HomeMy WebLinkAboutOWTS Design Packet 01.08.202033 FOUR WHEEL DRIVE ROAD
CARBONDALE, CO 81 623
970.309.5259
CARLA.OSTBERG@GMAIL. COM
��-:�•r�c c �r ,'-4k 1 rI'ct
January 8, 2020
Whit Whitaker
wrw3@_hotmail.com
Subsurface Investigation and Onsite Wastewater Treatment System Design
TBD Fisher Creek Lane
Lot 8, Ranch at Coulter Creek
Garfield County, Colorado
Whit,
Project No. C1485
CBO Inc. performed a subsurface investigation and completed an onsite wastewater treatment system
(OWTS) design for the subject residence. The 4.396-acre property is located outside of Carbondale, in
an area where OWTSs are necessary.
Legal Description:
Section: 1 Township: 7 Range: 88 Subdivision: RANCH AT COULTER CREEK PUD Lot: 8 AS PER
FIRST AMENDED FINAL PLAT RECEPTION NUMBER 889891
Parcel ID: 2393-014-01-008
SITE CONDITIONS
The property is currently undeveloped. A 4-bedroom, single-family residence is proposed.
The residence will be served potable water from a community water system. The water line will enter the
property from the west and will be installed along the driveway. No OWTS component will come within
25-feet of the water line.
The proposed soil treatment area (STA) location has an approximate 10 percent slope to the east. The
proposed area is in an open field covered 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.
briotak
Page 2
SUBSURFACE
The subsurface was investigated on November 11, 2019 by digging three soil profile test pit excavation (Test
Pit). A visual and tactile soil analysis was completed by Carla Ostberg at the time of excavation.'
The materials encountered in Test Pit #1 (approx. ground elevation 7415') consisted of dark brown silty clay
loam to a maximum depth explored of 7.0-feet. No bedrock or groundwater was encountered.
The materials encountered in Test Pit #2 (approx. ground elevation 7417') consisted of dark brown silty
clay loam to 4-feet, underlain by light brown a calcareous clay matrix to a maximum depth explored of
8.0-feet. No bedrock or groundwater was encountered.
The materials encountered in Test Pit #3 (approx. ground elevation 7427') consisted of dark brown silty
clay loam to 3.5-feet, underlain by light brown a calcareous clay matrix to a maximum depth explored of
5.0-feet. No bedrock or groundwater was encountered.
A tactile analysis of the soils was taken from Test Pit #1 at 3-feet below grade. Soil structure grade was
moderate. The soil formed a ball and a ribbon 1 to 2-inches in length before breaking. Soil structure
shape was blocky and consistence was firm. Soil texture was more smooth than gritty.
A tactile analysis of the soils was taken from Test Pit #2 below 4-feet. Soil structure grade was
moderate. The soil formed a ball and a weak ribbon less than 1-inch in length before breaking. Soil
structure shape was single grain to blocky and consistence was loose to friable. Soil texture was more
gritty than smooth.
A "Soil and Foundation Investigation" by LKP Engineering Inc. dated November 15, 2019 (enclosed)
reports a gradation of the material described here as the "calcareous clay matrix" as 30.6% gravel, 58.8%
sand, and 10.6% fines as Figure 5. This soil gradation is consistent with Soil Type 2.
The calcareous clay matrix is consistent with Soil Type 2. We are proposing the STA be placed in an
area of the property where this horizon can be found less than 4-feet below grade. A conservative long-
term acceptance rate (LTAR) of 0.5 gallons per square foot will be used to design the STA.
DESIGN SPECIFICATIONS
Design Calculations:
Average Design Flow = 75 GPD x 2 people/bedroom x 3 Bedrooms + 75 GPD (4th bedroom) = 525 GPD
LTAR = 0.5 GPD/SF
525 GPD / 0.5 GPD/SF x 0.8 (pressure dosed trenches) x 0.7 (chambers) = 588 SF
The new 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 as the sewer line exiting the residence has
been established as 100' (approx. 7422'). 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
98' (approx. 7420')
Automatic Distributing Valve
109' (approx. 7431')
Infiltrative Surface
108' (approx. 7430')
' Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile
Evaluation of Soils Training.
