HomeMy WebLinkAboutOWTS Design33 Four Wheel Drive Road
Carbondale, CO 81623
970.309.5259
carla.ostberg@gmail.com
May 31, 2021 Project No. C1601
Tom Fisher
tomfisher@rocketmail.com
Subsurface Investigation and Onsite Wastewater Treatment System Design
4-Bedroom Residence
Lot 16, Panorama Ranches
TBD Basalt Mountain Road
Garfield County, Colorado
Tom,
CBO Inc. performed a subsurface investigation and completed an onsite wastewater treatment system
(OWTS) design for the subject residence. The 5.027-acre property is located outside of Carbondale, in
an area where OWTSs are necessary.
Legal Description: Section: 16 Township: 7 Range: 87 Subdivision: PANORAMA RANCHES 1ST
AMENDED HOMESTEAD 16, 2ND AMD FINAL PLAT OF HOMESTEADS 16 & 17 REC# 773495; 5.028
ACRES
Parcel ID: 2391-162-01-016
SITE CONDITIONS The property is undeveloped. A 4-bedroom, single-family residence is proposed.
A corral is proposed to the south of the residence.
The residence will be served potable water from a community water system. The water line will enter the
residence from the south. The waterline will not come within 10-feet of the septic tank or within 5-feet of
the sewer line.
The proposed soil treatment area (STA) location will be to the north of the residence. The area has an
approximate 12 percent slope to the southwest.
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 May 5, 2021 by digging three soil profile test pit excavations (Test Pits).
A visual and tactile soil analysis was completed by Carla Ostberg at the time of excavation.1
The materials encountered in Test Pit #1 consisted of medium brown clay loam to a maximum depth
1 Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile
Evaluation of Soils Training.
Page 2
explored of 6.5-feet. Digging below 4.0-feet was difficult. No bedrock or groundwater was encountered.
The materials encountered in Test Pit #2 consisted of medium brown clay loam to a maximum depth
explored of 6.0-feet. Digging below 3.0-feet was difficult. No bedrock or groundwater was encountered.
The materials encountered in Test Pit #3 consisted of dark brown topsoil to 1.5-feet, underlain by medium
brown loam to a maximum depth explored of 6.5-feet. Soils were sandier with more gravels with depth.
No bedrock or groundwater was encountered.
A sample of the soils was taken from Test Pit #3 at 3-feet below grade. Soil structure grade was
moderate. The soil formed a ball and a ribbon less than 1-inch in length before breaking. Soil structure
shape was blocky and consistence was friable. Soil texture was both gritty and smooth.
STA sizing is based on Soil Type 2, Loam with moderate structure grade. A long term acceptance rate
(LTAR) of 0.6 gallons per square foot will be used to design the OWTS.
Test Pit #1 Backfill
Page 3
Test Pit #2
Page 4
Sieved sample Ribbon a little over 1-inch in length
Test Pit #2
Page 5
Test Pit #3
Sieved sample Ribbon approx. 1-inch in length
Page 6
Test Pit #3 / sandier and more gravels with depth
DESIGN SPECIFICATIONS
Design Calculations:
Average Design Flow = 75 GPD x 2 people/bedroom x 3 Bedrooms + 75 GPD= 525 GPD
LTAR = 0.6 GPD/SF
525 GPD / 0.6 GPD/SF x 1.0 (pressure dosed beds) x 0.7 (chambers) = 613 SF
The OWTS design is based on 4-bedrooms. An average daily wastewater flow of 525 GPD will be used.
For the purposes of this OWTS design, Benchmark Elevation at grade 7346.5’ (basement slab) has been
established as 100’. CBO Inc. 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 Inlet Invert Approx. horizontal distance 15’ / min. 2% fall to
septic tank / min. 3.75” fall
Automatic Distributing Valve Approx. horizontal distance 177’ / min. 1% rise to
ADV / min. 22.125” rise
Infiltrative Surface Approximate horizontal distance 9’ / min. 1% fall to
STA / min. 1.125” fall
*Elevations are based upon standard OWTS installation practices. Component elevations may change during
installation due to site conditions.
