HomeMy WebLinkAbout2.0 BOCC Staff Report 02.02.1994G* r/r
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BOCC U22194
PROJESI TNFORMATION AND S'TAFF COMMENI'S
REQUES'I':
APPLICAN f:
LOCATION:
ACCESS:
IIXIS"IING AND ADJACEN'I ZONING:
Special Use Permit for Natural Gas
Transmission Line
Rocky Mountain Natural Gas
Company
A right-of-way located in portions
of Sections 13 and 24,T65, R94W
of the 6th PM; located near the I-
70/Rifle interchange.
N/A
A/R/RD
L
I
RELATIONSFIIP TO T'I:IE COMPREHENSIVF PLAN
The subject property is located in Distriot C - ltural Areas wilh Minor Environmental
Constraints and District F - Rural Areas with Major Environmental Constraints as
designated by the Garl-reld County Comprehensive Management District's map.
DESCRIPI'ION OF TIIE PROPOSAL
Site anrl Project Description: Rocky MounLain Natural Gas Company and
Public Service Company of Colorado are requesting a Special Use Permit to
construct a twelve (12) inch steel natural gas pipeline near the Rifle/I-70
interchange. The SUP is being requested for a short section of the pipeline that
will extend from a point north of the D&RGW railroad tracks to the south side
of the Colorado River. The segment is part of a larger project that will
eventually extend from Rifle to Avon.
The applicants arerequesting approval for only this portion due to construction
constraints placed on the project by BLM and Fish and Game. Completion of
this section, consistent with these requirements, must be completed by April l,
1994. An additional application will be subrnitted to the County at a Iater date.
A project bounclary map o{'the SUP is attached on page 3 L
III. MAJOR ISSTIE,S AND CONCERNS
l. The applicants have submitted easement agreements for the pipeline from all
affected private property owners in Garheld County.
2. No agreement to cross I-70lrom the Colorado Department of Transportation
has been provided, although the applicant has indicated that the required
approval from CDOT is in process. Staff suggests that CDOT approval be
A.
e 33-
submitted prior to any construction.
The project will require a nationwide 404 permit from the Army Corps of
Engineers. The 404 permit has not been approved, but is currently in progress.
Staffsuggest that Army Corp approval be submitted to the County prior to any
construction.
All mitigation measures associated with the project are described in Appendix
A of tlle_Environmental Assessment (see copy of mitigation measures on pages37.iltt
No materials or equipment storage are proposed as a portion of the application.
Permanent impacls ftom l.he proposed development should be minimal. No
above-ground improvements are included as a portion of the application. The
primary impact should be addressed as a function of revegetation. Rocky
Mountain Natural Gas's revegetation policy provides for either reseeding
damaged areas or paying the applicant the costs of reseeding.
IY.SI.IGGESTE,D FINDINGS
That proper publication and public notice was provided as required by law fior
the hearing belore the Board o[ County Commissioners.
That the hearing before the Board of County Commissioners was extensive and
complete, that all pertinent facts, matters and issues were subrnitted and that all
interested parties were heard at the hearing.
That ttre application is in compliance with the Garlield County Zonrng
Resolution of 1978, as amended.
For the above stated and other reasons, the proposed use is in the best interest
of the health, safety, morals, convenience, order, prosperity and welfare of the
citizens of Garfield County.
RFCOMMENDA'I'ION
APPROVAL, subject to the following <;onditions:
All proposals of the applicant shall beconsidered conditions of approva-l unless
stated otherwise by the Board of County Commissioners.
The applicant shall have 120 days from the date of the Resolution of
Conditional Approval to meet all conditions set forth in the Resolution. The
Special Use Permit shall be issued when all conditions are met and shall expire
120 days after issuance, unless construction or use have commenced.
All revegetation shall be in aocordance with the revegetation agreements
approved by each property owner. All revegetation shall be conducted with
certified weed-free seed. Rocky Mountain Natural Gasshall be responsible for
weed control in accordance with State and County regulations.
No materials or equiprnent sLorage or staging area shall be approved as a
portion of the application.
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Prior to any construction, the applicant shall submit final approval from the
Colorado Departrnent of Transportation and the Army Corps of Engineers.
I lours of operation shall be limited to daylight hours.
The applicants shall provide adequate dust control during construction and
revegeLation.
