp ora rily stabili ze so il s by sec ure ly applying materi als such
as grass , hay, woodchips or wood fib ers to the soil's surfa ce. Mulching protect s th e so il from
ra indrop impact and redu ces th e velocity of overland run off. Mul ch also aids in th e grow th of
te mporary seedin g by holdin g see ds and top soil in pla ce, reta inin g moi sture, and in sul atin g
agai nst extreme te mperatures.
Wh en and Where to us e it:
• On stee p slopes a nd critical areas such as waterways, mul c h matting is used with nettin g
or anchoring to hold it in place.
• Mul ches can be use d on see ded and planted area s where s lop es are steeper than 2: I or
wh ere se nsitive seedlings require in sulation from ex treme temp era tures or moisture
retenti on.
• All di sturbed areas and stoc kpil es shall be mulch ed within 2 1 day s after final grade is
reac hed.
• Di sturb ed areas and stockpil es which are not at final grade but will remain dormant for
lon ge r than 30 day s s hall also be mulched within 21 days after interim grading.
• An area th at is go in g to remain in an interim state fo r more th an 60 day s shall a lso be
seeded .
• Mulchin g is a lways to be use d whe n applying temporary or permanent see din g.
• Mul chin g is often use d when temporary seedin g cannot be use d du e to th e seaso n or
climate .
Limitati ons and Wh en and Wh ere NOT to use it:
• Mul ching is not a preferred BMP in areas that will invol ve pav in g, building, or utility
co nstru ction within 2 1 days after final grade is reac hed.
• Mul chin g, mattin g, and nettin g mi ght de lay see d ge rmin ation beca use th e cove r changes
so il s urfa ce temp e ratures .
• The mul ches th e mse lve s are s ubj ec t to erosion and ma y be was hed away in a large storm .
• Maintenanc e is necessa ry to ensure that mulch es provide effec tiv e erosion co ntrol.
Application Tec hniqu es a nd Maint enan ce Requ irement s:
• Whe n poss ibl e, organic mulch es should be use d for eros ion co ntrol and pl ant mat erial
es ta bl ishm ent.
• Suggested mater ial s includ e loo se straw, nettin g, wood ce llulo se, or agricult ura l silage.
• All mater ials should be free of see d, and loose hay or stra w should be anchored by
appl ying tac kifi er, stapling nettin g over the top , or crimping with a mul ch crimpin g tool.
• Mat er ial s that are heavy enough to stay in pla ce (for exa mpl e, grave l or bark or woo d
chips on fl at s lop es) do not nee d anchoring .
• Oth er exa mple s includ e hydrauli c mulch produ cts wi th JOO-p erce nt po st-co nsum er pape r
content, ya rd trimmin g co mpo sts, and wood mul c h from re cyc led stumps and tree part s.
• Inorga ni c mulch es suc h as pea grave l or cru shed gra nit e ca n be used in unv ege tat ed
areas.
• Mulch es may or may not require a bind er, nettin g, or tackin g.
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• Effec ti ve use of netti ng and mattin g mat erial requires fi rm, conti nuous co ntac t betwee n
the mat erial s and th e so il. If th ere is no cont ac t , th e mat erial wi ll not ho ld the so il and
erosion will occur und ernea th th e mat eri al.
• Grading is not necessary befo re mulching .
• There mu st be adequate coverage to preve nt eros ion, wa s hout, and po or plant
es tabli shm ent.
• If an appropriate tac kin g agent is not ap pli ed, or is app li e d in in suffici ent amoun ts, mul ch
may be lost to wind and run off.
• Th e channel grade and liner mu st be appropriate for the amount of run off, or res ultin g
eros ion will occur in th e channe l bott om.
• Hydromulch should be applied in sprin g, summer, or fall to preve nt dete ri oration of
mulch before plants ca n beco me es tab li shed.
• Guidelines for in sta ll ing mulch es, typical mulching materials, and ap pli ca ti on ra tes are as
fo ll ows:
o Straw:
• Rat e per Ac re: 1-2 Ton s.
• Re quirem ent s: Dry , unchopped , unw eathered; avo id weeds.
• Notes : Sp read by han d or mac hin e; mu s t be tac ked or ti ed do wn.
o Wood Fib er or Wood Ce llu lo se:
• Rate per Acre: Y2 -l ton.
• Notes: Use with hydro see der; may be used to ta ck straw . Do not use in
hot, dry wea th er .
o Wood Chip s:
• Rate per Acre: 5 -6 tons.
• Require ment s: Air dry . Add fe rtili ze r, 12 lb/t on.
• Not es: Apply with blow er, chip handl er, or by hand. Not fo r fine turf
areas .
o Bark:
• Rate pe r Ac re: 35 cubi c yard .
• Require ment s: A ir dry, shredd ed, or hamm erm ill ed, or chip s.
• Notes: App ly with mul ch blow er, c hip handl er, or by hand . Do not use
as pha lt ta ck.
o Nets and Mat s:
• Rate pe r Ac re: Jut e net.
• Require ment s: Cover area .
• Notes : Hea vy , uni fo rm ; wov en of s in gle jute ya rn . Use d with orga ni c
mulch. With stands water flo w.
o Excelsior (Woo d F ib er) Mat:
• Rate per Acre: Cove r area.
o F ib erg lass Ro vin g:
• Rate per Acre: Y2 -l ton .
• Require ment s: Con tinu ous fib ers of drawn gla ss bound together with a
non-tox ic agen t.
• Not es: Apply with co mpressed air ej ec t or. Tack wit h em ul s ified aspha lt
at a rate of 25 -35 ga ll ons/1000 foot.
• Mu lc hed areas shoul d be in spec te d freq uently to id enti fy areas whe re mul ch has lo osened
or bee n re moved , es pec ially afte r rai nstorm s.
• Su ch areas shou ld be resee ded (if necessa ry) and th e mulch cove r rep laced imm edi ate ly.
• Mul ch bind ers should be ap pli ed at rates reco mmend ed by the manu fact ur er.
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) • If washout, breakage, or erosion occurs, s urfaces should be re paired, reseeded, a nd
remulch e d, and new netting s hould be in stalled .
• Inspections should be continued until vege tation is firmly establi shed .
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22.0 CULVERTS
Description: Culverts consist of concrete or metal pipe or structures (box culverts) that are
installed to conduct intermittent or cons tant flow around obstacles or under roadways or other
related infrastructure (utilities such as pipelines, electrical lines, water, sewer, etc.).
When and Where to use it:
• To conduct flow around obstacles or under roadways or other related infrastructure.
• Can be used to handle intermittent or constant, manmade or natural flows .
Limitations and When and Where NOT to use it:
For temporary culvert crossings, pipe class/size, and minimum cover, etc . should be sized to
ensure that the culverts will convey the flow of the watercourse and bear the loads associated with
the type of vehicles that may use the crossing .
Construction Detail and Maintenance Requirements:
• Confirm that all related stream permitting is obtained prior to installing temporary stream
cros sings and that all work will be in compliance with such permitting -including
USACE CWA Section 401/404 permitting requirements.
• Ford stream crossings should be lined with filter fabric and then layered with a minimum
6-inch layer of I Yi'' inch diameter rock.
• Sediment accumulated upstream of stream crossings should be removed when the
sediment depth is within 6-inches of the crest (ford crossing) or greater than an average
depth of 12-inches (culvert crossing).
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23.0 CUL VERT INLET AND OUTLET PROTECTION
Description: Protective meas ure BMPs installed to prevent erosion, scour, and undercutting at
culvert inlet and outlets.
When and Where to use it:
• At culvert installation inlets and outlets.
• Typically consists of other BMPs installed in conjunction with typical culverts, in
particular riprap.
Limitations and When and Where NOT to use it:
None.
Construction Detail and Maintenance Requirements:
• Confirm that all related stream permitting is obtained prior to installing temporary s tream
crossings and that all work will be in compliance with such permitting -including
USA CE CW A Section 4011404 permitting requirements.
• Use of recycled concrete is not an acceptable substitute for rock.
• Sediment accumulated upstream of stream crossings should be removed when the
sediment de pth is within 6-inches of the crest (ford crossing) or greater than an average
d e pth of 12-inches (culvert crossing).
Photographs and Figures:
See pictures and figures for riprap.
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24.0 R EVEGETATION
Desc ription : Re vegetation typically co ns ists of planting plant s or applying a mixtur e of fib er,
see d, and fertili ze r that protec t ex posed so il s from erosion by water and wind. Revegetation
should be conducted as quickl y as po ss ibl e in areas where work ha s been co mpl eted or when
th ere will be no work for an ex tend ed pe ri od of tim e. Site pl annin g and pha s ing s hould include
meas ures to ensure that di sturb ed areas are revegetated within fourteen (14) calendar days after
final gradin g, ea rth di sturban ce activities ha ve bee n com pl eted or when work is suspended for
longer th an thirty (30) day s. Revegetated areas should be protected with crimped stra w mulch, or
eros ion control blankets.
Wh en and Wh ere to use it:
• Planting or appli cation of seed for permanent revege tation and sta bili zation of di sturbed
soils.
• Temp ora ry prot ec ti on of di sturb ed areas until perm anent meas ures (e.g., vegetation) are
in sta ll ed .
• Temporary protec tion of di sturbed areas that mu st be re-di sturb ed following an ex tend ed
period of inactivity.
Limitation s and When and Where NOT to use it:
• Straw mulchin g may be necessa ry in addition to revegetation in order to properly
estab li sh vegetation.
• Steep slop es may be difficult to protect and es tabli sh with revegetation.
• Dry or co ld weath er will affect revegetation es tab li shm ent.
Co nstru cti on Detail and Maintenance Req uire me nt s:
• S it e co ndition s mu st be evaluated prior to determinin g suitabl e spec ies se lec ti on and
application rate s.
• Attributes such as so il types , topograp hy, loca l clim ate and se ason, ma inte nance
req uirement s, prox imit y of sens iti ve areas (e.g., liv e streams), and ex isting nati ve
vegeta ti on types shou ld be cons idered.
• All plant s and see ds to be use d shall be in co nfo rmance with requireme nts of th e proj ec t
spec ifi ca ti ons.
• Reve ge tation should on ly be condu cted aft er appropriate see dbed and so il prepara ti ons
have bee n mad e to ensure th e so il is condu cive to plant growt h.
• Thi s may include soi l amendm e nt s and/or gra din g an d tillin g.
• Revegetate d areas shall be cove red with crimp ed stra w mulch or erosion co ntrol bl anket s
t o protect plant s and th e seed bed and fac ilit ate root grow th and ger min at ion.
• Revegetated areas shall be in spe cted to verify ge rmin at ion, vege tat ive growt h, and
ad equ ate ground cove r.
• Revegetated areas that fail to estab li sh or are di sturbed should be re-plant ed or see ded as
appropri ate.
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25.0 TURNOUTS
Description: Water turnouts can be a ditch, trench, or other conveyance used to divert storm-
water runoff away from a road surface or adjacent ditch. The turnout, which can be th e width of a
backhoe bucket or a bulldo ze r blade , carrie s water into undi sturb ed areas of vegetation to both
di ss ipate energy and disperse water flow to the forest floor.
When and Where to use it:
• The use of water turnouts is often dependent on gradient of the property and availability
of suitable outlets.
• Water turnouts shou ld be spaced at a di stance to provide good road drainag e thu s
avoiding water pooling which ca n lea d to soi l compaction, soup ing, or rutting.
• A water turnout can hav e a secondary application of functioning as a minor se diment
trap , therefore , mainte nanc e is imp orta nt to ensure the turnout is neither subj ec t to
erosion itse lf from excess ive runoff e vents or se dimentation to the point of becoming
nonfunctional .
• Mo st importantly, water turnout s must not empty directly into streams or other water
channels (i.e., drainag e ways , ditches, channali ze d streams, etc.) leading directly to
streams and other waters.
Limitation s and When and Wh e re NOT to use it:
None.
Co nstructi on Detail and Mainte nance Requirement s:
• Wate r turnouts should int ersec t a dit ch lin e at th e sa me depth and be outsloped 1-3
perce nt.
• On slop in g road s, turnout s should be 30-45 deg rees downslop e ..
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26.0 STABILIZED ENTRANCE/EXIT
Description : A temporary stabilized vehicular entrance should be es tabli shed at all points where
traffic will enter and exit the site . A stabili ze d construction entrance/exi t reduc es or eliminate s
th e trackin g o f sediment onto public ri ght-of-wa y, str ee ts, or parking areas where it ca n be
wa shed int o loca l stream s or become airborn e polluti on du e to wind affec ts.
Wh en and Wh ere to use it:
• Whereve r traffi c will be entering or leaving a co nstruction s ite.
• Entrances should be co nstruct ed on leve l ground .
• Sit e s pecific, condit ions will dictate need .
Limitation s and When and Wh ere NOT to use it:
• Entranc es mu st be pl anned and review ed as part of th e proj ec t traffi c control plan.
• Some soil may still be deposited from vehicle tires onto paved surfa ces and require
sub seq uent cl ea nup .
• To further redu ce the chance of the se se dim ent s polluting storm water runoff, swee ping
of th e paved area adjacent to th e stabilized sit e ent ra nc e is recommended.
Construction Detail and Maintenance Requirement s:
• Entran ces mu st be properly graded to prevent runoff from leav in g th e s it e.
• Entranc es should drain to a sed im ent trap or se dim ent bas in .
• Des ign stabilized ent ra nce/exit to su pport th e heav ies t vehicl es and equipment th at wi ll
use it.
• Pl ace agg rega te ove r geo tex til e fabric to prevent se dim ent from th e base materi al from
mi grating into th e agg regate.
• Agg reg ate should be angular, fractured rock .
• Agg regat e should be 12 in ches dee p, 3 to 6 in ches in s ize and 50 fe et long.
• Grave l mat shall be re pl aced by top dre ss in g with add iti onal stone when surfac e vo id s are
no longer visible .
• All se dim ent depos ited on paved roadways mu st be re moved within 24 hour s.
• The grave l and filt er fabric mu st be re mo ved upon comp let ion of th e co nstruct ion and
di sturbed so il areas res ultin g from remova l sha ll be permanently stabili zed.
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Photogra ph :
stab i Ii zed c oh stru cti 0 n'· entra n ces :an 0 w .. d irt to
" -:-,... t .,• • .. .. .
b.e removed ·:from ·tire.rtreads . and collected ~as ..
'tru CkS leave. 'CO n stru Cti on site S ,.. .. ..
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27 .0 RETAINING WALLS
Desc ripti on: Retaining wall s are con structed again st a s lope or strea m bank to preve nt slope
ero sion or s lo pe failure, or unde rcuttin g of streambank s. Retaining wall may be constru cted of
concrete , co ncrete ma so nry, roc k, wo od pl ankin g or railro ad ti es, and metal bin s .
Wh en and Wh e re to use it:
For slop e prot ec ti on or sta bili za tion und er ex tre me co nditi ons or to protect erodibl e, un stable
strea m banks.
Limitation s and Wh en and Wh ere NOT to use it:
• Retaining wall s should be con s id ered a perm ane nt measure onl y. Cost and s it e-s pec ifi c
des ign requirement s limit thei r use to situ ations where other stabili zation meas ur es would
be ine ffec tive.
• Nati ve rock reta inin g wa ll s have a max imum height of about 6.5 feet.
• Redw oo d retainin g wa ll s require a firm found ati on to an chor the wa ll.
• Woo d trea ted with creosote or oth er che mi cals to re tard decay may leac h out and cau se
tox ic effect s. Treated railroad ti es should not be use d along sensitiv e strea ms for in stan ce.
Co nstru cti on Detail and Maintenanc e Re quirement s:
• Retaining wall s require a site-spec ifi c design.
• Wa ll he ight s , requirement s fo r dra in age, and suit a bl e mat eri als mu st be determin ed
th ro ugh on-s it e in specti ons.
• A ll types of retainin g wall s sho uld co nform to local buildin g co des and ordin ances.
• Pl ans and spec ifi cati ons should be prepared by profes sional engin eers for most
in stall ati ons.
• Retainin g wall s mu st be in specte d peri odi call y on regul ar int erval s to detec t s igns of
stru ctura l fa ilu re, and to c hec k fo r damage cau sed by sub surface drainage or materi al
s lo ughin g.
• In stream bank in stall ati ons shoul d be in s pec ted fo r s igns of und ercuttin g and oth er
in stability.
• All re pa irs should be made pro mptl y, as needed.
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28.0 CONCRETE WASHOUT FACILITIES
Description: Concrete washout facilities are used to prevent or reduce the discharge of pollutants
to storm-water from concrete waste by conducting washout offsite , performing onsite washout in
a designated area, and training emp lo yee and subcontractors.
When and Where to use it:
• Concrete washout faciliti es are used on construction projects where:
o Concrete is used as a construction material or where concrete dust and debris
result form demolition activitie s.
o Slurries containing portland cement concrete or aspha lt concrete are generated,
such as from saw cutting, coring, grinding, grooving, and hydro-concrete
demolition.
o Concrete trucks and other concrete-coated equipment are washed ons it e.
o Mortar-mixing stat ion s exist.
Limitations and When and Where NOT to use it:
Offsite washout of concrete wastes may not alway s be possible.
Construction Detail and Maintenance Requirements:
• Discuss the concrete management techniques de sc ribed in this BMP (such as handlin g of
concrete waste and washout) with the ready-mix concrete supplier before any deliveries
are made.
• Incorporate requirements for concrete waste management into material supp li er and
subcont ractor agreements.
• Do not all ow excess concrete to be dumped onsite, except in designated areas .
• For onsite washout:
o Locate washout area at least 50 feet from storm drains , open ditches, or water
bodies.
o A void creating runoff by draining water to a bermed or level area when washing
concrete to remove fine particles and expose the aggregate.
o Post a sign adj acent to each washout facil ity to inform concrete equipment
operators to utilize the proper faci liti es.
o Do not allow runoff from this area by constructing a temporary pit or bermed
area large enough for liquid and solid waste.
o Only concrete from mixer truck chutes shou ld be washed into concrete wash out.
o Once concrete waste s are washed into the designated area and allo wed to harden,
the concrete shou ld be broken up, removed, and disposed of.
• Education:
o Educate employees, subcontractors, and suppliers on the concrete waste
management techniques described herein.
o Arrange for contractor's superintendent or representative to oversee and enforce
concrete waste management procedures.
• Inspection and Maintenance:
o Inspect and verify that activity-based BMPs are in place prior to the
commencemen t of associated activities.
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o While activities associated with the BMP are under way, inspect weekly during
the rainy season and on two-week intervals in the non-rainy season to verify
continued BMP implementation.
o Temporary concrete washout facilities should be maintained to provide adequate
holding capacity with a minimum freeboard of 4 inches for above grade facilities
and 12 inches for below grade facilities.
o Maintaining temporary concrete washout facilities should include removing and
disposing of hardened concrete and returning the facilities to a functional
condition.
o Hardened concrete materials should be removed and disposed of.
o Washout facilities must be cleaned, or new facilities must be constructed and
ready for use once the washout is 75 percent full.
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29.0 SANITARY/SEPTIC (PORT-0-LET) WASTE MANAGE MENT
Desc ription : Proper sa nit ary and se pti c wa ste mana ge ment preve nt s th e di sc harge of pollut ant s to
storm-water from sa nitary and se ptic waste by providin g co nveni ent , well-maintained facilities,
and arranging for reg ul ar service and di sposa l.
Wh en and Wh ere to use it:
Sanitary se pti c wa ste manageme nt pra cti ces are suit abl e fo r use at all co nstruction s it es that use
te mporary or portabl e sa nitary and septic was te sys tems .
Limitation s and When and Wh e re NOT to use it:
None.
Co nstruction Detail and Maintenance Req uirement s:
• Sanitary or se pti c wastes should be treated or di spose d of in acco rdanc e with state and
local requirement s. In many cases, one co ntra ct with a lo ca l facility suppli er wi ll be all
that it takes to make sure sa nit ary wastes are properly disp osed.