The sewer line exiting the residence must have a double-sweep clean out and a minimum 2% grade to
the septic tank.
The system installation will include a 1500-gallon, two-compartment poly Infiltrator® septic tank with an
Orenco® Biotube Effluent Filter on the outlet tee followed by a 500-gallon, single-compartment poly
Infiltrator® pump chamber with an Orenco® Biotube Pump Vault and an Orenco® PF3005. The floats
should be set to dose approximately 80 gallons each pump cycle, allowing approximately 24 gallons of
drain back after each pump cycle. A pump curve is enclosed. The control panel for the pump must be
Page 7
located within line of sight of the septic tank. We recommend Valley Precast out of Buena Vista be
contracted for start-up of the pumping system.
Pump Table
Dose Range Max = 149.25 gal. (525 GPD x
25% + 18 gal drain back)
Min. 62 gal. (11 gal x 4) + 18 gal
drain back
Dose Setting 80 gallons/dose 18 gallons drain back (177’ / 1.5”
diameter pump line)
Float Separation 500 gallon, single-compartment
Infiltrator® poly pump chamber
6.5” on/off float separation
Pump Criteria 24.4 gallons per minute (GPM) 35.3 feet total dynamic head
(TDH)
Effluent will be pumped through a 1.5-inch diameter pump line from the pump chamber an Orenco®
automatic distributing valve (ADV), model 6402. This pump line must have a minimum 1% grade for proper
drain back into the tank after each pump cycle. The ADV must be placed at a high point and be placed in an
insulated riser with access from grade. Screened rock must be placed below the ADVs to support the ADVs
and to assure the clear pipes exiting the ADVs remain visible for future inspection and maintenance.
Effluent will be pressure dosed through 1.5-inch diameter pipes to two beds, each with two rows of 13
‘Quick 4’ Standard Plus Infiltrator® chambers, for a total of 52 chambers and 624 square feet of
infiltrative area. There must be at least 6-feet of undisturbed soil between each bed. Effluent will be
pressure dosed to two 1.5-inch diameter level manifolds and 1.5-inch diameter laterals, which must be
hung with zip ties from the underside of the chambers. Laterals will have 5/32-inch diameter orifices
facing up, with the exception of the first and last holes facing down for drainage. Orenco® Orifice
Shields may be placed under each downward-facing orifice. The orifices must be placed 3-feet on
center. Each lateral must end in a 90 degree ell facing up with a ball valve for flushing. Valves may be
placed in a valve box, accessible from grade, for access. Inspection ports must be placed at each corner
of each bed. Ports may be cut to grade and covered with a valve box 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.
COMPONENT MANUFACTURER MODEL NO. COMMENTS
Septic Tank Infiltrator® Item # IM-1530-2CP 1500-gallon, 2-
compartment poly septic
tank
Effluent Filter Orenco® 4-inch diameter, full size
filter and housing
Pump Chamber Infiltrator® Item # IM-540-HH 500-gallon, single
compartment poly pump
chamber
Pump Orenco® PF300511 ½ HP
120 Volt
Biotube ProPak Pump Package Orenco® BPP30DD Vault, Filter, Control Panel (demand dose)
Tank Risers and Lids Orenco® Double-walled PVC Risers and Lids (24” diameter)
ADV Orenco® V6402A 1.5” Inlet and Outlets
Page 8
ADV Riser and Lid Orenco® Double-walled PVC Risers
and Lids (30” diameter) Orifice Shields Orenco® OS150 1.5 inch diameter (8 total) Flushing Assembly Orenco® 1.5” diameter (2) 45° or 90° long sweep only (4 total) Chambers Infiltrator® 52 ‘Quick 4’ Standard Plus
Construction must be according to Garfield County On-Site Wastewater Treatment System Regulations, the
OWTS Permit provided by Garfield County Building Department, and this design.
INSTALLATION CONTRACTOR
CBO Inc. 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 Inc. 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 Inc. should be notified 48 hours
in advance to observe the installation.
In 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.
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.