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,11i',:l *::l'-tl:11 nlNc ancl .l'SCo have cornnrittect ro a variery or r,casures toprotect tlte natural resources presenr alo.g the pipelir;;';;;;;.'ir*r"'r,.j#.ilr:;;"r",:;
the project attd tltus, *.t" anrlyzecl as part of thf |roject. 'l-hey are not ,ritigation measuresbecause tltey were ttclt cteve lopi(t to ,.,]r.. significani inrpacts. 'l'hese rneasures include bestmanagentent and construction practices.
ilh:t-"-1']1'sures' lxesetlted below, rvill be incorporated into eaclr co'struction c,.tract letby RMNG and PSCo' In aclclitiott, tlte constructiln superuision will use a clualificcl i.spectorto oversee the ternrs of the colltract.
General Measures
i . Right-of-rvay an<l site clearing,
o trenching,
. backfilling and gracling,
. Iand preparation ancl cultivation
a revegetation,
,,. nraintenance ancl nronitoring,
Standard procedurcs for tlte project will include inrplenrentatio, clf erosio, co,trol andrevegetation measures to ensure tltat lands clisturbecl by construction activities will berestored to a stablc, productive, ancr aestrreticalry acceptabre condition.
Detailed speciticatiotts for coltstructiou, restoration, ancl reclanration rvill be clevelopedfor the selected alternative ancl incluclecl in a Plan o[ constructicln. Bef,re co.structionbegins, this I'lan o[ Cottstruction rvill be subnrittecl to the BLM a,d Irorest service forrevierv and cotnnte.nt. 'I-he terrain, soils, water, vegetation, ancl lancl uses, will beconsi<Iered during the creverop,rent of trrese ,p".iri.itiunr.
During cottstruction o[ the prcrject, a representative of RMNG or pSCo will: a) act asa liaison rvith tlle. lanclorvner/igency representative; b) provirre expertise to clirectrestoration of the right-of-rvay rvlien special corrclitions are encounterecl-, witSout causi,gco.structio, delays; and c) prolnote favorabre llubric ieraticlns.
Getteral llleasures for ero.siotr control and restoration will apply to the folloivirrg tech-niques:
92
37 -
5. Installation of the pipeline will [ollorv clearing of the construction area. lteclamation
and revegetation rvill follorv the pipeline's installation, especially in areas witS soils that
are highly susceptible to wind or water erosion.
6. RMNG and I'>SCo rvill conduct all activities associated with the project in a nralner thatwill avoid or rninintize degradation o[ air, lancl, anrl water qrrilty. 11 t5e colstruction,
operation, and nraitttenance of the project, I{N,ING ancl PSio wiil pertonu tlreir activi-ties according to applicable air attd water cluality stanclarcls, relatecl tacility sitirrg stan-dards, and related plans of irnplenrentatiori.
7. All desigrl, constructiott, operation, and nraintepalce practices will be colclucted
according to safe and proven engineering practices.
8. When possible, project rvork will be coordinatecl rvith other work occurring on orplanned for locations aloltg the route.
9. Where landowners have not identifiecl specific lneasures for the reclanration apd revege-tation of their propcrty, RMNG and PSCo rvill use the rneasures outlined ip tSis appen-dix and the Plan o[ construction, if approvecl by the lanclowner.
10. Disturbance to ittty wetlancl areas will be rnininrized tlrrough the use of protective nrats,when needed- A-lso, disturbance linrits rvill be controllecl clu-ring construciion with uppro-priate nlarkings.
,Specific Resource/Activity Measures
Access and Transpo ftatiot"t
AII roads disturbed during the project's construction will be recolstructed to nreet tleapproval of the controlling jurisclictiolr. RMNG ancl l'SCo will obtain approval frorn all
controllirrg jurisdictions for all roacl reconstruction.
Constructiotr-related traftic will be restrictetl to routes arpproved by the controlling juris-
diction. New itccess roacls or cross-country vehicle travel will noi be permittecl u,less
!t-i9t approval rvas given by the controllirig jurisdiction. Any ternporaiy roacls used byRMNG and PSCo will be rehabilitated wlieir construction activities arl conrpleted, asapproved by the controlling jurisdiction.
Where possible, the right-of-way itself rvill be usecl as an access road duripg theconstruction period.
All te-rnporary roacls rvill be closed and areas restorecl without updue delay or within
time frantes stipulated by the controlling jurisclictions ancl nraiptainecl as speiified in t5eIand use authorizations.
