HomeMy WebLinkAboutSubsurface Investigation & OWTS Design 01.14.15'' 33 Four Wheel Drive Rd
Cqrbondole, C0 8lé23
970-309-5259
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January 14,2015
Project No. C1101
Caleb Edelman
edelmancm(Ovahoo.com
Subsurface lnvestigation and Onsite Wastewater Treatment System Design
Proposed Garage with Plumbing
TBD Hwy 82
Garfield County, Colorado
Caleb,
ALL SERVICE septic, LLC performed a subsurface investigation and completed an onsite wastewater
treatment system (OWTS) design for a future garage with plumbing on the western portion of the subject
5.63-acre property (Site) with the following legal description:
A Parcel of land situated in Lot 1, Section 29, Township 7 South, Range 88 West of the Sixth Principal
Meridian, County of Garfield, State of Colorado.
ln addition to the garage, the owner desires to have the ability to construct a 4-bedroom residence in the
future without further modifications to the OWTS, The Site is located outside of Carbondale, in an area
where OWTSs and wells are necessary.
SITE CONDITIONS
The northern portion of the Site is currently developed with a single-family residence. A recently installed
OWTS serves the single-family residence. A driveway also exists on the northern portion of the Site for
access to the single-family residence. A garage with plumbing is proposed on the western portion of the
Site. A private well also exists on the Site. The well is located greater than 1O0-feet from the proposed
OWTS that will serve the proposed garage with plumbing.
The proposed soil treatment area (STA) location has approximately a twenty percent slope across the
proposed STA. Native vegetation such as sage and scrub oak exists in the area of the proposed STA.
SUBSURFACE
The subsurface was investigated on August 12,2014 by digging two 8-foot soil profile test pit excavations
(Test Pits) and conducting a visual and tactile evaluation of the soils at approximately 3-feet below native
grade.
The materials encountered in the Test Pit #1 consisted of medium to dark brown, moist, topsoil to 6-inches,
underlain by brownish red sandy loam with single grain structure shape, weak structure grade, and loose
consistence with flat, platy cobbles 2 to 4-inches in diameter to a maximum depth explored of 7.S-feet.
No bedrock or groundwater was encountered.
The materials encountered in the Test Pit #2 consisted of medium to dark brown, moist, topsoil to 6-inches,
underlain by brownish red sandy loam with single grain structure shape, weak structure grade, and loose
consistence with flat, platy cobbles 2 to 4-inches in diameter to a maximum depth explored of 7.O-feet.
No bedrock or groundwater was encountered.
Page2
Soils are classified as So¡l Type 1. A long term aooeptanoe rate (LTAR) of 0.8 gallons per square
foot will be used to design the OWTS, in accordance with Table l0-l presented in the Garfield
County On-Site Wastewater Treatment System Regulations, adopted April 14, 2014.
Test Pits observed August 12,2014
Test Pit #1
Test Pit#2
DESIGN SPECIFICAT¡ONS
The proposed garage will ínclude a shower, toilet, and lavatory for use by one person. Wastewater flow,
in accordance with Table 6-2 presented in the Garfield County On-Site Wastewater Treatment System
Regulations, adopted April 14, 2014, is calculated at47 .9 gallons per day.
Since a future,4-bedroom residence is contemplated, the OWTS design will be based on 4-bedrooms.
Desion Calculations:
Average Design Flow = 75x2 x 3 Bedrooms + 75 PGD = 525 GPD = Q
Q / LTAR = 525 gallons/day / 0.8 gallons/SF = 656 SF
656 GPD x 1.2 (gravity, bed) x 0.7 (chambêrs) = 551 SF
Page 3
The system installation will include a new 125O-gallon, two-compartment concrete septic tank an effluent
filter on the outlet tee. Effluent will gravity flow to a distribution box which must be made accessible from
grade. The STA will consist of three rows of 11 'Quick 4' lnfiltrator@ chambers and one row of 13 'Quick
4' lnfiltrator@ chambers for a total of 46 'Quick 4' lnfiltrator@ chambers and 552 square feet of infiltrative
area. lnspection ports must be placed at the beginning and end of each row of chambers.
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.
REVEGETATION REQUIREMENTS
An adequate layer of good quality topsoil capable of supporting revegetation shall be placed over the entire
disturbed are 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 irritation shall be plated 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 ownêr 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 absorption area. No heavy equipment, machinery, or
materials should be placed on backfilled STAs. 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.
The homeowner should pump the septic tank every two years, or as needed gauged by measurement of
solíds 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, air release valves and 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 controlsystem 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.
Page 4
INSTALLATION OBSERVATIONS
ALL SERVICE septic, LLC mu*t v¡iw th¡ OVVTS ùring aonstruation. 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. ALL SERVICE septic,
LLC should be notified 48 hours in advance to observe the installation.
LIMITS:
The design is based on information submitted. lf soil conditions encountered are different from conditions
described ín report, ALL SERVICE septic, LLC 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,
ALL SERVICE septic, LLC Reviewed By:
(a'q {* ("f itótr 6 .N\
Richard H.
Carla Ostberg, MPH, REHS
Liability Cfause: Under no circumstances whatsoever shattthe tiability of ALL SERVTCE septic, LLC, in connection with
any contract, directly or indirectly, exceed the total amount paid by the clientto ALL SERyTCE septic, LLC forthe services
and/or goods which are the subject of the contract in connection with which the tiabitity anses.
88668
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