HomeMy WebLinkAboutEngineer's Design Plan129 CAINS LANE
CARBONDALE,CO A16'23
970.309.5259
CARLA.OSTBERG@GMAIL.COM
Fittl"t'I(i (;()Nst I r.'l'IN(;
May 13,2024 Project No. C1878
Bernie Colonna
bernie@h iqhcountrvbd.com
Subsurface lnvestigation and Onsite Wastewater Treatment System Design
Steel Building
0 cR 236
Tract B Amended Johnson Subdivision Exemption
Garfield County, Colorado
Bernie,
CBO lnc. performed a subsurface investigation and completed an onsite wastewater treatment system
(OWTS) design for the subject residence. The 7.05-acre property is located outside of Silt, in an area
where OWTSs and wells are necessary.
Legal Description: Section: 4 Township: 6 Range: 92 A TR lN SESW CONT. 7.05 AC. AKA TRACT B
AMENDED JOHNSON SUBDIVISION EXEMPTION.
Parcel lD: 2179-043-00-412
SITE CONDITIONS
The property is currently utilized for storage and parking. A steel building that will include a toilet and
sink to be utilized by approximately six employees is proposed.
An irrigation ditch runs to both the south and east of the proposed development. The entire ditch is not
depicted on our site plan, but we have enclosed a google earth image and the ditch is evident in the
aerial image.
The building will be served by a well located on Tract C. The well is located greater than S0-feet from the
proposed septic tank and greater than 1OO-feet from the proposed soil treatment area (STA).
The proposed soil treatment area (STA) location is relatively flat. The property slopes to the south with
up to a 5% grade. The proposed area is sparsely vegetated with native grasses.
There should be no traffic or staging of material over the future STA site to avoid compaction of soils
prior to construction of the STA.
SUBSURFACE
The subsurface was investigated on April 30,2024 by digging two soil profile test pit excavations (Test Pits).
A visual and tactile soil analysis was completed by Carla Ostberg at the time of excavation.l
' Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile
Evaluation of Soils Training.
Page 2
The materials encountered in Test Pit #1 consisted of dense, light brown silt loam to a maximum depth
explored of 8.O-feet. No bedrock or groundwater was encountered.
The materials encountered in Test Pit #2 were consistent with those encountered in Test Pit #1. Test Pit #2
was excavated to maximum depth explored of 8.O-feet. No bedrock or groundwater was encountered.
A sample of the soil was taken from Test Pit #1 at 3-feet below grade. Soil structure grade was moderate
to weak. The soil formed a ball and a ribbon approximately 1-inch in length before breaking. Soil
structure shape was blocky and consistence was friable. Soil texture was more smooth than gritty.
The subsurface was investigated by Kumar and Associates, Project No.24-7-110 and is documented in a
report dated March 22,2024 (enclosed). Two borings were drilled to 25-feet. Soils are described as Very
Silty Clayey Sand.
We have researched soils in the area through USGS Web Soil Survey. The report is enclosed. The area of
the proposed STA is identified by map unit symbol 3. The map unit name is Arvada Loam, 1 to 6% slopes'
The soil is consistent with Soil Type 24, Silt Loam, with weak structure grade. A long-term acceptance
rate (LTAR) of 0.5 gallons per square foot will be used to design the STA.
Test Pit #1
Page 3
Backfill sieved sample
Ribbon approx. 1"
'
i,
H,,
Sidewall (dense, moderate to weak structure grade)
Page 4
Test Pit #1
View of Test Pit #2 (looking from Test Pit #1)
Test Pit #2
Page 5
DESIGN SPECIFICATIONS
Desiqn Calculations:
Toilet and Sink for used by 6 office employees (15 GPD x 6 employees = 90 GPD)
Sizing Based on Average Design Flow = 300 GPD
LTAR = 0.5 GPD/SF
300 GPD i 0.5 GPD/SF = 600 SF x 1.0 (gravity trenches)x 0.7 (chambers) = 420 SF
The OWTS design is based on an average daily wastewater flow of 300 GPD.
For the purposes of this OWTS design, Benchmark Elevation has been established as 100' (Finished
Floor). CBO lnc. should be notified of any discrepancies or problems with grade elevations of proposed
components during installation of the OWTS.
OWTS Component Minimum Elevation
Primary Tank lnlet lnvert Approximate horizontal distance 1B'/ min. 2%fall I
min.45" fall
Distribution Box Approximate horizontal distance 52' I min. 1% fall I
min. 6.5" fall
lnfiltrative Surface Approximate horizontal distance 28' I min. 1 % fall
to STA / min. 3.5" fall
Page 6
*Elevations are based upon standard OWTS installation practices. Component elevations may change during
installation due to site conditions. Minimum grade refers to piping between components.
