HomeMy WebLinkAboutEngineer's Design Plan129 Cerrus LANE
CRReoNronLE, CO A1623
970.309.5259
CARLA.oSTBERG@GMAIL, coM
sttl"l'I ( : ( :()Nst !I-'t.I i\(';
March 4,2024 Project No. C1869
Whit Whitaker
wrw3@hotmail.com
Subsurface lnvestigation and Onsite Wastewater Treatment System Design
Barn
11454 CR 115
Garfield County, Colorado
whit,
CBO lnc. performed a subsurface investigation and completed an onsite wastewater treatment system
(OWTS) design for the subject residence. The 4O-acre property is located outside of Glenwood Springs,
in an area where OWTSs and wells are necessary.
Legal Description: Section: 6 Township: 7 Range: 87 A TRACK lN THE SESE. 40 ACRES
Parcel lD: 2391-064-00-146
SITE CONDITIONS
The property is currently undeveloped. A S-bedroom residence is proposed on the eastern portion of the
property. The OWTS that will serve the residence is described in a separate design (CBO lnc. Project
No. C1716, dated April 27 , 2022). A Barn near the northern property boundary with a toilet and sink and
a Recreational Vehicle (RV) dump (intended for limited use) is proposed.
The structures will be served potable water from a well on the property. The well is located over 400-feet
south of the Barn and is greater than SO-feet from the proposed septic tank and greater than 10O-feet
from the proposed soil treatment area (STA). No water line will come within 2S-feet of any OWTS
component.
The proposed soil treatment area (STA) location has an approximate 7 to I percent slope to the east
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.
SUBSURFACE
The subsurface was investigated on March 1,2024 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
I Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile
Evaluation of Soils Training.
Page2
The materials encountered in Test Pit #1 consisted of dark brown loamy topsoil with a reddish brown
matrix to 4-feet, underlain by more dense, gray, clay loam to a maximum depth explored of 8.O-feet. No
bedrock or groundwater was encountered.
The materials encountered in Test Pit#2were similar to those encountered in Test Pit #1. Test Pit #2was
excavated to a maximum depth explored of 8.O-feet. No bedrock or groundwater was encountered.
A sample of the soilwas taken from Test Pit #1 at 3-feet below grade. Soil structure grade was
moderate. The soilformed a balland a ribbon less than 1-inch in length before breaking. Soilstructure
shape was blocky and consistence was firm. Soil texture was more both gritty and smooth.
A sample of the soil was taken from Test Pit #1 at 6Jeet below grade. Soil structure grade was
moderate. The soil formed a ball and a ribbon between 1 and 2-inches in length before breaking. Soil
structure shape was blocky. With depth, soils had more clay content.
The upper horizon of soil is consistent with Soil Type 2, Loam, with moderate structure grade. We are
proposing a very shallow installation in the Soil Type 2 horizon. For the purpose of sizing the STA, we
are using a more conservative long-term acceptance rate (LTAR) of 0.35 gallons per square foot.
Soils contain more clay with depth.
Test Pit #1
Page 3
Loamy topsoil (upper horizon)Backfill
Soils below 4-feet become more clayey and dense
Page 4
View of Test Pits #1 and#2 Test Pit #2
-.x?p",.
Arrow indicates change in soiltype at approx. 4-feet
Sieved sample Ribbon less than 1-inch (above 4-feet)
Page 5
DESIGN SPECIFICATIONS
Desion Calculations:
Average Design Flow = 200 GPD
LTAR = 0.35 GPD/SF
200 GPD / 0.35 GPD/SF = 656.25 SF
The OWTS design an average daily wastewater flow of 200 GPD will be used. This is an estimated
design flow based on use of a toilet and sink in the Barn and occasional use from the RV dump. No
chemicals should be introduced into the OWTS.
For the purposes of this OWTS design, Benchmark Elevation at grade 7186' 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.
*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 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
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 trench.
Each trench will consist of '12 'Quick 4' Standard Plus Low Profile lnfiltrator@ chambers for a total of 36
chambers and 432 square feet of infiltrative area. We are recommending trenches be excavated no
more than 1-foot below native grade and the backfill mounded over the trenches. Mounding may tie
into the upgradient slope and there must be a minimum 3:1 slope downgradient. 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 Inc. 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.
