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Home My WebLink AboutSubsurface Investigation and OWTS Design 11.29.09POBox2844 Glenwood Springs, CO 81602 Ph 971Hi18-5033 Fax 303-216-2796 November 29111 2009 Ted Hutchison PO Box 2711 Glenwood Springs, CO 81602 Project No. 1668 Subsurface Investigation and Onsite Wastewater System Design, 2-Bedroom Residence 49897 Highway 6 and 24 Garfield County, Colorado Ted, ALL SERVICE septic, LLC performed a subsurface investigation and an onsite wastewater system (OWS) design for the subject residence. The property is located outside of West Glenwood, in an area where OWS and wells are necessary. SITE CONDITIONS The subject lot is presently vacant. A 3-bedroom residence is proposed as indicated on Figure 1. The proposed drain field area lies to the southwest of the proposed residence . The area of the proposed drain field has sparse large rocks that have toppled from cliffs above , and the vegetation consists of a moderate cover of native grasses. Water will be served to the residence via an onsite well. SUBSURFACE The subsurface was investigated by digging one profile pit and three percolation holes, as indicated. The materials encountered in the profile pit consisted of a I-foot sandy root zone , underlain by clayey sand with scattered angular rocks to the maximum depth explored of 7 feet. Groundwater or bedrock was not encountered. Three percolation holes were dug, in the area of the proposed drain field , as indicated. Percolation rates ranged from I 0 to 14 minutes per inch (MPI). A 13 MPI rate will be used to design the OWS. DESIGN SPECIFICATIONS The OWS design is based on 3-bedroom and an average sewage load of 450 GPO. The installation must include a I 000-gallon, two-compartment. precast concrete septic tank, with an effluent filter on the outlet, followed by 3 gravelless trenches. Each trench must have 11 ·Quick-4' chambers, for a total of 33 chambers, equaling 326 SF of infiltrative area. Serial distribution may be used to distribute effluent. Onsite Wastewa1er System Page2 Construction must be according to the Garfield County Health Department OWS regulations, the OWS Construction Permit provided by the county, and this design. 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. LIMITS: Onsite Wastewater Systems Page 3 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. Sincerel y. 3 copies - SITE PLAN -- I I ---/ - - -· -- ALL SERVICE Septic, LLC - c Cl c c PROFILE AND PERCOLATION HOLES / / -------/ - ~ / / [QI PROPOSED 3-BEOROOM I I RESIDENCE WELL IN SHED ----------- ~ .,,,,,,.,.- .,,,,,,.,.- 49897 HIGHWAY 6 AND 24 PO Box 2844, Glenwood Springs, CO 81602 HUTCHINSON RESIDENCE 970-618-5033 GARFIELD COUNTY, COLORADO / - .,,,,,.- -- ,,,,.-..- ------- / .---/ ~\AO$ --<f\.'C.~ / -· ---/ ~ - .,,,,--,,,.,,.,... \N1E.~s1 p.\E. '\-70 . . ~ --- / ·----· --· --- . . ONSITE WASTEWATER SYSTEM DESIGN FIGURE I N J -------: --/ ------/ ,...,.. -· -· ·---I I . . . . . . . . . . . . . . . . . . ~ PRO NO. 1668 11/29/09 PROPOSED OWS PROPERTY LINE NOTE: N ' D. W SCALE: 1" .,,. = 40' IF SEWER PIPES ARE UNDER DRIVE , BLUE BOARD SHOULD BE USED TO INS ULA TE 1000-GALLON, TWO-COMPARTMENT PRECAST CONCRETE SEPTIC TANK WITH EFFLUENT FILTER ON THE OUTLET 4" SEWER PVC PIPE\ (2% FALL TO TANK) CLEANOUT ~ ,.