• Storage and Di spo sa l Procedures:
o Temporary sa nitary facilities should be loca ted away fr om draina ge facilities,
watercourses, and from traffi c circul ati on.
o Temporary sa nitary fa c iliti es sho uld be sec ured to preven t overturning due to
hi gh winds or ri sk of hi gh winds.
o Only reput abl e, license d sa nit ary and se pt ic wa ste haul e rs should be use d.
o Sanitary fac iliti es should be located in a conveni ent loca ti on.
o Untre ated raw was tewa ter sho uld never be di sc harge d or buri ed.
o Reg ular wa ste co ll ec ti on by a lic ense d haul e r should be arranged before fac ilities
ove rfl ow.
• Edu ca ti on:
o Educate emp lo yees, subco ntra ctors, an d suppliers on sa nitary and se ptic was te
storage and di sposa l procedures.
o Edu ca te em pl oyees, subcontractors, and s uppli ers of potential dangers to hum ans
and the environm en t from sa nitar y and se ptic was tes.
o In struct empl oyees, sub co ntracto rs, and suppli ers in iden tifi ca ti on of sa nit ary and
sep ti c wast e.
o Hold reg ul ar meeti ngs to di sc uss and re in fo rce di spo sal procedures (in corporate
into regul ar sa fety meetin gs).
o Es tabli sh a co ntinuing educa tion program to indoctrinate new emp loyees .
• In spection and Maintenance:
o In spec t and veri fy th at act ivi ty-based BMPs are in place prior to th e
co mme nce ment of asso c iat ed ac ti viti es.
o Whil e activities assoc iated with th e BMP are und er way, inspect week ly durin g
the rainy seaso n and on two-week int erva ls in the non-rainy seaso n to verify
continued BMP impl eme nt at ion.
o Arrange for regular waste co ll ectio n.
o If hi gh wind s are ex pec ted, porta bl e san itary fac iliti es must be secured with
spikes or weighed dow n to prevent over turnin g.
Doc. No.: PBSR -ALL-RGL-PMT-URS -00000-00002 -00 , Rev. F
Chevron North Am erica n Ex pl oration and Produ ct ion Company 6 1
Skinn er Ridge Storm-Water Managemen t Plan
Pi cea nce Ba sin Nat ura l Ga s Deve lopment Program
Photograph and Figure:
1' x 1'
Doc . No .: PBSR-ALL-RGL-PMT-URS -00000-00002 -00, Rev . F
Chevron North American Exp loration and Production Compan y 62
CONTAINMENT
EARTHEN BERM
OR SAND BAGS
GRAVEL PAD
Skinner Ridge Stom1-Water Management Plan
Piceance Basin Natural Gas Development Program
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30.0 INLET PROTECTION
Description: Inlet protection is a sediment control barri e r formed around a storm drain inlet. A
number of alternative inlet protection designs are available, including:
• Silt fence inlet protection.
• Straw bale barrier inl e t protection.
• Block and gravel bag inlet protection.
• Curb socks and sandbag inlet protection.
When and Whe re to us e it:
Application of inlet protection differs by d esign, as follows:
• Filter fabric and straw bale inlet protection are used for area inlets (not located within
streets).
• Block and gravel bag curb inlet protection is used for street inlets in s umps.
• Curb sock protection is used for street inlets in s umps or on continuous grade.
Limitations and When and Where NOT to use it:
• Filter fabric and straw bale inlet protection cannot be used for drain inlets that are paved
because these de sign s require excavation and/or staking of materials.
• Block and gravel bag inlet protection is not recommended for continuous grade inlets due
to concerns about damage from bypassed flow .
Construction De tail and Maintenance Require ments:
• These controls s hould be installed befo re any so il disturbance in the drainage area.
• Fabric inl et protection should be st a ke d close to the inlet to prevent overflow on
unprotecte d soils.
• For sandbags :
o Sandbags shall be filled with 3/4 inch drain rock or 1/4 inch pea gravel.
o Several laye rs of bags should be overlapped and packed tightly.
o Leave a one-s andbag gap in the top row to act as a s pillway.
• In spect and clean barriers during and after each s ignificant storm and re mov e sediment
from behind structures after every storm.
• Any sediment and gravel shall be immediately removed from the traveled way of roads.
• The removed sediment shall be placed where it cannot enter a s torm drain, s tream, or be
transported off site.
• If th e gravel becomes clogged with sediment, it must be carefully removed from the inl e t
and e ither cl eared or replaced.
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Chevron North Ameri ca n Exp lorat ion and Production Company 63
Skinner Rid ge Stom1-Water Management Plan
Piceance Basin Natural Gas Developm ent Program
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Chevron North American Explorati on and Production Company 64
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Piceance Basin Natural Gas Development Program
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C hevron North American Exploration and Production Company 65
Skinner Ridge Storm-Water Management Plan
Pi ceance Bas in Natural Gas Development Program
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C hevron North American Exploration and Production Comp any 66
Skinner Ridge Stonn-Water Management Plan
Piceance Basin Natural Gas Development Program
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Ch evron North Ameri can Exploration and Production Company 67
Skinner Ridge Stom1-Water Management Plan
Piceance Basin Natural Gas Developm ent Program
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Chevron No1th American Ex ploration and Production Compan y 68
Sk inner Ridge Storm-Water Management Plan
Piceance Bas in Natural Gas Developm ent Program
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Ch evron North American Exploratio n and Production Company 69
Skinner Ridge Stom1 -Water Management P lan
Piceance Bas in Natural Gas Development Program
31.0 TEMPORARY SEDIMENT BASINS
Description: A temporary sediment basin detains sediment-laden runoff long enough to allow
much of the sediment to settle out. Sediment basins are constructed by excavation and/or by
placing an earthen embankment across a low area or drainage swale. Basins can be designed to
maintain a permanent pool or to drain completely dry through a controlled outlet structure.
When and Where to use it:
• Required in disturbed areas draining more than one acre.
• Where there is sufficient space and appropriate topography.
• In areas that allow access for maintenance and sediment removal.
• Positioned so that it captures sediment from the entire upstream disturbed area.
• Where a permanent detention basin is planned for the site.
Limitations and When and Where NOT to use it:
Sediment basins are not to be installed in active streams.
Construction Detail and Maintenance Requirements:
• Potential sites for sediment basins should be investigated during the initial site
evaluation.
• Basins should be constructed before any grading takes place within the drainage area.
• For structures that will be permanent, the design of the basin should be completed by a
qualified professional engineer experienced in the design of dams.
• Sediment basins with rock dams should be limited to a drainage area of 50 acres.
• Rock dam height should be limited to 8 feet with a minimum top width of 5 feet.
• Side slopes for rock dams should be no steeper than 2: I on the basin side of the structure
and 3: 1 on the outlet side.
• The basin side of the rock dam should be covered with fine gravel from top to bottom for
a minimum of I foot to slow the drainage rate from the pool that forms and allow time for
sediments to settle.
• The detention time should be at least 8 hours.
• Sediment basins with earthen embankments should be outfitted with a dewatering pipe
and riser set just above the sediment removal cutoff level.
• The riser pipe should be located at the deepest point of the basin and extend no farther
than I foot below the level of the earthen dam.
• A water-permeable cover should be placed over the primary dewatering riser pipe to
prevent trash and debris from entering and clogging the spillway.
• To provide an additional path for water to enter the primary spillway, secondary
dewatering holes can be drilled near the base of the riser pipe, provided the holes are
protected with gravel to prevent sediment from entering the spillway piping.
• In all cases, such structures should be designed by an appropriate professional based on
local hydrologic, hydraulic, topographic, and sediment conditions.
• Routine inspection and maintenance of sediment basins is essential to their continued
effectiveness.
• Basins should be inspected after each storm event to ensure proper drainage from the
collection pool to determine the need for structural repairs.
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Chevron North American Exploration and Production Company 70
Skinner Ridge Storm-Water Management Plan
Piceance Basin Natural Gas Development Program
• Erosion from the earthen embankment or stones moved from rock dams should be
) replaced immediately.
)
• Sediment basins must be located in an area that is easily accessible to maintenance crews
for removal of accumulated sediment.
• Sediment should be removed from the basin when its storage capacity has reached
approximately 50 percent.
• Trash and debris from around dewatering devices should be removed promptly after
rainfall events.
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Chevron No11h American Exploration and Production Company 71
Skinner Ridge Stom1-Water Management Plan
Pi cea nce Basin Natural Gas Development Program
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Aopendix B -Down-Hole Chemical List -Frac Operations
lex
Halliburton
Halliburton
Halliburton
Halliburton
Halliburton
etroleum distallate Halliburton
Halliburton
Halliburton
Biocide Halliburton
Stormwater Insl!ection Form {Light/Heavl'. Industrl'.)
Colorado Stonnwater Program (WQCD-B2-PE)
Phone (303) 692-3575 Fax (303) 782-0390
Email: cdpheWQStonn@cdphe.state.co.us .
General Information
Name of facility: CDPS#: CO -------
Facility Information
City: County: Address/Directions:
Name(s) ofOnsite Representative(s): nhone: ( )
Permittee (If not 2ermitted, Owner or 02erator)
Company Name: Name of Responsible Official:
Title of Responsible Official: ohone: ( )
Address:
Inspector( s): Persons present:
Inspecting Agency:
Date conducted: _/_/_ Pictures Taken? Yes No
Records
Copy of SWMP confirmed on site? Yes No
SWMP Review:
I. Industrial activity description as required in the permit? Yes No
Notes:
2. Site map as required in the permit? Yes No
Notes:
3. Stormwater Management Controls:
a. SWMP administrator as required in the permit? Yes No
Notes:
b. Identifying potential pollutant sources and BMPs? Yes No
Notes:
c. Sampling information as required in the permit? Yes No
Notes:
d. Preventive maintenance as required in the permit? Yes No
Notes:
e. Good housekeeping as required in the permit? Yes No
Notes:
f. Spill prevention and response procedures as required in the permit? Yes No
Notes:
g. Employee training as required in the permit? Yes No
Notes:
h. Identifications of discharges other than stormwater as required in the pe1mit? Yes No
Notes:
4. Comprehensive inspections as required in the permit Yes No
Notes:
5. Consistency with other plans as required in the permit Yes No
Notes:
Inspection records kept? Yes No
Inspections conducted as required in the permit? Yes No
Notes:
Stormwater Inspection Form (Light/Heavy Industry) Page2
Site In spection )
BMPs implement ed for stonnwater diversion around potential pollution sources? Yes No
Notes:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BMPs implemented for materials handling, sp ill prevention, an d s pill cleanup? Yes No
Notes:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BMPs implemented for sediment and erosion prevention? Yes No
No tes:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BMPs impl emented for good housek eeping? Yes No
Notes:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BMPs implemented for inspection and maintenance of stonnwater management devices? Yes No
Notes:~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BMPs implemente d for training all emp lo yees on st onnwater management? Yes No
Notes:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Eviden ce of offs ite transport of sediment or other pollutants? Ye s No
Notes:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Ev idence of offs ite transport of se diment or o th er pollutants reaching state waters? Yes No
Notes :~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Evidence of di scharges other than s tonnwater? Yes No )
Note s:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Site-Specific Storm-Water I Soil Management Plan Page 1/5
Site Name: Central Production Facility!Temporary
Storage Area Date of Plan: June 26, 2008 , Rev. 1
J r--~~~~~~~~~~~~~~~~~~~~~~-.
j 1. Site Activity I Description
Background Information: Information provided in this
document is intended to supplement the existing Skinner
Ridge Storm Water Management Plan. This document
specifically addresses the requirements for the Central
Production Facility.
Site Purpose: A 50 MMscf compression I drying facility
known as the Central Production Facility (CPF) will be
constructed in stages near the confluence of Tom Creek
and Clear Creek in Garfield County, CO. The CPF
purpose is to dry and compress raw natural gas coming
from the well field for delivery to regional pipelines . CPF
operat ions will include transfer I compression of natural
gas, removal I storage I transfer of produced water
(water entrained in the raw gas stream), and removal I
storage of condensate (mixture of low-density
hydrocarbons entrained in the raw gas stream), and
emission control. The facility is equipped with all the
required safety and control systems . A flare stack will be
installed along the eastern edge of the facility for start up
operations and to handle any possible system upsets.
Initial fluid separation will occur at early production
system well pads (four new and three existing pads) that
will be connected to the CPF via pipelines. Eight-to ten-
inch pipelines will be used to gather the gas and four-
\inch pipelines will be used to gather the liquids . Total
)length of these pipelines will be about three miles. Well
pads will be equipped with gas and liquid line scrapper
(pig) launchers to clean the interior of these pipelines.
Storm -water controls for these pipelines will be
addressed in a separate document.
A temporary storage area will be constructed on the
west side of the main CPF pad. This area will be used
to store earthmoving equipment, vehicles , construction
materials , CPF equipment, pipeline, and miscellaneous
general storage. Up to seven construction trailers and a
TBD number of Connex I trailer storage containers will
be placed in this area. The area also may be used to
store a limited amount of fuel {<1,000 gallons) for
construction equipment. All fuel storage will be
equipped with the required secondary containment and
conform to the site Spill Control and Counter Measures
(SPCC) plan and associated safety requirements. This
area will be abandoned when the CPF becomes
operation due to the proximity of the flare stack .
Site Location: The proposed facility will be located
about 2.5 miles north northwest of the end of County
Road (CR) 211 in the Clear Creek drainage (see Figure
1). The site can be accessed from Interstate 70 , exit 62,
by traveling north on local Road 45N. Road 45N north of
De Beque, Colorado, is also known as Roan Creek
Road /Drive and CR 204. The intersection of CR 211
and CR 204 is located about 12.5 miles north northwest
of De Beque. Traveling north of the intersection about
4.5 miles, one reaches the end of CR 211, where a
gated fence is encountered. An existing ranch road
continues north onto Chevron fee land .
Site Area/Disturbed Area: The initial disturbance for
the construction and installation of the CPF is about 12
acres , with a permanent disturbance of about 8.5 acres
(includes access roads and flare radius). Borro w
material wi ll be obtained from an on-site , permitted
material m ine. A general coordinate for the facility is
39 °34'17.94"N latitude, 108°20 '43.51 "W longitude NAD
83 /WGS-84.
General Topography: The CPF site lies in the
Douglas-Plateau area. It consists of narrow footh ill s
valleys, high rolling plateaus dissected by steep
canyons, narrow mountain valleys, and high mountains.
The area of exploration and production is mostly
rangeland, with the primary limitat ions for grazing being
steep slopes , short growing season, rockiness, and
limited water.
Geology: The underlying roc ks are re lative ly late
geologic age, mostly from the Cretaceous or Tertiary
periods . They range from hundreds to thousands of feet
in thickness and are generally tilt ed and unfolded. The
formations commonly extend of broad areas.
Property elevations vary from 5,800 ft (valley floor) to
8,500 ft (Roan Plateau). The Roan Plateau extends
north into Rio Blanco County, and surrounds the Skinner
Ridge development s ite. The Roan Plateau consists of
the generally stable Green River Formation .
Site Soils I Slopes: The dominant soil type is Cumulic
Haploborolls , a so il series that is placed in the hydro log ic
soil group B. Cumulic Haploborolls soils having a
moderate infilt ration rate when thoroughly wet and
consist chiefly of moderately deep or deep, moderately
well drained to well drained so ils w ith moderately fine to
moderately coarse texture. These are alluvial soils w ith a
moderate rate of wate r transmission . CPF area slopes
range from to 1 to 4 percent.
Information pub lished by the National Resource
Conservation Serv ice (NRCS) describes the area soil s
as deep, we ll to poorly drained, formed in alluvium
dominated mostly by the Green Ri ver and Wasatch
shale formations . The NRCS information details a
surf ace layer of dark grayish brown gravell y sandy c lay
loam about eight inches thick, followed by about 12-
inches of grayish brown ve ry channery sandy clay loam.
The subsoil is grayish brown clay loam about eight
inches thick The upper part of the substratum is light
brownish gray very gravelly loamy sand about 16 inches
thick, while the lower part of the substratum to a depth of
greater than 60 inches is a yellow very gravelly sand . In
some areas the surface layer is loam or silty c lay loam .
Permeability is moderate to moderately slow. And runoff
is generally slow; the hazard of water erosion is slight.
These soils are subject to brief periods of flooding as a
result of snowmelt and intense thunderstorms in the
spring and summer.
Perliminary geotechnical information indicate that the
site is covered with abou t one foot of topsoil (that wi ll be
stockpiled) with about 1 O feet of underlying med ium to
still clay wit11 sliale fragments (U nified Soll Classltlcatl on
System so il c lassification CL I SH).
The erodability of the soil based upon Revised Un iversal
Soil Loss Equat ion Version 2 (RUSLE2) is 0.17 for the Kf
Site-Specific Storm-Water I Soil Management Plan Page 2/5
Site Name: Central Production Facility!Temporary
Storage Area
(the susceptibility of the surface horizon to sheet and rill
erosion by water) and 3 for the T factor (the estimate of
the maximum average annual rate of soil erosion by
wind and/or water that can occur without affecting crop
productivity over a sustained period (rate is in tons per
acre per year).
Receiving Waters and Hydrology: Storm-water runoff
from construction activities will potentially flow south-
southwest towards Tom Creek, a tributary to Clear
Creek, Segment 14b of the Lower Colorado Sub-basin
and Basin (Regulation 37, Standards for the Lower
Colorado River Basin). Clear Creek is a tributary of
Roan Creek, which ultimately flows to the Colorado
River.
The saturated zone in portions of the area is about 54
inches depth to water, primarily due to the close
proximity to Tom Creek and Clear Creek.
Existing Vegetation: Site is currently vegetated with
grasslands used for cattle grazing. Western Wheatgrass
(Pascopyrum smithii), Basin Wildrye (Leymus cinereus},
and Basin Big Sagebrush (Artemisia tridentate) are
common in this area, which is bordered on the
north, east and south by riparian woodlands.
Dominant observed trees in the area were
Boxelders (Acer negundo L.}, and the introduced and
naturalized New Mexico Locust (Robinia neomexicana).
Observed noxious weeds in the area include Bull Thistle
(Cirsium vulgare), Common Mullein (Verbascum
thapsus}, Downy Brome or Cheatgrass (Bromus
techtorum), Musk Thistle (Carduus nuntans),
Houndstongue (Cynoglossum officina/e), and Tamarisk
(Tamarix ramosissima). Tamarisk sp. is primarily
confined to the Clear Creek channel. Weed control will
be part of the ongoing site reclamation plan.
Description of Construction Activity: Initial
construction activities at the CPF site will involve
grubbing, removal and stockpiling of topsoil, followed by
cut and fill operations necessary to construct the facility
and temporary storage pads. Details of the pad
construction can be found on drawing PBSR-59836AVF-
CIV-LAY-URS-00000-00001-00 Rev 1. Prior to any
earth moving, erosion control BMPs will be installed to
minimize site erosion and sedimentation.
Additional construction activities will include the
replacement and improvement of a culvert under Clear
Creek road. A box culvert will be used to replace the
existing, undersized corrugated metal pipe culvert. The
new culvert is designed to prevent a 100-year flood
event from affecting the CPF site. Erosion and sediment
controls including grouted riprap, non-woven control
fabric, and check dams will be used for tern porary and
permanent controls. A berm also will be constructed
along the southern edge of the site as part of the site
100-year flood control. The berm will be protected with a
combination of non-woven control fabric and riprap.
BMPs will be installed and maintained throughout the
initial, interim, and final grading stages. Initial and
ir 1teril 11 gradi119 activities will i11clade ti 1e co11st1 uctio11 of
the facility and temporary storage pads, followed by the
culvert replacement. Non-emission source building I
Date of Plan: June 26, 2008, Rev. 1
enclosure foundations will be excavated at this tim,
Emission source building I enclosure foundations will be
excavation upon receipt of the site air permit. Final
grading will be completed after the completion of the
building installations to adequately address site drainage
issues. A variety of buildings and equipment will be
required to support site operations (see Figure 2). The
interior of the site will include graveled roads I parking
areas and re-vegetated areas.
To support site construction, up to six 14 feet by 60 feet
and one 75 feet by 75 feet construction trailers plus a
TBD number of modular storage units will be placed on
the Tern porary Storage Area pad.
Upon completion of facility, final stormwater controls will
be installed and maintained throughout the life of the
project.