,-37-
93
5. Boring rvill be specificd when required for cleveloped roacls.
6. When providing access to the pipeline's right-of-rvay, all rivers, strearns, and washes will
be crossed at existing roads or bridges; any clther crossings nrust be approved and desig-
nated by the controlling jurisdiction. Perrnanent culverts will lneet s[)ecifications
stipulated by the corttrollirrg jurisdiction or landowner. Where drainages will be crossed
by temporary roacls, dirt fills, or culverts rvill be placed and rernovetl upon cornpletion
of the project. Culverts on tenlporary roads will rneet the approval of the controlling
jurisdiction. All streanr chanttels and washes will be returned as near as practical to
their natural state.
7. All darnagcd streets will be repaired to thc pernrit recluirernents of the governing agency
(e.g., city or county road or street cut perntits), or otherwise to ai equal oi better
condition.
Tratfic Control
All traffic will be controlled itr a sale ancl e[[icient nrarrner accorcling to Colorado Depart-
ment of Lligltways staltdards and the Manual of Unitorm fraffic Control Devices.
Clearing and Site Preparatiort
1. To rnirtirnize disturbance associated with installation of the pipeline, RMNG ancl PSCo
will not grade the right-of-rvay outside the trench line, except where necessary, on all
level and gently sloping terrairr.
2. Sideltill cuts tvill be kept to a ntittiutunr to protect local resources while providing a sa[e
and stable ltlane for the efficient use o[ ecluipment.
3. Existing grouttcl cover such as grasses, leaves, brush, and trees rvill be clearecl only
wltere necessary for operatiolt of equiprnent. In general, grass, forbs, ancl shrubs will be
cut olf near groulrd level leaving their root systenrs intact. The cuttings will be reclistrib-
uted over the right-of-way during reclamation or clisposed of as directecl by the lanrl-. owner/agency representative.
4. Trees and large sltrubs tltat are not clearect from the right-of-way will be protccted frorn
damage during cottstruction by avoiding tlrern with e<luipnrent. F,rr
"*uni1rle,
bulklozers
will ntaintairt tlreir blade in a. raised position except at areas designatecl ior clearing or
to smooth out sharp breaks in relief.
i, Pipeline Inslallation
1. Crading for thc pipeline will be done only rvhen necessary for the safe operation o[ the
installation.
94
2. Materials excavated front the trench rvill be storecl next to the trench to facilitate usinga minintutn amoultl of tlte right-of-rvay, and protect the rnaterial from velicular andequiprnent traffic.
3' The trench will be excavated using as snrall an area of clisturbance as possible tcl nripi-mize disturltance o[ vegetation.
4' Excavatiort o[ the trenclt in especially sensitive areas nray be conducted according tospecial tecltttiques as specifiecl by the lanrJorvner/agency representative.
Bacl<fillirtg and Grading
1' Backfill for the trenclt will be reinstalled anrl approved as requirerl by the la.clowner/agency representative.
i
2' Where local hydrological concliti<lns warrant, tl,MNG anct PSCo rvill install breakersmade trp of sandbags in the trenclt before backtilling. "flese breakers will co,trol sub-surface drainage along tlte pipeline.
3' In areas of steep sltlpes tltat are not annually cultivateil, waterbars or runo[f diversionswill be installed as follows:
Slope
(l'ercent)
Diversion Spacing
(Feet)
3 through T
B through 15
16 tlrrough 30
31 through 40
41-r
150
100
75
50
35
Reclamation and Revegetatiort
1' All cuts macle. in steep or rolling terrain during construction will be regraded anclcontoured to blend into the adjoining lanclscape oi-,,t to reestablish tSe latuial drainagepatterns.
2' Where required, erosion control structures such as water bars, cliversion channels, andterraces will be constructed to divert water away frorn the trench and reduce soilerosion alclng the right-of-way and other adjoinirrg areas disturbed cluring colstruction.
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These structures will be designed as specifiecl and approved by the controlling
juriscliction. Probable areas where tlrese structures rnay be ireecled *lll Ue identifiecl in
the Plarr of Construction (see General Measure Z on page 9Z).
RMNG and I'>SCo rvill disJlose of tnaterials unsuitable for use as backfill or excess back-fill material at approved lclcations.
Temporary lvork space areas use<l for crossing strealns arrd highways ancl other special
sites will be restored to approxirnate preconstruction conclitions.