The 4-inch SDR-35 sewer line exiting the residence must have a double-sweep clean out and a minimum
2To grade to the septic tank.
The system installation must include a 1000-gallon, two-compartment lnfiltrator@ poly septic tank with an
Orenco@ Biotube effluent filter on the outlet tee. Any state-approved concrete or poly septic tank may be
substituted. Risers must bring the manhole lids to grade for access. lf more than one riser is added to
the septic tank, an extension handle must be installed on the effluent filter.
Effluent will gravity flow to a distribution box, and then to three gravelless chamber trenches. The sewer
line between the septic tank and distribution box crosses a driveway and will be subject to traffic. This
section of the pipe must be minimum Schedule 40 and should be well bedded and covered with blue
board insulation to protect from compaction and prevent freezing. The distribution box must be
accessible from grade and must have flow equalizers, or similar product, installed on each outlet pipe in
the distribution box to assure equal flow to each bed.
Each trench will consist of 12 'Quick 4' Standard PIus lnfiltrator@ chambers for a total of 36 chambers
and 432 square feet of infiltrative area. There must be at least 4-feet of undisturbed soil between each
trench. lnspection ports must be installed at the beginning and end of each trench. Ports may be cut to
grade and placed in sprinkler boxes for access.
COMPONENT SPECIFICATIONS
The component manufacturers are typical of applications used by contractors and engineers in this area.
CBO lnc. must approve alternative components prior to installation of the OWTS. Requests must
be submitted, in writing, to our office for approval prior to installation. Component technical data
sheets are available upon request.
Construction must be according to the jurisdiction's adopted On-Site Wastewater Treatment System
Regulations, the OWTS Permit, and this design.
COMPONENT MANUFACTURER MODEL NO.COMMENTS
Septic Tank lnfiltrator@ rM-1060-2CP 1000-gallon, 2-
:ompartment poly septic
:ank
Effluent Filter Orenco@ 4-inch diameter, full size
Tank Risers and Lids Orenco@ Double-walled PVC Rrsers and
-ids (24" diameter)
Distribution Box Polylok Distribution box, risers, lids,
and flow equalizers (3)
Chambers lnfiltrator@ 'Quick 4' Plus Standard 36 Chambers
PageT
PERMIT APPLICATION INSTRUCTIONS
An OWTS Permit Application must be submitted to Garfield County Environmental Health Department.
https://www.qarfield-countv.com/environmental-health/filesqcco/sites/16/OWTS-Application-Complete-
Packet-Dec.-2019.pdf. lf the OWTS Permit Application will be submitted with a Building Permit
Application, it should be submitted directly to Garfield County Building Department.
All questions regarding permit submission can be directed to Garfield County Environmental Health
Department, 970-945-661 4 xB1 50.
INSTALLATION CONTRACTOR
CBO lnc. expects that the installer be experienced and qualified to perform the scope of work outlined in this
design. The installer must review this design thoroughly and coordinate with our office in advance of
installation. Any additional conditions in this design or county permit must be completed and documented
prior to final approval of the OWTS installation. Communication between the installer and this office is
expected throughout the installation.
INSTALLATION OBSERVATIONS
CBO lnc. must view the OWTS during construction. The OWTS observation should be performed before
backfill, after placement of OWTS components. Septic tanks, distribution devices, pumps, dosing
siphons, and other plumbing, as applicable, must also be observed. CBO lnc. should be notified 48 hours
in advance to observe the installation.
ln an effort to improve the accuracy of the record drawing, we request that the installer provide a
sketch of the installation, including path of the sewer lines, water line installation (if applicable),
septic tank location, STA location, and measurements from building corners or another fixed
objects on the property. This sketch is most easily provided on Sheet W2.0 of the OWTS Design
Packet. Photographs of the installation and final cover are also requested to supplement our installation
documentation.
REVEGETATION REQUI REM ENTS
An adequate layer of good quality topsoil capable of supporling revegetation shall be placed over the entire
disturbed area of the OWTS installation. A mixture of native grass seed that has good soil stabilizing
characteristics (but without taproots), provides a maximum transpiration rate, and competes well with
successional species. No trees or shrubs, or any vegetation requiring regular irrigation shall be placed over
the STA. Until vegetation is reestablished, erosion and sediment control measures shall be implemented
and maintained on site. The owner of the OWTS shall be responsible for maintaining proper vegetation
cover.