Soll Management: Topsoil is an extremely valuable
resource necessary for re-vegetation activities that are
mandated by several regulatory agencies (CDPHE,
COGCC, Garfield County). Because topsoil formation is
a very slow process [ranges from <0.25 mm per year for
cold, dry climates (similar to Colorado) to > 1.5 mm per
year in humid, warm climates], every effort shall be
made to conserve existing topsoil by careful excavation
and placement in a dedicated topsoil stockpile located
east of the primary facility (see Drawing PBSR-59836-
AVF-CIV-LA Y-URS-00000-00001-00). Additional
information concerning soil management is provided ir
URS I Chevron Specification for Site Preparation
Stabilization, Soil Management, Earthwork, and Backfill.
Potential Sources of Storm-Water Pollution:
• Sediment from disturbed areas and/or
construction stockpile
• Oil products associated with construction vehicles
(e.g., refueling operations, engine oil leaks, etc.)
• Vehicle washing for weed control
• Trash and sanitary facilities
Possible storm-water impacts related to these sources
are summarized on the following page.
Proposed Construction Sequence: (7/2008 thru -
3/2009)
• Stake site and clear vegetation
• Remove and stockpile topsoil
• Install initial storm-water controls (including
stockpile)
• Install and replace culvert under Clear Creek road
with appropriate erosion controls
• Grading: general excavation and fill, berm
floodplain construction, soil compaction, grading
of access and interior roads
• Construction of floodplain control berm
• Excavation of building I enclosure foundations
• Installation of building I enclosure foundations
• Construct I install buildings
• Final grading of all site features
• Stabilization I re-vegetation of interior non-road
areas
• Install permanent storm-water controls
• Erect fencing
Site-Spec ific Storm-Water I Soil Management Plan Page 3/5
Site Name: Centra l Production Fac ilityfrempo ra ry
Storage Area Date of Plan : June 26, 2008, Rev. 1
2. Site Map and Eros ion Control-see Figure 1 /Drawing PBSR-59836AVF-CIV-LAY-URS-00000-00001 -00
Information includ ed on Eros io n C o nt ro l Pl an D rawing:
• Construct io n site boundary
• Soil disturbance ar eas
• Storage areas
• S urface waters inc lud in g 100-yr fl oodplain limits
• Existi ng a nd new access roads
• Excavat ion I constructi o n d etai ls
• Locati ons of co nst ru ct ion & permane nt eros ion controls (BMP s)
3. Storm -Water Management Controls -NOTE: ALL BMPs ARE SUBJECT TO MODIFICATION AS REQUIRED BY SITE-
CONDITIONS . SITE SPECIFIC SWMP AND ASSOCIATED EROSION CONTROL DRAWING(S) WI LL BE MODIFIED TO REFLECT FIELD
CONFIGURATION AS SOON AS MODIFICATION IS COMPLETED. BMP INSTALLATIO N NARRATIVE PROVID ED AS BMP GUIDE
ATTACH MENT TO THE MASTER PLAN. BMP 's SHOWN ON DRAWINGS PBSR-59836-AVF-CIV-LAY-URS-00000-00001-00
AND 025-12-11 -065 -001.
Potential Storm Distance to Potenti al
Source Occ urrence Runoff BMPs (1>
Water Impact Surface Water Concentration
• Straw watt les Sediment High (w/o BMPs) • Straw bales transport Precipitation -Low (with well ::: 20 to 1,000+ High (without . Erosio n control blankets from events I wind maintained feet BMPs)-Low • Si lt fencing , as needed construct ion events B MPs) (wit h B MPs) • Check dams ac ti vities • Riorao
Oil products Dependent on • Inspect site for possible leakage
associated fl uid source Depe ndent of Provide designated overnight with Dependent on (e.g., high for f luid source -
.
condensa t e ve hicle vehicle refue ling; ::: 20 to 1,000+ majority typically parking area for constr uction
transport and maintenan ce low for minor feet contained in vehicles -check daily for leakage
co nstruction crankcase soi ls • Sc hed uled vehic le maintenance
ve hic les (2) leakaQe)
Vehicle Lim ited to Low -wat er and washing for when sediment from Low -limited
weed control construction t his process 1,000+ feet quant ities I Plastic lined basin with straw wattl e
(not requ ired vehicles leave cont ained by co ntro ll ed by be rm or equivalen t
after Nov. lined basin
15th) (3) the area lined basin
• Bear-proof t rash recept acle with
weekly pickup (m inim um) or
Pri maril y restrict food consumption to
separate locat ion (e.g., temporary T rash and associated Low -limi ted office)
sanitary with wind
f acilities events or Low if inspecti on ::: 20 to 1,000+ f luid vol ume . Keep si te clear of general
(bioc ide and sanitary process properly feet t ypically constructio n trash -verify during
domest ic facilit ies implemented associated with weekly inspections
wastewater) servicing sanitary facilities . Sanitary faci lities -Stake-down to
ac tiviti es prevent t ippin g durin g wind event s
I instruct vendor t o m inimize spill s
& leaks during servicing I service
frequentl y
111 See t able on Eros ion Control Detai ls on Drawing 003-12-11-061-001.
(2> Con t ro ls and response actions covered in sit e Spill Prevention, Control, and Co untermeasures (SPCC) Plan.
(
3l Pe r Garfi e ld County quidance (Oc tober 26, 2007 meetinQ wi th Steve An tho ny, Ga rfield Cou nty Veqetat ion ManaQer).
Site-Specific Storm-Water I Soil Management Plan Page 4/5
Site Name: Central Production Facili ty!Temporary
Storage Area
I 4. Operational Stablllzatlon I Reclamation
Operational Stabilization: Once construction is
completed, exterior berms and other disturbed areas will
be re-vegetated with the Seed Mix for Sites below 7 000
!t, using application rates and plant species de sign~ted
1n the URS I Chevron Specification for the Re-Vegetation
of Disturbed Areas, document number: PBSR-ALL-CIV-
SPC-URS-00000-00004-00. Any adjacent areas
disturbed by construction traffic will be re-vegetated at
this time. Fin al stabi lization will be complete when areas
have returned to 70-percent of the original vegetation
cover. The gravel access roads (installed per
construction drawings I specifications) will provide final
stab ilization in these areas but will be monitored to
determine if maintenance operations are required .
I 5. Inspection I Maintenance
Site-specific areas requiring Inspection:
Date of Plan: June 26 , 2008, Rev. 1
Noxious weed control will be continued on an as needed
basis .
Reclamation: The site will be rec laimed after the end of
its operational 1.ife in accordance with Garfield County
land use requirements . Reclamation activities will
include: removi ng pipelines, gravel from roads and
access pads; re-grading t he site to t he original contours
(approximate); replaci ng topsoil; revegetation w ith
appr~priate seed mix; and installing and maintaining any
required storm-water controls until final stabilization is
achieved.
Site inspections will be conducted in accordance with the
Master SWMP (documented by Maste r Inspection
Form).
• Site perimeter and nearby areas (e .g., adjacent stream channel -for possib le trash)
• Di sturbed I re-vegetated areas
• Soil stockpiles
• Vehicle wash area
• Tras h container I sa nitary facilities
• BMPs
)
Site-Specific Storm-Water I Soil Management Plan Pag e 5/5
Site Name: Central Produ ction Fa ci lity/Temp orary
St orage A rea
6 . Site Specific SWMP Revisions
Description of revision
Note : In sert additional sheets as needed.
Date of Plan : Jun e 26, 20 08, Rev . 1
Initiated/approved by: Date
I 1. Site-Specific SWMP Administrator (only required If different from Site Administrator)
Signature: ---------------Title: _________________ _
Printed Name: _____________ _ Date: _________________ _
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URS
Wash in gton Division
PICEANCE BASIN
NATURAL GAS DEVELOPMENT PROGRAM
Chevron
Ill
GARFIE LD COUNTY, COLORADO
SPECIFICATION FOR EROSION AND SEDIMENT CONTROL
)
1 Revised to in c lude additiona l re levant EB SMC 7-2-08 BMPs
0 Approve d for Con stru c tion
A Preli m . Iss ue d for Revi ew/Co mments M N JRV 8-10-07
REV. DESCRIPTION BY CHKD APVD cvx DATE RVWD
REVISIONS
CLIENT: CHE V RON North America Explora tion and Production
PROJECT: P iceance Bas in Natura l Gas Development Progra m
JOB NO.: 29454
DOC. NO.: PBS R-A LL C IV-S PC -U R S-00000-00003-00
H:\..Projects\Chevronl2902 1_C NAEP\SPEC IFICATIONS\Civil\EB AC 12·0·003_Erosion and Sediment Control.doc
URS Chevron
l±l Was hington Division
Date: 4/29/08 EROSION & SEDIMENT CONTROL Doc . No. PBSR-ALLCIV-SPC-URS-
00000-00003-00
Re v: 0 PICEANCE BASIN NATURAL GAS Page: 2 of 17 DEVELOPMENT PROGRAM
TABLE OF CONTENTS
SECTION PAGE
1. GENERAL ...................................................................•.................................................................... 4
1.1 Scope ............................................................................................................................................... 4
1.2 Work lncluded ................................................................................................................................. 4
1.3 Related Sections ............................................................................................................................. 4
1.4 Definitions ....................................................................................................................................... 4
1.5 References and Standards ............................................................................................................ 4
1 .6 Documents ...................................................................................................................................... 5
1.7 Submittals ....................................................................................................................................... 5
2. PRODUCTS AND BEST MANAGEMENT PRACTICES (BMP) ..................................................... 5
2 .1 Stabi lized Construction Entrance/Exit ......................................................................................... 5
2 .2 Land Gradi ng .................................................................................................................................. 5
2.3 Gravel Surfacing ............................................................................................................................. 5
2.4 Surface Roughening ...................................................................................................................... 6
2.5 Protective Bales .............................................................................................................................. 6
2 .6 Erosion Control Blankets .............................................................................................................. 6
2.7 Earth Dikes ..............................................................................................................................••...... 6
2 .8 Silt Fences ....................................................................................................................................... 6
2.9 Riprap .............................................................................................................................................. 7
2.10 Riprap-Other ................................................................................................................................. 7
2.11 Er osi on/Sediment Control Logs/Wattles ..................................................................................... 7
2 .12 Vegetative and Gr ass Buffers ....................................................................................................... 7
2.13 Check Dams .................................................................................................................................... 8
2 .14 Ct1lv e rts ........................................................................................................................................... 8
2 .15 Culvert Inlet and Outlet Protection ............................................................................................... 9
URS Chevron
IN Washington Division
Date: 4/29/08 EROSION & SEDIMENT CONTROL Doc. No . PBSR-A LL CIV-S PC-URS-
00000-00003-00
Rev: 0 PICEANCE BASIN NATURAL GAS Page: 3 of 17 DEVELOPMENT PROGRAM
2 .16 Concrete Washout Facilities ......................................................................................................... 9
2 .17 Sanitary/Septic (Port-0-Let) Waste Management ....................................................................... 9
3 . EXECUTION ..................................................................................................................................... 9
3 .1 Stabilized Construction Entrance/Exit ......................................................................................... 9
3.2 Land Grading ................................................................................................................................ 1 O
3.3 Gravel Surfacing ........................................................................................................................... 11
3.4 Surface Roughening .................................................................................................................... 11
3.5 Protective Bales ............................................................................................................................ 12
3 .6 Erosion Control Blankets ............................................................................................................ 12
3.7 Earth Dikes .................................................................................................................................... 14
3.8 Silt Fences ..................................................................................................................................... 14
3 .9 Riprap ............................................................................................................................................ 14
3 .10 Erosion/Sediment Control Logs/Wattles ................................................................................... 15
3.11 Vegetative and Grass Buffers ..................................................................................................... 15
3.12 Check Dams .................................................................................................................................. 15
3 .13 Culverts ......................................................................................................................................... 15
3.14 Culvert Inlet and Outlet Protection ............................................................................................. 15
3.15 Concrete Washout Facilities ....................................................................................................... 16
3.16 Sanitary/Septic (Port-0-Let) Waste Management ..................................................................... 16
URS
Washington Di vision
Chevron •
Date: 4/29/08 EROSION & SEDIMENT CONTROL Doc. No. PBSR-ALLCIV-SPC-URS -
00000-00003-00
Rev: 0 PICEANCE BASIN NATURAL GAS Page: 4of 17 DEVELOPMENT PROGRAM
1. GENERAL
1.1 Scope
This Specification covers the product and construction requirements for the Erosion and
Sediment Control work for Chevron's Piceance Basin Natural Gas Development Program.
Construction operations will be carried out in such a manner that erosion will be controlled and
water and air pollution minimized. State and local laws concerning pollution abatement shall be
followed. This includes complying with and implementing the Storm-Water Pollution Prevention
Plan required by the Construction Storm-Water Permit. Construction plans shall detail erosion
and sediment control measures to be employed during the construction process.
1.2 Work Included
1.3
The overall work included consists of the following: p lanning construction activities, the
installation of erosion control devices, top soil placement, seed ing, mu lching, and establishing
erosion control practices during construction activities on the site. More specific work inc ludes,
but is not limited to the following : furnishing and installation of straw bale dikes; earth dikes; s ilt
fences ; stabilized construction entrances, temporary and permanent seeding to include top soil
placement and mulching including furnishing and placing of erosion control and re-vegetation
matting.
Related Sections
1.3.1 Specification No . 12-0-002 -Site Prep arati on I Stabilization, Soil Management, Earthwork, and
Backfill
1.3.2 Specification No. 12-0-004 -Seeding , Hydro-Mulching and Re-vegetation
1.4 Definitions
1.4.1 Owner: Chevron North America Exploration and Production
1.4.2 Engineer: URS Corporation Washington Divi sion
1.4.3 Contractor: TBD
1.4.4 Subcontractor: Firm undertaking th e scope of work as defined in this Specification
1.4.5 State: Refers to State of Colorado
1.5 References and Standards
The codes, standards and regulations of the following organ izat ions in effect August 101
h , 2007
fo rm a part of this Specification to the extent indicated by the references thereto:
1.5.1 American Society for Testing and Materials (ASTM).
1 5 2 Colorado Department of Tran sportatio n (COOT), Standard Specjficat jons for Road and Bridge
Construction.
)
)
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URS
Wa shington Division
Chevron
IN
Date : 4/29/08 EROSION & SEDIMENT CONTROL Doc. No. PBSR -ALLCIV-SPC-URS-
00000-00003-00
Rev: 0 PICEANCE BASIN NATURAL GAS Page : 5 of 17 DEVELOPMENT PROGRAM
1.5.3 Bureau of Land Management (SLM) -Oil and Gas, Surface Operating Standards for Oil and Gas
Exploration and Development. Fourth Edition .
Should a conflict be found to exist between any applicable portion of the referenced codes and
standards and this Specification, the conflict shall be submitted to the Engineer for resolution
before proceeding with the affected work.
1.6 Documents
1.7
Typical Best Management Practices (BMPs) Details, URS Document Number: PBSR-ALL-RGL-
PMT-URS-00000-00003-00.
Chevron Piceance Basin Natural Gas Development Program, Storm-Water Management Plan,
Construction Storm-Water Field Permit , URS Document Number: PBSR-ALL-RGL-PMT-URS-
00000-00002-00 and PBSR-ALL-RGL-PMT-URS-00000-00002-00.
Rust Constructors , Chevron Piceance Project, Project Safety Plan , Fugitive Dust Control Plan,
Rev. 1, Proce dure Number: REC-06 .
Submittals
Prior to construction, s ubmit a plan for approval to the Engineer or their de si gnated
representative , showing implementation of the temporary and permanent erosion a nd sed im ent
control measures as shown on the Drawings.
2. PRODUCTS AND BEST MANAGEMENT PRACTICES (BMP)
2 .1 Stabilized Construction Entrance/Exit
2.1.1 A temporary stabilized vehicular entrance/exit s hould be establi shed at all points where traffic will
enter and exit the s ite . A stabilized construction entrance/exit reduces or eliminates the trac king
of sediment onto public right-of-way, streets, or parking areas where it can be washed into local
stream s or become airborne pollution due to wind affects.
2.2 Land Grading
2.2.1 Land grading involves reshaping the ground surface to planned grades as determ ine d by an
engineering survey, evaluation, and layo ut. Land grading provides more suitable topography for
buildings, facilities, and other land uses and helps to control surface runoff, soil erosion , and
se dimentation during and after construction .
2.3 Gravel Surfacing
2.3.1 Gravel surfacing simply involves covering expo sed earth surfaces with gravel to prevent soi l
erosion from occurring .
2 .3 .2 Gravel su rfacing should be used on any expo sed earthen areas, including roadways ; parking
areas; la ydown, staging, and storage-areas ; and a.round fmmeations of struetures, ineluding
where roof drains disch arge.
URS
Washington Di vision
Chevron •
Date: 4/29/08 EROSION & SEDIMENT CONTROL Doc. No. PBSR-ALLCI V-SPC-URS-
00000·00003·00
Rev : 0 PICEANCE BASIN NATURAL GAS Page: 6of17 DEVELOPMENT PROGRAM
2.4 Surface Roughening
2.4 .1 Surface roughening is a temporary erosion control practice w hereby the so il surface is roughened
by the creation of grooves, depressions, or steps that run parallel to the contour of the lan d.
2.4.2 Surface roughening is appropriate for all slopes and should be performed immediately after rough
grades have been established in an area .
2.4.3 Surfac e roughening can also be used to help estab lish vege tat ive cover by reducing runoff
velocity and giving seed an opportunity to take hold an d grow.
2.4.4 Surface roughening can be used in combination with other erosion contro l measures such as
mulching and seedi ng .
2 .5 Protective Bales
2.5.1 Protective st raw bales or other mate ria l determined to be acceptable by the Engineer or its
design ated representative containing approxi m atel y five (5) cubic feet of material , and weighing
not less than 35 pounds .
2.5.2 Bales shall be twi ne-tied .
A. Bales shall be certified free of noxious weeds .
2.6 Erosion Control Blankets
2 .6.1 Tempo ra r y erosion control blankets such as SC150 by North American Green or approved equal.
2.6.2 Perman ent erosion control blankets s uch as SC250 by North Amer ican G reen or approved equal.
2.7 Earth Dikes
All materials used as embankment for earth dikes shall be suitable for the intended use and
classified as common fill whic h meets the requirements of the Geotechnical Investigation Report
and related "Site Preparation and Earth wo rk" Specification .
2.7 .1 The Engineer or its designated representative will approve material from Project site excavations .
2.7 .2 The Engineer or its des ignated representative w ill approve off-site m aterials .
2.8 Silt Fences
2 .8.1 Because of the high wind s and severe weather in the Piceance Bas in, silt fencing shall only be
used when needed for temporary contro l or for sma ll , she ltered areas .
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URS
Washington Di vision
Chevron •
Date : 4/29/08 EROSION & SEDIMENT CONTROL Doc. No. PBSR-ALLCIV-SPC-URS-
00000-00003-0 0
Rev: 0 PICEANCE BASIN NATURAL GAS Page: 7 of 17 DEVELOPMENT PROGRAM
2 .8.2 Silt Fence Fabric: The fabric shall meet the following specif icatio ns unless otherwi se approved .
Minimum
Fabric Properties Acceptance Test Method
Value
Grab Tensile Strenath (lbs} 90 ASTM D 1682
Elongation at Failure (%} 50 ASTM D 1682
Mullen Burst Strenqth (PSI) 190 ASTM D 3786
Puncture Strenath (lbs} 40 ASTM D 751 (modified}
Slurry Flow Rat e (a al/min /s.f.} 0 .3 Virainia DOT VTM-51
Equi va lent Openina Size 40-80 US Std Sieve CW-02215
Ultraviolet Rad iation Stability(%) 90 ASTM G-26
2.8.3 Fence Posts (for fabricated un its): The length s hall be a minimum of 36 inches long. Wood posts
will be of sound quality hardwood with a minimum cross section al area of three (3) square inches.
Steel posts will be stan d ard T and U section weighing not les s than one (1) pound per linear foot.
2.8.4 Prefabricated Units : "Sedimentstop" by North Americ an Green or app ro ved equal may be used in
lieu of th e above method providing the un it is installed per manufacturer's instructions.