Suitable tnulcltes and other soil stabilizing practices will be used on regrarlerl and
topsoiled areas, where recluired, to protect unvegetated soil frorn wincl ancl water
erosiott and to improve water absorption. RMNG and lrSCo will cousult with the
controlling jurisdiction or lattdowner to <Ie[ine the appropriate nrulchcs for each
segtnent of the route. Probable locations for tlre use o[ rnulchbs or other soil-stabilizing
practices will be identified in the Plau of Construction (see General Measure 2 oi
page 92).
Unless otherrvise directed by the lanclorvrrer or tlte jurisclictional authority, RMNG and
l'SCo will redistribute rocks, cut vegetation, antl ilther surface rnateriil ternporarily
stockpiled for cottstruction back across the right-o[-way clisturberl during constiuctiori.
RMNG and PSCo rvill seed disturbed areas using seecl rnixes apllropriate to the loca-
tion. The specific locations along the selectecl alternative where eacir seed nrlx will be
applied will be identified in the Plan of Construction (see General Measure 2 on
page 92).
Seed lvlix 1 This mix rvill be usecl on soil nrapping unit 3 north o[ the Ccrlorado River
above the floodplain. It is adaptecl to the soil's characteristics, including' saline nature and slorv penneability.
Conrnron Name Scientil'ic Nanre Variety
Amount
(lbs/Acre)
Western wheatgrass
Streambank lvheatgrass
Indian ricegrass
Alkali sacatorr
Yellow sweetclover
Scarlet globernallorv
Winterfat
Fourwing saltbush
Total
Agropyron slritltii
A gt'o1t1, 1'o 1 1 i p a r iwt t
Otyzop.sis I rytnenoides
Sporobulw airoidies
Iv[elilouu ofiicilmlis
Sltluteralcea coccilrca
Ceratoides lanala
Atiplex conescens
Arriba
Nezpar
Salado
Midrid
Ricon
3
3
2
1
0.5
0.5
2
2
14
96
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3.
5.
6.
7.
,. ,t
rd n,Iix 2 T}is
'firmoll Name
mix wi' be used aroun<J cr,ssi,gs of streams and wetrarrcrs.
Scientific Nanre Amount:stern wheatgrasi Agropyrott ,iui Variery (lbVAcre)
nder wheatgrass
:anrbank wlteatgrass
,in wilclrye
ted hairgrass
otal
A gropy ro r t t rac I ry c a rt I tu r t
Agropyron ipaitutt
ElS,nuts citreius
D esc ha nryts ia c a esp i r os a
Arriba
Pryor
Magrrar
3
3
3
3
I
e area to which seed nrix 2 is beins zDrrtiprr rr^.r --
I ,#* Hi *f, tr i:,:* # ffi 5q#*l;:g ti d'.'ffi :i'i,"*'
\o",' ;1:,ll'l will be used on all sagebrusrr areas crisrurbecr by co,struction of trre
i
ruon Name Scientific Name:rn wheatgrass Aunount
Agro1ryrcn,,,rifr Variery (lbs/Acre)
nb.ank yheatgrass
rrcegrass
rnch wheatgrass
, sweetclover
;ebrush
t,
ittl
ArribaAgropS,ru7 iltariturt
O ryzops is lq,nrc tto icles
Agropyrotr spicarurn
Ir[elilotrc o!fichnlis
Artenrcsia tidentato
97
Nezpar
Whitrnar
Midrid
I-Iobblecreek
3
2
2
4
0.5
1
12.5
/z-
I\Iix 4 'fhis nrix rvill
pipeline.
be used on all otlrer areas disturbed by construction clf the
Common Narne
pestern wheatgrass
.Streanrbank wheatgrass
Indian ricegrass
Bluebunch rvheatgrass
Yellow sweetclover
Bitterbrush
Mountain nrahogany
Tcltal
Scientific Name
Agropyron snitlii
A grop1,ys 1 1 ri po ri unt
O ryzops is I ry r n e no icl es
Agropyron spicatunt
Iv[elilotus o[lichnlb
Purslia lidentatu
Cetcoca rptts n to t tl 0 nus
Variety
Arriba
Nezpar
Whitrrrar
lvlidrid
Anrount
(lbs/Acre)
3
nL
2
4
0.5
1
1
13.5
Seed will be plantecl by clrilling or broadcasting.
