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HomeMy WebLinkAboutOWTS Investigation & Design Report 03.22.2010PO Box 2844 Glenwood Springs, CO 81602 Ph 970-618-5033 Fax 303-216.2796 March 22nd 2010 Project No. 1694 Curtis Ercanback 1015 Hickory Drive Rifle, CO 81650 Subsurface Investigation and Repair Onsite Wastewater System Design 4 -Bedroom Residence 585 Cindy's Way Garfield County, Colorado Curtis, ALL SERVICE septic, LLC performed a subsurface investigation and a repair onsite wastewater system (OWS) design for the subject residence. The property is located outside of Rifle, in an area where OWS and wells are necessary. SITE CONDITIONS A single-family residence presently exists and is utilizing an OWS which is experiencing problems. The septic tank is in good condition, although the drain field has failed. There are several sheds on the 10 acre property, and the proposed drain field area is relatively flat. Water is provided by a well which is located to the north of the residence. SUBSURFACE The subsurface was investigated by digging three percolation holes, as indicated. An eight foot test pit is required prior to construction of the drain field to confirm subsurface conditions. Percolation rates ranged from 40 to 20 minutes per inch (MPI). A 27 MPI rate will be used to design the OWS. DESIGN SPECIFICATIONS The OWS design is based on 4 -bedrooms and an average sewage load of 600 GPD. The installation must include the existing 1250 -gallon, two-compartment, precast concrete septic tank, to be followed by gravelless chamber trenches. Three gravelless chamber trenches, using `Quick -4' InfiltratorTM chambers, must be installed as indicated. Each trench must have 1 row of 16 chambers, for a total of 474 square feet (SF) of infiltrative area. A concrete distribution box with a baffle must be installed. Onsite Wastewater Systems Page 2 Construction must be according to the Garfield County Environmental Health Department OWS regulations, the OWS Construction Permit provided by the county, and this design. This design for the subject property, noted above, is valid only in conjunction with the approved Garfield County Environmental Health Department. OPERATION INFORMATION AND MAINTENANCE The surface of the drain field should be seeded upon completion. Vegetation is an important factor in drain field performance. Erosion control should be practiced prior to and during re -vegetation. 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. Plumbing fixtures should be checked to ensure that no additional water is being discharged to OWS. 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 and clean the effluent filter as needed. Garbage disposal use should be minimized, and non -biodegradable materials should not be placed into the OWS. Grease should not be placed in household drains. Loading from a water softener should not be discharged into the OWS. No hazardous wastes should be directed into the OWS. Mechanical room drains should not discharge into the OWS. The OWS 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, and the county must view the OWS during construction. The OWS observation should be performed before backfill, after placement of chambers and distribution pipes. 