Page 9
6-9-2021
If an effluent filter or screen has been installed in the OWTS, we recommend this filter or screen be cleaned
annually, or as needed. If 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 If 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 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. If soil conditions encountered are different from conditions
described in report, CBO Inc. 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 Inc. Reviewed By:
Carla Ostberg, MPH, REHS Romeo A. Baylosis, PE
Pump Selection for a Pressurized System - Single Family Residence Project
C1601
Parameters
Discharge Assembly Size
Transport Length Before Valve
Transport Pipe Class
Transport Line Size
Distributing Valve Model
Transport Length After Valve
Transport Pipe Class
Transport Pipe Size
Max Elevation Lift
Manifold Length
Manifold Pipe Class
Manifold Pipe Size
Number of Laterals per Cell
Lateral Length
Lateral Pipe Class
Lateral Pipe Size
Orifice Size
Orifice Spacing
Residual Head
Flow Meter
'Add-on' Friction Losses
1.25
177
40
1.50
6402
3
40
1.50
14
3
40
1.50
4
52
40
1.50
5/32
3
5
None
0
inches
feet
inches
feet
inches
feet
feet
inches
feet
inches
inches
feet
feet
inches
feet
Calculations
Minimum Flow Rate per Orifice
Number of Orifices per Zone
Total Flow Rate per Zone
Number of Laterals per Zone
% Flow Differential 1st/Last Orifice
Transport Velocity Before Valve
Transport Velocity After Valve
0.68
36
24.4
2
1.7
3.9
3.9
gpm
gpm
%
fps
fps
Frictional Head Losses
Loss through Discharge
Loss in Transport Before Valve
Loss through Valve
Loss in Transport after Valve
Loss in Manifold
Loss in Laterals
Loss through Flowmeter
'Add-on' Friction Losses
4.2
6.3
5.4
0.1
0.0
0.2
0.0
0.0
feet
feet
feet
feet
feet
feet
feet
feet
Pipe Volumes
Vol of Transport Line Before Valve
Vol of Transport Line After Valve
Vol of Manifold
Vol of Laterals per Zone
Total Vol Before Valve
Total Vol After Valve
18.7
0.3
0.3
10.9
18.7
11.6
gals
gals
gals
gals
gals
gals
Minimum Pump Requirements
Design Flow Rate
Total Dynamic Head
24.4
35.3
gpm
feet
0 5 10 15 20 25 30 35 40
0
50
100
150
200
250
300
Net Discharge (gpm)
PumpData
PF3005 High Head Effluent Pump
30 GPM, 1/2HP
115/230V 1Ø 60Hz, 200V 3Ø 60Hz
PF3007 High Head Effluent Pump
30 GPM, 3/4HP
230V 1Ø 60Hz, 200/460V 3Ø 60Hz
PF3010 High Head Effluent Pump
30 GPM, 1HP
230V 1Ø 60Hz, 200/460V 3Ø 60Hz
PF3015 High Head Effluent Pump
30 GPM, 1-1/2HP
230V 1Ø 60Hz, 200/230/460V 3Ø 60Hz
Legend
System Curve:
Pump Curve:
Pump Optimal Range:
Operating Point:
Design Point:
6/4/2021 qPublic.net - Garfield County, CO - Property Record Card: R011101
https://qpublic.schneidercorp.com/Application.aspx?AppID=1038&LayerID=22381&PageTypeID=4&PageID=9447&KeyValue=R011101 1/2
Gar eld County, CO
View Map
FISHER, THOMAS DAVID & HAUSE, COLLEEN JA
1090 FENDER LANE
CARBONDALE CO 81623
Assessed Year 2021 2020 2019
Land Actual $180,000.00 $170,000.00 $170,000.00
Improvement Actual $0.00 $0.00 $0.00
Total Actual $180,000.00 $170,000.00 $170,000.00
Assessed Year 2021 2020 2019
Land Assessed $52,200.00 $49,300.00 $49,300.00
Improvement Assessed $0.00 $0.00 $0.00
Total Assessed $52,200.00 $49,300.00 $49,300.00
Tax Year 2020 2019 2018 2017
Taxes Billed $3,724.04 $3,757.12 $3,728.40 $884.84
Click here to view the tax information for this parcel on the Gar eld County Treasurer's website.