For drilling, seed will be plantecl using a clrill equipllerl rvith a clepth regulator to ensureproper depth o[ plantirrg wltere drilling *ur p,lrsible. 'Ihe seecl lnix *Ilt u. evelly alclunilonnly planted over the rli.sturbed irea.
Drilling will be used rvhere topograllhy and soil conclitions allow operatiol of equiprnentto rneet the seeding requirernents of tlre sllecies being plantecl. ,,
Broadcast seeding will occur on steep terrain and on areas that are too rougS fgr drill-ing, such as where the cut vegetation ancl rocks rvere redistributed over the right-of-way.where broadcast seecling occurs, the rate <lf seedi,g will be croublecr.
Seecling rvill be clotte wlten seasonal or weather conclitions are most favorable accordingto scltedules identified by the jurisclictional authority or lanclowner. Whenever possible,seeding will be tirned to take aclvatttage o[ moisture, such as early spring or laie fall tobenefit fully fronr winter precipitation.
L,,,seed mixes rvill be plantecr in the amount sl;eci[ied in pouncls
i 1!.t" necessary.. tll:.r: rvill be no prinrary oi secr:'dary ,oxious
Cornmercial seed will be either ceitified or registere<l'seed.
The reestablishnrent of vegetative cover as rvell as watershed stabilization measures willbe scheduled during tlte workittg season and before the succeeding winter. In a1y case,
of pure live seed/acre,
rveeds in the seed mix.
98
(s,
revegetation treatlllents rvill be acconrplishecl as quickly as possible after installi,g t5epipclinc.
,;
13' The need for fertilizers will be deterutinecl in cclnjunction with the indiviclual landownersi f *::j:':1,:,1:,ll, l,1frr1ritr. rr rertitizai;;i,l;;.ssorl, rlre rates or applicatio. willbe based on site-specific sarnples of soil.
'14'
Temporary nreasures tlrat RMNG and I'SCo coulcl irnpleurent to facilitate reclanration,i and revegetation inclucle:
' o constructing tentpclrary breakers at proper intervals on slopes and access roacls to, control runoff rvhenever applicablei
' installirlg silt screens as silt barriers in swales, at the base of snrall slopes, asd ini other areas subject to seclinrentation fronr low velocity run'ff;
1, o' ' seeding critical areas suclt as roacl cuts and strearn banks with an approved grassseed urix;
, . r mulching slopes, where required; and
, o, protecting draius with barriers.
RMNG .and PSCo's Plan of Cottstruction will inclucle rneasures for prevention and
l:lf:::::.1.9: :,T,the.
right-or-yo, and lands used or traversecl by RMNG and pSCo.
rject persounel rvill bc instructe<t ai to irrdiviclual responsibility.
Besources
;.
During preparation o[ the right-of-way, RMNG ancl pSCo will trirn trees in preferenceto cutting trees and will cut.trees in pieference to bulklozirrg. T'hese techpiques will beused in combination to procluce a naiural-looking or featherld-e<Jge upp"o.uure rat5ertltan a straight-lined appearance.'l'rees will only 6. .rt or trirnme,itu r*iItate clearing,grading, and safe installation.
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Control
99
(/
2. Adjacent to tttajor llighrvays, trecs over 6 inches in diarneter zrt breast heiglt will be left
insicle the right-o[-way, rvlten practical.'frees rvhicft nrust be renrovecJ will be cut. Trees
outside tlte area of disturbance rvill not be cut, but will only have overSangi.g lirnbs
removed by cutting, witlt the tree to renrain. 'l'he bullclozeri rvill nraintain tireii blaOe
itt a raised positiort itt tltese sensitive visual resource areas, where practical.
Recreatiort
Unless otherwise requested by the landowner or jurisdictional autSority, RMNG a,cl pSCo
will.leave the right-of*1l itt a "roughenerJ" state that will cliscourage-the recreatiolal use
of the right-of-way by otf-nlad vehicle enthusiasts.
Safety, Health, and Waste Control
1. Care will be takett to avoid spill of lubricants or fuels and other types of pollutio, in
all areas, including streams and other boclies of water. Although .pilir u." u,likely, any' spills and trash will be clearted up irnnrecliately. Also, all appigpiirt" og",rcies will bi
prornptly notitied of any significant spills.
:2. Used engine oil rvill be containe<l in suitable containers an<l renroved frorn t5e right-of-: way.