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. Onsite Wastewater Systems Page 3 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 OWS construction must be according to the county regulations. Requirements not specified in this report must follow 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 Timothy R. Petz �~ 3 copies Reviewed B..y Richard H. Piwtz, w T C j J m a a c o O a (ond Drive 4 BEDROOM OUSE Pond P-3 0 0 P-1 P-2 SHED CLEANOUT EXISTING 1250 GAL TWO -COMP. TANK ADD EFFLUENT FILTER IN 2ND COMP. SITE PLAN AND PROPOSED OWS i' N 0' 50' 100' Scale: 1" = 100'-0" C a o ❑. fl�� seP�� P.O. Box 2844 Glenwood Springs, Colorado 81602 Phone 970.618.5033 Fax 303.216.2796 Ercanbrack Residence 585 Cindy's Way Garfield, Colorado Project Number: 1694 W100 Sheet 1 of 4 i 0' 20' 40' Scale: 1" = 40'-0" Pond Pond ) a) 0 4 BEDROOM HOUSE 1• ii■i■■■■■■MMI ■■ME Pond 0 PROPOSED OWS SHED EXISTING CLEANOUT / EXISTING 1250 GAL. TWO-COMPARTMENT TANK. ADD EFFLUENT FILTER IN SECOND COMPARTMENT 4" SDR 35 PVC PIPE (1 % FALL TO D -BOX) DISTRIBUTION BOX — 3 GRAVELLESS CHAMBER TRENCHES. EACH TRENCH HAS 16 CHAMBERS FOR A TOTAL OF 48 CHAMBERS. TOTAL AREA = 474 SF OBSERVATION PIPES HIL P.O. Box 2844 Glenwood Springs, Colorado 81602 Phone 970.618.5033 Fax 303.216.2796 Ercanbrack Residence 585 Cindy's Way Garfield, Colorado Project Number: 1694 W2.0 Sheet 2 of 4 DESIGN 4 -BEDROOM RESIDENCE LOADING = q = 600 GALLONS PER DAY PERCOLATION RATE = t = 27 MINUTES PER INCH (MPI) CALCULATED AREA = ((1.5 X q X sqrt t) / 5) = 936 SF PROPOSED AREA = 936 SF X 50% REDUCTION = 468 SF TRENCH SPECIFICATIONS WIDTH OF TRENCHES = 3 FEET = 1 CHAMBERS LENGTH OF 'QUICK -4' TRENCHES = 64 FEET = 16 CHAMBERS TOTAL NUMBER OF 'QUICK -4' CHAMBERS = 48 TOTAL INFILTRATIVE AREA = 474 SF THREE TOTAL TRENCHES DRAIN FIELD CROSS SECTION - TYP. FINISHED GRADE -SLIP-ON PVC CAP DO NOT GLUE SEWER LINE -4" SCHEDULE 4' MIN 40 P.V.C. LATERAL SUSPENDED 4" PVC OBERVATION LIMIT OF WITH 'ZIP -TIE-- - PIPE / EXCAVATION 3.0' MAX INLET - 6' MIN GRAVELLESS CHAMBER (4' x 3') DISTRIBUTION BOX WITH BAFFLE 4" PVC PIPES SDR 35 2.5' MIN 1 EFFLUENT LINE - — 4" SCHEDULE 40 OR 4" SDR 35 P.V.C. SWEEP / 2 WAY CLEANOUT DETAILS (N.T.S) TYPICAL INFILTRATOR(R) QUICK4(TM) CUT SHEET 16 SCARIFY SURFACE PRIOR TO PLACEMENT OF SAND PLAN VIEW - TYP. GRAVELLESS CHAMBER 'QUICK -4' --.. 12" 52" 48" INSULATED COPPER TRACER WIRE MAY BE INSTALLED TO LOCATE LINE IN FUTURE OBSERVATION PIPE 34" PVC PIPE TO ENTER IN TOP PORT OF END PLATE PIPE TO ENTER CHAMBER IN TOP PORT OF END PLATE OBSERVATION PIPE 16 CHAMBERS PER TRENCH 64 FEET — - 16'MIN o 0 CHAMBER DETAILS HOT TO 50M P.O. Box 2844 Glenwood Springs, Colorado 81602 Phone 970.618.5033 Fax 303.216.2796 Ercanbrack Residence 585 Cindy's Way Garfield, Colorado Project Number: 1694 W3.0 Sheet 3 of 4 Septic Tank with the Addition of an Effluent Filter -1250 Gallon, 2 -Comp. Concrete Risers, $lope Ground Away From Risers Top of tee to come to 1" from top of tank lid Inlet Tee t ORENCO BRAND NAME NOT ENFORCED Patents # 4,439,323 & 5,492,635 Foreign Patents Pending © 2002, Orenco Systems, Inc. 2" Liquid Level 0 TANK DETAIL NOT TO SCALE Filter Cartridge Handle (field cut to desired height) Tank Adapter (cast or bolted) Vent Orifice Effluent Discharge Modulating Discharge Orifices Vault Inlet Ports Filter Cartridge Effluent Filter P.O. Box 2844 Glenwood Springs, Colorado 81602 Phone 970.618.5033 Fax 303.216.2796 Ercanbrack Residence 585 Cindy's Way Garfield, Colorado Project Number: 1694 W4.0 Sheet 4 of 4 PITKIN COUNTY ENVIRONMENTAL HEALTH DEPARTMENT Percolation Test and Soils Data Form - TABLE 1 - PROJECT 1694 Performed by All Service Septic, LLC PROFILE PIT Date of Test: 3/19/2010 Must be dug when machinery is onsite, and prior to construction No Groundwater or Bedrock was Encountered Hole Hole Interval Measurement at Measurement at Change (in.) Percolation Rate No. Depth (in.) (min.) Start of Interval End of Interval (min./in.) MPI (in.) (in.) 1 30 20 11.75 13.25 1.50 20 13.25 14.00 0.75 20 14.00 14.50 0.50 20 14.50 15.00 0.50 20 15.00 15.50 0.50 20 15.50 16.50 1.00 2 29 20 12.25 14.00 1.75 20 14.00 14.75 0.75 20 14.75 15.75 1.00 20 15.75 16.75 1.00 fill 20 13.00 14.25 1.25 20 14.25 15.25 1.00 3 31 20 12.00 14.00 2.00 20 14.00 16.00 2.00 20 16.00 17.50 fill 20 13.50 14.50 1.00 20 14.50 15.50 1.00 20 15.50 16.50 1.00 AVG = 27 MPI 40 20 20