--------., APPROXIMATE LOCATION OF PROPOSED 3-BEDROOM RESIDENCE OBSERVATION PIPES (TYP) 4 " SOR 35 PVC PIPE (1% FALL TO TRENCHES) G ~f~m' ----\-----~SURFACE ROCKS b I I I~ I ! I I i•l>-:-_..1, -~e~;~~~ SERIAL THREE GRAVELLESS CHAMBER TRENCHES . EACH/ TRENCH WITH 11 'QUICK-4' CHAMBERS. TOTAL AREA= 326 SF IF ARC 36-CHAMBERS ARE USED A MINIMUM OF 26 CHAMBERS ARE REQUIRED 49897 HIGHWAY 6 AND 24 PIPES (1% FALL TO NEXT TRENCH ALL SERVICE Septic, LLC 50'tola~ THE LOCATION OF EXISTING AND PROPOSED IMPROVEMENTS SHOWN ARE NOT THE RESULT OF A PROPERTY SURVEY THE LOCATIONS ARE APPROXIMATE. IT IS THE HOMEOWNERS DUTY TO ENSURE ALL CONSTRUCTION AND IMPROVEMENTS LOCATIONS ARE ACCURATE. ALL SETBACK DISTANCES SHOULD BE CONFIRMED PRIOR TO EXCAVATION. PRO. NO . 1668 HUTCHINSON RESIDENCE PO Box 2 8 <14, Gl e nwood Springs, CO 81602 FIGURE 2 GARF IELD COUNTY COLORADO 970-618-5033 DESIGN 3·BEOROOM RESIDENCE LOADING= q = 450 GALLONS PER DAY PERCOLATION RATE= 13 CALCULATED AREA= ((1 .5 X q) x sqrt 13) / 5) = 487 SF PROPOSED AREA = 487 SF X 40% REDUCTION = 293 SF TRENCH SPECIFICATIONS WIDTH OF TRENCHES = 3 FEET= 1 CHAMBERS LENGTH OF 'QUICK-4' TRENCHES = 44 FEET= 11 CHAMBERS TOTAL NUMBER OF 'QUICK-4' CHAMBERS = 33 TOTAL INFILTRATIVE AREA = 326 SF THREE TOTAL TRENCHES DRAIN FIELD CROSS SECTION· TYP. UNDISTURBED SOJL 4"PVC OBERVATION PIPE 2'min SLIP-ON PVC CAP DONOTGLUE FINISHED GRADE ----..L.~==:j~_EFFLUENT LINE ·4"---- SCHEDULE SEVVER LINE ·4" SCHEDULE 40PVC. 400R4" SDR35 P.V.C. SWEEP/ 2 WAY CLEANOUT DETAILS (N .T S) TYPICAL INF l TRATOR(R) OUICKl.(-M) CUT SHEET INSULATED COPPER TRACER WIRE MAYBE INSTALLED TO LOCATE LINE IN FUTURE 4"PVC OBERVATION PIPE ----52"--++-.. LIMITO EXCAVATION 6'min ~J \GRAVELLESS CHAMBER (4 ' x 3') +~·~JMJ/= PIPES TO ENTER/ AND EXIT IN TOP PORT OF 1----------------------------------~CHAMBEREND PLATE PLAN VIEW -TYP. GRAVELLESS CHAMBER 'QUICK-4' 4" PVC PIPE . SERIAl-- OVERFLOW LINES TO BE INSTALLED IN 'HIGH' PORTS ON END PLATES . 0 OBSERVATION PIPE Undisturbed Soil Between Trenches 11 CHAMBERS PER TRENCH 0 ;·----44'----i INFILTRATOR END PLATE PROJECT NO. 1668 t 6'min 4"SDR 35 PVC PIPE FROM TANK (1 % FALL TO TRENCHES) FIGURE3 Septic Tank with the Addition of an Effluent Filter -1000 Gallon, 2-Comp. Top of tee to come to 1" from top of tonk lid Inlet Tee · ,>.J ' ~ • I ORENCO BRAND NAME NOT ENFORCED Potents # 4,439,323 & 5,492,635 Foreign Potents Pending e 2002, Orenco Systems, Inc . ~ u 2" J liquid Level filter Cartridge Handle (field cut to desired height) Tonk Adopter (cost or bolted) '---Vent Orifice Effluent Discharge " n-Modulating Discharge Orifices 1 1 1 Vault Inlet Ports Filter Cartridge Effluent Filter PROJECT NO 1668 PROFILE HOLE INFORMATION ALL SERVICE septic, LLC 970-618-5033 Iii w u. ' I ~ w 0 2 3 4 5 6 7 8 9 10 PROFILE :·.·: •. TOPSOIL, ROOT ZONE, SANDY SAND, CLAYEY, WITH SCATIERED ROCK, DENSE, MOIST, RED NO GROUNDWATER ENCOUNTERED DURING DIGGING PROJECT NO. 1668 [ GARFIELD COUNTY ENVIRONMENTAL HEAL TH DEPARTMENT Percolation Test and Soils Data Form -TABLE 1 -PROJECT 1668 Performed by All Service Septic, LLC PROFILE PIT Date of Test: 11/18/2009 0 -1.0' Root Zone, Sandy Clay, Brown 1.0 '-7.0' Sand, Clayey with Scattered Rocks, Dense, Moist, Red No 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 .fin .) MPI (in .) (in .) 1 31 10 3.50 4 .50 1.00 10 4 .50 6.00 1.50 fill 10 1.75 2 .50 1.75 10 2 .50 3 .50 1.00 10 3.50 4.25 0 .75 14 10 4.25 5 .25 1.00 2 40 10 3.75 5.25 1.50 10 5.25 7 .00 1.75 10 7 .00 dry fill 10 3.25 4 .25 1.00 10 10 4.25 5.50 1.25 10 5 .50 6 .75 1.25 3 39 10 2 .50 3 .50 1.00 10 3 .50 4 .50 1.00 10 4 .50 5.25 0.75 10 5.25 6.00 0.75 10 6 .00 7 .00 1.00 10 7.00 7.75 0.75 14 AVG= 13 MPI