2.9 Riprap
2.9 .1 Material sha ll be durab le , ang ul ar field or qu arr y ston es of approved quality, sound hard free from
seams and other structu ra l defects.
2.9.2 Materia l sha ll be resistant to weathe ring and water action s and conform to the following
requirement.
A. Specific Gravity AASHTO T85 2.5 min .
B. Absorption AASHTO T85 4% max
C. Course du rabi lity index AASHTO T210 52 min.
2.1 O Rlprap -Other
2 .10 .1 Perm a nent rein forcement mat such as VMAX P550 by North American Green or approved equal
could be used in place of riprap.
2.11 Erosion/Sediment Control Logs/Wattles
2.11 .1 An erosion/sediment contro l log/watt le consists of a watt le with an exce lsior, straw, compost, or
coconut fill material constr ucted to create a pervious fi lter , ab le to facilitate overtopping . The
log/wattle promotes sediment removal on the upg radient si de and a reduction in flow velocities.
2.12 Vegetative and Grass Buffers
2.12.1 Vegetat iv e and grass buffers are used to maintain vegetate d a reas th at a re down gradient of
earthwork act ivit ies. Creating or leaving exist ing g ree n belts intact ca n slow sheet flow s, act as a
natural sed iment barrier and protect the sjte pe rim eter
URS
Washington Division
Chevron • Date : 4/29/08 EROSION & SEDIMENT CONTROL Doc. No. PBSR-ALLCI V-SPC-URS-
00000-00003-00
Rev: 0 PICEANCE BASIN NATURAL GAS Page: 8 of 17 DEVELOPMENT PROGRAM
2.12.2 Vegetative and grass buffers should be incorporated into s ite drainage, street drainage, and
master drainage planning.
2.12.3 Because their effectiveness depends on having an evenly distributed sheet flow over their
surface , the size of the contributing area, and the associated volume of runoff have to be limited.
2.12.4 Flow can be directly accepted from an impervious area such as from pa rki ng lots and build ing
roofs , provi ded the flow is distributed uniformly over the strip .
2.12.5 Vegetative and grass buffers should be protected from excessive pedestrian or vehicular t raffic
that can damage the grass cover and affect even sheet-flow dis tribution .
2.13 Check Dams
2.13.1 Check dams are small, temporary or permanent dams constructed ac ross a drainage ditch, swale
or channel to reduce the velocity of concentrated flows and to trap sediment eroded from
upstream . Check dams can be constructed out of rocks , gravel-fill ed sandbags or straw bales .
2.13.2 Check dams can be used in open channels that receive flo w from drainage between 1 and 10
acres, in steeply sloped swales, and in swales that need protection during the estab lishment of
grasses or prior to installation of a non-erodible lining .
2 .13.3 Check dams can be constructed of rock , logs , sandbags, or straw bales:
A. When using rock or stone, the material diameter shou ld be 2 to 15 inches.
B. Logs should have a diameter of 6 to 8 inches .
2.13.4 All check dams should have a maxim um height of 3 feet.
2.13.5 The center of the dam should be at least 6 inches lower than the edges to create a we ir effect
that helps to channel flows away from the banks and prevent erosion.
2.13.6 Additional stability can be achieved by implanting the dam material approximately 6 inches into
the sides and bottom of the channel
2.13.7 When installing more than one check dam in a channel , outlet stabilizat ion measures, such as
riprap , should be installed below the final dam in the series.
2.14 Culverts
2.14.1 Culverts consist of concrete or metal pipe or structures (box cul ve rts) that are installed to conduct
intermittent or constant flow around obstacles or under roadways or other related infrastructure
(utilities such as pipelines , electrical lines, water, sewer, etc.).
2.14 .2 Culverts can be used to conduct flow around obstacles or under roadways or other re lated
infrastructure and to handle intermittent or constant , manmade or natural flo ws.
2.14.3 When install ing culverts, confirm that all related stream permitting is obtained prior to installing
teR'lporary strearA orossings and that all work will be in compliance with s11ch permitting
including USAGE CWA Section 401 /404 permitting requiremen ts.
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URS Chevron • Wa shington Division
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Rev: 0 PICEANCE BASIN NATURAL GAS Page: 9 of 17 DEVELOPMENT PROGRAM
2.15 Culvert Inlet and Outlet Protection
2.15.1 Culvert inlet and outlet protection includes BMP s installed to prevent erosion, scour, and
undercutting at culvert inlet and outlets.
2.15.2 Culvert inlet and outlet protection typically consists of other BMPs installed in conjunction with
typical culverts , in p a rticular riprap .
2.15.3 When installing culverts inlet and outlet protection , confirm that all related stream permitting is
obtained prior to installing temporary stream crossings and that all work will be in compliance with
such permitting -including USAGE CWA Section 401 /404 permitting requirements .
2.16 Concrete Washout Facilities
2.16.1 Concrete washout facilities are used to prevent or reduce the discharge of pollutants to storm-
water from concrete waste by conducting washout offsite, performing onsite washout in a
designated area, and training employee and subcontractors.
2 .16.2 Concrete washout facilities are used on construction projects where:
A. Concrete is use d as a construction material or where concrete dust and debris result form
demolition activities .
B. Slurries containing portland cement concrete or asphalt concrete are generated, such as
from saw cutting, coring , grinding, grooving, and hydro-co ncrete demolition.
C. Concrete truck s and other concrete-coated equipment are washed onsite .
D. Mortar-mixin g stations exist.
2.17 Sanitary/Septic (Port-0-Let) Waste Management
2.17 .1 Proper sanitary and se ptic waste management preve nts the di scharge of pollutants to storm-
wate r from sanitary a nd septic w as te by providing convenient, well-maintained faciliti es, and
arranging for regular se rvice and dis posal.
2.17.2 Sanitary or septic wastes should be treated or disposed of in accordance with state and loca l
requirements. In m any cases, one contract with a loca l facility supplier will be all that it t akes to
make su re sanitary waste s are properly d is posed. •·
3. EXECUTION
Contractor shall assume sole respon sibility for temporary and permanent erosion and sediment
control , as sh own on the Drawings . Da mages from erosion a nd sedimentat io n shall be corrected
at no cost to the Engineer.
3.1 Stabilized Construction Entrance/Exit
3.1.1 Construct stab ili ze d construction entrance/exits at the beginning of earthwork operations at the
locations shown on the Drawings .
3.1.2 En trance/ex its must be properly graded to prev e nt runoff from leaving th e sit e.
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3.1.3 Entrance/exits should be designed to support the heaviest vehicles and equipment that will use it.
3.1.4 Aggregate Thickness -Not less than ten (10) inches for all en trances.
3.1.5 Width -20 foot minimum but not less than the full width of points where ingress or egress occurs.
3.1.6 Length -As required, but not less than 50 feet.
3.1. 7 Aggregate material should be placed over the geotextile fabric to prevent sediment from the base
material from m igrating into the aggregate.
3.1.8 Pipi ng of surface wa ter under entrance shall be provided as required. If pip ing is not feas ible, a
mountable berm with fi ve horizontal to one vert ical (5:1) slopes will be permitted .
3.1.9 The entrance shall be maintained through the duration of this Contract in a condition which w il l
prevent tracking of sediment onto public rights-of-way or streets. This may require pe riodic top
dressing with additional aggregate.
3.1.1 O All sediment spilled, dropped, or washed onto public rights-of-way must be removed immediately.
3.1.11 The gravel and filter fabric must be removed upon completion of the construction and disturbed
soi l areas resulting from removal shall be permanently stabilized.
3.1.12 When necessary, wheels must be cleaned to remove sed iment prior to entrance onto public
rights-of-way.
A. When washing is required , it shall be done on an area stabilized wit h aggregate wh ich
drains into an approved sedimen t trapping device.
8. All sediment shall be prevented from entering storm dra ins , ditches, or watercou rses.
3.2 Land Grading
3.2.1 Grading activities should maintain existing drainage patterns as much as possib le.
3.2.2 Before grading activities begin, decisions must be made regarding the steepness of cut-an d-fill
slopes and how the slopes will be protected from runoff, stabilized, and maintained.
3.2.3 A grading plan should be prepared that establishes and includes:
A. Identification of areas of the site to be graded.
B. How drainage pattern s wi ll be directed .
C. How runoff velocities will affect receiving waters.
D. Inform ation regarding when earthwork will start and stop.
E. The degree and length of finished slopes .
F. Where and how excess material will be disposed of (or where borrow materials will be
obtained if needed).
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G. Berms , diversions , and other storm-water BMPs that require excavation and filling should
be incorporated into the grading plan .
3.3 Gravel Surfacing
3.3.1 Engineering design is required for gravel to be used on roadways, parking areas , and around
foundations , including proper crowning features and to meet appropriate compaction
requirements .
3.3.2 Selection of gravel size and depth should consider the use of the area to be covered, including
factors such as types and frequency of traffic, duration of establishment (temporary or
permanent), anticipated storm-water volumes (due to direct precipitation and surrounding area
runon /runoff), etc.
3 .3.3 Permeable fabric membranes/liners should be installed at the soil and gravel interface to prevent
rutting and soil and mud from rising through the gravel due to traffic impacts.
3.3.4 Binders such as magnesium chloride may be applied to help fi x and secure gravel surfaces in
place.
3.3 .5 The condition of gravel surfaces should be inspected regularly , after any major storm s and at
least once a year to ens ure that the surfaces and subsurfaces are sound and have not been
s ubject to eros ion .
3.3.6 Gravel should be repleni shed due to los ses from compaction, drag-out, and s preading, especially
in high-traffic area s.
3.3 .7 Gravel may need to be re placed and /or repaired if soil or mud rise s through or is tracked by traffic
into gravel areas and following winter season s , especially if surfaces are plowed for snow
removal.
3.4 Surface Roughening
3.4.1 Cut Slope Roughening:
A. Stair-step grade or groove the cut slopes that are steeper than 3: 1.
B. Use stair-step grading on any erodible material soft enough to be ripped with a bulldozer.
Slopes consisting of soft rock with some subsoil are particularly suited to stair-step
grading.
C. Make the vertical cut distance less than the horizontal dist a nce, and slightly slope the
horizontal position of the "step" in toward the vertical wall.
D. Groove the slope using machinery to create a series of ridges and depressions th at run
across the slope , on the contour.
3.4.2 Fill Slope Roughening :
A Pl ace fill slopes with a gradient steeper t han J ·1 in lifts not to exseed B inches, and make
s ure each lift is properly compacted.
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Washi ngton Division
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B. Ensure that the fa ce of the slope consists of loose , uncompacted f ill 4 -6 inches deep.
C. Use grooving or tracking to roughen the face of the s lopes, if necessary.
D. Apply seed, fertili ze r and straw mulch then track or punc h in the mulch with t he bu lldoze r.
E. Do not blade or scrape the final slope face.
3.4.3 Rough en in g With T racked Machinery:
A. Lim it roughening with tracked mach inery to soils with a sandy textural componen t to
avoid undue compaction of the soi l s urface.
B. Operate tracked m ac hinery up and down the slope to leave horizontal depressions in the
so il. Do not back-bl ade during the final grading operation.
C. Immed iate ly seed and mulch roughened areas to obtain optimum seed germination and
growth.
D. Check for erosion and sloughing, and make any required repai rs.
3.5 Protective Bales
3.5 .1 In stall sediment barrier bales at the locations as show n on the Drawings.
3.5 .2 Straw bale barriers should consis t of two parallel rows with:
A. Th e ends of bales butted t ightly.
B. Butt joints staggered between front and back rows.
C. Each row of bales trenched in and firmly staked.
3.5 .3 Anchor b ales with eith er two wood stakes or four bars driven th rough th e bale and into t he soi l.
Drive the first stake towards the butt joint with the adj acen t bale to force the bales tog ether.
3.5.4 Straw bales degrade, espec iall y when exposed to moi sture. Rotting ba les will need to be
replaced on a regular basis.
3.5.5 Sediment that accumul ates in the BMP must be periodically removed in order to maintain BMP
effectiveness. Sediment shou ld be removed when the sed iment accu m ulation reaches one-th ird
of the barrie r height.
3.5 .6 Rem ove straw bales whe n no longer needed . Remove se diment accumulation , and clean,
regrade, and stab ilize th e area.
3 .6 Erosion Control Blankets
3.6.1 Erosion con trol blanket s/mats sho ul d not be used in swales wi th slop es greater than 5 percen t or
with storm water velocities > 81eet per second.
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Rev: 0 PICEANCE BASIN NATURAL GAS Page: 13 of 17 DEVELOPMENT PROGRAM
3.6.2 Erosion control blankets/mats should not be used in areas subject to scour from high flows (e .g.
streambanks) unless designed by an engineer.
3.6.3 Permits shall be obtained prior to any streambank or shoreline installation of erosion control
blankets/mats, including United States Army Corps of Engineers (USACE) Clean Water Act
(CWA) Section 401/404 permits.
3 .6 .4 Proper site preparation is essential to ensure complete contact of the protection matting with the
soil:
A. Grade and shape area of installation.
B. Remove all rocks , clods, vegetative or other obstructions so that the installed blankets , or
mats will have direct contact with the soil.
C. Prepare seedbed by loosening 2-3 inches (50-75 mm) of topsoil above final grade.
D. Seed area before blanket installation for erosion control and re-vegetation . (Seeding after
mat installation is often specified for turf reinforcement application.)
3.6.5 U-shaped wire staples, metal geotextile stake pins, or triangular wooden stakes can be used to
anchor mats to the ground surface:
A. Wire staples should be a minimum of 11 gauge.
B. Metal stake pins should be 3/16 inch diameter steel with a 1 1/2 inch steel washer at the
head of the pin.
C . Wire staples and metal stakes should be driven flush to the soil surface.
D. All anchors should be 6-8 inches long and have sufficient ground penetration to resist
pullout.
E. Longer anchors may be required for loose soils .
F. Begin at the top of the slope and anchor its blanket in a 6 inch deep x 6 inch wide trench.
G. Backfill trench and tamp earth firmly.
H. Unroll blanket downslope in the direction of the water flow.
I. The edges of adjacent parallel rolls must be overlapped 2-3 inches and be stapled every
3 feet.
J . When blankets must be spliced, place blankets end over end (shingle style) with 6 inch
overlap. Staple through overlapped area, approximately 12 inches apart.
K. Lay blankets loosely and maintain direct contact with the soil -do not stretch.
L. Blankets shall ee stapled suffieienHy4e-anchor blanket and maintain contact with ti 1e soil.
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Wash ington Division
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M. Staples shall be placed down the center and staggered with the staples placed along the
edges.
N. Steep slopes, 1:1to2:1, require 2 staples per square yard .
0 . Moderate slopes, 2:1 to 3:1 , require 1-2 staples per square yard (1 staple 3' on center).
P. Gentle slopes require 1 staple per square yard.
3.6.6 Any failure should be repaired immediately. Replacement of fabric sections may also be
necessary.
3.6.7 If washout or breakage occurs, re-install the material after repairing the damage to the slope or
drainageway.
3.7 Earth Dikes
Install earth dikes at the locations shown and as detailed on the Drawings or in accordance with
BMP.
3.8 Silt Fences
3.8.1 Install silt fences at the locations shown and as detailed on the Drawings.
3.8.2 All silt fences shall be placed as close to the contour as possible and the area below the fence
must be undisturbed or stabilized.
3.8.3 Silt fence and fence stakes and posts should be installed as follows:
A. Stakes or posts should be placed to the downhill side of the fence.
B. The bottom edge of the fabric must be continuously and securely entrenched and
covered with backfill or anchored for its entire length to prevent undermining .
3.8.4 Silt fences must be inspected regularly to make ensure they are intact and that there are no gaps
where the fence meets the ground or tears along the length of the fence.
3.8.5 If gaps or tears are found, repair or replace the fabric immediately.
3.8.6 Remove accumulated sediments from the fence base when the sediment reaches one-third to
one-half the fence height.
3.8 .7 When silt fences are removed the accumulated sediment must be removed as well.
3.9 Riprap
3.9.1 The following inspection and maintenance procedures should be followed:
A. Inspect for signs of slope erosion under and around the rock protection .
B. Inspect for signs of erosion and undercutting around structures.
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C. Check for erosion and displacement of rock at inlets and outlets .
D. Inspect for displacement of riprap or damage to underlying fabric, and signs of scour
beneath the riprap or around the outlet.
E. Replace rock and repair as needed.
3.10 Erosion/Sediment Control Logs/Wattles
3.10.1 Erosion/sediment control logs/wattles should be trenched into the ground a minim um of 2 inches
and staked or stapled into the ground.
3.10.2 Sediment accumulated upstream of wattles shou ld be removed when the sediment depth
upgradient of the log /wattle is within ~ of the height of the crest or when debris accumulation
compromises the effectiveness of the feature .
3.11 Vegetative and Grass Buffers
3.11 .1 In stall vegetative and grass buffers at the locations shown and as detailed on the Drawings.
3.12 Check Dams
) 3.12 .1 Large debris , trash , and leaves should be removed from check dams during routine inspections .
3.12.2 If e rosion or heavy flows cause the edges of a dam to fall to a height equal to or below the height
of the cen ter, repairs should be made immediately.
3.12.3 Accumulated sediment shou ld be removed from the upstream s id e of a check dam when the
sediment has re ached a height of approximately one-half the original height of the dam
(measured at the center).
3.12.4 All accum ulated sediment s hould also be removed prior to removing a check dam .
3.12.5 Removal of a check dam should be completed only after the contributing drainage area has been
completely stabi lized .
3.12.6 Permanent vegetation should replace areas from which gravel, stone , log s, or other materials
have been removed .
3.13 Culverts
3.13.1 Sediment accumu lated upstream of st re am crossings should be removed when the sediment
depth is within 6-inches of the crest (ford crossing) or greater than an average depth of 12-inches
(culvert crossing).
3.13.2 Ford stream crossings should be lined with filter fabr ic and then layered with a minimum 6 -inch
layer of 1112'' in ch diameter rock .
3.14 Culvert Inlet and Outlet Protection
3.14.1 When installing and constructing culvert inlet and outlet protection , the use of recycled concrete is
not an acceptab le sub stitute for rock.
URS
Washington Division
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3.14 .2 Sediment accumulated upstream of stream crossings shou ld be removed when the sed im ent
depth is within 6-inches of the crest (ford crossing) or greater than an average depth of 12-inches
(culvert crossing).
3.15 Concrete Washout Facilities
3.15.1 When establishing onsite concrete washout facilities the following gu idelines shou ld be followed:
A. Locate washout area at least 50 feet from storm drains, open ditches , or water bod ies.
B. Avoid creating runoff by draining water to a bermed or le vel area whe n washing conc rete
to remove fine particles and expose the aggregate.
C. Post a sign adjacent to each washout facility to inform concrete equipment operators to
utilize the proper facilities.
D. Do not allow runoff from this area by constructing a temporary pit or bermed area large
enough for liquid and solid waste.
E. Only concrete from mixer truck chutes should be washed into concrete wash out.
F. Once concrete wastes are washed into the designated area and allowed to harden, the
concrete should be broken up , removed , and disposed of.
3.15.2 In spectio n and Maintenance:
A. Inspect concrete washout facilities weekly during the rainy season and on two-week
intervals in the non-rainy season to verify continued BMP implementation .
B. Temporary concrete washout facilities should be maintained to provide adequate holding
capacity with a minimum freeboard of 4 inches for above grade facilities and 12 inches
for below grade facilities.
C. Maintaining temporary concrete washout facilities should include removing and disposing
of hardened concrete and returning the facilities to a functional condition.
D. Washout facilities must be cleaned, or new facilities must be constructed and ready for
use once the washout is 75 percent full.
3.16 Sanitary/Septic (Port-0-Let) Waste Management
3.16.1 Storage and disposal procedures for sanitary/septic waste management facili ties include the
following:
A. Temporary sanitary facilities should be located away from drainage facilities,
watercourses, and from traffic circulation.
B. Temporary sanitary facilities should be secured to prevent overturning due to high winds
or risk of high winds.
C. Only reputable , licensed sanitary and septic waste haulers should be used.
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D. Sanitary facilities should be located in a convenient location.
