HomeMy WebLinkAboutEngineer's Design129 CAINS LANE
CARBONDALE, CO 41623
970.309.5259
CARLA.OSTBERG@GMAIL.COM
sir.:rD.r.r(i (j()ñÍsit f -'l\ r trt(;
November 21,2023 Project No. C1848
Ashly Ditlow
ashlvditlow@qmail. com
Subsurface lnvestigation and Onsite Wastewater Treatment System Design
5-Bedroom Residence
3683 CR 241
Garfield County, Colorado
Ashly,
CBO lnc. performed a subsurface investigation and completed an onsite wastewater treatment system
(OWTS) design for the subject residence. The 1O-acre property is located outside of New Castle, in an area
where OWTSs and wells are necessary.
Legal Description: Section: 6 Township: 5 Range: 90 TR lN SWSE LYING NWLY OF CO. RD.241 & SELY OF
E. ELK CRK.
Parcel lD: 2123-064-00-006
SITE CONDITIONS
The property was previously developed with a residence that has been demolished. A S-bedroom
residence is proposed.
The previous residence was served by an OWTS. No documents were available on Garfield County
Land Explorer. The existing septic tank must be located and properly abandoned. The existing soil
treatment area (STA) may be abandoned in place.
The previous residence was served by a spring located near East Elk Creek. A new well will be drilled to
serve the proposed residence. The well must be at least S0-feet from the proposed septic tank and at
least 1OO-feet from the proposed STA. The water line must be at least 1O-feet from the proposed septic
tank and at least 2S-feet from the proposed STA.
East Elk Creek runs along the western portion of the property. The creek is greater than '1O0-feet from
any proposed OWTS component.
The proposed STA location has an approximate five percent slope to the northwest. The proposed area
is vegetated with sage and 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.
Page2
SUBSURFACE
The subsurface was investigated on October 18,2023 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
The materials encountered in Test Pit #1 consisted of dark brown topsoil to 1-foot, underlain by light brown
silt loam to a maximum depth explored of 7.O-feet. No bedrock or groundwater was encountered.
The materials encountered in Test Pit #2 consisted of dark brown topsoil to 1.O-foot, underlain by light
brown silt loam to a 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. The soilformed a balland a ribbon between 1 and 2-inches in length before breaking. Soil
structure shape was blocky and consistence was friable. Soil texture was smooth.
The soil is consistent with Soil Type 2, Silt Loam, with moderate structure grade. A long-term
acceptance rate (LTAR) of 0.6 gallons per square foot will be used to design the STA.
tCarla Ostberg holds a Certificate of Attendance and Examination from the CPOWVisual and Tactile
Evaluation of Soils Training.
Page 3
Test Pit #1 near the tree line
Backfill Test Pit #1 in foreground / Test Pit #2 beyond
Sieved sample Ribbon less than 1-inch
Page 4
Test Pit #2
Test Pit #2 Backfill
DESIGN SPECIFICATIONS
The existing septic tank must be located and abandoned by pumping the tank and removing it or
crushing the top, bottom, and sides and filling in the void with onsite materials. The existing STA will be
abandoned in place.
Desiqn Calculations:
Average Design Flow = 75 GPD x 2 people/bedroom x 3 Bedrooms + 150 GPD (4thand 5th Bedrooms) = $gg
GPD
LTAR = 0.6 GPD/SF
600 GPD / 0.6 GPD/SF = 1000 SF x (1.0 gravity trenches) x 0.7 (chambers) = 7gg 5t
The OWTS design is based on S-bedrooms. An average daily wastewater flow of 600 GPD will be used.
Page 5
For the purposes of this OWTS design, Benchmark Elevation at grade 6251' has been established as
100' (Finished Floor of Lower Level). CBO lnc. should be notified of any discrepancies or problems with
grade elevations of proposed components during installation of the OWTS.
"Elevations are based upon standard OWTS installation practices.
installation due to site conditions. Minimum grade refers to piping
Component elevations may change during
between components.
The 4-inch SDR-35 sewer line exiting the residence must have a double-sweep clean out and a minimum
2o/o grade to the sePtic tank.