OPERATION INFORMATION AND MAINTENANCE
The property owner shall be responsible for the operation and maintenance of each OWTS servicing the
properly. The property owner is responsible for maintaining service contracts for manufactured units,
alternating STAs, and any other components needing maintenance.
Geo-fabrics or plastics should not be used over the STA. No heavy equipment, machinery, or materials
should be placed on the backfilled STA. Machines with tracks (not wheels) should be used during
construction of the STA for better weight distribution. Livestock should not graze on the STA. Plumbing
Page 8
fixtures should be checked to ensure that no additional water is being discharged to OWTS. For example, a
running toilet or leaky faucet can discharge hundreds of gallons of water a day and harm a STA.
lf an effluent filter or screen has been installed in the OWTS, we recommend this filter or screen be cleaned
annually, or as needed. lf the OWTS consists of a pressurized pump system, we recommend the laterals be
flushed annually, or as needed.
The homeowner should pump the septic tank every two years, or as needed gauged by measurement of
solids in the tank. Garbage disposal use should be minimized, and non-biodegradable materials should not
be placed into the OWTS. Grease should not be placed in household drains. Loading from a water softener
should not be discharged into the OWTS. No hazardous wastes should be directed into the OWTS.
Mechanical room drains should not discharge into the OWTS. The OWTS is engineered for domestic waste
only.
ADDITIONAL GONSTRUCTION NOTES
lf design includes a pump, weep holes must be installed to allow pump lines to drain to minimize risk of
freezing. The pump shall have an audible and visual alarm notification in the event of excessively high-
water conditions and shall be connected to a control breaker separate from the high-water alarm breaker
and from any other control system circuits. The pump system shall have a switch so the pump can be
manually operated.
Excavation equipment must not drive in the excavation of the STA due to the potentialto compact soil.
Extensions should be placed on all septic tank components to allow access to them from existing grade.
Backfill over the STA must be uniform and granular with no material greater than minus 3-inch.
LIMITS:
The design is based on information submitted. lf soil conditions encountered are different from conditions
described in report, CBO lnc. should be notified. All OWTS construction must be according to the county
regulations. Requirements not specified in this report must follow applicable county regulations. The
contractor should have documented and demonstrated knowledge of the requirements and regulations of
the county in which they are working. Licensing of Systems Contractors may be required by county
regulation.
Please call with questions
Sincerely,
CBO lnc.
(ar.b,}gth'r'xg
K-CRO^A\II(P.0. Bo.i- r-,ro
I{nt:l, C0
gZo.2io,oi7z / [nc/rar,/a,crorrl@ourlooA.t'onr
ReviewedBy:
Kachayla R, Cronk, P.E.
Colorado License No. 61440
Carla Ostberg, MPH, REHS
STEEL BUILDING
N
SCALE: 1 = 50'=0"
TP1
+
PERTY LINE
TP2
+
STA
UTURE BUILDING
DRIVEWAYSEPTIC
TANK
SETBACK TO
IRRIGATION DIT(
RRI'
THE LOCATION OF PRC
NOT THE RESULT OF A
ARE APPROXIMATE. IT
ENSURE ALL CONSTRU
4'DIA SDR-35 DISTRIBUTION LINE TO EACH TRENCH
(MlN. 1% SLOPE TO TRENCH)
4" DIA SDR-35 INSPECTION PORT AT
BEGINNING AND END OF EACH TRENCH
TP1+
DISTRIBUTION BOX
WITH ACCESS AT GRADE
4" DIA SCH-40 TRAFFIC RATED SEWER LINE TO STA
(MrN. 1% FALL TO STA)
PROPERTY LI
PROPOSED OWTS
ZV
TP2+
5'MIN
'QU ICK-4' CHAMBER TRENCHES.
3 TRENCHES WITH 12 CHAMBERS PER TR
FOR A TOTAL OF 36 CHAMBERS AND
432 SF.
OOO-GALLON, TWO-COM PARTM I
SEPTIC TANK WITH EFFLUENT SI
4' DIA SDR-35 SEWER PIPE W
MIN 2% FALL TO TANK
STEEL BUILDING
BM = FF 100'
Pizaro Steel Building
0 cR 236
Garfield County, Colorado
Project Number: C1B7B
=LU
Eo
IIIIIIIIIIre
TIIIIIIIIIre
CBO lnc.