E. Untreated raw wastewater should never be discharged or buried.
F. Regular waste collection by a licensed hauler should be arranged before facilities
overflow.
3.16.2 Education:
A. Educate employees, subcontractors , and suppliers on sanitary and septic waste storage
and disposal procedures .
B. Educate employees, subcontractors, and suppliers of potential dangers to humans and
the environment from sanitary and septic wastes.
C. Instruct employees , subcontractors , and suppliers in ident ification of sanitary and septic
waste.
D. Hold regular meetings to discuss and reinforce disposal procedures (incorporate into
regular safety meetings).
E. Establish a continuing education program to indoctrinate new employees.
3.16.3 Inspection and Maintenance:
A. Inspect and verify that activity-based BMPs are in place prior to the commencement of
associated activities.
B. While activities associated with the BMP are under way, inspect weekly during the rainy
season and of two-week intervals in the non-rainy season to verify continued BMP
implementation .
C. Arrange for regular waste collection .
D. If high winds are expected , portable sanitary facilities must be secured with spikes or
weighed down to prevent over turning.
)
Procedure Type
Rust Constructors
FUGITIVE DUST CONTROL PLAN
1.0 Purpose:
PROJECT SAFETY PLAN
CHEVRON Piceance Project
Revision No I Status Procedure No .
1 / AFU REC-06
Revis ion Date Page
16 December 07 1 of 3
1.1 This Fugitive Dust Control Plan describes the general control measures to be taken by Rust
Constructors Inc. with all Subcontractors creating dust conditions to ensure that dust
suppression techniques are implemented to control fugitive dust sources during all
construction operations.
1.2 Measures identified in this plan apply to work within the project area defined as the right-of-
way , access roads, temporary use areas , facilities and other areas used during
construction of the Project.
1.3 All Subcontractor personnel are to be thoroughly familiar with this plan and its contents prior
to initiating their construction activities on this Program.
2.0 Requirements for Dust Control
2.1 Each Subcontractor creating fugitive dust conditions is required to provide dust control
measures for all areas disturbed by construction. The measures addressed within this
section shall be required, as necessary, to control fugitive dust.
2.2 Dust control shall be implemented by each Subcontractor generating dust in areas of active
construction, within 500 feet of highways, residences, and power transmission rights-of-way
(unless waived by the owner/operator).
2.3 Dust control is required near roadways any time dust stays in the air for 5 minutes or
reaches 20 feet in height.
2.4 Dust control shall also be implemented on access roads, as determined by Rust
Constructors Inc., and as required by the Contractor for the health and safety of employees.
2.5 Dust control shall be achieved primarily through application of water or an approved dust
palliative. Application rates for the dust palliative will follow the manufacturer's
recommendations . All dust palliatives used shall be biodegradable. Use of salts with water
as a suppressant is lim ited to magnesium chloride (MC70).
3.0 Control of Unpaved Roads On-Site
3.1 During construction, operation , and maintenance of the project, each Subcontractor shall
control vehicle speed to minimize fugitive dust.
3.2 Each Subcontractor shall apply dust suppressants to the construction work area and access
roads at the request of Rust Constructors Inc., Client Representatives , the BLM ,' or county
or state repres entatives .
Pro cedure Type
Rust Constructors
FUGITIVE DUST CONTROL PLAN
PROJECT SAFETY PLAN
CHEVRON Piceance Project
Revision No I Status Procedure No.
1 I AFU REC-06
Revision Date Page
16 December 07 2 of 3
3.3 Subcontractor shall employ control measures or operations procedures including but not
limited to, watering, chemical stabilization, road carpeting , paving, suggested speed
restrictions and other approved methods and techniques as required to maintain dust
control on unpaved roads.
4.0 Control of Paved Roads
4.1 Each Subcontractor shall implement the following requirements on paved roads:
a. Construction entrances shall be installed to prevent tracking mud and soil onto paved
roads . These entrances shall be constructed as required by county, state, or BLM
permits.
b. The Subcontractor shall clean any soil tracked onto a paved road that extends more
than 50 feet from the point of origin within one hou r of discovery.
c . Any soil tracked onto a paved road that extends less than 50 feet shall be cleaned up by
the end of the working day.
d. Additional control measures or operational procedures may include but are not limited
to, covering the loaded haul truck, washing or otherwise treating the exterior of the
vehicle, limiting the size of the load and the vehicle speed, watering or treat ing the load
with chemical suppressants, and kee ping the roadway access point free of materials that
may be carried onto the roadway and other approved methods and techniques as
required .
5.0 Control of Disturbed Areas On-Site
5.1 During construction , operation, and maintenance of the project, each Subcontractor will
suppress dust with application of water or other suppressant as needed, and will control
vehicle speed to 15 mph . All areas disturbed by construction will be revegetated in
accordance with th e Client's Reclamation Plan .
5 .2 Each Subcontractor shall apply dust suppressants to the construction work area and access
roads at the request of Rust Constructors Inc., Client Representatives, the BLM, and/or
county or state representatives .
5.3 Additional control measures or operational procedures for controlling dust during construction
activities may includ e but are not limited to , planting vegetation cover, provid ing synthetic
cover, furrows, and compacting, minimizing disturbed area in winter, w ind b re aks and other
approved methods and techniques as required.
)
)
)
Pro ce dure Type
Rust Constructors
FUGITIVE DUST CONTROL PLAN
PROJECT SAFETY PLAN
CHEVRON Piceance Project
Revision No I Status Procedure No.
1 / AFU REC-06
Revision Dat e Page
16 December 07 3 of 3
6.0 Records
Records generated shall remain in site files until demobilization at which time they shall be retained
in long-term storage.
7 .0 Referenced Forms
None
8.0 References
9.0
Colorado Department of Public Health and Environment (CDPHE) Air Pollution Control Division
(APCD)
Bureau of Land Management "Gold Book", Fourth Edition, 2006
Garfield County Rules a nd Regulations
Attachments
None
URS
Washingto n Divis ion
PICEANCE BASIN NATURAL GAS DEVELOPMENT
PROGRAM
Garfield County, Colorado
SPECIFICATION FOR
SITE PREPARATION I STABILIZATION, SOIL MANAGEMENT,
EARTHWORK, AND BACKFILL
1 Addition of Erosion Control I Soil SMC 07/02/08 Management Req uirements
0 Approved for Construction LOM TM H C 04/15/08
A Iss ued Pre liminary f or Review and MN JR V 07/18/07 Comments
REV . DESCRIPTION BY CHKD APVD cvx DATE RVWD
REVISIONS
CLIENT: CH EVRO N Nort h Ame ri ca Exp loration and Production
PROJECT: Piceance Basin Natural Gas Development Prog ram
JOB NO.: 29454
DOC NUMBER: PBSR -ALL C IV-SPC-URS-00000-00002-00
H:\_Projects\Chevron\29021_CNAEP\Regulato ry\Final Application s\Adde ndums to SUP Submittal\CPF\12·0·002_Site Prep , Soil M gmt, & Earthwo rk.d oc
URS
Washington Division
Ch evron •
Date: 28Jun08 SITE PREPARATION I STABILIZATION, SOIL Doc. No. PBSR·ALLCIV·SPC·URS·
MANAGEMENT, EARTHWORK AND BACKFILL 00000-00002·00
Rev: 1 PICEANCE BASIN NATURAL GAS DEVELOPMENT Page: 1of8 PROGRAM
TABLE OF CONTENTS
SECTION PAGE
1. SCOPE ............................................................................................................................................. 1
2. DEFINITIONS ................................................................................................................................... 1
3. REQUIRED REFERENCES ............................................................................................................. 1
4. DOCUMENTS .................................................................................................................................. 2
5. REPORTS ........................................................................................................................................ 2
6. SPECIFICATIONS ........................................................................................................................... 2
7. SITE EVALUATION I EXISTING VEGETATION DOCUMENTATION ........................................... 3
8. CLEARING I GRUBBING I DRAINAGE I PRELIMINARY EROSION CONTROL ......................... 3
9. TOPSOIL REMOVAL I MANAGEMENT ......................................................................................... 4
10. EXCAVATION -GENERAL ............................................................................................................. 4
11 . FILL I BACKFILL I COMPACTION ................................................................................................. 5
12. QUALITY ASSURANCE .................................................................................................................. 6
13. ADDITIONAL REQUIREMENTS FOR TANK SUBGRADE ............................................................ 7
14. GRADING ......................................................................................................................................... 7
15 . ADDITIONAL REQUIREMENTS FOR ROADWAY SUBGRADE ................................................... 8
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URS Ch evron • Washington Di visio n
Date: 28J un08 SITE PREPARATION I STABILIZATION, SOIL Doc. No. PBSR-ALLCIV-SPC-URS-
MANAGEMENT, EARTHWORK AND BACKFILL 00000-00002-00
Rev: 1 PICEANCE BASIN NATURAL GAS DEVELOPMENT Page: 1 of 8 PROGRAM
1. SCOPE
1.1 This scope covers the re qu irements for site preparation, soil management, gene ral earthwork,
preparation of tank sub-grades and tank dikes.
2. DEFINITIONS
2.1 Owner: Chevron North America Exploration and Product ion
2.2 Engineer: URS Corporation Washington Division
2 .3 Contractor: TBD
2.4 Subcontractor: Firm undertaking the scope of work as defined in this Specification
2.5 State : Refe rs to State of Colorado
3. REQUIRED REFERENCES
This Section lists Standards, Codes and Specifications that are referenced and assumed to be a
part of this document. Unless otherwise specified herei n , use th e latest ed ition .
3.1 ASTM-American Society for Testing and Materials
ASTM C 33-03 Standard Specification for Concrete Aggregates .
ASTM C 117 -04 Standard Test Methods for Material Fin er Than # 200 Sieve in Aggregates
by Washing.
ASTM C 136-06 Standard Test Meth od for Sieve Analys is of Fine and Coarse Aggregates.
ASTM D 422-63 Standard T est Method for Part ic le-s ize Ana lys is of Soil s.
ASTM D 1140 Standard Test Methods for Amount of Material in Soils Finer Than the No.
200 (75-Micrometer) Sieve
ASTM 1556 Standard Method for Density and Unit Weight of Soil in Place by the Sand
Cone method .
ASTM D 1557 Standard Test Methods for Laborator y Compaction Characte ristics of Soil
Using Modified Effo rt (56,000 ft-lb f/ft3 (2,700 kN-m/m3))
ASTM D 2167 Standard Test Method for Den sity an d Unit Weigh t of Soil in Place by the
Rubber Balloon Method
ASTM D 2216 Standard T est Methods for Laboratory Determination of Water (Moisture)
)
URS Ch evron • Wa shington Divisio n
Date: 28Jun08 SITE PREPARATION I STABILIZATION, SOIL Doc. No. PBSR-ALLCI V·SPC-URS-
MANAGEMENT, EARTHWORK AND BACKFILL 00000-00002-00
Rev: 1 PICEANCE BASIN NATURAL GAS DEVELOPMENT Page : 2 of 8 PROGRAM
Content of Soil and Rock by Mass .
ASTM D 2922 Standard Test Methods for Dens ity of Soil and Soil-Aggregate in Place by
Nuclear Methods (Shallow Depth)
ASTM D 2937 Standard Test Method for Den sity of Soil in Place by the Dri ve-Cylinder
Method
ASTM D 3017-05 Standard Method for Water Content of Soil and Ro ck in Place by Nuclear
Methods (Shallow Depth)
ASTM D 4253 Standard Test Methods for Maximum Index Density and Unit Weight of
Soils Using a Vibratory Table
ASTM D 4254 Standard Test Methods for Minimum Index Density and Un it Weight of Soils
and Calculation of Relative Density
ASTM D 4318 Standard Test Methods for Liquid Lim it, Plastic Limit, and Plasticity Index of
Soils
4. DOCUMENTS
Typical Best Management Practices (BMPs) Details, URS Document Number: PBSR-ALL-RGL-PMT-
URS-00000-00003-00.
Chevron Piceance Basin Natural Gas Development Program, Storm-Water Management Plan ,
Construction Storm-Water Field Permit, URS Document Number: PBSR-ALL-RGL-PMT-URS-00000-
00002-00 and PBSR-ALL-RGL-PMT-URS-00000-00002-00.
Rust Constructors, Chevron Piceance Project , Project Safety Plan, Fug iti ve Dus t Control Plan , Rev. 1,
Procedure Number: REC-06 .
5. REPORTS
1.1 Geotechnical Investigation for facility specific area.
6. SPECIFICATIONS
6.1 12-0-001 Civil Design Basis
6.2 12-0-003 Erosion and Sediment Control
6.3 12-0-004 Re-Vegetation of Disturbed Areas
6.4 12-0-005 Aggregate Base Course
6.5 12-0-007 Fences and Gates
2
)
)
URS Chevron • Washington Di vision
Date: 28JunOB SITE PREPARATION I STABILIZATION, SOIL Doc. No. PBSR-ALLCI V-SPC-URS-
MANAGEMENT, EARTHWORK AND BACKFILL 00000·00002-0 0
Rev: 1 PICEANCE BASIN NATURAL GAS DEVELOPMENT Page : 3 of 8 PROGRAM
6.6 12-0-009 Excavation , Backfilling and Compaction for Utilities
7. SITE EVALUATION I EXISTING VEGETATION DOCUMENTATION
7.1 The site shall be evaluated to determ ine potential problem areas for contro l of storm-water runoff .
Erosion control drawings, the master storm-water management plan , and the site specific storm-
water management plan shall be reviewed prior to any land disturbance acti vities .
7.2 Photos of existing site conditions shall be obtained to document pre-const ruc ti on vegetative
co ver. This information is needed to determine when the site has reached sufficient re-vegetati ve
cover to meet regulatory requirements. Pre-construction site photos shall be provided to the on-
site storm-water management plan coordinator.
8. CLEARING I GRUBBING I DRAINAGE I PRELIMINARY EROSION CONTROL
8.1 All earthwork construction shall be evaluated for erosion potential and appropriate controls
measures (Best Management Practices -BMPs) shall be specified I installed the poten t ial for
soils erosion , measures shall be taken to mitigate such erosion, when spec if ied . Refe r to URS
Documents: PBSR-ALL-RGL-PMT-URS-00000-00002 -00 and PBSR-ALL-RGL-PMT-URS-00000-
00003-00 and Specification 12-0-003.
8.1.1 Preliminary erosion controls (e.g ., silt fencing, straw wattles , berms , etc .) shall be installed as
soon as sufficient vegetation has removed to allow install ation. Som e areas w it h high erosi o n
risk may require the installation of several interim control measures.
8.2 Active dust control methods shall be imple mented , as necessary, throughout the cl earing and
gr ubbing operations . Dust control procedures for this p roje ct are docu ment ed in th e R ust
Constructors, Chevron Piceance Project , Project Safety Plan , Fugiti ve Du st Control Pl an, Rev. 1,
Procedure Number: REC-06.
8.3 Clearing, at the spec ified site work areas, shall include the remova l of a ll t rees , bu shes , and oth e r
vegetation . It shall al so include the removal of den se gro wth o f ground plants , matted dead
vegetation and rubbish resting on natural grade.
8.4 Clearing shall include the specified (as identified on the draw ings ) removal of any ex isting
structures, foundations , buried service piping and conduits.
8.5 Grubbing, at the specified site work areas , shall include the ex cavation and co mplet e remo va l of
tree stumps. Grubbing also shall include the excavation and complete remo val of all othe r p lant
life, including root structures, plus rubbish.
8.6 Exceptions to the depth for grubbing are as follows for the speci fic s it e work areas shown below:
8.6 .1 Drainage ditches shall be grubbed to a depth no less than one (1 ) foot (3 00 mm) beneath the
finished side slopes and bottom .
3
)
)
URS Chevron • Wa shington Di vis ion
Date: 28Jun08 SITE PREPARATION I STABILIZATION, SOIL Doc. No. PBSR-ALLCIV-SPC-URS·
MANAGEMENT, EARTHWORK AND BACKFILL 00000-00002-0 0
Rev: 1 PICEANCE BASIN NATURAL GAS DEVELOPMENT Page: 4 of 8 PROGRAM
8.6.2 Areas directly under tanks sha ll be grubbed to a depth of two (2) feet (600 m m) below the
tank bottom but not less than six (6) inches (150 mm) be low natural grade over the entire
tank bottom.
8.6.3 Areas under earth dikes for tanks and pit areas around tanks shall be grubbed to a depth of
two (2) feet (600 mm) below finished grade but not less than six (6) inches (150 mm) below
natural grade.
8.6.4 Embankment slopes shall be grubbed to a depth of at least one (1) foot (300 mm) beneath
the finished slope.
8.6.5 Areas for piping between unit area limits and ditches , and along roads, shall be grubbed to a
depth of two (2) feet (600 mm) below finished grade but not less than six (6) inches. (150
mm) below natural grade.
8.6.6 All organic material, including trees , stumps, roots, and brush shall be removed from the site
work areas as directed by the Contractor.
8.7 All storm-water controls should be inspected for functional integrity fo ll owing clearing and
grubbing operations and repaired as necessary.
9. TOPSOIL REMOVAL I MANAGEMENT
9.1 Top so il is an extremely valuable resour ce neces sary for re -vegetat ion activ ities that are
mandated by severa l regulatory agencies (CDPHE , COGCC, Garfield County). Because topsoil
formation is a very s lo w process [ranges from <0.25 mm per year for cold, dry cli mates (similar to
Colorado) to > 1.5 mm per year in humid, warm climates], every effort shall be made to conserve
existing topsoil by careful excavation and placement in a dedicated topsoil stockpile.
9.2 Appropriate interim and permanent erosion control measures shall be installed on the topsoil
stockpile, as soon as practical, to protect the topsoil resource from wind and water erosion.
9.3 Active dust control methods shall be implemented, as necessary, throughout all to pso il removal
and stockpiling operations. Dust control procedures for this project are documented in the Rust
Constructors , Chevron Piceance Project , Project Safety Plan, Fugi tive Dust Control Plan , Rev. 1 ,
Procedure Number: REC-06.
9.4 A vegetative cover sha ll be established on the topsoil stockpi le (or equivalent control technique)
to stabilize the resource until it is needed for site reclamation I re-vegetat io n.
9.5 All storm-water controls should be inspected for functiona l integrity foll owi ng topso il stockpil ing
operations and repaired as necessary.
10. EXCAVATION -GENERAL
10.1 All excavation activities shall be reviewed to determine if erosjon control measures are
necessary. Appropriate erosion interim and /or permanent controls sha ll be insta ll ed as soon as
practical.
4
)
URS
Washington Division
Chevron •
Date: 28Jun08 SITE PREPARATION I STABILIZATION, SOIL Doc. No. PBSR-A LLCIV-S PC-UR S-
MANAGEMENT, EARTHWORK AND BACKFILL 00000-00002 -00
Rev: 1 PICEANCE BASIN NATURAL GAS DEVELOPMENT Page: 5 of 8 PROGRAM
10.2 Active dust control methods shall be implemented, as necessary, throughout all excavation
operations. Dust control procedures for this project are docume nted in the Ru st Constructors,
Chevron Piceance Project, Project Safety Plan , Fugitive Dus t Control Pl an, Rev. 1, Procedure
Number: REC-06 .
10.3 Rock, if encountered in pipe trenches, shall be removed to at least si x (6) inches (150 m m) below
bottom of pipe.
10.4 If trench bottom materials are soft, they shall be stabilized as recommended by the appropr iate
geotechnical firm representative. One potential method of stabilization in cl uded the soft zone be
removed and replaced with coarse granular material, leve le d and compacted to t he prescribed
grade.
10.5 If soft or unstable materials are encountered near the bottom of a foundation excavation , the
Contractor shall be advised immediately. Measures taken to remedy such cond it ions shall be
approved by the geotechnical f irm representati ve.
10.6 If a structure or foundation is founded on rock, the rock shall be stripped clean and cut leve l,
stepped or serrated . Foundations shall not be supported by mixed foundation types or m ixed
ground support strata.
10.7 Excavated materials shall be dis posed of as fill if suitable or transported to designated contractor
spoil or stockpile areas .
10 .8 Foundation excavations shall be kept free of water until ei ther a seal slab or the foundati on is
placed. Any water-softened soils shall be removed prior to pour ing the foundation .