OWTS Component Minimum Elevation
Primary Tank lnlet lnvert Approximate horizontal distance 14' I min. 2% fall I
min. 3.5" fall
Distribution Box Approximate horizontal distance 5'l min. 1%fall I
min. 6.25" fall
lnfiltrative Surface Approximate horizontal distance 16' to furthest
trench / min. 1o/o fall lo STA / min. 2" fall
Page 6
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.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 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 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.
COMPONENT MANUFACTURER MODEL NO COMMENTS
Septic Tank lnfiltrator@ tM-1060-2CP 1000-9allon, 2-
compartment poly septic
tank
Effluent Filter Orenco@ 4-inch diameter, full size
Tank Risers and Lids Orenco@ Double-walled PVC Rtsers and
Lids (24" diameter)
Distribution Box Polylok Distribution box, risers, lids,
and flow equalizers (3)
chambers lnfiltrator@ 'Quick 4' Plus Standard
Low Profile
36 Low Profile Chambers
Page 7
REVEG ETATION 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.
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 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.
Page 8
Please call with questions
Sincerely,
CBO lnc.
Carla Ostberg, MPH, REHS
(s"nb oxfu-,^'g
DMWINGS MUST BE USED IN
CONJUNCTION WITH DESIGN..
LETTER DATED O3IO4I2O24
CBO lnc.
129 Cains Lane
Carbondale, Colorado 81623
Phone 970.309.5259
carla.ostberg@gmail.mm
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EXISTING
EXISTING RANCH
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(APPROX.)
WELL LOCATED APPROX.400'SOUTH
THE LOCATION OF PROPOSED IMPROVEMENTS SHOWN ARE NOT THE
RESUL OF PROPERTY SURVEY THE LOCA TIONS.\ lT ls THE HOt\4EOWNERS' DUTY TO ENSURE ALL CONSTRUCTION AND
IMPROVEMENT LOCATIONS ARE ACCURATE, PROPERry LINES AND
SETBACK DISTANCES SHOULD BE CONFIRMED PRIOR TO EXCAVATION.
SCALED FOR PRINTING ON 11'X 17'PAPER.
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Whitaker Barn
1 1454 CR 115
Garfield County, Colorado
ProjectNumber: C1869
Date: O3lO4l2O24
Designed by: CBO
Drawn by: DD
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CBO lnc.
129 Cains Lane
Carbondale, Colorado 81623
Phone 970.309.5259
carla.ostberg@gmail.com
Whitaker Barn
1 1454 CR 1 15
Garfield County, Colorado
ProjectNumber: C1869
Date: 0310412024
Designed by: CBO
Drawn by: DD Sheet 2 0F 4
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'QUICK.4' LOW PROFILE CHAMBER TRENCHES.
3 TRENCHES WITH 12 CHAMBERS PER TRENCH
FOR A TOTAL OF 36 CHAMBERS AND
432 SF.\,r\
4" DIA SDR.35 SEWER PIPE WITH CLEANOUT
MIN 2OlO FALL TO TANK
MtN. 10'TO LINE
EXISTING BARN
FF 7186'(BM 100')
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TP 4' DIA SDR-35 INSPECTION PORT AT
BEGINNING AND END OF EACH TRENCH
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DISTRIBUTION BOX
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CBO lnc.
129 Cains Lane
Carbondale, Colorado 8 1623
Phone 970.309.5259
mrla.ostberg@gmail.@m
Whitaker Barn
1 1454 CR 1 15
Garfield County, Colorado
ProjectNumber: C1869
03t04t2024
by: DD
by: CBO
Sheet 3 0F 4
w3.0
4' DIA SDR.35 SEWER
LINE TO EACH TRENCH
(MrN. 1%o SLOPE TO
TRENCH)4' DIA SDR-35
EFFLUENT PIPE FROM
SEPTIC TANKINFILTRATOR
END PLATE
GRAVELLESS'QUICK4'
LOW PROFILE CHAMBER (4'xg)
DISTRIBUTION BOX WITH
ACCESS AT GMDE
TIE GRADE INTO UPGRADIENT
HILLSIDE FILL
NEW GRADE
MIN. '1' COVER OVER CHAMBERS
FROI/I HOUSE
EXCAVATION
DIA SDR-35
INSPECTION
PLACED IN
NATIVE4'.TOP PORT OF
CHAI/IBER END
PLATES
NOTE: MlN. 3:1 SLOPE TO TIE
INTO DOWNGRAOIENT
HILLSIDE1'max
L sotL
DIA SDR-35 INSPECTION height
PORTAT BEGINNING AND
END OF EACH TRENCH EXCAVATION
SCARIFY
'ourcK4' Low
PROFILE CHAMBER (4'x 3')
/iSTA PLAN MEW\lr-rdndtr /iCHAMBER TRENCH SECTION\3r--rftffi
SMIL VALVE COVER
BOX OR IRRIGATION
VALVE BOX AT GRADE
FINISHED GRADE
CAP OR THREADED BOX AND COVER BROUGHT TO GRADE
CLEANOUT ASSEMBLY
24'MtN.CONCRETE LID-\...