Page 3
The sewer line exiting the residence must have a double -sweep clean out and a minimum 2% grade to
the septic tank.
The installation must include a 1500-gallon, two -compartment Valley Precast concrete septic tank with an
Orenco® Biotube Pump Vault and an Orenco® PF3005 pump in the second compartment of the septic
tank. The floats must be set to dose approximately 50 gallons each pump cycle, allowing for
approximately 16 gallons of drain back into the pump chamber after each pump cycle. The pump
must be sized to handle 13.6 gallons per minute (GPM) and total dynamic head (TDH) of 25.8 feet.
Risers must be installed on the septic tank to bring access to grade. Handle extensions on both the
effluent filter and float tree must be installed if the riser height exceeds 1-foot. The control panel must be
located within line of sight of the septic tank. We recommend Valley Precast out of Buena Vista perform
start up on the pumping system.
A 1.5-inch diameter Schedule 40 pump line must be installed from the pump to an Orenco® automatic
distributing valve (ADV), model 6605. 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 in the system and be placed in
an insulated riser with access from grade. Screened rock must be placed below the ADV to support the
ADV and to assure the clear pipes existing the ADV remain visible for future inspection and maintenance.
Effluent will be pressure dosed through 1.5-inch diameter pipes to five trenches, each with 10 `Quick 4'
Infiltrator® chambers, for a total of 50 chambers and 600 square feet of infiltrative area. There must be
at least 4-feet of undisturbed soil between each trench, although we recommend at least 6-feet. Effluent
will be pressure dosed to 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 2-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 the beginning and end of each trench. 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
Valley Precast
Item # 1500T-2CP-HH
2-compartment concrete
septic tank with high -
head pump
Pump
Orenco®
PF300511 '/2 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®
V6605A
1.5" Inlet and Outlets
ADV Riser and Lid
Orenco®
Double -walled PVC Risers
and Lids (30" diameter)
Orifice Shields
Orenco®
1.5 inch diameter (10 total)
Page 4
Flushing Assembly
Orenco®
1.5" diameter
(2) 45° or 90° long sweep only
(5 total)
Chambers
Infiltrator®
50 `Quick 4' Standard Plus
The component manufacturers are typical of applications used by contractors and engineers in this area.
Alternatives may be considered or recommended by contacting our office. 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 5
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.
6aft_ Co_ Ov-ibft_g
Reviewed By:
Carla Ostberg, MPH, REHS Romeo A. Baylosis, PE
Pump Selection for a Pressurized System - Single Family Residence Project
Lot 8 Ranch at Coulter Creek
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
Calculations
1.25 inches
150 feet
40
1.50 inches
6605
40 feet
40
1.50 inches
12 feet
0 feet
40
1.50 inches
5
38 feet
40
1.50 inches
5/32 inches
2 feet
5 feet
None inches
0 feet
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
Frictional Head Losses
0.68 gpm
20
13.6 gpm
1
1.6
2.1 fps
2.1 fps
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
Pipe Volumes
1.3 feet
1.8 feet
4.9 feet
0.5 feet
0.0 feet
0.2 feet
0.0 feet
0.0 feet
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
Minimum Pump Requirements
15.9 gals
4.2 gals
0.0 gals
4.0 gals
15.9 gals
8.2 gals
Design Flow Rate
Total Dynamic Head
4191i
orenco
6 f 9 T r
13.6 gpm
25.8 feet
300
250
200
O
I 150
0
F
100
50
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PumpData
5
10 15 20 25
Net Discharge (gpm)
PF3005 High Head Effluent Pump
30 GPM, 1/2HP
115/230V 10 60Hz, 200V 30 60Hz
PF3007 High Head Effluent Pump
30 GPM, 3/4HP
230V 10 60Hz, 200/460V 30 60Hz
PF3010 High Head Effluent Pump
30 GPM, 1 HP
230V 10 60Hz, 200/460V 30 60Hz
PF3015 High Head Effluent Pump
30 GPM, 1-1/2HP
230V 10 60Hz, 200/230/460V 30 60Hz
Legend
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fqPubIic.net' Garfield County, CO
Account R041266
Number
Parcel
Number
Acres 4
Land SgFt 0
Tax Area 011
2019 Mill Levy 76.209
239301401008
Physical
Address
Owner
Address
Date created: 1/10/2020
Last Data Uploaded: 1/10/2020 4:34:39 AM
Developed byL� Schneider
w G€GSPATIAL
%,R041263
^'239301401005
SLC-LAURENCE R041267
LLC `239301401009
..;: R05026.5 . .. r....• .
