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HomeMy WebLinkAboutFinal System Design & Installation 08.13.2013August 13, 2013 PO Box 2844 Glenwood Springs, CO 81602 Ph 970.618.5033 Fax 303-216-2796 Brad Crawford Crawford Design Build Cra« forddesiunbuild dcomcast.net Subsurface Investigation and Onsite Wastewater Treatment System Design 4 -Bedroom Residence Lot 12, Callicotte Ranch Garfield County, Colorado Brad, Project No. C 1043 ALL SERVICE septic, LLC performed a subsurface investigation and an onsite wastewater treatment system (OWTS) design for the proposed residence located at Lot 12, Callicotte Ranch. The property is located outside of Carbondale, in an area where OWTSs are necessary. SITE CONDITIONS A 4 -bedroom, single-family residence is proposed an the subject property. The residence will be served by a community water system, with the water line entering the property from the east. A large driveway circle will be located to the north of the proposed residence and the absorption area will be Iocated inside of this circle. SUBSURFACE The subsurface was investigated by digging one 8 -foot profile pit and taking a soil sample from approximately 2.5 -feet below grade. A gradation analysis and hydrometer analysis was run by HP Geotech and results are detailed in a report dated July 31, 2013, Job No 113 064M. The materials encountered in the profile pit consisted of 6 -inches of topsoil, underlain by dark brown, loose, sandy loam to 2.5 -feet, underlain by tan, dense sandstone to a maximum depth explored of 8.0 - feet. The tan sandstone breaks apart easily. There were some Targe rocks 1 to 2 -feet in diameter near the bottom of the profile hole. No bedrock or groundwater was encountered. The gradation performed by HP Geotech shows the soil consists of 17% gravel, 41% sand, 44% silt, and 8°'o clay. A long term acceptance rate (LTAR) of 0.65 gal/sq. ft will be used to design the OWTS. Page 2 DESIGN SPECIFICATIONS The OWTS design is based on 4 -bedrooms. An average daily wastewater flow of 600 GPD will be used. The installation must include a two-compartment, 1250 -gallon septic tank with an effluent filter on the outlet. 4 -inch schedule 40 pipe should be used under the driveway, compacted well, with blueboard insulation over the line to prevent freezing. Effluent will gravity flow to a distribution box, baffled and accessible from grade. The absorption area will consist of four gravelless chamber trenches, each with 18 `Quick 4' Infiltrator® chambers in each trench. There must be 6 -feet of undisturbed soil between each trench. Tank and chamber alternatives may be considered and are subject to engineer approval. Construction must be according to Garfield County Individual Sewage Disposal System (ISDS) Regulations, the ISDS 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 area. 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 absorption systems, and any other components needing maintenance. Geo -fabrics or plastics should not be used over the drain field. No heavy equipment, machinery, or materials should be placed on backfilled drain field, Livestock should not graze on the drain field. PIumbing fixtures should be checked to ensure that no additional water is being discharged to OWTS. Page 3 For example, a running toilet or leaky faucet can discharge hundreds of gallons of water a day and harm a drain field. 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 should be installed to allow pump lines to drain to minimize risk of freezing. Excavation equipment must not drive in excavation of drain field due to the potential to compact soil. Extensions should be placed on all septic tank components to allow access to them from existing grade. Precast concrete tanks and distribution boxes should be used, unless plastic or fiberglass is required. Access to all tank compartments and distribution devices is optimal. 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 installer should have documented and demonstrated knowledge of the requirements and regulations of the county in which they are working. Please call with questions. Sincerely, ALL SERVICE septic, LLC Os -f -huts Carla Ostberg, MPH, RENS �P Gec>teeh H EPWORTH-PAWLAK July 31, 2013 CBO Inc. Attn: Carla Ostberg 33 Four Wheel Drive Road Carbondale, Colorado 81623 caria.ostberg cr,bmaiLcom 1Icpuurth-Pawlak GCUtech:lital, Inc. 5020 County Road 154 Glenwood Springs, Colorado 81601 Phone: 970-945-7955 Fax: 9711.945.8454 Frnail hpgco g-hpgcotcch.com Job No. 113 064M Subject: Laboratory Test Results, Lot 12, Callicotte, Garfield County, Colorado Dear Mrs. Ostberg: As requested, Hepworth-Pawlak Geotechnical, Inc. performed gradation and hydrometer analysis on a sample delivered to our laboratory by you. The services were performed in accordance with our agreement for professional engineering services to you, dated March 20, 2013. Results of the gradation and hydrometer analysis performed on the sample are presented on Figure 1. The USDA Soil Texture Classification is Loam. If you have any questions or need further assistance, please call our office. Sincerely, HEPWORTH — PAWLAK GEOTECHNICAL, INC. Louis E. 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