HomeMy WebLinkAboutEngineer's OWTS Design Plan'I29 CAINS LANE
CARBoNDALE, CO 81623
970.309.5259
CARLA. OSTBERG@GMAIL.COM
sittl"t'r(' ('()Nst rr.1'r\'(;
December 15,2023 Project No. C1836
Peter Mullett
pcmullett@gmail.com
James Madden
imaddenemail@qmail.com
Subsurface lnvestigation and Onsite Wastewater Treatment System Design
3-Bedroom Accessory Dwelling Unit (ADU)
2510 Hwy 133
Garfield Courtty, Colorado
Peter,
CBO lnc. performed a subsurface investigation and completed an onsite wastewater treatment system
(OWTS) design for the subject residence. The 2.48-acre property is located outside of Carbondale, in an
area where OWTSs and wells are necessary.
Legal Description: Section: 3 Township: 8 Range: 88 A TR lN LOT 16. EXCEPT A TR lN DESC. 854/58.
2.48 ACRES.
Parcel lD: 2463-034-00-040
SITE CONDITIONS
The property is currently developed with a residence and several out-buildings. These are located on the
eastern portion of the property. An additional dwelling unit (ADU) with up to three bedrooms is proposed
on the western portion of the property.
The existing residence is served by an existing OWTS and is not addressed in this design.
The residence and ADU will be served by the Town of Carbondale water system. The exact location of
the water line was not shown on the survey. The water line runs between the subdivision road and the
fence line on the north side of the propefi, and we have approximated this location on the site plan. The
water line has been located and flagged on-site. The soiltreatment area (STA) must be at least 25-
feet from the water line.
There is a well on the western portion of the property used for irrigation. The well must be at least 50-
feet from the proposed septic tank and at least 1O0-feet from the proposed STA.
The proposed STA location is relatively flat. The proposed area is 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.
Page2
SUBSURFACE
The subsurface was investigated on October 26,2023 by digging four soil profile test pit excavations (Test
Pits). A visual and tactile soil analysis was completed by Carla Ostberg at the time of excavation.l
fhe materials encountered in Test Pit #1 consisted of medium brown clay loam 2.O-feet, underlain by
medium brown, dense clay loam to a maximum depth of 5,O-feet, underlain by light brown sand 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 clay loam 1.0-foot, underlain by light
brown sand to a maximum depth explored of 8.O-feet. No bedrock or groundwaterwas encountered.
The materials encountered in Test Pit #3 consisted of medium brown clay loam to a maximum depth
explored of 4.0-feet. No bedrock or groundwater was enc,ountered.
The rnaterials encountered in Test Pit #4 consisted of medium brown clay loam to 3.O-feet, underlain by
light brown sand to a maximum depth explored of 6.0-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 soilformed a ball and a ribbon 1 to 2-inches in length before breaking. Soil structure
shape was blocky and consistence was firm to extremely firm. Soiltexture was both gritty and smooth.
A sample of the soil was taken from Test Pit#z at 3-feet below grade. Soil structure grade was loose.
The soil formed a ball but no ribbon. Soil structure shape was single-grain. Soiltexture was gritty.
We have researched soils in the area through USGS Web SoilSurvey. The report is enclosed. The area of
the proposed STA is identified by map unit symbol 13. The map unit name is Atencio-Azeltine complex, 3 to
6% slopes. Typical soil profile consists of 0 to 10 inches sandy loam, 10 to 20 inches sandy clay loam, 20
to 30 inches gravelly sandy loam, and 30 to 60 inches very gravelly sand.
Soils were variable in the area the test pits were excavated. The upper horizon of soil was consistent
with Soil Type 3, Clay Loam. Underlying soils were consistent with Soil Type 1, Loamy Sand. Given the
variability and Soil Type 1 below, we are conservatively sizing the STA based on Soil Type 2 and utilizing
sand below the distribution technology. A long-term acceptance rate (LTAR) of 0.6 gallons per
square foot will be used to design the STA.
Test Pit #1 (Test Pit #1 in the area of the proposed ADU)
' Carla Ostberg holds a Certificate of Aftendance and Examination from the CPOWVisualand Tactile
Evaluation of Soils Training.