COMPACT 4'DIA SDR-35 SEWER LINE
(MtN 2olo SLOPE TO TANK,
MrN. 1olo TO STA)
.-GRAD-
BASE TO SUPPORT
BOX
PVC PIPE CUTTO
FIT
USE HOLE SAW TO
CUT THRU TOP OF SCREENED
END OR SAND FOR
AEDDING
3'MtN.
8" MIN
BAFFLE OR
ANGLED PIPE
/iDISIRIBUTION BOX\gr-rffi
TO BE USED
AT INLET
/AIRENCH DETAIL\9,-_-......ffffi
/ADIS1RIBUNON BOX DET\9r-==-r6r-ffi AIL
,12 CHAMBERS PERTRENCH z
OUTLETS
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CBO lnc.
129 Cains Lane
Carbondale, Colorado 81623
Phone 970.309.5259
carla.ostberg@gmail.com
Whitaker Barn
1 1454 CR 1 15
Garfield County, Colorado
ProiectNumber: C1869
Date: O3lO4l2O24
Drawn by: DD
by: CBO
w4.0
Sheet 4 0F 4
DESIGN OWTS COMPONENTS AND MINIMUM REOUIRED
SETBACK
APPROXIMATE PROPOSED
EXISTING BARN WTH BATHROOM
DESIGN FLOW = 200 cPD
STA TO WATER COURSE 50'N/A
STA TO WELL 100'477',
STA TO BARN '10'21
SEPTIC TANK TO WATER COURSE 50'N/A
SEPTIC TANK TO WELL 50'455'
BARN TO SEPTIC TANK 5'10'
TANK:
MIN. lOOO GALLONS
USE lOOO-GALLON, TWO.COMPARTMENT POLY SEPTIC TANK
SOIL TREATMENT AREA (STA):
LONG TERM ACCEPTANCE RATE (LTAR) = 0.35 GAU SF
CALCULATED STA = Q|/LTAR = 200 / 0.35 = 571 SF
GRAVlry, TRENCHES = 200 SF x 1.0 = 571 SF
CHAMBERS = 571 SF X 0.7 = 4OO SF / 12 SF / CHAMBER = 34 CHAMBERS
THREE GMVELLESS CHAMBER TRENCHES
12'QUICK 4'CHAMBERS IN EACH TRENCH
TOTAL 36 'QUICK 4' CHAMBERS
SOIL PROFILE TEST PIT NO. 1 SOIL PROFILE TEST PIT NO.2
0
DARK BROWN LOAM WITH REDDISH
BROWN MATRIX
DARK BROWN LOAM WITH REDDISH
BROWN MATRIX
3
FuUI
IF
0-uo
4
6
7
8
9
10
GRAY CLAY LOAM GRAY CLAY LOAM
SLIP.ON PVC
DO NOT GLUE
INSULATED
LEGEND
F loamy
topsoil
V ctay
loam
TMCERWIRE FINISHED GRADE
4'DIA
NO GROUNDWATER OR BEDROCK ENCOUNTERED
DURING EXCAVATION
SEWER LINE
TO TANK HOUSE
/A SOILS LOG\3r--6r-16ffi /iCLEAN OUT DETAIL
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Overview
I
Legend
[---l Parcels
Roads
Parcel/Account
Numbers
Highways
: Limited Access
- Highway
Major Road
Local Road
Minor Road
Other Road
Ramp
Ferry
Pedestrian Way
Owner Name
Lakes & Rivers
- County Boundary
Line
$2,200 Last2sales
Date Price
9/70/2020 $O
9/70/2O2O $O
Account R7t752O Physical O 2ol9TotalActual
Number Address Value
Parcel Number 239tO64OOt46 CARBONDALE 81623
Acres 40 OwnerAddress WHITAKER,WALTERRIII&SOPHIE
LandSqFt 0 R
TaxArea 011 IOO9CATTLECREEKR|DGE ROAD
2019 Mill Levy 79.7760 CARBONDALE CO 87623
D ate cr e ate d: 4 / 28 / 2O22