Sale Date Deed Type
Reception
Number
Book -
Page
Sale
Price Grantor Grantee
11/2/2020 WARRANTY DEED 944758 $210,000 ARMSTRONG, JAMES P FISHER, THOMAS DAVID; HAUSE,
COLLEEN JANICE
4/16/2018 WARRANTY DEED 906969 $170,000 B.KIDERLEN, MONIKA ARMSTRONG, JAMES P
4/16/2018 POWER OF ATTORNEY 906968 $0 KIDERLEN, MONIKA B SCHAEFER, BRIAN N-AIF
8/14/2017 SUPPLEMENTAL
AFFIDAVIT
896134 $0 HORST, KIDERLEN M-DEC KIDERLEN, HORST M-DEC
11/17/2016 RESOLUTION 888139 $0
10/25/2016 PERSONAL REP DEED 884557 $0 KIDERLEN, HORST MANFRED-AKA; KIDERLEN,
HORST M-AKA;...
KIDERLEN, MONIKA B
11/25/2015 LETTERS 871705 $0 KIDERLEN, HORST MANFRED - DEC KIDERLEN, MONIKA -PER REP
4/21/2015 DEATH CERTIFICATE 862362 $0 RAVENSBURG-GERMANY KIDERLEN, HORST MANFRED
5/14/2013 WARRANTY DEED 835283 $140,000 BROWN, EDWARD C; BROWN, JUDY H KIDERLEN, HORST M
12/30/1997 WARRANTY DEED 518632 1048-
0691
$130,000
Summary
Account R011101
Parcel 239116201016
Property
Address
, CARBONDALE, CO 81623
Legal
Description
Section: 16 Township: 7 Range: 87 Subdivision: PANORAMA RANCHES
1ST AMENDED HOMESTEAD 16, 2ND AMD FINAL PLAT OF
HOMESTEADS 16 & 17 REC# 773495; 5.028 ACRES
Acres 5.027
Land SqFt 0
Tax Area 11
Mill Levy 75.5380
Subdivision PANORAMA RANCHES 1ST AMENDED
Owner
Land
Unit Type 5 AC TO L/T 10 AC - 0530 (VACANT LAND)
Square Feet 0
Actual Values
Assessed Values
Tax History
Transfers
6/4/2021 qPublic.net - Garfield County, CO - Property Record Card: R011101
https://qpublic.schneidercorp.com/Application.aspx?AppID=1038&LayerID=22381&PageTypeID=4&PageID=9447&KeyValue=R011101 2/2
5/2/1994 GENERAL WARRANTY
DEED
462984 0901-
0987
$83,000
12/10/1993 WARRANTY DEED 456388 0885-
0475
$110,000
11/29/1993 AFFIDAVIT 456387 0885-
0474
$0
11/18/1993 QUIT CLAIM DEED 456386 0885-
0473
$0
10/10/1979 SUBDIVISION
IMPROVEMENTS
298381 0536-
0878
$0
10/9/1979 COVENANTS 298349 0536-
0799
$0
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The Gar eld County Assessor's Of ce makes every effort to produce the most accurate information possible. No warranties, expressed or
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Last Data Upload: 6/4/2021, 1:26:40 AM
Developed by
Garfield County, CO
Developed by
Account
Number
R011101
Par cel
Number
239116201016
Acr es 5
Land SqFt 0
T ax Ar ea 011
2019 Mill
Levy
75.5380
Physical
A ddr ess
0
C ARBONDALE 81623
O w ner
A ddr ess
FISHER, THOMAS DAVID & HAUSE,
C OLL EEN JA
1090 FENDER LANE
C ARBONDALE C O 81623
2019 T otal Actual
V alue
$180,000 Last 2 Sa les
Date Pr ice
11/2/2020 $210,000
4/16/2018 $0
Date created: 6/4/2021
Last Data Uploa ded: 6/4/2021 3:26:40 AM
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