Page 3
Test Pit #1 / sand below 5'
Page 4
Sieved sample from Test Pit#1 at 3' I Clay Loam
Horizon of dense clay loam from 2' to 5'View of proposed STA location from Test Pit #1
Page 5
$S:,r
Looking at Test Pit #2 from Test Pit #1 Test Pit #2 loamy sand
.' ,;.t tr:,
.'e. - ."r'
Test Pit #2
Page 6
Sieved sample from Test Pil#z
Test Pit #3 Backfill from Test Pit #3
Page 7
Test Pit #4 / sand below 3'
Backfillfrom Test Pilffi Soils below 3' in Test Pit #4
DESIGN SPECIFICATIONS
Desion Calculations:
Average Design Flow = 75 GPD x 2 people/bedroom x 3 Bedrooms = 450 GPD
LTAR = 0.6 GPD/SF
450 GPD / 0.6 GPDISF = 750 SF
750 SF x 1.2 (gravity bed) x 0.7 (GeoMatrM over min. 6" sand filter material)
Page 8
The OWTS design is based on 3-bedrooms. An average daily wastewater flow of 450 GPD will be used
For the purposes of this OWTS design, Benchmark Elevation has been established as '100' (Finished
Floor of ADU). 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. 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
2o/o grade to the septic tank.
The system installation must include a 100O-gallon, two-compartment lnfiltrator@ poly septic tank with an
Orenco@ Biotube effluent filter on the outlet tee. 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.
A minimum of 6-inches of sand filter material must be placed in the 10' x 63' bed excavation. The bed
should be excavated to a depth below the clay loam horizon. We recommend the GeoMatrM be
placed no deeper than 3' below finished grade. Additional excavation and sand may be necessary. This
office must be contacted to conduct an "open hole" inspection prior to placement of the sand
filter material. Sand filter material must be clean, coarse sand, all passing a screen having four meshes to
the inch. The sand must have an effective size between 0.15 and 0.60 mm. The uniformity coefficient must
be 7.0 or less. Material meeting ASTM 33, for concrete sand, with three percent or less fines passing 200
mesh sieve may be used. A gradation of the sand media must be submitted to this office prior to
obtaining the sand.
Three 39-inch wide GeoMatrM sheets must be placed on the sand filter. A 4-inch diameter SDR-35 level
manifold must be installed to connect each row of 4-inch diameter perforated laterals. Three 4-inch
diameter perforated pipe laterals will be placed down the center of the GeoMatrM, under the top layer of
gray soil separation fabric. All materialassociated with the GeoMatrM installation must be proprietary
products associated with the GeoMatrM, including the geotextile fabric. Manufacturer instructions must be
followed regarding installation of the GeoMatrM.
lnspection ports must be tied to the end of each lateral. Four additional inspection ports should be
placed in each corner of the bed, into the sand filter material. Ports may be cut to grade and placed in
sprinkler boxes for access. There shall be no cobble-sized (<2.5") or greater rock in final cover over the
GeoMatrM.
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 submifted, in writing, to our office for approval prior to installation. Component technical data
sheets are available upon request.
OWTS Component Minimum Elevation
Primary Tank lnlet lnvert Approximate horizontaldistance 15'i min. 2o/ofall I
min. 3.75" fall
lnfiltrative Surface Approximate horizontal distance 22' I min. 1o/o fall
to STA / min. 2.75" fall
Page 9
Construction must be according to the jurisdiction's adopted On-Site Wastewater Treatment System
Regulations, the OWTS Permit, and this design.
PERMIT APPLICATION INSTRUCTIONS
An OWTS Permit Application must be submitted to Garfield County Environmental Health Department.
https://www.oarfield-countv.comlenvironmental-health/filesgcco/sites/16/0WTS-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, 970-945-6614 xBl 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 condilions in this design or coun$ 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
GBO 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 REQUIREMENTS
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.
GOMPONENT MANUFACTURER MODEL NO COMMENTS
Septic Tank lnfiltrator@ tM-1060-2CP 1 000-gallon, two-compartment
septic tank
Biotube Effluent Filter Orenco€)FullSize 4" Diameter Effluent
Filter and housino
Risers and Lids Orenco@ Double-walled risers and
insulated lids
GeoMat''GeoMatrix Systems,
LLC
189'GeoMalr'"t 139")
Page l0
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 mainlenance.