The system installation must include a 150O-gallon, two-compartment lnfiltrator@ poly septic tank with an
Orenio@ 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 four gravelless chamber trenches. The
distribution box must be accessible from grade with flow equalizers, or similar product, installed on each
outlet pipe in the distribution box to assure equal flow to each trench.
Each trench will consist of 15 'Quick 4' Standard Plus lnfiltrator@ chambers for a total of 60 chambers
and 720 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.
OWTS Com Minimum Elevation
Primary Tank lnlet lnvert Approximate horizontal distance 11' I min.2o/o fall I
min.2.75" fall
Distribution Box Approximate horizontal distance 80' / min. 1% fall I
min. 10" fall
lnfiltrative Surface Approximate horizontal distance 37' to furthest
trench I min.1o/o fall to STA I min.4.625" fall
COMPONENT MANUFACTURER MODEL NO GOMMENTS
Septic Tank lnfiltrator@ tem # |M1530-2CP 150O-gallon, 2-
oompartment poly septic
lank
Effluent Filter Orenco@ 4" diameter full size
effluent filter
Distribution Box,
risers, lid and flow
equalizers
Polylok 4'Roto-flow'
Chambers lnfiltratoKÐ 'Quick 4' Plus Standard 60 cambers
Page 6
PERMIT APPLICATION INSTRUGTIONS
An OWTS Permit Application must be submitted to Garfield County Environmental Health Department.
https://www.qarfield-countv.com/environmental-health/filesocco/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 x81 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.
¡NSTALLATION 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 \Â2.0 of the OWTS Design
Packet. Photographs of the installation and final cover are also requested to supplement our installation
documentation.
REVEGETATION REQUI REMENTS
An adequate layer of good quality topsoil capable of supporting 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
property. 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
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.
PageT
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 CONSTRUCTION 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 potential to 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.
C.6j,[ø }stfung
Carla Ostberg, MPH, REHS
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CBO lnc.
129 Cains Lane
Carbondale, Colorado 81623
Phone 970.309.5259
ærla.ostberg@gma¡1.æm
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RESIDENCE
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Ditlow Residence
3683 CR 241
Garl¡eld County, Colorado
Project Number: C1848
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Designed by: CBO
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129 Cains Lane
Carbondale, ColoEdo 81623
Phone 970.309.5259
carla.ostberg@gmail.æm
INFILIRATOR
END PUÍE
,QUICK-4
CH,qMBER (4 x 3')
SDR.35 DISTRIBUTìON
LINETO EACH ÌRENCH
(MtN. 1% SLOPE TO TRENCH)
DISNIBUTION BOXWITH DIA SDR-35GWEINSPÉCTON
PORT
4
4'DlA SDR-35
EFFLUENT PIPE FROM
SEPTICTANK
L
sotL 2
LIMIT
PLACEO IN EXCAVATION
TOP PORT OF
CHAMBER END
PLATES
GRAVELLESS 'QUICK4'
CHAMBER (4 x 3)
/ã CHAMBER TRENCH SECTIONV,'
DIA SDR¿s INSPEfrION
PORTAT BEGINNING AND
END OF EACHTRENCH
/^CHAMBER 'TRËNCH PLAN\rr-
SMALL VALVE COVER
BOXOR IRRIGATION
V{W BOX AT GMDE
FINISHED GRADE
CÆ ORTHREADED BOX AND COVER BROUGHT TO GRADE
CLENOUT ASSEMBLY
24" MlN.CONCRETE
WC PIPE CUTTO 4' DIA SDR-35 SEWER LINE
(MtN 2ôlo SLOPE TO TANK,
MtN. 1% TO STA)
ffiãÑE-
BASE TO SUPPORT
BOX FT
USE HOLE SAW TO
CW THRU TOP OF SREENED
END CR SAND FÕR
BEDDING
3'MIN.
8'MlN.