10.9 Where the locations of existing underground utilities are not known , controlled localized
excavation shall be made to identify their location prior to general excavation .
10.10 Remove all existing organic material and so il to a min im um depth of four (4) in ches .
10.11 Scarify, moisture condition , and re-compact exposed soil to a minimum depth of 12 inches.
10.12 All storm-water controls should be in spected for functiona l integrity fo llowing excavation activities
and repaired as necessary.
11. FILL I BACKFILL I COMPACTION
11 .1 All fill / backfill I compaction activities shall be reviewed to dete rm ine if ero sion control measures
are necessary. Appropriate erosion inte ri m and/or permanent controls shall be in sta ll ed as soon
as practical.
11 .2 Active dust control methods shall be implemented, as necessary, throughout all f ill I backf ill I
compaction operat ions. Dust control procedures for th is proj ect are documented in the R ust
Constructors, Chevron Piceance Project, Project Safety Plan , Fugiti ve Dust Control Plan, Re v. 1,
Procedure Number: REC-06 .
5
)
URS Chevron • Washi ngton Di vision
Date: 28Jun08 SITE PREPARATION I STABILIZATION, SOIL Doc. No. PBSR-ALLCI V-S PC-URS-
MANAGEMENT, EARTHWORK AND BACKFILL 00000-00002-00
Rev: 1 PICEANCE BASIN NATURAL GAS DEVELOPMENT Page: 6 of 8 PROGRAM
11.3 Native overburden and excavated, consisting of four (4) inches well graded maximum 15-percent
passing the No. 200 sieve, maximum liquid limit 30 -percent, and si x (6) inch maximum coarse
rock , may be used for Granular Structural Fill.
11.4 Coarse aggregate structural fill shall to be placed around finis he d pile caps.
11 .5 Top layer is to consist of % inch and smaller gravel placed at sub-grade elevation.
11.6 All fill and backfill should be placed in uniform lifts , moisture content adjusted between tw o
percent below optimum moisture content to two percent above opt im um moisture and compacted
to the following minimum percent of maxi mum dry density as determined by ASTM 0698
(standard Proctor)
A. Foundations , Skids, PDC's 95 %
B. Building Floor Sl abs 95 %
C. Condensate Storage/Produced Liquid Tanks 95 %
D. General Backfill 90 %
E. Roads storage areas and any traveled surface. 95 %
11.7 Work lay down area top layer is to consist of 18 inches of one (1) inch max imum size aggregate
base course gravel placed at sub-grade elevation.
At least 12 inches of well compacted granular fill will produce a maximum bearing pressure of
1,750 pounds per square foot (psf). Bearing pressures over 1,7 50 psf, foundation dimensions
over 60-inches or structures with settlement tolerances less than four (4) inches movement
require structure geotechnical analysis and may requi re deep foundat ions, suc h as driven pile s.
11 .8 All storm-water controls should be inspected for functional integrity fo llow ing fill I backfill I
compaction activities and repaired as necessary.
12. QUALITY ASSURANCE
12.1 All soil testing shall be performed by a representat iv e of the appropriate geotechn ical firm.
12 .2 At least one optimum moisture-maximum density curve for each class of soi l will be p repared.
The exact number of tests shall be dependent on the variation of material properties for each
class of soil, and shall be determined by the soil engineer.
12.3 Maximum densities: Determined based on ASTM 0698 , standard Pro ctor.
12.4 Quality assurance te sting during construction shall be performed us in g in -place density test per
ASTM D 1557, ASTM D 2167 or ASTM 2922 or ASTM D 4253/4254 for non-cohesive material.
12.5 Location of test will be determined be the appropriate geotechn ical firm representat ive
12.6 Minimum Test Frequency:
6
)
URS Chevron • Wa shington Di vision
Date: 28Jun08 SITE PREPARATION I STABILIZATION, SOIL Doc . No. PB SR·ALLCI V·SPC-U RS-
MANAGEMENT, EARTHWORK AND BACKFILL 00000-00002·00
Rev: 1 PICEANCE BASIN NATURAL GAS DEVELOPMENT Page: 7 of 8 PROGRAM
A. Minimum of three tests shall be performed under each facility I equipment foundation .
Additional test requirements for foundations include: One for each independent foundation or
one every 1000 square feet of each lift.
B. Under area paving and building slab areas: One every 2,000 square feet of each li ft but in no
case less than three tests.
C. Road base and sub-base: One every 2,000 square feet of each lift.
D. Trench Backfill: One test for every 50 lin ear feet of each lift.
E. General fill: One every 2,000 square feet of each lift.
12.7 Quality Assurance Te sts: When a test indicates results below specified density, the Subcontractor
shall re-compact the area to the p roper density and pay for the re-test ing expense.
12.8 Compaction test locations serve as an indication and not a guarantee that compacted areas meet
the minimum requirements , however the Subcontractors remains responsible that all soils meet at
least the minimum requirements .
13. ADDITIONAL REQUIREMENTS FOR TANK SUBGRADE
13 .1 Earth subgrade under tank subgrade shall be prepared as follows:
13.1 .1 Remove any rock found under the tank bottom or w ith in two (2) f eet (600 mm ) of the tank
bottom.
13.1.2 Sub-grade shall be proof-rolled using overlapping passed with a loaded dump truck or heavy
compactor prior to fi ll placement or construction . Any soft material encountered shall be
removed and the excavation area backfilled and compacted as by the soil Engineer.
14. GRADING
14.1 All rough grading activities shall be reviewed to determine if erosion control measures are
necessary. Appropriate erosion interim and/or permanent controls shall be installed as soon as
practical.
14.2 Active dust control methods shall be implemented, as necessary, throughout all rough grad ing
operations . Dust control procedures for this project are documented in the Rust Constructors,
Chevron Piceance Project, Project Safety Plan, Fugitive Dust Control Plan, Rev. 1, Procedu re
Number: REC-06.
14.3 Rough grading shall be installed to within a vertica l tolerance of 0.2 foot (60 mm) of fina l lines ,
grades and slopes.
14.4 Final grades shall be carried to the ljnes. grades and slopes shown an the drawings, within a
tolerance of 0.1 foot (30 mm).
7
)
URS
Washington Divi si on
Chevron •
Date: 28Jun08 SITE PREPARATION I STABILIZATION, SOIL Doc. No. PB SR-ALLCI V-S PC-URS-
MANAGEMENT, EARTHWORK AND BACKFILL 00000-0000 2 -00
Rev: 1 PICEANCE BASIN NATURAL GAS DEVELOPMENT Page: 8 of 8 PROGRAM
14.5 All storm-water controls should be inspected for functional integrity follow ing rough grading
activities and repaired as necessary.
15. ADDITIONAL REQUIREMENTS FOR ROADWAY SUBGRADE
15.1 The existing sub-grade shall be compacted by proof-rolling and any soft material removed prior to
placing fill , sub-base or base course materials
15.2 Remove any rock that protrudes above the final road bed sub-grade or above the face of the side
ditches. Tolerance for the bottom of road to be± four (4) inches from finish g rade .
8
--
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Surface Soil S lope Grades
Chevron's Piceance Basin
Natural Gas Development Program
Garfield and Mes a Counties, Colorado
\_, Env ironmenta l Reso urces Management
6455 S. Yosemite St, Suite 900
ERM Greenwood Village, CO 80111
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F:\RM106\C\Ch evron Produ cts Com pany \0071 336 ESHIA Pi ceance Basin\
Deliverables\ESHlA Report 2008 \Fina l Repor t GIS\ Vegetation.mxd
Figure 6*
GAP Vegetation Classes and Listed Plant Species
Chevron's Piceance Basin
Natrual Gas Development Program
Garfield and Mesa Counties, Colorado
Aspen Fores t Reference: *Modifi ed from Figure 4 -16 Chevron ESHIA Report G
ERM
Environmental Res ources Management
6455 S. Yosemite S t, Suite 900
Greenwood Vill a ge, CO 80111
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F:\RM1 06 \C \Chcvr on Products Compa n y\00 71 336 ESH IA Pi ceance Basin \De li vc rables\ESH IA Repor t 2008 \Final ReportG!S\Soil Eros ion .mxd
* Cowboy Chapel
!IID Hiner Gate Figure 4*
<} Study Area Soil Erosion Potential
Moderate to Very Sever e ;::,]) County Line
Chevron's Piceance Basin
Natural Gas Development Program
C3 Severe
C3 Severe to Very Severe
M Very Severe
0 1 2 3 4 cm::m--====--• Miles
Referenced : *Modified from Figure 6 -1, Chevron ESHIA Report
Garfield and Mesa Counties, Colorado
\_, Env ironmental Resources Manage ment
6455 S . Yosemite St, Suite 900
ERM Greenwood Village, CO 80111
·-
Table 1 Pro~ram Soil T2'.~
Soil Ecological Area Runoff Drainage Water Compaction
Map Soil Series Description Soil Texture Slope Potential C lass Permeability Erosion and Rutting
Unit Potential Potential
I Aga Riverbottom Sandy loam 0-3 Slow Well drained Moderate S li ght Moderate
2 Badland Ridgetops and can yon Weathered 10-65 Very rapid Well drained Very s low Very severe sides bedrock
3 Barx Rolling loam Loam 3-12 Medium We ll drained Moderate Severe
7 Biedsaw-Sunup Foothill Juniper Gravelly loams 10-40 Rapid Well drained Moderate Severe
12 Bunkwater Alka line s lopes Sandy loam 1-8 S low Well drained Moderate s low Severe
Cumu li c Gravelly sandy Well drained to Moderate to 28 Foothill Swale 1-3 Slow somewhat S light Moderate Haploborolls clay loam poorly drained moderate slow
29 DeBeque Deep loam Very channery 5-20 Rapid Well drained Moderate rapid Severe loam
3 1 Dominguez Semidesert C lay Loam Clay loam 1-3 Slow Well drained Slow Slight
32 Do minguez Semidesert Clay Loam Clay loam 3-8 Medium Well drained Slow Severe
36 Fluvaquents Ri ver bottom Loam to gravell y 0-3 Slow Poorly drained Slow Sli ght Hi gh sandy clay loam
42 Grobutte Mountain Pinyon Very chann ery 30-60 Rapid Well drained Moderate Severe loam
44 Happ le Ro lling loam Very channery 3-12 Slow Well drained Moderate Severe sandy loam
45 Happ le Loamy Slopes Very channery 12-25 Medium Well drained Moderate Severe loam sandy
Happ le-Rock
46 outcrop Rock Outcrop Sandy loam 25-65 Rapid Well drained Moderate Severe
association
52 North water-Adel Spruce/Subalpine Fir C lay loam 5-50 Medium to Well drained Moderate Severe to
complex rapid very severe
54 Panitchen Foothill Swale Loam 1-6 Slow Well drained Moderately s low Slight
55 Parachute-lrigul Mountain Lam and Loam 5-30 Medium to Well drained Moderate Moderate to
compl ex Loam y Slopes rapid very severe
56 Parachute-lrig ul-Brushy Loam and Loamy Loam 25-50 Rapid Well drained Moderate Very severe Rhone association s lopes
63 Silas loam Mountain Swale Loam 1-12 Slow Moderately Moderate S lig ht to
we ll drained very severe
Torriorthents. Well drained to
66 warm-Rock Pinyon/Juniper Un weathered 35 -90 Very rapid somewhat Moderate to Very severe bedrock excess ive ly moderately rapid o utcrop compl ex drained
67 Tosca channery Brushy Loam Loam 25 -80 Rapid Well drained Moderate Very severe
Travess illa-Rock Sand y loam to
69 o utcrop compl ex Foothill Juniper unweathered 10-35 Rapid Well drained Moderate rapid Very severe
bedrock
70 Uffens Salt Flats Loam 1-8 Medium Well drained Moderate ly s low Very severe
Very channery
71 Utso-Rock Rocky Maintain Douglas loam to 40-90 Rap id Well drained Moderate Very severe outcrop complex Fir unweathered
bedrock
Wrayha-Loam to Sandy Medium to 75 Rabbitex-Veatch Mountain Pinyon loam 45 -65 rapid Well drained Slow to mod erate Very severe
com lex
78 Youngston Loamy Salt desert Loam 1-6 Slow Well drained Moderately s low Slight to
very severe
T bl 2 D t 'I d S 'I I f r a e e a 1 e 01 n orma ion f p or roi?ram A rea
I Soil Soil Series and Elevation
Map S lope Drainage, Topography, Material Origin Veget ation
(feet)
Texture and Depths Permeability, Runoff and Erodability Land Use and Ecological Site Class
Unit
The surface layer is typi cally brown very fine sandy loam, Permeability is mod erate in the upper part of th e
about three-inches thi ck. The n ext layer is pale brown very Aga soil and rapid in the lower part . The The ecologic al areas where this soil is
Aga very sandy This deep, well d rained soil is found on ri ver terraces and The na ti ve vegetat ion typicall y found gro win g in this soil is fine s andy loam. about fo ur-in ches thi ck. The upper 13 inches avai lable water capac ity is low . The e ffecti ve primari ly found is d escribed as Ri verbottom.
1 loam, 0 to 3 percent floodp lai ns. It is found as alluvium deri ved from a variety o f cottonwood, western wheatgra ss, slend e r wheatgrass, skunkbus h 4,500 to 6,000 o f the underl yin g m aterial is brown very fine sandy loam. The rooting d e pth is 60 inches o r more. Runoff is This unit is used mostly for grazing, as
s lopes sources. sumac, w ill ow and many forbs. nex t eight inches is pale brown loamy sand. The lower part of s lo w, and the ha zard of water is s light. The soil is wildlife habitat , or as a source for sand and
th e s ubs tratum, to a d epth o f 60 in ches or more, is variegated s ubjec t to occasional fl ooding for brief period s g rave l.
extremely grave lly sand. during th e year.
This soil unit is found on s teep , ne arly ba1Ten mountainsides, low The use for development on these soil s is
2 Badland , I 0 to 65 hills, ridgetops, and canyon sid es . It is res iduum d erived from The native vegetation typi ca ll y found growin g in thi s soil is mainly 5 ,200 to 7,200 The Badland so ils are very sh all ow and exhi bi t n o s ignificant Permeability is very s low and runoff is very very limit ed due to the s lope, the shrink-swe ll
percent s lopes hi g hly ca lcareous and gypsiferous sh ale and bentonite. sparse low d ese1t shrubs and grasses. soil characteri s ti cs . rapid, with eros ivity be ing very severe . potential, and the s usceptibility to mass
s lo ughing.
The native vegetation typ ica ll y found growin g in thi s s oil is mainly
western wheatgrass, need leandthread , bottlebrush squirreltail , The s urface layer is typically is brown loam, about three-Penneability is moderately s low in th e Barx unit. This un it is u sed for li vestock g raz in g o r as
Barx loam , 3 to 12 This deep, we ll drai ned soi l is fo und on stnactural benches. It Sand berg bluegrass , and Wyoming big sage brush . Other less inches thick. The upp er 11 inches of the subso il is reddi sh The avai la ble water capacity is high. The w ild life habit at. The ecolog ical areas where 3 perce nt slopes formed in eolian deposits developed from a va ri ety o f base extensive grasses are Indi an Ricegrass and prairie Junegrass. 5,000 to 6,400 brown clay loam. The lower 26 in ches is a pink loam . The effecti ve rooting depth is 60 inc hes or mo re. this soi l is primarily found is described a materials. O vergraz ing result s in the in creased presence o f forbs and substra tum , to a depth o f 60 in ches or more, is li g h t redd ish Runoff is med ium, and hazard o f wa te r erosion is
sagebrus h. With furth er degradati on, encroac hment occu rs with the brown loam. severe. Ro lling loam .
presence o f c heatgra ss, juniper, annual bullercup, and other ann ua ls.
The Bied saw soil is d eep and well drai ned. It formed in
colluvi um over residuum deri ved mainly from the Wasatch
shale fom1ation . Typically, the surface layer is b rown grave ll y Permeability is slow in Bied saw soi ls. The
The native vegetat ion t ypica ll y foun d growi ng in this soil is juniper, loam, about four-inches thi c k. The upper five inches of th e avai lable water capacity is high . The effecti ve
shadsca le saltbush, greasewood, ephedra, yucca, and Indi an s ubsoil is brown loam. The next 10 inches is pa le brown clay rootin g d e pth is 60 inches or more. Run off is
Bi edsaw-S unup Ricegrass. The soil also has the potential to s ustain n ati ve loam. Be low this is 24 inches of weak rea d clay loam. The rapid , and the ha zard of eros ion is severe. This unit is used for li ves tock gra zin g or as
7 gravell y loam s, I 0 This soi l unit is found on the sid es o f mountains and ridges. vegetation comprised o f Utah juniper and an und erstory of galleta, 5 ,100106,600
lower part of the subsoil , to a d epth of 60 inches o r more, is wildlife h a bitat. The ecological area
to 40 percent s lopes bottlebrus h, squirre lt ail , and bluebunch wheatgrass. With dark reddi sh g ray and light browni sh gray s ilty c lay loam. descripti on for unit of thi s type soil is Foothill
overgrazing a d ec rease in the presence of bluebunch wh eatgrass and The Sunup soil is shall ow and we ll drained . It fom1ed in th e Juniper.
juniper will occu r while Wyom ing big sagebru sh and cheatg ra ss coll uvium and res iduum of th e Wasa tch fo rn1ati o n . The Pern1eabi lity of th e Sunup soi l is moderate. The
wi II in crease. s urface layer is usua ll y brown gravelly loam, about four-in ches ava il able water capacity is very low. The rootin g
thick. The under lying materi al is brown very gravell y loam, depth is I 0 to 20 in ches . The runoff is rapid and
about seven-inches thick. Sands ton e is fo un d at a depth of erosion is severe.
about 11 in ches.
Typicall y, th e surfa ce laye r is p ink very fin e sa ndy loam, ab out
two inch es thick. The up per fi ve in ches o f the subsoil is
Bunkwater very This deep well drained soil is fou nd o n structura l benches. It The na tive vegetat io n typ ica ll y found g rowing in this soil is reddis h brown clay loam . Below thi s is s ix inches of li gh t Permeability is moderately s low. The avai la b le The eco logica l area where thi s soil is greasewood, sagebrush , grasses, and forbs . The soil a lso has the reddis h brown clay loa m . The next 20 in ches is a lso a li ght water cap aci ty is moderate, with th e root d e pth 12 fine sandy loam , I formed in eoli an materi al derived dominantly from a va ri ety of potenti al to hos t plant communities o f western wheatgrass, ga ll eta, 5,000 to 6,000 redd ish brown c lay loam. The upper part o f th e s ubsoi l is light being 60 inches or more. Run off is s low and primarily found is d escribed as Alkaline
to 8 percent s lopes mixed materia l. s h ad sca le salt bush , and Wyom in g big sagebna sh. brown cl ay loam, about nin e in ches. The lower part o f th e eros io n is severe. S lopes.
s ubstratum, to a depth of 60 inch es or more, is li g ht brown s ilty
clay loam .
The surface layer is dark grayish brown gravelly sandy clay
The vegetati on typicall y found in areas th at are not culti vated is loam , a bout eight-inches thick. The next layer is a 12 -in ch Pennea bility is moderate lo moderate ly s low.
mainly narrowleaf cott onwoods, maples (boxelders), wi ll ows, thi ck grayish brown , very c hannery sandy clay loam . The The available wa ter capac it y is low to hi gh . The This unit is used fo r cattle grazing and
Cum ulic These a re deep, well drained to somewhat poorly drained so il s grasses, and forbs. The soil a lso h as th e potentia l to su stain plant s ubsoil is grayish brown clay loam, about e ight-inc hes thi ck. effective rooting depth is 60 in ches o r more. w il dlife habitat. Forage crops are grown if
28 Haploboro lls, I to 3 arc typically fou n d on ripari an zone. 1l1ey forn1ed in alluv ium species consisting o f n arrow leaf collonwood s, with an understory o f 5,800 to 7,400 The upper part of the substratum is light brown is h gray, ve ry Runoff is s low and water erosion is s li ght. These irri ga tio n is p racti ced. The ecological area
pe rce nt s lopes from the Green River and Wasatch Fo m1 ation s. western wh ea tgra ss, basin wildrye, basin big sage brush , and m any grave ll y loamy sand, a bo ut 16-inches thi ck. The lower part of soi ls are subjec t to annual floodin g in th e spring category where thi s so il is primarily fou n d is
forbs and shrubs. th e su bstratum , to a depth of 60 inch es o r more, is yell ow, very and s ummer from snowmelt and inten se desc ribed as Foothill Swale.
gra ve ll y sand. In some areas th e surface layer is loam or s ilty thund ers tonns.
clay loa m.
