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Home My WebLink AboutOWTS Design Report 12.06.2014 December 6, 2014 Project No. C1113 Marissa Hickmon 46145 Hwy 6 Glenwood Springs, CO 81601 mchickmon@gmail.com Subsurface Investigation and Onsite Wastewater Treatment System Design 4-Bedroom Residence 46145 Hwy 6 Garfield County, Colorado Marissa, ALL SERVICE septic, LLC performed a subsurface investigation and completed an onsite wastewater treatment system (OWTS) design for the subject residence. The property is located in Canyon Creek, outside of Glenwood Springs, in an area where OWTSs are necessary. The legal description of the property is as follows: Section: 36 Township: 5 Range: 90 Subdivision: RIVERVIEW SUB. Block: 2 Lot: 3 SITE CONDITIONS A 4-bedroom, single-family residence presently exists and is utilizing an existing OWTS that is experiencing problems. The OWTS consists of an approximate 1000 to 1250-gallon, single-compartment septic tank, followed by a distribution box and pipe and gravel soil treatment area (STA). The STA has failed and there is a desire to replace the STA. The residence is served domestic water by a public water system. SUBSURFACE The subsurface was investigated on December 5, 2014 by digging one 8-foot soil profile test pit excavation, one 6-foot soil profile test pit excavation (Test Pits), and performing a visual and tactile evaluation of the soils at approximately 3 to 4-feet below grade in both Test Pits. The materials encountered in the Test Pit #1 consisted of dark brown, moist, topsoil to 6-inches, underlain by medium brown, moist, loam with granular structure shape, moderate structure grade, and friable consistence to a maximum depth explored of 8.0-feet. A 6-inch gravelly horizon with 1 to 3-inch diameter cobbles is present at approximately 3-feet below grade. No bedrock or groundwater was encountered. This Test Pit was located on the eastern portion of the property, south of the driveway. The materials encountered in Test Pit #2 consisted of dark brown, moist, topsoil to 6-inches, underlain by medium brown, moist, loam with granular structure shape, moderate structure grade, and friable consistence to a maximum depth explored of 6.0-feet. A 6-inch gravelly horizon with 1 to 3-inch diameter cobbles is present at approximately 4-feet below grade. Rock content increased as depth increased, but did not exceed 50%. No bedrock or groundwater was encountered. This Test Pit was located east of the existing septic tank. Page 2 The Soil is classified as Soil Type 2. A long term acceptance rate (LTAR) of 0.6 gallons per square foot, will be used to design the OWTS, in accordance with Table 10-1 Soil Type 2 presented in the Garfield County On-Site Wastewater Treatment System Regulations, adopted April 14, 2014. Test Pits observed December 5, 2014 Test Pit #1 Backfill Test Pit Test Pit #2 Backfill Sieved soils sidewall of Test PIt Soils examined in this pit, near existing distribution box Page 3 EXISTING OWTS COMPONENTS DESIGN SPECIFICATIONS The new OWTS design is based on 4-bedrooms. A wastewater flow of 525 GPD will be used. The system installation will include the existing single-compartment septic tank followed by a new 500-gallon concrete chamber with an effluent filter on the outlet tee The existing distribution box will be removed and the existing STA will be abandoned in place. A new distribution box will be installed and will distribute effluent to three gravelless chamber beds. The STA will consist three gravelless chamber beds, two beds with two rows of seven ‘ARC 36’ chambers and one bed with three rows of seven ‘ARC 36’ chambers for a total of 49 chambers. Each of the beds will be connected with a level manifold. There must be an inspection port at the beginning and end of each bed. Cover over chambers may not exceed 3-feet. A minimum setback of 20-feet from the house to the STA must be maintained. There must also be a minimum setback of 10-feet from the STA to any property line. 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. D-box Septic tank Septic tank D-box Inlet tee Outlet tee Page 4 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 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 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 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, air release valves and weep holes must be installed to allow pump lines to drain to minimize risk of freezing. The pump shall be connected to a control breaker separate from the high water alarm breaker and from any other control system circuits. 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. INSTALLATION OBSERVATIONS ALL SERVICE septic, LLC 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. ALL SERVICE septic, LLC should be notified 48 hours in advance to observe the installation. LIMITS: The design is based on information submitted. If soil conditions encountered are different from conditions described in 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. Page 5 Please call with questions. Sincerely, ALL SERVICE septic, LLC Reviewed By: Carla Ostberg, MPH, REHS Liability Clause: Under no circumstances whatsoever shall the liability of ALL SERVICE septic, LLC, in connection with any contract, directly or indirectly, exceed the total amount paid by the client to ALL SERVICE septic, LLC for the services and/or goods which are the subject of the contract in connection with which the liability arises. Issue Date: 12/4/2014 Expires: 12/04/2015 Permit NO. SEPT-12-14-3472 46145 Hwy 6 & 24 GLENWOOD SPRINGS, CO Permit Type: Septic Permit 212336202003 Project Address Permit Status: Active Owner Information Address Phone Cell 46145 Hwy 6 & 24 Glenwood Springs CO 46145 Hwy 6 & 24 Glenwood Springs CO (970)379-1155 Permit Work Classification: Repair Phone: (970)945-8212 Fax: (970)384-3470 Glenwood Springs, CO 81601- 108 8th Street Suite 401 Garfield County Community Development Department RIVERVIEW SUB. Parcel No.Subdivision Section Township Range Marissa Hickmon Building Department Copy $0.00 0Total Sq Feet: Valuation: Proposed Construction / Details IVRInspection For Inspections call : Required Inspections: See Permit Record Contractor(s)Phone Primary Contractor Yes(970)984-3308Miles Rippy Excavation 1(970)945-1377 ext 1621 Fee Amount $0.00 Percolation Test $75.00 Septic Fee - Alteration or Repair Total: $75.00 Inv Total Amt Paid Amt DuePaytype Inv # SEPT-12-14-23305 $75.00 Credit Card $75.00 $0.00 Inv # SEPT-12-14-23306 $0.00 $0.00 FEES PAIDFEES DUE repair to current septic system Thursday, December 4, 2014 2