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 additionalwater is being discharged to OWTS. For example, a
running toilet or leaky faucet can discharge hundreds of gallons of water a day and harrn 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 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.
(;tr', ht (-::{tll t ', q
i)
Carla Ostberg, MPH, REHS
Page l0
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.
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 eircuits. 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.
("')r.rr-, [tx L':t4 #.t'^, g
Carla Ostberg, MPH, REHS
Map Unit Description: Atencio-Azeltine complex, 3 to 6 percent slopes--Aspen-Gypsum Area,
Colorado, Parts of Eagle, Garfield, and Pitkin Counties
Aspen-Gypsum Area, Colorado, Parts of Eagle,
Garfield, and Pitkin Counties
13-Atencio-Azeltine complex, 3 to 6 percent slopes
Map Unit Setting
National map unit symbol: jq4y
Elevation: 5,900 to 6,500 feet
Mean annualprecipitation: 15lo 18 inches
Mean annual air temperature: 44 to 46 degrees F
Frost-free period: 105 to 120 days
Farmland classification: Not prime farmland
Map Unit Gomposition
Atencio and similar so/s: 60 percent
Azeltine and similar soils: 30 percent
Minor components: 10 percent
Estimates are based on obseruations, descriptions, and transects of
the mapunit.
Description of Atencio
Setting
Landform: Terraces, alluvial fans
Landform position (thrce-dimensional) : Tread
Down-slope shape: Linear
Across-s/op e sh ape : Linear
Parent material: Alluvium derived from sandstone and shale
Typical profile
ffi - A b 10 inches: sandy loam
H2 - 1A b 2a inches: sandy clay loam
H3 - 20 to 30 inches: gravelly sandy loam
H4 - 30 to 60 inches: very gravelly sand
Properties and qualities
Slope:3to6percent
Depth to restrictive feature: More than 80 inches
Drainage c/ass: Welldrained I
Runoff class: Medium
Capacity of the most limiting layer to transmit water
(Ksat): Moderately high to high (0.20 to 2.00 in/hr)
Depth to water table: More than 80 inches
F requency of floodlng: None
Frequency ofpondtng: None '
Calcium carbonate, maximum content: 10 percent
Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0
mmhos/cm)
Available water supply, 0 to 60 inches: Low (about 4.9 inches)
lnterpretive groups
La nd ca p abil ity cl assificatio n (i nig ated): 4s
USDA
-
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12t18t2023
Page 1 of3
Map Unit Description: Atencio-Azeltine complex, 3 to 6 percent slopes--Aspen-Gypsum Area,
Colorado, Parts of Eagle, Garfield, and Pitkin Counties
Land capability classification (nonirrigated): 4s
Hydrologic Soil Group: B
Ecologicalsde: R048AY306UT - Upland Loam (\Atloming Big
Sagebrush)
Other vegetative classification: Rolling Loam (null_60)
Hydric soil rating: No
Description of Azeltine
Setting
Landform: Alluvial fans, terraees
Landform position (tlz ree-dimensional) : Tread
Down-slope shape: Linear
Across-slop e sh ape : Linear
Parent material: Alluvium derived from sandstone and/or alluvium
derived from shale
Typical profile
ffi - A b I inches: gravelly sandy loam
H2 - I to 16 inches: gravelly loam
H3 - 16 to 60 inches: extremely gravelly sand
Properties and qualities
S/ope:3to6percent
Depth to restrictive feature: More than 80 inches
Drainage class: Well drained
Runoff class; Medium
Capacity of the most limiting layer to transmit water
(Ksat): Moderately high to high (0.60 to 2.00 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
F requeney of ponding: None
Calcium carbonate, maximum content: 10 percent
Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0
mmhos/cm)
Available water supply, 0 to 60 inches: Very low (about 2.4 inches)
lnterpretive groups
Land capability classification (inigated): 4s
Land capability classification (noninigated): 4s