The na tive vegetat ion typicall y fou nd growing in this soil is mainly Typica ll y, th e surface layer is very dark grayish brown very
Debeque very This deep, well drain ed soil is found o n toes lopes, in narrow serviceberry, sn owberry, g rasses, forbs an d sporadic Rocky chann ery loam, about four-inc hes thi ck. The next layer is Pem1eabi lity is moderately rapid in th e De Beque This unit is used for li vesto ck grazing and
29 chann ery loam, 5 to drain age ways, on a llu vial fans, and o ld stream terraces. It Mountain Douglas-fi r. The soi l also has the potenti al to host plant 5,800 to 7,500 brown , very c hannery sandy loam, about three-inches thic k. soil. The avail ab ili ty of waler capacity is low. wil dlife h a bitat. The ecological area category
20 percent s lopes fom1ed in collu vium and all uv ium from th e Green River s ha le commun iti es of western whcatgrass, mullongrass, p rai rie Ju negrass, The underlyin g material, to a d epth of 60 inches or m ore, The effective root in g depth is 60 inches or more. w here thi s soi l is primarily found is described
forma ti on. and mountain big sagebru sh . lf th e area is overly disturbed, an consists of a light brownish g ray ve ry channery s a ndy loam. Runoff is rapid and water erosion is severe. as Deep Loam .
increase is seen in big sagebrush and fo rb s.
The nat ive veget ation typicall y found growi ng in thi s soil is The s urface layer is reddish brown cl ay loam, abo ut three-Pe m1eability is s low in the Dominguez so il. Th e
sagebrush, wes tern wheatgrass, and s hadscale sahbush. The so il inches thi ck. The upper part of th e subsoil is reddish brown available water capacity is moderate. The
Domin guez clay This deep well drain ed soil is found on a ll uvial fan s and also has th e p otential to hos t plant comm unities of wes te rn clay, a bout 14-in ches thi ck. The n ext part of th e s ubsoil , a effecti ve rooting d epth is greater th an 60 in ches. This uni t is used for livestock graz in g. The
31 loam , I to 3 p ercent toes lo pes. It is fom1ed in residuum and all u vium d e rived from wh eatgrass, Salin a wildrye, Sand berg blu egra ss, Wyoming big 5,000 to 6,400 Pem1 eabi lity is s low in th e Dominguez so il. The ecolog ic al s ites where this soil is found is
s lopes th e Wasatch shales. sagebrush, and sh adscale sahbus h. If overgra zed the presence of reddi sh g ray clay layer, is about 13-inches thi ck. The lower available wa ter capac ity is moderate. The described as Sem idesert C lay Loam.
western wheatgra ss, Indi an ri cegrass, and Salina wildrye will part o f the subsoil, to a depth of 60 inches or mo re, is pinkish effec ti ve root ing d epth is greater than 60 inches.
d ecrease, and Wyom ing bi g sagebrns h will in crease . gray clay. Runoff is s low, and water eros ion is s li ght.
~ -· .. . . ' .. .
loam, 3-to 8 p e;cent
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32 toes lopes . It is fom1ed in residuum and all uvium d eri ved from sagebrus h, western wheatg ra ss, and sh adscale sa lt bus h. The soil 5,000 to 6,400 in ches thi ck . The upper p art of th e s ubsoil is reddis h brown availa b le water capa ci ty is moderate. 1l1e ecolog ical s it es wh ere thi s soil is found is
slopes the Wasatch shales. a lso has the potenti a l to h os t p lant communities of weste rn clay, a bo ut 14-inches thi ck. The n ex t part of the s ubsoil , a effective rooting d epth is greater th an 60 in ches. d escri bed as Semi desert C lay Loam .
l of4
Soil Soil Series a nd Elevation
Map Slope Drainage, Topography, Material Origin Vegetation
(feet)
Texture and D e pths Permeability, Runoff and Erodability Land Use and Ecological Site C l ass
Unit
wh ea tgrass, Sa lina wild rye , Sandberg blu egrass, W yoming big reddish g ray clay layer, is about 13 -in ches thi ck. The lower Pem1eability is s low in th e Doming uez soil. The
s agebrush, and sh ad scale saltbu sh. If o ve rg razed the presence of part o f th e subs o il , to a de pth of 60 inches or more, is pinki sh ava ilable water capacity is moderate. The
western wheat grass, Indian ri cegra ss, and Sal in a w ildrye will gra y clay. effec ti ve rooting depth is greater th an 60 inch es.
decrease, and Wyomin g big sagebrush will increas e. Run o ff is medium , and water erosion is se ve re .
These are stratified and vary widely in texture and de pth to
This map un it cons ists of dee p , poorl y drained , nearl y le ve l s oils sand , gravel, and cobbles . A common profile has a su rface The water table varies between su rface and a This map unit is primarily u sed for wild li fe
Fluvaquents, 0 to 3 Plan ts in the un it cons ist of hydro ph ili c s pec ies, su ch as layer of loam, about t wo-inches thi ck. The unde rlying layers depth of 12 in ches durin g period s of s pring runoff habitat , recreation al purposes, or c attle 36 percent slop es on fl ood p lains and first terraces. These so il s fom1 ed in cotton wood , wi ll ow, wa ter to lerant grasses, sedges, and rus h es. 4 ,800 to 6, I 00 are strat ified sandy loam, loamy sand , s ilty clay lo am, gra ve ll y from snowmelt. Thes e soils experience period s gra zin g. The ecological sites wh ere th ese a llu vium. loam, and very gravell y loamy sand . In some areas g ravel and o f flooding late in spring and earl y summer. soil s are fo und are classified as Riverbottom .
cobbles are on or near the surface.
The native veget ation typica ll y found growing in thi s soil is shmbs
and gras s. The soi l a lso has th e potenti al to host p lant communities
inc lu ding an overstory of twoneedle pinyon , wheatgrass , true Permeability is moderately rapid. The availab le This un it is used m ainly for li vestock gra zin g, Grobutte very This deep , we ll dra ined so il is found o n s tee p hill s and mountain mahogany, moun tain bi g s agebru sh , and Gambe l's oak; Typi cally , th e s urface layer is g ray ish brown very chann ery wat er capacit y is low. The effecti ve rooting wi ldlife h abi tat , or wood prod u cti on. The 42 channery loa m, 30 mountains id es. It fom1ed from coll uv ium d eri ved fro m mi xed and an und erstory of bluebun ch whe atgrass, wes tern wheatgrass, 6 ,0 00 to 8,000 loam, about fou r-inc hes thi ck. The unde rly in g materia l, to a d epth is 60 in ches or greater. Runoff is rapid , and eco logica l areas where these soils are found to 60 p ercent s lopes material s. and muttongra ss . If range co nditions deteri o ra te as a result o f d e pth of 60 in ches or more, is li g ht gray, ch ann ery loam wat er eros ion is very severe. a re desc ribed as Mountain Pinyon. overgraz in g the prese nce of Gambel' s oak, t woneedle pin yon and
fo rbs increase . En croa chment of Ca n ada thistle, c heatg rass, and
rabbitbru sh may be proble m if o ve rg ra zin g ad vanc es.
The nat ive vegetati o n typi ca ll y found grow ing in thi s soil is S urfa ce texture is li ght g ray very channery s andy loam , about s agebrush, grasses, and fo r bs. The s oi l also has th e potential to host seven-in ches th ic k. Subsurface tex tures of th e s ubsoil are a This unit is used for cattle g razing.
Happle very These deep, well-drained s oil s are fou nd on a ll uv ial and colluv ial plant communit ies o f wes tern wheatg rass, n eedle andthre ad, very pale brown , very channery s andy loam, ab o u t seven -Pem1 eabi lity is moderate in the Happle s oil. The Additi onall y, if water is avai lable, th e unit
44 ch ann ery sandy fa n s and toe slopes; formed in co llu vium and alluvium d eri ved bottlebrush squ irre ltail , Sandberg blu egra ss, Wyoming big 5 ,2 00 to 6,200 in ches thi ck. The next part of th e subsoil is li ght g ray, very avai lable water capacity is low. The effective can be used for g ro wing h ay and pastu re
loam, 3 to 12 sagebrush and, to lesser extent, rabbitbrush and fo rbs. If grazing root ing de pth is 60 inches or more. Runoff is g ra zing. The ecolog ical areas wh ere th ese
percent s lo pes dominantly from th e Green Ri ve r shale fom1 ati o n . conditi on s deteriorate , the presence of forbs, low rabbit b ru sh , and ch annery s andy clay loam , abou t 18-in ches th ick . The lower s low , an d th e hazard for water erosion is se vere. soils are found are described as Rolling Loam part of th e und erlying materia l, to a de pth g reat er than 60 Wyoming big s age brus h increase. Further, Utah juniper and in ches, is li g ht gray extremely channery coarse s andy loam . ty pe.
cheatgrass will in vade if additi ona l dis turbance occurs.
The n ative vegetation typically found growing in thi s soil is
sagebrush, grasses , and forbs . The soi l also has the potentia l to host Su rface texture is li ght gray, ve ry chann ery s andy loam , about
Happle very p lant communiti es includin g b lu ebunch wheatgra ss , seven in ches thic k. Subs urface textures of th e su bsoil are a Pem1 eabi lity is moderate in the Happle soi l. The This unit is used for catt le grazin g or wi ldlife
channery sand y This deep, well -drai ned soil is found on a llu vial and coll uvial needleandthread , wes tern wh eatgrass, Indi an riceg rass , true very pa le brown , very cha nne ry sandy loam , about s eve n available water capacity is low. The effec ti ve h abi tat. The ecolo gica l areas where these 45 loam , 12 to 25 fa ns and toeslopes; form ed in coll uvium and a ll uv ium d eri ved mountain mahog an y, and Wyoming big sag ebrush and, to lesser 5,400 to 6 ,2 00 inches thi ck. The n ext part is li ght g ray, ve ry ch annery sandy rooting d e pth is 60 inches o r more . Runoff is so il s are fou nd are described as Loa my S lop es
perce nt s lopes dominant ly from th e Gree n Ri ver shale fomiati on. extent, muttongrass and forbs. If gra z ing co nditi ons deteriora te, th e clay loam , about 18 inch es thi ck. The lower part of th e med iu m, and the hazard for water eros ion is type. presen ce of grasses wi JI decrease, and forbs and s h rub s w i II underlyi ng materi al, to a depth g rea ter than 60 in c hes, is light seve re.
increase. Furthe r, Russ ian th istl e and cheatgrass w ill in v ade if gray extremely ch annery coarse sand y loam.
ad d it iona l di stu rb an ce occ urs .
This map unit is located o n s ide s lopes an d c an yo n rims. Typ ica ll y, the surface laye r is li ght gra y, very ch ann ery sandy
loam, about seven inch es thick. The upper part of th e
This unit is about 50 percent Happle, very channery sandy loam , The nati ve vegetation ty picall y found g ro wing in this so il is subs tratum is very pale brown, very c hann ery sandy loam,
and 35 p ercent Rock outcrop. The Happle so il is found on the s agebrush , grass, and forbs. The Happle soi l also h as th e potential to about seven inches thi c k. The nex t part is light g ray, ve ry This un it is used for lives tock grazing or as Happ le-Rock lo wer part o f the s lopes and the Rock outcrop is fou nd on the host plant commun iti es of Indi an ricegrass, western wh eatgrass, channery s andy clay loam , about 18 in ches th ick . The lower Permeability is mod erate in the Happle soil. The w ildlife h a bitat. No ecologica l area is
46 outc rop assoc iati on, u pper part. b o ttlebrush squirreltail , shad scale saltbush, and W yoming big 6,200 to 7 ,200 part of th e s ubs tratum , to a de pth of 60 inches or m ore, is li ght av ai la ble water capacity is low. The effec ti ve assigned for the Rock out cro p. The Happ le 25 to 65 percent Included in mappin g are sm all areas o f soil s that are s imil ar to sagebrush . If range cond iti o ns d ecl in e as a res ult of overgrazing , th e gray, ex treme ly c han nery coarse s andy loam. rooting d e pth is 60 in ches o r more. Runo ff is soil is in th e Stee p C olluvial S lopes slopes th e Happ le soi l bu t are shall ow or mod erately d ee p. Al so proportion of palatable gra sses decre ases and Wyo m ing big Rock outcrop o ccurs as hori zontal band s 20 to 80 feet hi gh
rapid, and th e hazard of water eros ion is s evere. ecolog ic a l area.
included are s mall areas of De Beque very channery lo am . The s agebru sh and forb s in crease. alon g canyon rims and as buttresses extend ing in t o areas of th e
Happle so il is d eep and we ll drained . It form ed in co llu vium Happle soil. The buttresses make u p abo ut 10 percent o f th e
deri ved dominantly from the Gree n River sha le fom1a ti on. Rock outcrop .
This map unit is found o n mountai ns ides and foot slopes and in
The Northwater soi l also has th e potential to hos t p lant communiti es Pe m1eabil ity is moderate in the Northwater s oi l. Most areas of thi s unit are used for li ves tock swales. This unit is about 50 percent No11hwater s oil and 40 Typic a ll y, the surfa ce layer is dark grayish brown loam , about
percent Ad el soi I. o f m ainly quaking asp en and an und ers tory of s lender wh eatgrass, 28 in ches thi ck. The s ubs oil is ye ll ow ish brown very ch annery The av ail able water capacity also is moderate. g razin g, wood products, or wildli fe habitat.
n odding brome, mountain brom e, Co lumbia need legra ss, mountain loam , abo ut 20 -inchcs thick. The subs tratum , to a d e pth of 60 The effecti ve rooting depth is 60 inches or mo re.
The Northwate r s oil is located on mountain sid es. The snowberry , and many forb s. Areas of this so il can be of very of Ru noff is medium or rapid, and the hazard o f The Noi1 h water s oi l is in the Quaking Aspen
North wat er-Adel Northwater soi l is d ee p and well drain ed. It fom1 ed in residuum va lu able qua lity for g ra zin g of li vestock. inch es or more, is ye llowi sh b rown, extreme ly ch annery loam . water eros ion is severe or very severe . eco log ical area.
52 complex, 5 to 50 and co ll uv ium deri ved d ominant ly fr om sedim entary rock . 7, 700 to 8 ,400
percent s lopes The Adel soi l h as th e po tential to host plant commu nities including Permeability is moderate in th e Ad el soil. The
The Ade l soil is fou nd on foots lopes and in swales. The Ad el s oi l subalpine fir and En gelmann's s pruce and an un derstory of e lk T yp ica ll y, th e s u rface layer is dark grayish bro wn c la y loam , avail ab le water capacit y is high. The effec ti ve
is dee p and well drained. It form ed in coll uvium d eri ved sedge, grouse whort leberry, heart leaf amica , and s il ve ry lupin e. The about 20 -in ches thick. The subso il is brown clay loam , a bout rooting depth is 60 inches or more. Runoff is The Ad e l soi l is in th e Engelmann's Spruce
dominantl y from sedi mentary rock. Adel s oil genera ll y supp ort s quaking as pen and an understory o f I I in ches thi ck . The subs tratum, to a depth of 60 inches or medium, and th e hazard of water erosion is severe Subalp in e Fir ec olog ical area.
s lender wheatgrass, n odding brome, Columbia necdlegrass, more, is brown c lay loam.
mo untain s nowberry, and blue wildrye. or very severe.
2of 4
Soi l Soil Series a nd E levati on M ap Slo11e Dra inage, To p og r a phy, M a te ria l Origin Veget a ti o n
(feet)
T exture and De pths P ermeabili ty , Runoff and Er od a bility La nd Use a nd Ecolo gical Site C la ss
Unit
The native vegetati on typ ically found g rowin g in this so i l is m ai nly
gra ss and shrubs. The soil also h as th e potent ial to host plant
communit ies o f bas in wi ldrye, wes tern wheatgrass, strea mbank T ypically, the su rfa ce layer is li ght g ray loam , abo ut seven-Permeability is moderate ly s low in the Panitchen This unit is used fo r lives tock grazing,
Pan it chen loam, I This deep, well dra ined soil is fo u nd o n low terraces and fl ood wh eatgrass, and basin b ig sagebrush . If ra nge condi tion s d ecline as inches thick. The upper part of th e underlying mate ri a l is pale soil. The avai lab le water capac ity is moderate. irrigated hay land , or p asture. This unit is in 54 to 6 percent slo pes plain s. II formed in alluvium d eri ved dominant ly fro m mixed a r esul t of ove rgrazin g, the presence of rubber rabbitbru sh and basin 4,800 10 5,800 brown , stratified g ra vell y loam and grave ll y clay loam, about The effec tive roo tin g depth is 60 inches o r more . th e Foothill Swa le ecolog ical area . materia ls. big sagebrush increase. If cont inued dete riorati o n is a ll owed , 22 in ches thi ck . The lower p art o f th e substratu m , lo a dep th of Runo ff is s low, and th e hazard of water eros ion is
cheatgrass, greasewo od , Kent ucky bluegrass, cac tus, lambsq ua11er, 6 0 inches or more, is li ght yell o wis h brown , s trat ifi ed loam. s li g h t or moderate.
mus tard, an d broo m s nakeweed in vad e and severe gull y e ros io n can
occ ur as a res ul t of th e lack o f ground cover.
This ma p unit is fou nd on moun tain ridges and on the crests and The Parac hu te so il a lso h as th e poten tial 10 host pl ant co mmunities Permeability is moderate in the Pa rachu te so il. s id es of hills . Thi s unit is about 60-p erce nt Parachute so il and 30 of main ly Ari zon a fescue, Colum bia needl eg rass, s lender Typicall y, th e s urface layer is grayish brown lo am , ab out 10 -
p ercent lrigul s oil. wh ealgrass, Lettem1an's n eed legrass, and mountain bi g s agebrush . inches thick . The subsoi l is brown very chann ery loam, abo ut 111 e ava i I ab le wa ter ca pac ity is very low. The
The Parachute soil is moderat ely d eep and is well drained. It If range condition s decline as a res ult of overgra zing, th e presence 15-inch es thic k. Ripp able, fractured s i lts tone is fo u nd at a effec ti ve ro oting de pth is 20 to 40 inc hes. Runo ff
forn1 ed in resid uum deri ved d ominantly fro m sandston e, o f less p alatab le grasses, s uc h as b ott le brus h s qui rrelt ail , forbs, and d epth o f a bout 25 inches. is medium or rapi d , and the h az ard of wat er
This un it is u sed for livestock g ra zin g. Parach ute-lri gul s i lts ton e, or hard shale. most o f th e s hrubs increase. eros io n is mod erate to very severe.
55 complex, 5 to 30 7 ,600 to 8,800 The Parachute soil is in the Mounta in Loam
percent s lopes The lrig ul soil also h as the potent ia l to host plan t communiti es of eco logical site, and the lrig ul soil is in th e
mainly western wheatgrass, pra irie J w1egrass, bluebun ch T yp ically, the s urface layer is brown c hannery loam , a bout s ix-Pe rn1eabi li 1y is moderate in th e lrigul soi l. The Loamy Slopes ecolo gical s it e.