BAFFLE OR
ANGLED PIPE
TO BE USED
/i INSPECTION PORT DETAIL\¿r--ffi
AT INLET
A'IRENCH DETAIL\3r-ffi
/â, DIS'IRIBUïON BOX DETAIL\9r-
15 CHAMBERS PERTRENCH
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Ditlow Residence
3683 CR 241
Garf¡eld County, Colo€do
PrcjectNumber: C1848
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Sheet 3 0F 4
CBO lnc.
129 Ca¡ns Lane
Carbondale, CdoEdo 81 623
Phone 970"309.5259
ærla.ostberg@gmail.æm
DESIGN
STA TO WATER COURSE 50'292'
STA TO WELL 100'MUST BE >1OO'
STA TO HOUSE 20'1 15'
SEPTIC TANKTO WATER COURSE 50'MUST BE >50'
SEPTIC TANK TO WELL 50'300'
HOUSE TO SEPTIC TANK 5'11'
OWTS COMPONENTS AND
PIIYSICAL FEATURES
MINIMUM REQUIRED
SFTBACK
APPROXIMATE PROPOSED
SETBACKs-BEDROOM RESIDENCE
75 GPD x 2 PERSONS/BEDROOI, x 3 BEDROOMS + 150 GPD (4th and sth
BEDROOMS)
WASTEWATER FLOW = 600 GPD
TANK
MIN,15OO GALLONS
USE,ISOO,GALLON, TWO-COMPARTMENT SEPTIC TANK
SOIL TREATMENT AREA (STA):
LONG TERM ACCEPTANCE RATE (LTAR) = 0.6 GAU SF
CALCULATED STA = CIiLTAR = 600 / 0.6 = 1000 SF
GRAVITY, TRENCHES = 1000 SF X 1.0 = 1000 SF
CHAMBERS = 1000 SF X 0.7 = 700 SF / 12 SF / CI-IAMBER = 59 CHAI,IBERS
FOUR GRAVELLESS CHAMBER TRENCHES
15 'OUICK 4' CHAMBERS IN EACH TRENCH
TOTAL 60'OUICK 4' CHAMBERS
/^ SE'IBACK CHARTlér-ffi
SO¡L PROFILE TEST PIT NO. 1 SOIL PROFILE TEST PIT NO. 2 LEGEND
lsl topso¡l
f,!ll sirtroam
TFÈ
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-0
-1
-2
3
-4
-5
DARK BROWN TOPSOIL DARK BROWN TOPSOIL
SLIP-ON PVC
DO NOT GLUE
LIGI{T BROWN SILT LOAM LIGHT BROWN SILT LOAM
INSUI-ATED
TRACERWRE FINISHED GRADE
4" DIA
6 SEWER LINE
-7
Lf-'
L-,0
TO TANK HOUSE
NO GROUNDWATER OR BEDROCK ENCOUNTERED
DURING EXCAVATION
/ã,CL-EAN OUT DETAIL\gr-ñffi
/ãSOILS LOG\v
Ditlow Residence
3683 CR 241
Garfield Couniy, ColoEdo
ProjectNumber: C1848
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tÐqPublic.nef" Garfield County, Co
81647
2019 Total Actual
Value
Overview
Legend
[-l Parcels
Roads
Parcel/Account
Numbers
Owner Name
ill Lakes&Rivers
- CountyBoundary
Line
$258,ó50 Last2Sales
Date Price
3/70/2017 $350,000
nla $
Account R013121 Physical 3ó83241COUNTYRD
Number Address
Parcel 272306400006 NEWCASTLE
Number OwnerAddress YOUNG, DAVID G &
Acres 10 KAMMYS
LandSqFt 0 32B5COUNryROAD2AI
TaxArea 013 NEWCASTLE COB!647
2019 MÍll Levy 55.1ó10
Dale created: 17/ 7/ 2O23
Last Data Uploadeú 7t/ tl2Ù23 2t$8t49 AM
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Garñeld CounW, CO
5ummary
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TilAÞ
qPublic.net - Garfield County, CO - Property Record Card: R013121
RO13121
212æ6,40000ó
3683 241 COUNTY RD, NEW CASTLE, CO 87647
Section: ó Tov¡rship:5 Rânge: 9OTR lN SI rSE LYING i{WLY OF CO. RD. 241&SELY OF E EtK
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YOUNG- DAVIDG& KAMMYS
3285 COUNTY ROAD 241
NEW CASttE CO 81ó47
Land
Unlt Typc I RRIGATED LAN D-AGRICLTRL. - 4117 (AGRICULTURAL PROPERTY)
SquãreFeet 0
UnitType GRAZING LANÞAGRICULruRAL - 4147 (AGRICUL-ÍURAL PROPERTY)
SquereFeet 0
Buildings
Building*