3. Construction ecluiptnent will not be refuelecl clr serviced within or llear strearn channels.
4. Carbage and otlter refuse will be clisposed o[ in an authorized disposal site or landfill.
5. Construction sites will ahvays be tnaintained in a sanitary condition; waste nraterials at
those sites rvill be- disposed of prornptly at an appropriaie waste clisposal site. "Waste"
means all discarded tnater including hurnan waste,- trash, garbagei refuse, oil drums,I petroleurn products, ashes, and equiprnent.
Land Uses
Existing fences, gates, and brace pauels tlrat require nrcldification cluring constructionwill be recolstructed to appropriate stanclarcls.
All structures such as terraces, levees, unclergrouncl tlrainage systenrs, irrigationpipelines, and canals rvill be restored to preconitruction conditions so tSat tSJy will
function as originally intended, uttless clireitecl otherwise by tlre controlling juriscliltion.
RMNG and I'SCo will protect all suryey monuments founcl within the riglrt-of-way by
marking and avoiding-them. Survey nlonunrents inclucle, but are not linrite-cl to, General
I-and Office Cadastralsurvey Corners, reference corners, witness points, U.S. Geodetic
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benclttrtarks and triangulation stations, nrilitary control rrlonuments, apcl recognizablecivil (both public and private) surveys tnonulnenrs.
I[:TI"?j"1],.';,,]flI3"ll'.fl",:.:li:Tl'l or disrurbecr, RMNc arrd pSCo wlr report.u wur report
ll-",ji[if:,ij',]l::::t'':g; l:jl:11'l::1,.'/:e"";v.,.;p;;:e.tative and trre autrroritv trrat
#:i*:":i,::,:::::,:,lll:l_*wn. wrrere cE,.ilrr-,",r"o'iil;';si;lJ;;,il:il#?J
:jj:^T::j,_.:: y:'" obriteratecr during operations, nl,ri6'u',r"ilcffiil,'HiliX"Ji'JII JCUUIC TIIS
::ff:."j.:.1:9it_t-"]':d land surveyor to ,eitore the rlisturbecl nronunrents anct refere,cestu reretellcesji'i#.TT;,{:1,*Ij::"j,',i:: f::ilij".ll: yl",J;ri1;;ryp i11',.;;;;' the Survev
::N.:.1:,',1j,11'li"::,:::.fl:r: :,".:l'll :nd send. o ,opl to the rancrowner tasencv, l:ff#:::::: ll':T:I:1:.:.."r'.cl to rlstore the cristurbect survey,ru,ffiil'iiffnifiand PSCo will be responsible for the survey cost.v
4' RMNG anrl PSCo will provirle for the safety of the public using public roaclsintersectitrg the right-ot-rviy. safety measures wiil incruoe, tut not be li,ritecl ro, *racl, detours, barricades for ope, trencires, an<I ,agperso,s.
5' If ttoxious weeds infest portiotts of the right-of-way, the populatio,s will be co,trolledusing chemical, nrechanical, bioltlgical, Jr other rneans. control o[ t5e populations
, would occur during the season or grorvth stage where it woulcl be most effective.
Streanl Crossings, Wellands, and Fisheries
1' Where the right-of-ivay crosses streanrs ancl other bodies o[ water, the banks rvill bestabilized to prevent erosiott. Appropriat" ccrirstrrction tech,riqr", will be usecl tominintize datttage to slrorelines, recieational areas, ancl fis6 and wilclli[e Sabitat.Tecltniclues to be usecl inclucle those identified irr tlre coE Nationwide perntit stipu-
, Iatiorts' otlter tecltrticlues recluested by-til ;;;trot[,,g jurisdiction, nrry also be usecl.
2'.. During construction near streanrs or lakes, serlinrentation (cletention) basins, straw.; t"l"t,. or -fabric filters ntay be constructecl to prevent suspenclecl sediments fronr"' reaching downstreaur rvateicourses or lakes.
3' I)ry streams rvill .be cro.ssecl by trenching. srnall flowing streanrs will be crossecl by' fluming or trenching rvith a clownstrearn silt lrarrier to recluce dorvnstrearn sedir,enta-tion.