The lri g ul soil is sh all ow and we ll drained . 11 formed in residuum wh eatgrass, Sas katoon servi ceberry, and mountain bi g s ag e b ru sh . If inches th ic k. The s ub soi l is brown ve ry c hannery lo am, about ava ila b le water cap ac ity is ve ry lo w. The
deri ved d om inantly from sandston e o r h ard sh ale. range cond itions d ec lin e as a res u lt o f overgraz in g, th e p resence of seven -inches th ick. Hard s ilts to ne is encoun tered a t a d epth of e ffective rooti ng de pth is I 0 to 20 in ches. Run o ff
for b s, rabbitbru sh , mountain bi g sagebru sh , mounta in s now b erry, a bo ut 13 in ches. is med iu m or ra pid, and th e ha zard o f wa te r
and Saskatoon serviceberry wi ll increase. eros ion is m oderate to very severe
This map unit is located on tops o f mountain s and ridges and on
the crests and sides of h ills. This unit is about 35 p ercen t
Pern1 eabi li ty is moderate in the Parach ut e soi l. Parachute lo am , 30 percent lri g ul ch annery loam , and 20 percent T ypicall y, th e s urface layer is grayish brown loam , abo ut 10
Rhone loa m . The na ti ve vegetation t yp ically found growin g in this soil is inch es thi ck. The su bsoi l is brown ve ry ch annery loam, abou t The av aila ble water capacity is very low. The
The Parachute soil is foun d on no11h-and wes t-fa c ing side
Gambe l's oak, serv iceberry, sagebrush , and grasses. The Parachu te 15 in ches thi ck . Rip pable, fractu red s ilt stone is found a l a effect ive ro oting dep th is 20 to 4 0 in ches. Runo ff
and Rh one so il s a lso have th e poten ti a l lo host plan t communities o f is rapid, and th e hazard of water eros ion is very s lopes, t he lrigul soil is located o n ri dges and sou th -and east-ma inl y western wheatgra ss, nodding bro me, mountain b rome, e lk dept h o f abo ut 2 5 inches . severe.
fac in g side slopes, a nd th e Rh on e soil is typ ica ll y encountered on sedge, s lender wheatg ra ss, Saskatoon serviceberry, and m ountain The Parachut e and Rhone soils are in th e Parachu te-lrig ul-to es lopes. sn ow berry . If ran ge cond iti on s decl ine as a res ult of ove rg ra zing, Bru shy Loa m eco log ical area. The lri gu l soil
56 Rhone assoc iati on , the presence of forbs, mount ain big sagebrush , Sask ato on 7,800 to 8 ,800 T ypica ll y, th e s u rface layer is brown ch annery loam , a b out s ix-Permeability is mod erate in the lrig ul so il. The is in th e Loamy S lopes ecolog ica l area. 25 lo 5 0 percent The Parac hute soil is moderately dee p a nd is well drained . It serviceberry, and mountain snowberry in crea se. Some areas support ava il able wa ter capacity is ve ry low. The
s lo pes fom1ed in co lluvium and res iduum d eri ved d o minantl y from a few Gambel's o ak t rees. The lrigu l soi l has th e potent ia l to host inch es th ick. The su bs oil is brown ve ry channery loam, about effecti ve rooting d epth is l 0 to 2 0 inc hes . Runo ff This un it is used fo r li v estock gra zing or as
sands tone, siltstone, and hard sh ale. plant communities o f m ain ly western wheal grass, prai ri e Jun egrass, seven-inches thi ck . Hard sha le is fou nd at a de pth o f abo ut 13 is rapid, an d the hazard of water eros ion is very w ild life h a bi tat.
inches. blu e bun ch wh eatg rass, bo tt le bru sh squirrelt ail, and mountain bi g severe.
The Lrig ul so il is s hall ow and we ll drained . It fo rn1 ed in res idu um
s agebrush . If range co nditio ns d ec lin e as a res u lt of o verg razing, the
T y picall y, th e s urface layer is very d ark gray ish brown loam , Permeab ility is mod erate in the Rhone soil. The presence o f fo r bs, mo untain b ig sagebru sh , Sas katoon s erviceb erry,
derived dominant ly from s and sto ne or h ard sh ale. and mountain snowberry increase. about I 0 inches thick . The next layer is d ark grayis h brown avai la ble water ca pac ity is mod erate. The
c hann ery loam , a bout 2 9 inches thic k . The s ubsoil is brown e ffec ti ve rooting depth is 40 to 60 inch es. Runoff
The Rh one so il is deep and well d rained . It fann ed in coll uvium ve ry c hannery loam , abou t 16 inches thic k. Rippa ble, fra ctured is rapid , an d the ha zard of water eros io n is very
and residuu m deri ved dominantly from sands tone or hard sha le. s iltstone is fou nd at a dep th of ab out 55 inch es . severe.
The n ati ve vegetati on typicall y found growing in this s o il is Pern1 eabi lity is moderate in th e Si las soil. The sagebrus h, grasses, and for bs. The soil also has the poten tia l to hos t T ypicall y, th e s urface layer is dark gra yish b rown loam, about ava ilable water capac ity is high . The effect ive pl ant communities o f basin wildrye, wes tern whea tgrass, C ol umbia
Si las loam, I to 12 This deep, moderate ly well d rain ed soil is fou nd on alluv ial need legrass, slender wheatgrass, and mountain big sagebrush. If 18-inches thi ck. The upper part of the underlyin g m ateri al is rooti ng de p th is 60 in ches or more. R uno ff is This unit is used for lives tock g ra zing or as
63 percent s lopes vall ey floors. It fonned in all uvium d eri ved dom inant ly fro m range condit ions decline as a res ul t of overgraz ing, th e presence o f 7 ,800 to 8,400 d ark gray ish brown clay loam , about 27-inches th ick . The slow , and the hazard o f water erosion is s lig ht to w i ld life habitat. This u nit is in th e Mou nta in
mixed sedim e nta ry roc ks. mountain big sage bru sh and the less p ala table forb s inc rease. If lo wer part of th e s ub stratum , to a de pth of 60 inch es o r more, is very severe. The less s lop in g areas are subj ec t to Swale ecolog ical site.
contin ued dete rio ratio n is allowed , chea tgrass, th ist le, m u st ard , g ray ish b rown clay lo am. fl ood in g as a res ult of rwi on fro m th e s urro unding
dandeli o n , annual weeds, and Kentu cky b lueg rass invad e. s teepe r areas.
This m ap u ni t is fo un d on stee p, main ly sout h-fac ing slopes of The nati ve vegetat io n ty p ica ll y fo un d growing in this so i l is s parse
mo unt ain s, hi ll s, rid ges and c an yo n sides in extremely roug h and shrubs and grass and some t wo needle pin yo n and j u nip er. P lant
eroded areas . sp ec ies at the lower elevation s o f thi s u ni t in cl ud e S alin a wi ldrye, No s ing le pro file is typi ca l o f To rrio rthe nts, but a comm on M ost areas o f thi s uni t ar e u sed as w i ld life This un it is about 50 percent To rri ort hen ts and 40 percent Rock Ind ian r icegra ss, blue b un ch wh eatg ra ss, forbs, shadscale sa ltbush , p ro fi le h as a sur face laye r o f pale brown channery loam , about h a bitat o r for limited lives tock grazin g . A few Torrio11h ents, o u tcrop. Wyoming bi g sagebru sh , s mall low ra bb itb ru sh, p lains pri ck lyp ear, t wo-in ches thi ck . The und erlyin g materia l is very c h ann ery Pem1e abi li ty is mod erate or moderate ly rapid in areas are used fo r the d evelopmen t of coal wam1-Rock Roc k outc rop consists of b arren escarpments, ridge caps, and and prairie Jun eg rass and a th in oversto ry o f Utah j unip er. P lan t loam, about 11 inches thick. th e T o rrio rthents . The ava i la ble water cap ac ity is and natura l gas. Li ves tock grazing is limited 66 o utcro p comple x, rocky points o f sand stone, sha le, limes tone, or siltsto ne. The species at the uppe r elevation s in clude western wh ea tgrass, S ali na 5, I 00 to 6,200
Sands tone is fo und at a depth o f about 13 inch es. ln some
very low to moderate. The e ffec tive rooting de pth becau se o f th e sparseness o f vegeta tio n , th e 35 to 90 p erce nt escarpment s commonly are three to 50 feet high and 25 to 2,500 wi ldrye, forbs, Wyoming b ig sageb ru sh , shad sca le saltbu sh , Utah is 4 to 60 in ches. Run off is very rapid , an d th e
s lo pes feet lo ng. serviceberry, Ind ian r icegrass, and Gambe l's oak , and a thin areas the s urfa ce layer is sto ny o r fl aggy. De pth t o sh ale or h azard of water eros ion is very severe. s lo pe, and res tricted accessibility. The
T orri orthen ts comm on ly are very sha ll ow to d eep over h ard or overstory o f Utah j un ip er. If th e condi tion of th e ran ge d eterio ra tes, san ds tone ranges from fou r to 60 in ches. The soils are T o rriorthents are in the Pinyon J un iper
s oft b edrock . These soil s are well drained to somewhat th e port ion o f shrubby s pecies an d trees inc rease. If th e ran ge ca lca reous thr o ugho ut. ecological area.
excessive ly drained. They fonned in residuum and coll uvi um con dition cont in ues to d eteri orate, cheatgra ss and R uss ian thist le
d erived from sandstone, sha le, limesto ne, or s ilts tone. invade.
3of 4
Soil Soil Series and Elevation Map Slope Drainage, Topography, Material Origin Vegetation
(feet)
Texture and Depths Permeability, Runoff and Erodability Land Use and Ecological Site Class
Unit
Typi ca ll y, th e s urfa ce layer is dark grayish brown c ha nnery
The nati ve vegetati o n typicall y fo und growi ng in this soil is loam, about e ig ht -in ches thick. The next layer is brown very Pem1eability is moderat e in the T osca so il. The
Tosca chann ery This d eep, we ll drained soi l is found on mo unt ain side s lopes and serv ice berry, Gambel's oak , snowb erry, and gra sses. The soi l also ch ann ery loam , abou t seven -inches thi ck . The upper part of th e available water capacity is low. The e ffecti ve This unit is u sed for li ves tock g razing o r as 67 loam, 25 to 80 foots lopes. It formed in collu vium deri ved domin antly from has th e p o tenti al to host pl ant comm un it ies o f Gambel's oak, 6 ,200 to 8,500 s ubsoi l is brown ve ry channery loam, about nin e-inch es thi ck . rooting d e pth is 60 in ches or more. Runoff is
percen t slo p es Green River shale. Sas kat oon serviceberry, mountain s nowberry, slender w heatgrass, The lower part o f th e s ubs tratum , to a d e pth o f 6 0 in ch es or rapid, and th e ha zard of water erosion is very w ild life habitat. This un it is in the Bru sh y
nodding b ro me, mountain brome, and e lk sedge. more, is very p ale b ro wn and light ye llowish brown , very severe. Loam ecol ogical area.
ch annery loam.
The nati ve vegetation typi call y found g rowin g in thi s soi l is Ut ah Pem1 eability is mod erat ely rapid in the
Travess illa-Rock This map unit is fo und on di ssec ted mesas. The Travess illa soil juniper, twoneedle pinyo n, scatt ered sagebrush, and g rasses . The T ypi ca lly, the s urface layer is brown fin e sand y lo am , a bo ut Travessilla soil. The avail abl e water capac ity is This unit is used for livestock grazin g, wood is s hallow to very shallow and is we ll d ra in ed . It fom1ed in potential plant community on the Travess illa soil is mainly Utah very low. The effecti ve roo tin g d e pth is four to 20
69 outcro p compl ex, res iduum derived dominantly from s andstone. juniper an d an understory o f needleandthread , bottlebrush 5 ,400 to 6,800 two-inch es thick. The underlying materia l is ye ll owis h brown inches . Runoff is rapid, and th e hazard of water producti o n , or wi ld li fe habitat. The
I 0 to 35 percent fine sandy loam, about n in e-inches thi ck. S and stone is found at Travess illa soil is in the Foo th ill Juniper
slop es This unit is about 45 p erce nt Travess illa fin e s andy lo am and 40 squirreltai l, bluebun ch wheatgra ss, Sandberg bluegra ss, and g all eta. a de pth of about nine inches. eros ion is very severe. Rock outcrop occurs as ec ol og ical area. p ercent Rock outcrop. If range conditions decline as a res ult o f overgra zing, the proportion round ed s ands tone knolls and ledges throug ho ut
of forbs, shrubs, and juniper in creases. th e unit.
The native vegetati o n typi ca ll y found growing in this soil is grass
and shrubs. The so il a lso h as the po tenti a l to hos t plant communities
of alk ali s ac aton , inland salt grass, weste rn wheatg ra ss, fourw ing Pem1 eability is mod erately slow in th e Uffens saltbush, and g reasewood. If range conditions decline a s a result of T ypicall y, th e surface layer is very pale brown loam , abo ut
Uffens loa m , I to 8 This d eep , well drained, s trongly alkaline soil is fo und on mes as overgrazin g, th e p resence o f greasewood , in land saltgrass, and tall fi ve -in ches thic k. The subsoil is pale brown loa m , a bo ut 22 soil. The avai la bl e water capac ity is moderate. This unit is u sed mainly for lives toc k grazing
70 percent s lopes and terraces. It fom1 ed in allu vium deri ved fro m mi xed materials. rabbitbrus h increase. If continu ed d eteri oration is all owed , 4 ,800 to5,IOO inch es thi ck. The s ubs tratum, to a d epth of 60 in ch es or mo re , The effective rooting depth is 60 in ches or mo re. o r as wild life habitat. This unit is in th e Salt
ch e at grass, Russ ian thist le, kochi a, h alogeton, and pepperweed is pa le brown s andy loam . Runoff is medium, and the hazard of wa ter F la ts ecolog ic al area .
invade. Brush management can improve deteri orated areas of range eros ion is moderate to very sever e.
that are produci ng more woody shrubs th an were present in the
po tenti al p lant community.
The Utso soil is deep and we ll drained. It form ed in colluv ium
This map w1it is found on s ide s lo pes. The nati ve vegetati on typicall y fo und g ro wing in thi s soil is Rocky deri ved dominantly from th e Green Ri ve r shale fo nnati o n. Pem1 eability is moderate in the Utso soil. The This unit is used for li ves tock grazing, wood Utso-Roc k outcro p Mountain Do ug las-fir , shmbs, and scatt ered gra sses. The soil also T y pi ca ll y, th e s urface layer is very dark gra yish brown ava ilable water capacity is low. The e ffecti ve
71 compl ex, 40 to 90 Rock outcrop occurs as ho ri zont a l b ands I 0 to 50 feet high along has the potential to hos t pl ant communities of Rocky Mountain 6 ,8 00 to 8,000 c hann ery loam , ab out four -inches thick. The n ext la ye r is d ark rooting de pth is 60 inches or mo re. Runo ff is produ cts, o r wildlife habitat. The Ut so soil is
p ercent s lopes c anyon rims and as buttresses ex tending into areas of the Ut so Dougla s-fir and an unders tory of mo unt ain brome, nodding brome, gra yish bro wn very channery loam , about seven inch es thic k. rapid , and the ha zard of water erosion is ve1y in the Rocky Mountain Doug las-Fir
s oil. The buttresses make up abo ut 5 percent of th e Rock o ut crop. kinnikinni ck , e lk sedge, and mounta in s nowberry. The s ubsoil , to a d e pth of 60 inch es or more, is g ra yi s h brown severe. ecological area.
very channery lo am.
This map unit is found o n canyon s ide slop es . It formed in deeply
trun cated res iduum and locali zed coll uvium deri ved d ominantly
fro m marin e sha les and sandstones. Abo ut I to 3 pe rcent of th e
T ypicall y, th e s urface laye r is g ra yish b rown g ravell y sandy s urface is co vered with stones th at are s paced I 0 to 30 feet a part . Pem1 eabi lity is s low in the Wray ha soil. The
S lope vari es, dep end in g in part on th e loca l thickn ess es an d loam, about four-inc hes thick. The upper part of the underl ying ava ilable w ater capac it y is mod erate. The
sequences o f hard sand ston e and th e softer o r less sta bl e s hal e. materi a l is pale o li ve clay loam, a bout 24 inches thic k . The effecti ve rooting d epth is 60 in ch es or more.
Indi vidual areas o f thi s unit are irregu larly elongated and ran ge n ext part o f th e s ubsoil is reddish g ra y s ilty clay loam , about 2 1 Run o ff is rapid, and th e hazard o f water erosio n is
fro m I 00 to 500 acres in size. inches thi ck . The lower p art of th e underlyin g mat e ri al, to a very severe.
This unit is about 35 percent Wrayh a soil, 20 percent Rabbitex d e pth of 60 in c hes or more, is gray ish brown s ilty c lay loam.
Wra yha-Ra bbi tex-soil, and 20 percent Veatch soil. The pro porti o n of the Wrayha The n ati ve vegetati on typ ica ll y fo und growing in this soil is shrubs
Veatch compl ex, soi l is higher in areas o f geologic insta bi lit y. and perennial grasses. The soil a lso has th e potenti al to host p lan t This unit is used for li ves tock graz in g or as
75 45 to 65 percent communities oftwo need le pin yo n and G am bel's o ak and an 5 ,800 to 7 ,600 Pem1e ability is mod erate in th e R a bb itex s oil. h a bitat for wi ldli fe. The unit is in th e
s lopes, very s tony understory of western wheatgrass, b lue bunch wheatgrass, prairie T ypi ca ll y, th e s urface layer is brown loam, a bo ut seven -in ches The av ai lable water capac it y is hi gh . The Mo unt a in Pinyon ecological area.
The W ray ha so il is deep and we ll d ra in ed . It fo m1 ed in res iduum Junegrass, e lk sed ge, and muttongrass. th ick. The upper part o f th e subsoil is light gray loam , a bout effecti ve rooting depth is 60 inch es or more. deri ved dominant ly fro m marin e s hales. ei ght-in ches thic k. The lower part of th e s ubs tra tum, lo a depth Run o ff is rapid , and th e haza rd of wa ter eros ion is o f 60 in ches or more , is light gray c hannery loam . very s e vere.
Th e Rabbitex soil is deep and well drained . It fonned in res iduum
T ypi ca ll y, the s urface layer is dark g ray ish brown lo am, a bout Penneabil ity is mod erate in th e Veatch so il. The and co ll uv ium deri ved dominantly fro m siltstones and fin e
grained s an ds to ne. s ix-in ches thi ck . The upper part of th e s ubsoil al so i s dark ava il able water capa city is low . The e ffec ti ve
The Veatch so il is moderat e ly deep a nd is we ll drained . It
g rayis h brown loam. It is about fiv e-inches thi ck . Be low thi s is roo tin g depth is 2 0 to 4 0 in ches. Runo ff is
2 1 inches o f pale brown very channery s andy loa m . Sand stone medium, and the hazard of wat er eros ion is very
form ed in res iduum and colluvium derived do minant ly from is fo und al a de pth o f about 32 in ch es. severe.
marine sand stones , si lts l ones, and s hales.
The na tive vegetatio n typi call y found g rowin g in thi s soil is s hrubs Permeabil ity is moderately s low in the Yo ungs ton and grass. The soil a lso ha s the potentia l to h os t plant communities soil. The avail a ble wat er capacity is hi gh . The
This d eep, well drained soil is fo und on a llu vial fans, va ll ey o f g all eta, Ind ia n ri cegra ss, fourw ing sa ltbush , and s hadscale T ypicall y, the surface layer is ligh t brownis h gray loam , about effec ti ve rootin g depth is 6 0 in ches or more. This unit is used for li vestock g razing o r as
78 Yo un gston loam , I boll om s, low terraces, and fl ood p lains. It fo m1 ed in ca lcareous, saltbush. If range condit ions decl in e as a res ult o f overgrazin g, th e 4 ,800 lo 5,400 four-inches thic k. The upper part o f th e underlyin g materi al is Runoff is s lo w, and th e ha za rd of waler erosion wild life h a bitat. This unit is in the Loamy 10 6 percent s lo pes presence o f Gardner's s altbus h, ye ll ow rabbit b rus h, broom p ale brown loam , ab out IO -inch es thi ck . The lower part, to a s tratifi ed all uvium deri ved d o minantly from s ed iment ary rock. s nakeweed , and p lains prick lypear increase. If continued depth o f 60 inch es or more, is strati fi ed loam. ranges fro m s lig ht on the lower s lo pes to severe Salt Desert ecolo gical area.
deteri orat io n is all owed, cheatgrass, halogeton, Russian this tl e , and in the steep er areas. The lower part of the s o i l is
annual mus tard in vade . moderate ly sali ne.
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