Hydrologic Soil Group: B
Ecologicalsife: R048AY306UT - Upland Loam (Vlloming Big
Sagebrush)
Other vegetative classification: Rolling Loam (null-60)
Hydric soi/ rafing: No
Minor Components
Other soils
Percent of map unft: 1A percent
USDA
-
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12t18t2023
Page 2 of 3
Map Unit Description: Atencio-Azeltine complex, 3 to 6 percent slopes--Aspen-Gypsum Area,
Colorado, Parts of Eagle, Garfield, and Pitkin Counties
Hydric sotT raf,ng: No
Data Source lnformation
Soil Survey Area:
Pitkin Counties
Survey Area Data
Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and
Version 14, Aug 23,2023
p$Natural Resources
Gonservation Service
Web Soil Survey
National Cooperative Soil Survey
12t'18t2023
Page 3 of 3
Soil Map-Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties
Map Unit Legend
GlqFublic,Jt€t'" Garfield Cou nty, Co
Overview
J
L
-J-
Account
Number
Parcel Number
Acres
Land SqFt
TaxArea
2019 Mill tevy
R090199 Physical
Address
246303440040
2 OwnerAddress
0
oo9
80.9940
2s10133 HWY
CARBONDALE
MULLETT, PETERC
2510 HIGHWAY 133
CARBONDALE CO
81623
2019Total Actual
Value
I
Legend
Parcels
Roads
Parcel/Account
Numbers
OwnerName
|]j Lakes & Rivers
- CountyBoundary
Line
$r,775,680 Last2Sales
Date Price
6/30/2006 $840,000
7/24/2NL $s85,000
81623
Date created:9f612423
Last Data Uploaded:9/6/2023 2:06:17 AM
Deve roned bv$ F."Xtgn$gt
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Sketches
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ActualValues
AssssedYear
Land Actual
lmprovement Actual
Tot lActual
Assessed Values
rAssessed Year
Land Assessed
lmprovement Assessed
Total Assessed
TaxHistory
TaxYear
Taxes Billed
Click hereto view thetax information forthis oarcel on the Garfield CountvTreasurer's website
Transfers
qFuDflc.nel - banrelo \,ounry, t u - rrcrpefty Kecoru uaro: Kuvulyy
m23
$916,980.00
$798,700.00
$1,715,6$.00
2023
$52,030.00
$54,030.00
$116,060.00
2022 2027
$s,842.08 $5,915.80
Recefiion Number
9757L7
976L16
7gr3€z
701ffi4
6W628
585004
585003
550561
28782A
Sale Date
512u2022
512U2022
6/30noo6
6t26/2@6
3/25t20A2
712412007
7/24/2007
8/l1t1999
6/9/1978
DeedTypc
QUITCLAIM DEED
AFFIDAVIT
WARRANTYDEED
STATEMENT OF AUTHORITY
QUITCLAIM DEED
QUITCI.AIM DEED
WARRANTYDEED
SPECIALWARRANWDEED
WARRANryDEED
Book- Page
La76-927
1816-933
74.3-454
t277-6s2
L277-629
7M5-446
0514-0359
2022
$375,000.00
$552,860.00
$1,O37,860.CD
2022
$26060.00
$46,070.00
$72,!30.6
2020
$5,M724
2UL
$37s,000.00
$662,860.00
$1,037,860.00
202L
$26,810.00
$47,390.0o
$74,2onoo
20L9
$s,09215
$20,5O0
$840,0tr1
Price
$o
$o
Sale
$o
$o
$o
$o
$58s,000
Propefi Related Public Documents
Click heretc view Prope(y 3Cb!e{_EC!!tS_Docu@!g
Photos
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vrolz5, v:c/ AM
Summary
Account
Parcel
PropertyAddress
Legal Description
Acres
Land SqFt
fbxArea
MlllLevy
Subdivision
Garfield County, CO
qruollc,nel - \rafflelo UOUnty, L,U - rrc,peny i(ecoro Larg: KUVU1vv
R090199
245303400040
2510 133 HWY, CARBONDALE, CO 81623
Section:3 Township:8 Range 8€ ATR lN LOT 16. EXCEPT ATR DESC.854/58.2.48 ACRES
2.48
0
I
80.99lm
'.1r&
View Mao
Owner
MULLETI, PETERC
2510H|GHWAY133
CARBONDALE CO 81623
Land
UnitType SINGLE FAM.RE5.-LAND - 1112 (RESIDENTIAL PROPERTY)
SquareFeet 0
Buildings
Bulldlng#
Units
BuildingType
Abstract Codes / tPropertyTypel
Archit€ctural Style
Storles
Frame
Actual Year Built
BasementArea
Finish Basement Area
Gross LlvingArea
Total Heated SqFt
Bedrooms
Baths
Heating Fuel
HeatlngType
AirConditioning
RoofType
RoofCover
1
7
SFR
SINGLE FAM.RES.IMPROVEMTS-1212lRESIDENTIAL PROPERTY)
1-STRY/BSM
1
WOODFMME
1979
7,596
1,452
7,760
3,272
4
J
ELECTRIC
ELEC BSBD
NONE
RIDGE FRME
PREFABMFT
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* Well Constructed
r Final Permit
L_] county
Legend
I c
_rt
L :l!
