HomeMy WebLinkAboutEngineers' Design Plan- Revised 02-07-24129 Cains Lane
Carbondale, CO 81623
970.309.5259
carla.ostberg@gmail.com
February 7, 2024 Project No. C1863
Guy Middleton
gmpumper@icloud.com
Subsurface Investigation and Onsite Wastewater Treatment System Design
3-Bedroom Residence
1916 CR 311
Garfield County, Colorado
Guy,
CBO Inc. performed a subsurface investigation and completed an onsite wastewater treatment system
(OWTS) design for the subject residence. The 0.879-acre property is located outside of Silt, in an area
where OWTSs and wells are necessary.
Legal Description: Quarter: SW Section: 12 Township: 6 Range: 92 TRACT OF LAND SITUATED IN LOT
8
Parcel ID: 2179-123-00-737
SITE CONDITIONS The property is currently developed with a residence on the western portion of the property which is
served by a separate OWTS. The eastern portion of the property was developed with a mobile home,
served by an OWTS. The mobile home has been removed and the OWTS will be properly abandoned.
A new 3-bedroom residence is proposed on the eastern portion of the property and will be served by the
proposed OWTS described in these design documents.
The residence will be served by a private well on the property. The well is located in the southeastern
corner of the property. The well is located greater than 50-feet from the proposed septic tank and greater
than 100-feet from the proposed soil treatment area (STA).
The proposed soil treatment area (STA) location is relatively flat. The proposed area is vegetated with
native grasses.
The existing septic tank and STA previously serving the mobile home may be located in the proposed
STA. If removal of existing OWTS components is necessary, remaining voids must be backfilled by
native soils, tamped in 1-foot lifts. Efforts should be made to avoid placing the proposed STA over any
over-excavated areas.
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.
Page 2
Well approx. location of existing septic tank to be abandoned
SUBSURFACE
The subsurface was investigated on September 15, 2023 by digging two soil profile test pit excavations (Test
Pits). A visual and tactile soil analysis was completed by Carla Ostberg at the time of excavation.1
The materials encountered in Test Pit #1 consisted of medium brown topsoil to 1-foot, underlain by light
brown silt clay loam to 5-feet, underlain by light brown silt clay loam with increasing cobbles to a
maximum depth explored of 6.5-feet. No bedrock or groundwater was encountered.
The materials encountered in Test Pit #2 consisted of medium brown topsoil to 1-foot, underlain by light
brown, dense silt clay loam to 4.5-feet, underlain by light brown silt clay loam with increasing cobbles to a
maximum depth explored of 6.5-feet. No bedrock or groundwater was encountered.
A sample of the soil was taken from Test Pit #1 at 3-feet below grade. Soil structure grade was
moderate. The soil formed a ball and a ribbon between 1 and 2-inches in length before breaking. Soil
structure shape was blocky and consistence was firm. Soil texture was smooth.
We have researched soils in the area through USGS Web Soil Survey. The report is enclosed. The area of
the proposed STA is identified by map unit symbol 65. The map unit name is Torrifluvents, nearly level.
Typical soil profile consists of 0 to 36 inches loam, 36 to 60 inches consist of sand.
The soil is consistent with Soil Type 3, Clay Loam, with moderate structure grade. A long-term
acceptance rate (LTAR) of 0.35 gallons per square foot will be used to design the STA. We are
proposing a shallow installation of the STA, at approximately 2-feet below native grade.
1 Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile
Evaluation of Soils Training.
Page 3
Test Pit #1 Backfill
Test Pit #1, cobbles encountered starting at 6.5-feet / Sidewall
Page 4
Length of ribbon between 1 and 2-inches
View of Test Pit #1
Test Pit #2 Backfill
Page 5
Test Pit #2 (slightly more dense sidewall)
DESIGN SPECIFICATIONS
The existing septic tank will be abandoned by pumping the tank and removing it. The void must be filled
with onsite material, tamped in 1-foot lifts. The existing STA will be abandoned in place.
Design Calculations:
Average Design Flow = 75 GPD x 2 people/bedroom x 3 Bedrooms = 450 GPD
LTAR = 0.35 GPD/SF
450 GPD / 0.35 GPD/SF = 1286 SF x 1.2 (gravity, bed) x 0.7 (chambers) = 1080 SF
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). 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 Approximate horizontal distance 5’ / min. 2% fall /
min. 1.25” fall
Distribution Box Approximate horizontal distance 22’ / min. 1% fall /
min. 2.75” fall
Infiltrative Surface Approximate horizontal distance 23’ to furthest bed
/ min. 1% fall to STA / min. 2.875” fall
*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
2% grade to the septic tank.
The system installation must include a 1000-gallon, two-compartment Infiltrator® poly septic tank with an
Orenco® Biotube effluent filter on the outlet tee. Any state-approved poly or concrete tank may be
Page 6
substituted. Risers must bring the manhole lids to grade for access. If 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 two gravelless chamber beds. 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 bed.
A 4-inch diameter SDR-35 level manifold must be installed to connect each row of the chamber beds.
The chamber beds will consist of 3 rows of 15 ‘Quick 4’ Infiltrator® chambers for a total of 90 chambers
and 1080 square feet of infiltrative area. There must be at least 6-feet of undisturbed soil between each
bed. There may be an exception where the existing septic tank was removed. We recommend the
infiltrative area be placed at approximately 2-feet below native grade for a shallow installation. Inspection
ports must be installed at each corner of the beds. 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.