4' Disturbance to riparian vegetatiort ancl wetlancls rvill be nrininrized by keepi,g clearirgand installation to as no.io* a clisturbarr." o, llossible. Approaches to strea'rs willittvolve selective clearing of vegetation. willows and .oitun*oods cleared duri,gconstruction will be reestablished as part of reclarnation. Additional specific measuresare ide,tified in the stipulatio,s to tie CoE Nationrvicre permit.
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5' If work is recltrired in willorv/shrub type wetlancls, the srnall trees ancl slrrubs will betrimttted to grouncl li,e in areas ruheie .qrit;;;;will be worki.g. J.6is rvill mininrizethe danrage to the vegetation.
; 6' To minirnize irnpacts to rvetlattcls, only equiprnent needecl to dig t6e trencl, irstall the
||ff,,::i:.1'.Tr:11,1|||",:.-ll]:11d i..r,i,,iF{;il,,_"r-rvay win be auc,wecr to work i, trrem, area, u.tess a suitabre route is unavailabi;;ft;;r,i|',rr"rrrffi"" tu worK ,u tlre
ffi 7' Yu:l" stan<Jing water or saturatecl soils exist, eclu.ipment will operate ott tir,ber pacts,Hi prcfabricatecl equiprne.nt lr19r, o. g"ote*iii" rurrii. overlain'wirh gravel fill whenffi Irecessary for corlstiuction.'Afte. .u,r!*.ii.,i ril pads will be re,rovect.
ffirl
fil; B' ]'he first 12 i,ches o[ topsoil frot, wetlanc]s will be sarvagecl a,t] redistributed over the$ ::t::l as. quicklv ,t ,ot;ili; rollorvirrg i,,rtuirtiu,r.9r tlle pipeli'e. T5e seeds, roors, rrri-tr' zomcs, tubers, atld bulbs present. iir the topsoil will Lriharrce ancl hcl, spee,l ,pt. rrclamation of rvetra.ds disiurbed by co,strucrior.
['
i' 9' where llecessary, rvaterbars or sediment [ilters, such as stakerl straw bales or silt fences,i llt_k:?il;i::.[;;i;;;;, to trre ,,o,,i,,g, to reduce pote,riar sedin,enration in
l)
i' 10' T'he crossing of the coloraclo River will bc co,structecl as c;uickly as possible during lowi l]ow"fhe pipeline fclr the crossing rvill be urr"rt t.,r ano iestei* u r,rgi,rg area nearI the river before tlte trettclt ,t 9:g. t,rr,,,.,rio1"f afrer tlre tracklroes have ope,ed tleI trettch, tlte pipeline will be installed ancl the trlnch backtillecl.
11' In streatus rvitlt florv, tttaterial excavatecl frorn the trench will be spreacl out and pilerlirregularly to avoirl rlarnnrirrg the llorv.
fn reaii n ed o r En c! an g e red Species
surveys for tltreatened or.enclangered. plants, wilcllife (including raptors), or fish will be con-ducted to satisfy the IJLM's and Forest'seruice s ,.quir'",,r.,ts for consurtatio, rvitrr tle Fwsuttder section 7c of the Ertclatrgerecl Spccies A.i L;i;r" any construction occurs.
Cultural and paleontological Flesources
1' I{MNG a,d PSCo will nteet all stipulatio,s to furtil a1 ferrerar ard srate curtural andpaleotrtological resource legal r.qrir"rrr.rrts. Thislnclucles having a class III culturalresource and paleclntological resource survey co,rJucted by qualitied arclaeologists andpaleotrtologists before Jonstruction occurc] crlirirl resouice, an.t-significant fossilsfouttd during tlle surveys will be evaluat.,t oi,o piotectecl uncler tle clirectio' of thecontrolling j urisdictions.
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t: ' 2' Any cultural orpaleontological resources (historical or prehistoric site or object) discov-i', ercd will be..irnnrediateI reported to the lanclowner/agency representative. A]l
i operatiolts.wjllbe suspencled inlhe itnmediate area <;f such diicov!ry untilaut6orization
",' t.o proceed.is.issued by the lattclowner/agency representative. An evaluaticln of the] discovery witt b.e ntacle by the corttrolling iirisiiction to cletemrine appropriate actions' to prevettt the loss of significarrt cultural or scientific values. RMNG and psco will beresponsible for the cost of evaluation anrl rnitigation, ancl any decision as to proper
*lq:::ll'):?Iit,t{ll" ntacle by the Iantlowrier/asency r.prlr"n,orive arter colsutr-ing with RMNG and pSCo.
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