Location
Notes
585 0 292 585 Feet fi This product is for informational purposes and may not have been prepared for, or be suitable for legal,
engineering, or surveying purposes. Users of this information should review or consult the Nimary data and
information sources to asceftain the usabiltty of the information.
Date Prcpared: L211512O23 1:34:13 PML: 3,508
30'ROAD EASEM
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DRAWINGS MUST BE USED IN
CONJUNCTION WITH DESIGN
LETTER DATED 1211512023 1'- 5d-0!
CBO lnc.
129 Cains Lane
Carbondale, Colorado 81623
Phone 970.309.5259
carla.ostberg@gmail.com
Mullet ADU
2510 Hvuy 133
Garfield County, Colorado
Proiest Number: C1836
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4" DIA PERFRATED PIPE LATEML PLACED ON TOP OF,zt{\,a -/'TP: #
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GRAVITY GEOMAT 10'X 63'WITH 6'OF SAND ON WITH 3
ROWS OF 39'GEOMAT. DEPTH OF BED TO
APPROXIMATELY 2' BELOW GRADE.
SHALLOW,
Sr-AB
BARN
4" DIA SDR-35 INSPECTION PORT AT FRONT CORNERS
u\
4" DIA SDR-35 PVC LEVEL MANIFOLD?\
4'DIA SDR.35 SEWER LINE TO STA
(MrN. 1% FALL TO STA),1\
1 2so-GALLON, TWO-COMPARTMENT
SEPTIC TANK WITH EFFLUENT SCREEN
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Mullet ADU
2510 Hwy 133
Garfield County, Colorado
Proiect Number: C1836
4' DIA SDR-35 SEWER PIPE WITH CLEANOUT
MIN 2% FALL TO TANK
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CBO lnc.
129 Cains Lane
Carbondale, Colorado 81 623
Phone 970.309^5259
carla.ostberotOomail.com
lN. 10'
3-BEDROOM ADU
FF = 100'
a
,
Membrane
Transmissive
Hygroscopic Membrane
4'DIA
PVC LEVEL
MANIFOLD
4' DrA SDR-35
EFFLUENT PIPE FROM
SEPTIC TANK
INSPECTION PORT AT FRONT
CORNERS OF BED
Finished Grade
l2" Minimum Cover
4" Distribu:ion Pipe
39*
/AGEOMAT BED PLAN
tgr m sc lE
Fabric
6" SAND
/?\LATERAL SECTION\y
lnspection Port'
Distribution
Pipe
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A GEOMAT SECTION
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CBO lnc.
129 Cains Lane
Carbondale, Colorado 8'1 623
Phone 970.309.5259
carla. ostberq@o mail.com
Mullet ADU
2510 Hwy 133
Garfield County, Colorado
Proiect Number: C1836
CALCULATED STA = QI/LTAR = 45Q I0,6 = 750 SF
GRAVlry, BED = 750 SF X 1.2 = 900 SF
GEOMAT OVER MlN. 6" SAND = 900 SF X 0.7 = 630 SF
10'x 63' BED (3 SHEETS OF GEOMAT OVER MrN.6" SAND)
SOIL PROFILE TEST PIT NO. 1
MEDIUM BROWN CLAY LOAM
MEDIUM BROWN CLAY LOAM WITH
WEAK STRUCTURE GMDE
LIGHT BROWN LOAMY SAND
BEDDING
SOIL PROFILE TEST PIT NO.2
DARK BROWN LOAM
LIGHT BROWN LOAMY SAND
/-1so]Ls LOG
8" MtN.