129 Cains Lane
Carbondale, Colorado 81623
Phone 970.309.5259
carla.ostberg @gmail. com
IIIIIII
IIIIIII
4' DIA SDR-35 INSPECTION
PORT AT BEGINNING AND
END OF EACH TRENCH
12 CHAMBERS PER TRENCH
4
SMALL VALVE COVER
BOX OR IRRIGATION
VALVE BOX AT GRADE
ATTACH CAP OR THREADED
CLEANOUT ASSEMBLY
4' PVC PIPE CUT TO
FIT
DISTRIBUTION BOX WITH
ACCESS AT GRADE
PIPES PLACED IN
TOP PORT OF
CHAMBER END
PLATES
FINISHED GRADE
4
LII
D(
SC
COMPACT
BASE TO SUPPORT
BOX
USE HOLE SAW TO
CUT THRU TOP OF
END
4' DIA SDR-35 SEWER LINE
(MrN 2% SLOPE TO TANK,
MrN. 1% TO STA)
SCREENED ROCK
OR SAND FOR
BEDDING
24'MlN.
3'MtN.
8" MlN.
Pizaro Steel Building
0 cR 236
Garfield County, Colorado
Project Number: C1B7B
BACKFILL
L
CBO lnc.
129 Cains Lane
Carbondale, Colorado 81623
Phone 970.309.5259
carla.ostberg@gmail.com
CHAMBERS = 600 SF X 0.7 = 420 SF I 12 SF i CHAMBER = 35 CHAMBERS
THREE GRAVELLESS CHAMBER TRENCHES
12 'QUICK 4' CHAMBERS IN EACH TRENCH
TOTAL 36 'QUICK 4' CHAMBERS
SOIL PROFILE TEST PIT NO. 1
TOPSOIL
LIGHT BROWN SILT LOAM WITH WEAK
STRUCTURE GRADE
NO GROUNDWATER OR BEDROCK ENCOUNTERED
DURING EXCAVATION
10
CBO lnc.
129 Cains Lane
Carbondale, Colorado 81 623
Phone 970.309.5259
carla.ostberg@gmail.com
SOIL PROFILE TEST PIT NO.2
TOPSOIL
LIGHT BROWN SILT LOAM WITH WEAK
STRUCTURE GRADE
A SOILS LOG
STA TO WELL
STA TO IRRIGI
0
LEGEND
F
FI
topsoil
silt loam
Pizaro Steel Building
0 cR 236
Garfield County, Colorado
Project Number: C1878
2
FL!ul
TL
I
=Fo-ulo
3
4
5
6
7
8
I
NOT TO SCAIE\7
Steel Building Legend
F K&KLumber
I
t,Lf
F
*J
T
I
GDqPublic.nef" Garfield County, Co
Account
Number
Parcel
Number
Acres
Land SqFt
TaxArea
2019 Mill
Lew
R200564
2179043004!2
7
o
020
67.5770
Physical
Address
Owner
Address
O 236 COUNry RD
SILT
PIZARRO CORRAL, ALBERTO &
PIRIACHAVEZ,
l2Ol BEDROCK CIRCLE
srLT co 81652
Overview
Legend
[-l Parcels
Roads
Parcel/Account
Numbers
Owner Name
l l ukes&Rivers
- CountyBoundary
Line
2Ol9TotalActual $829,580 Last2Sales
Value Date Price
876s2 7/12/2023 $1,402,s00
n/a $
D ate cr e ate d: 5 / t3 / 2O24
Last Data Upload ed: 5 / !3 /2024 2:72:75 AM
DevelopedryC)F."lrg,r"^,r4gf
5113124, 1:00 PM
Garfield County, CO
qPublic.net - Garfield County, CO - Property Record Card: R200564
Summary
View Map
Owner
PIZARRO CORRAL. ALBERTO & PIRIA
CHAVEZ,
1201 BEDROCK CIRCLE
srLT co 81652
Land
Unit Type WAREHOUSE/STORAGE-LAND - 2135 (COMMERCIAL PROPERTY)
Square Feet 0
Account
Parcel
Property
Address
Legal
Description
Acres
Land SqFt
Tax Area
Mill Lew
Subdivision
Buildings
Building #
Units
Building Type
Abstract Codes / (Property Type)
Architectural Style
Stories
Frame
Actual Year Built
Gross Living Area
Bedrooms
Baths
Heating Fuel
Heating Type
Air Conditioning
Roof Type
Roof Cover
Building #
Building Type
Abstract Codes / (PropertyType)
Architectural Style
Stories
Frame
Actual Year Built
Gross Living Area
Bedrooms
Baths
Heating Fuel
Heating Type
Air Conditioning
Roof Type
Roof Cover
Actual Values
Assessed Year
Land Actual
Improvement Actual
Total Actual
Assessed Values
Assessed Year
Land Assessed
I mprovement Assessed
Total Assessed
R200564
277904300412
0 236 COUNTY RD, SrLT, CO 81652
Section:4 Township: 6 Range: 92 A TR lN SESW CONT. 7.05 AC. AKA
TRACT B AMENDED JOHNSON SUBDIVISION EXEMPTION.