23931120095.1 r. ,
0
CARBONDALE
PEISACH, HARRY & KATHRYN
FLECK
510 OREGON TRAIL
ASPEN CO 81611
R041268
1239105301010
SCHREIBER
5.. E_VAN
2019 Total Actual
Value
81623
Overview
Legend
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
$45,580 Last 2 Sales
Date Price
10/16/2019 $290,000
4/26/2018 $0
TRACT B
ELECTRIC
II 16" CMP
EL=7446.05'
I
I
I
MATCHLINE 2
EDGE DIRT
I ROAD
IO 16" CMP
EL=7445.58'
PROPERTY DESCRIPTION
LOT 7
TRACT B
I
ELECTRIC
/ MANHOLE
/ y EECT
\ / TRLANSFORIC
RMER
/'4//
I
/
/
TRACT B
MATCHLINE 2
#5 REBAR & RED PLASTIC
CAP L.S. #28643 (TYP.)
25' PRIVATE ACCESS &
UTILITY EASEMENT PER
REC. NO. 653768
\ EDGE DIRT
GOAD
\ Fx UE
\ r
TELEPHONE
ELECTRIC
LOT 8, THE RANCH AT COULTER CREEK, P.U.D., ACCORDING TO THE FINAL PLAT RECORDED
JUNE 9, 2004 AS RECEPTION NO. 653768, COUNTY OF GARFIELD, STATE OF COLORADO.
NOTES:
1) THIS PROPERTY IS SUBJECT TO RESERVATIONS, RESTRICTIONS, COVENANTS, BUILDING
SETBACKS AND EASEMENTS OF RECORD, OR IN PLACE. THIS SURVEY WAS PREPARED WITHOUT
THE BENEFIT OF A TITLE COMMITMENT THEREFORE, EXCEPTIONS TO TITLE THAT MAY AFFECT
THE SUBJECT PROPERTY HAVE NOT BEEN RESEARCHED BY PEAK SURVEYING, INC.
2) THE DATE OF THIS SURVEY WAS AUGUST 01, 2019.
3) BASIS OF BEARINGS FOR THIS SURVEY IS A BEARING OF S89°21'15"E BETWEEN THE
SOUTHWESTERLY CORNER OF LOT 8, A #5 REBAR & CAP L.S. #28643 FOUND IN PLACE AND THE
SOUTHEASTERLY CORNER OF LOT 8, A #5 REBAR & CAP L.S. #28643 FOUND IN PLACE.
4) UNITS OF MEASURE FOR ALL DIMENSIONS SHOWN HEREON IS U.S. SURVEY FEET.
5) THIS SURVEY IS BASED ON THE RANCH AT COULTER CREEK, P.U.D., FINAL PLAT RECORDED
JUNE 9, 2004 AS RECEPTION NO. 653768 IN THE GARFIELD COUNTY CLERK AND RECORDER'S
OFFICE AND CORNERS FOUND IN PLACE.
6) ELEVATIONS ARE BASED ON A GPS OBSERVATION (1988 ORTHO DATUM) YIELDING AN
ON -SITE ELEVATION OF 7437.10' ON NORTHWESTERLY BUILDING ENVELOPE CORNER AS SHOWN.
CONTOUR INTERVAL EQUALS 1 FOOT.
7) ACCORDING TO BOOK 1559 PAGE 421, BOOK 1595 PAGES 137, 138, 139 AND PLAT RECEPTION NO.
653768, ACCESS AND UTILITY EASEMENTS EXIST WITHIN THE PLATTED RIGHT-OF-WAYS.