A TRENCH DETAIL
Mullet ADU
2510 Hvqy 133
Garfield County, Colorado
Proiect Number: C1836
iloT 10 sc E
SOIL PROFILE TEST PIT NO.3
MEDIUM BROWN CLAY LOAM
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NO GROUNDWATER OR BEDROCK ENCOUNTERED
DURING EXCAVATION
CBO lnc,
129 Cains Lane
Cadcondale, Colorado 81623
Phone 970.309.5259
carla.ostbero@omail.com
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Soil Map-Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties
310170 310190 31t810 31r'fo 31m50310110310130
310110
Natural Resources
Gonservation Service
310150 31@70 31@ 31t810
39P 23 I'N
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39p 23'g N
fi
5
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s
fi
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fiE
fi
F
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F
sts
m
p
Fp;
310150 310170 310190
Map Scale: 11979 ifprjnted on A landscap (11" x 8.5) sheet
f4ebrs010?01060
Feet0 45 90 180 7n
Map projection: \ /bb l4ercabr ComercordinaE: WGS84 Edg€ tics: UITq Zone 13N WGS84
310130 31@10
Web Soil Survey
National Cooperative Soil Survey
31610
=
N
N
3
b
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USDA
-
12t18t2023
Page 1 of3
39p 23', 3" N
3lm0 31@50 31@'70 31@S
39 23'.3N
USDA
-
Natural Resources
Conservation Service
Soil Map-Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties
Web Soil Survey
National Cooperative Soil Survey
12t18t2023
Page 2 of 3
MAP LEGEND MAP INFORMATION
The soil surveys that comprise yourAOl were mapped at
1:24,000.
\Afarning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Aspen-Gypsum Area, Colorado, Parts of
Eagle, Garfield, and Pitkin Counties
Survey Area Data: Version 14, Aug 23,2023
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger"
Date(s) aerial images were photographed: Aug 25, 2021-Sep
5,2A21
The ofthophoto or other base map on which the soil lines were
compiled and digitized probably difiers from the bac(ground
imagery displayed on these maps" As a result, some minor
shifting of map unit boundaries may be evident.
Area of lnterest (AOl)
E Area of lnterest (AOl)
Soils
n Soil Map Unit Polygons
r.!'ri Soil Map Unit Lines
I Soil Map Unit Points
Special Point Features
f&l Blowout
ffi Borrow Pit
X Clay Spot
"::: Closed Depression
,H Gravel Pit
,'. Gravelly Spot
# Landfill
,,_ Lava Flow
"i, Marsh or swamp
-:F Mine or Quany
& Miscellaneous Water
& Perennial \ /bter.
r..i Rock Outcrop
+ Saline Spot
:.; Sandy Spot
5'. Severely Ercded Spot
i} Sinkhole
f.:, Slide or SliP
@ sodic spot
g Spoil Area
$"9 Stony Spot
tjl5 Very Stony Spot
frl Wet SPot
.* Other
Water Features
Streams and Canals
Transportation
ffi Rails
Fi, lnterstate Highways
&a US Routes
Major Roads
Local Roads
Background
I Aerial Photography
/ftrcc'1-
Page 9
Construction must be according to the jurisdiction's adopted On-Site Wastewater Treatment System
Regulations, the OWTS Permit, and this design.
PERMIT APPLICATION INSTRUCTIONS
An OWTS Permit Application must be submitted to Garfield County Environmental Health Department
https:/iwww.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 GONTRACTOR
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 additionalconditions 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 REQUIREMENTS
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.
L
COMPONENT MANUFACTURER MODEL NO COMMENTS
Septic Tank lnfiltrator@ tM-1060-2CP 1 000-9allon, two-compartment
seotic tank
Biotube Effluent Filter Orenco@ Full size 4" Dlameter Effluent
Filter and housino
Risers and Lids Orenco@ Double-walled risers and
insulated lids
GeoMatrM GeoMatrlx systems,
LLC
189,GeoMa1ru (39,,)