7.O5
n
20
6L.5170
7
1
WHsE/STORGE
WAREHOUSE/STORAGE-IMPS,-2235 (COMM ERCIAL PROPERTY)
MINISTORG NON CLIMATE
7
MASONARY
7981,
3,600
0
0
NONE
NONE
NONE
WOODTRUSS
CORG METAL
WHSE/STORGE
wAREHOUSE/STORAGE-r M PS.-223s (COM M ERCIAL PROPERTY)
N4INISTORG NON CLIMATE
L
MASONARY
1977
2,40O
0
0
NONE
NONE
NONE
WOODTRUsS
CORG METAL
2
2024
$737,O4O.0O
$92,s40.00
$829,s80.00
2024
$273,740.OO
$26,840.00
$240,s80.00
2023
$737,040.00
$62,540.00
$799,s80.O0
2023
$205,630.00
$17,450.00
$223,OSO.OO
2022
$350,090.00
$s7,960.00
$408,oso.oo
2022
$101,530.00
$16,810.00
$118,340.00
202!
$3s0,090.00
$s7,960.00
$408,0s0.00
2021
$101,530.00
$16,810.00
$118,340.00
2020
$3s0,090.00
$59,640.00
$409,730.00
2020
$101,530.00
$17,300.00
$118,830.00
https:/iqpubtic.schneidercorp.com/Application.aspx?ApplD=1 038&LayerlD=22381&PageTypelD=4&PagelD=9447&Q=11 90916789&KeyValue=R200564 112
5113124,'1 :00 PM
Tax History
TaxYear
Taxes Billed
qPublic.net - Garfield County, CO - Property Record Card: R200564
Click here to view the tax information for this Darcel on the Garfield Countv Treasurer's website.
Transfers
2023
$n,723.2o
2022
$7,e50.32
202L
$8,837.88
2020
$8,066.52
Sale Price
$o
$1,402,500
$338,100
$o
$o
$o
$o
$270,000
$o
$o
$o
$o
$o
$o
$o
$o
$o
Sale Date
7/12/2023
7/12/2023
5/3r/2007
5/74/2007
10/14/2002
LO/14/2002
4/3/1.99s
3/28/1994
7/7/1900
7/r/1900
rlr/L900
!7/1900
7/r/1900
7/7/L900
tl7/t900
7/r/1900
r/1"/!900
Deed Type
QUITCLAIM DEED
SPECIALWARRANry DEED
WARRANTY DEED
DEED OF DISTRIBUTION
BARGAIN AND SALE DEED
STATEMENT OF AUTHORIry
RESOLUTION
WARRANTY DEED
WARRANTYDEED
RESOLUTION
WARRANTY DEED
Deeds
PUBLICTRUSTEES CERT
QUIT CLAIM DEED
WARRANryDEED
Deeds
Deeds
Reception Number
987600
987599
724032
724037
p13048
613045
46t0gI
316p30
316eq4
304784
272761
26t2s9
2fo549
245923
241603
Book - Page
7929-0686
7929-684
7398-295
1398-288
0935-O997
0897-O158
0576-0572
o576-0466
0550-0270
0485-0430
o453-0423
0451-0368
0409-0095
o396-0292
0385-0450
Property Related Public Documents
Click here to view ProEIly Relaied-Puujg.DocCmenE
No data available for the following modules: Photos, Sketches.
1*e Carh<:.tl Couttly A :ess*r's {}{1rce rtt::i<.t:t evcry e lf lr i ro ::roJ uce ihi: s:c;t eciu r'ri' l
i{.)r.natic^ possibie. Nc v',,rrra:rrier. erpre :sed "rr i*tlicd a;-e 9it}v\i.}..J,rl lhe 'ja:a ile re in, lL:
uieoriltlgrilaeatiiiua l.J;ll;is:ul'i:c trr'-i)itef"(-tct'tiiea:\+ia::a,:tur;.aYl..dcc:*pleiella;s
rT.fltlli L.. Jlt.. ,.
i User Privacv PolicY : GDPR Privacv Notice
Last DaLa Ualead: 5 / 3312024, 12;12:It'5 AY
f-ci:l:i: LJa f;eveiolcci )y
()9gX,s,gf,er
https://qpubtic.schneidercorp.com/Application.aspx?ApptD=1038&LayerlD =22381&PageTypelD=4&PagelD=9447&Q=1190916789&KeyValue=R200564 212