COMPONENT MANUFACTURER MODEL NO. COMMENTS
Septic Tank Infiltrator® Item # IM1060-2CP Min. 1000-gallon, 2-
compartment septic tank
Effluent Filter Orenco® 4” diameter full size
effluent filter
Double-walled risers
and lid
Orenco® Risers and Lids
Distribution Box, risers, lid and flow equalizers
Polylok 2 ‘Roto-flow’
Chambers Infiltrator® ‘Quick 4’ Plus Standard Low Profile Chambers 90 low profile chambers
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.garfield-county.com/environmental-health/filesgcco/sites/16/OWTS-Application-Complete-
Packet-Dec.-2019.pdf. If 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 x8150.
Page 7
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.
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.
Page 8
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 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. 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.
Carla Ostberg, MPH, REHS
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Soil Map—Rifle Area, Colorado, Parts of Garfield and Mesa Counties
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
2/7/2024
Page 1 of 3
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274610 274620 274630 274640 274650 274660 274670 274680 274690
274610 274620 274630 274640 274650 274660 274670 274680
39° 32' 28'' N
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39° 32' 28'' N
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39° 32' 25'' N
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39° 32' 25'' N
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Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 25 50 100 150
Feet
0 5 10 20 30
Meters
Map Scale: 1:537 if printed on A portrait (8.5" x 11") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Map Unit Polygons
Soil Map Unit Lines
Soil Map Unit Points
Special Point Features
Blowout
Borrow Pit
Clay Spot
Closed Depression
Gravel Pit
Gravelly Spot
Landfill
Lava Flow
Marsh or swamp
Mine or Quarry
Miscellaneous Water
Perennial Water
Rock Outcrop
Saline Spot
Sandy Spot
Severely Eroded Spot
Sinkhole
Slide or Slip
Sodic Spot
Spoil Area
Stony Spot
Very Stony Spot
Wet Spot
Other
Special Line Features
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: 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: Rifle Area, Colorado, Parts of Garfield and
Mesa Counties
Survey Area Data: Version 16, Aug 22, 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, 2021
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Soil Map—Rifle Area, Colorado, Parts of Garfield and Mesa Counties
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
2/7/2024
Page 2 of 3
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
3 Arvada loam, 1 to 6 percent
slopes
0.5 37.4%
65 Torrifluvents, nearly level 0.8 62.6%
Totals for Area of Interest 1.2 100.0%
Soil Map—Rifle Area, Colorado, Parts of Garfield and Mesa Counties
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
2/7/2024
Page 3 of 3
Rifle Area, Colorado, Parts of Garfield and Mesa
Counties
65—Torrifluvents, nearly level
Map Unit Setting
National map unit symbol: jnz3
Elevation: 5,000 to 7,000 feet
Mean annual precipitation: 12 to 15 inches
Mean annual air temperature: 46 to 48 degrees F
Frost-free period: 90 to 120 days
Farmland classification: Not prime farmland
Map Unit Composition
Torrifluvents and similar soils:85 percent
Minor components:15 percent
Estimates are based on observations, descriptions, and transects of
the mapunit.
Description of Torrifluvents
Setting
Landform:Distributaries, rivers, flood plains
Down-slope shape:Linear, convex
Across-slope shape:Linear, convex
Parent material:Alluvium
Typical profile
H1 - 0 to 36 inches: loam
H2 - 36 to 60 inches: sand
Properties and qualities
Slope:0 to 6 percent
Depth to restrictive feature:More than 80 inches
Drainage class:Moderately well drained
Runoff class: Low
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:About 12 to 36 inches
Frequency of flooding:Occasional
Frequency of ponding:None
Calcium carbonate, maximum content:5 percent
Gypsum, maximum content:1 percent
Maximum salinity:Very slightly saline to moderately saline (2.0 to
8.0 mmhos/cm)
Sodium adsorption ratio, maximum:2.0
Available water supply, 0 to 60 inches: Moderate (about 7.6
inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 7w
Map Unit Description: Torrifluvents, nearly level---Rifle Area, Colorado, Parts of Garfield and
Mesa Counties
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
2/7/2024
Page 1 of 2
Hydrologic Soil Group: C
Hydric soil rating: No
Minor Components
Wann
Percent of map unit:10 percent
Landform:Terraces
Hydric soil rating: Yes
Fluvaquents
Percent of map unit:5 percent
Landform:Marshes
Hydric soil rating: Yes
Data Source Information
Soil Survey Area: Rifle Area, Colorado, Parts of Garfield and Mesa Counties
Survey Area Data: Version 16, Aug 22, 2023
Map Unit Description: Torrifluvents, nearly level---Rifle Area, Colorado, Parts of Garfield and
Mesa Counties
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
2/7/2024
Page 2 of 2
2,257
376.2
Map Viewer
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 primary data and
information sources to ascertain the usability of the information.
1,7541:
Feet2920
Legend
146
Notes
Location
292
Date Prepared: 2/7/2024 1:47:16 PM
Well Constructed
Final Permit
Ground Water
Geophysical Log
Confluence Point
Source Water Route Framework
County
Gar eld County, CO
Developed by
Account Number R083274
Parcel Number 217912300737
Acres 1
Land SqFt 0
Tax Area 023
2019 Mill Levy 65.5390
Physical Address 1914 311 COUNTY RD
SILT 81652
Owner Address MIDDLETON, GUY
1912 COUNTY ROAD 311
NEW CASTLE CO 81647
2019 Total Actual Value $310,610 Last 2 Sales
Date Price
n/a $
n/a $
Date created: 8/18/2023
Last Data Uploaded: 8/18/2023 2:06:54 AM
187 ft
Overview
Legend
Parcels
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