Units
BulldngTypê
Abstract Code / (PropertyTypel
Aftñitech¡ral Style
Storlês
Frðme
ActulYear Built
Bå6ernentArea
GræLivingArea
Total HeetedsqFt
Bedroons
Bãths
HeatlngFæl
HeâtlngTtDè
AirCmditíoning
RoofTypê
Roof C.drÊr
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FARM/RAI.ICH
FARM/RANCH RESIDENCE-IMPS42Z7 (RESIDENTAL PROPERTY)
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840
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'1111123,1'l.08ItM
Actual Values
AssessedYear
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TotalAch¡al
AssessedValues
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qPublic.net - Garfield County, CO - Property Record Card: R013121
m23
$4200.00
$254,4s0.00
$258,óso.m
M3
$1,110.m
$17270.ú
$18,3æ.00
2tz¿N2L
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ilLOtnLT QUIT CLAIM DEED 889975
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qælnß STATEMENTOFAUTHORITY 8647L5
4t4t2W DEATH CERTIFICATE 746æ2
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Property Related Public Documents
Click hereto v¡ew Propertv Releted Public Dæuments
No data mllable forthefollour¡ng modulæ Photc,Sketdt6
The Garñeld County Assessor's Office makes every effort to produce the most accurate information possible. No wârrañtiês, expressed
or Ìmplied are provided for the dãta here¡n, its use or ¡nterpretat¡on. Datâ ¡s subject to constant change ând its âccurâcy ând
completeness cannot be guaranteed.
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Last Data UÞload: 1U1l2O23. 12:08:49 AM
Book- Pa¡ê
09544292
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20.22
$3,1ó0.00
$158,050.00
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David Youn
From:
Sent:
lo:
Subject:
Ashly Ditlow <ashlyditlow@gmail.com>
Sunday, November 5,2023 3:28 PM
David Young
Fwd: Blue lines
Sent from my iPhone
Begin forwa rded message:
From: Carla Ostberg <carla.ostberg@gmail.com>
Date: November 5,2023 at9:28:22 AM MST
To: ash lyd itlow@gma il.com
Subject: Blue lines
Sent from my iPhone
Item #
It.l530-2CP
l53O Gallon Two Gompartment
lnflltrator@ Poly Tank
61 7"
TANKTOP
HALF
CONTINUOUS
EI-ASTOMETRIC
175.6 TANK
INTERIOR SEAM CLIP
TOPVIEW (86)
ruGilIÆNT
DOTYEL (1E)TANKBOTTOM
HALF
2/l¡ ACCESSPORT TarÚchdußffi
wrrH LocKtNG LrD (Ð O MID-HEIGHT sEAM sEcroN DETATL
OUTLET TEE
2/3TOTALVOL 1I3 TOTAL VOL
SIDEVIEW
SEAM CLIP
¡ Compliont with CSA ond IAPMO Stondords¡ PVC risers ovoiloble¡ Secondory sofety screen ovoiloble wíth
PVC riser
r Moximum buriol depth !s 48"
¡ Minumum buriol depth is 6"¡ Tonk is not roted for vehiculor troffic
looding¡ Exterior of monhole cover includes the
following worning: "DANGER DO NOT
ENTER: POISON GASES"
LIFTINGSTRAP
(ÍYPIGAL)
END VIEW
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Digging Specs lnvert Dimensions Net
Weight
Net Workin
16' Long x 7' Wide
43" below inlet
lnlet
47"
Outlet
44"
Length
175.6"
width
61.7"
Height
54.5"501 lbs.1006 gol 503 9ol 1509 gol
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