Last Data Uploaded: 4/28/2022 2:73:49 AM
4128122,1:42 PM qPublic.net - Garfield County, CO - Property Record Card: R111520
G)qPublic.net'" Garfi eld County, CO
Summary
Account
Parcel
Property
Address
Legal
Description
Acres
Land SqFt
Tax Area
Mill Levy
Subdivision
R111520
239!06400746
,CARBONDALE,CO 87623
Section: 5 Township: 7 Range: 87 ATRACK lN THE SESE.40
ACRES
40
0
7t
79.7760
View Map
Owner
WHITAKER.WALTER R III&SOPHIE R
1OO9 CATTLE CREEK RIDGE ROAD
CARBONDALE CO 81623
Land
Unit Type
Square
Feet
Actual Values
Assessed Year
Land Actual
lmprovement Actual
Total Actual
Assessed Values
Assessed Year
Land Assessed
lmprovement Assessed
Total Assessed
Tax History
Tax Year
Taxes Billed
Sale Date
9/70/2020
9/lO/2020
9/70/2020
9/9/2020
9/9/2020
6/24/20tt
6/22/2017
9/4/2002
9/4/2002
9/4/2002
9/4/2002
4/t9/2002
GRAZING LAND-AGRICULTURAL. 4147 (AGRICULTURAL
PROPERTY)
0
2027
$s1.04
2020
$46.08
2079
$46.48
202t
$2,2OO.OO
$0.00
$2,200.oo
2021
$640.00
$o.oo
$640.00
2078
$44.60
2020
$2,110.00
$o.oo
$2,r10.00
2020
$610.00
$o.oo
$610.00
20t7
$42.64
Click here to view the tax information for this p=Eel-9!$S-G4ie!g!@v&agC-tg5ryS!gile.
Transfers
Deed Type
Right Of Way Easement
Right Of Way Easement
Right Of Way Easement
SPECIAL WARRANry DEED
STATEMENT OF AUTHORITY
WARRANTY DEED
STATEMENTOFAUTHORIry
QUITCLAIM DEED
QUIT CLAIM DEED
QUITCLAIM DEED
WARRANry DEED
AGREEMENT
Reception Number
?4?746
948265
942556
947698
947697
804305
804306
6ro240
6ro239
670238
6ro237
6VZJ5J
Book - Page Sale Prlce
$o
$o
$o
$s2s,000
$o
$47s,000
$o
$o
$o
$o
$33s,000
$o
1384-110
1384-108
1"384-106
1384-702
1350-595
https://qpublic.schneidercorp.com/Application.aspx?ApplD=1038&LayerlD=22381&PageTypelD=4&PagelD=9447&Q=566230598&KeyValue=R111520 112
4128122,1:42PM qPublic.net - Garfield County, CO - Property Record Card: R111520
4/70/2002
!t/77/1994
9/3/7993
2/28/7990
3/L5/7989
7/22/1984
4/L6/1984
7/3u1983
u37/7983
70/25/r977
9/6/t977
AGREEMENT
WARRANWDEED
WARMNTYDEED
SPECIALWARRANTY DEED
QUITCLAIM DEED
COURT DECREE
RESOLUTION
DEED
RESOLUTION
QUITCLAIM DEED
WARRANTY DEED
6023s!
47rr58
452774
4ro363
400692
355277
357445
337987
33797A
281482
280637
1350-598
0923-OO23
o874-0785
o773-0822
0752-0369
0655-0987
0647-0993
0619-0504
o6t9-0467
o502-0275
o500-0654
$o
$1s8,000
$80,000
$2,0s0,000
$o
$o
$o
$o
$o
$o
$o
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