NOTICE: ACCORDING TO COLORADO LAW, YOU MUST COMMENCE ANY LEGAL ACTION
BASED UPON ANY DEFECT IN THIS SURVEY WITHIN THREE YEARS AFTER YOU FIRST
DISCOVER SUCH DEFECT. IN NO EVENT MAY ANY ACTION BASED UPON ANY DEFECT IN
THIS SURVEY BE COMMENCED MORE THAN TEN YEARS FROM THE DATE OF THE
CERTIFICATION SHOWN HEREON.
TRACT B
WATER VALVE
FIRE
HYDRANT
TRACT B
ELECTRIC
TRANSFORMER
TELEP
PEDESTAL
25
REBAR & RED PL TIC
AP L.S. #28643 (T ` '.)
TBM EL=7437.1
LATH SET
LOT 7
TELEPHONE
TRACT B
/ yz \
/ 7/
/ e\ EDGE DIRT /
ELECTRIC / ROAD
A/
LOT 7
10 16" CMP
EL=7448.93'
II 16" CMP
EL=7449.37'
FISHER CREEK
LANE
ASPHALT
TRACT B
,j70j5'12" E
TRACT B
23.
465.00
740.
LOT 8
191,500 S.F.±
4.396 AC.±
G E LOP PER P AT REC NO. 653 ' 68
N 89°2 '15"
N 89°21115" W
BLM
P.O. Box 1746
Rifle, CO 81650
Phone (970) 625-1954
Fax (970) 579-7150
www.peaksurveyinginc.com
Drawn By:
JRN
Checked By:
JRN
Date:
AUGUST 11, 2019
Computer File:
048.DWG
NO.
Date
IMPROVEMENT SURVEY PLAT &
PARTIAL TOPOGRAPHIC SURVEY
LOT 8, THE RANCH AT COULTER CREEK, P.U.D.
ACCORDING TO THE FINAL PLAT RECORDED
JUNE 9, 2004 AS RECEPTION NO. 653768
COUNTY OF GARFIELD, STATE OF COLORADO
LOT 9
Revision
30
N
0
330
30
300 -' 60
W 270 A-' 90 E
240 120
0 15
210
180
150
S
GRAPHIC SCALE
60
120
( IN FEET )
1 inch = 30 ft.
IMPROVEMENT SURVEY STATEMENT
I HEREBY STATE THAT THIS IMPROVEMENT SURVEY WAS PREPARED BY PEAK SURVEYING, INC.
FOR SLC-LAURENCE, LLC.
I FURTHER STATE THAT THE IMPROVEMENTS ON THE ABOVE DESCRIBED PARCEL ON THIS DATE,
AUGUST 01, 2019, EXCEPT UTILITY CONNECTIONS, ARE ENTIRELY WITHIN THE BOUNDARIES OF
THE PARCEL, EXCEPT AS SHOWN, THAT THERE ARE NO ENCROACHMENTS UPON THE DESCRIBED
PREMISES BY IMPROVEMENTS ON ANY ADJOINING PREMISES, EXCEPT AS INDICATED, AND THAT
THERE IS NO APPARENT EVIDENCE OR SIGN OF ANY EASEMENT CROSSING OR BURDENING ANY
PART OF SAID PARCEL, EXCEPT AS NOTED. I FURTHER STATE THIS SURVEY WAS PREPARED
WITHOUT THE BENEFIT OF A TITLE COMMITMENT, THEREFORE, ANY EXCEPTIONS THAT MAY
AFFECT THE SUBJECT PROPERTY HAVE NOT BEEN RESEARCHED BY PEAK SURVEYING, INC.
BY:
By
' 77ID
ff5 REBAR & RED PLASTIC
CAP L.S. #28643 (TYP.)
#5 REBAR & RED PLASTIC
CAP L.S. #28643 (TYP.)
SLC-LAURENCE, LLC.
GARFIELD COUNTY, COLORADO
IMPROVEMENT & TOPO SURVEY
LOT 8, THE RANCH AT COULTER CK.
LOT 10
S 00°38'45" W
Project NO.
19048
1 OF 1