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Home My WebLink AboutOWTS System Design6147 Braun Court Arvada. C0 80004 303.908.7823 September 1, 2015 Ryan Ivy 717 County Road 120 Glenwood Springs, CO 81601 Subsurface Investigation and Onsite Wastewater Treatment System Design Lot 14, Lookout Mountain Ranches Garfield County, Colorado Project No. 48E Dear Mr. Ivy, ALL SERVICE septic, LLC reviewed subsurface conditions on August 28"' 2015, and completed an onsite wastewater treatment system (OWTS) design for the subject residence. The property is located outside of Glenwood Springs, in an area where OWTSs and wells are necessary. SITE CONDITIONS The property is currently vacant with the exception of a well and a driveway. A 4 -bedroom residence is proposed. The site is a wooded area that slopes to the east, and has a moderate cover of ground vegetation and evergreen trees. The Soil Treatment Area (STA) slopes 8% to the east. The proposed residence will have a 4 -bedroom STA, which will be located greater than 50 -feet from the proposed septic tank(s) and greater than 100 -feet from the proposed STA. The current land use for the STA is a wooded area. There is no planned construction on the STA after installation. The STA will be re -vegetated to native vegetation. Erosion control and re -vegetation will take place after OWTS construction. SUBSURFACE The subsurface was investigated by LKP Engineers on August 6th 2015, using a rubber tire backhoe, by digging three soil profile test pit excavations (Test Pits) 8 -feet (max) in depth. The materials encountered in the Test Pits consisted of Tight brown, moist topsoil to 2 -feet, underlain by silty red, slightly clayey sand with scattered gravel lenses and scattered Targe boulders up to 2 feet in diameter. Refusal by the large boulders was apparent in test pit #3. A long term acceptance rate (LIAR) of 0.6 gallons per square foot, will be used to design the OWTS, in accordance with Soil Type 0 outlined in Garfield County On -Site Wastewater Treatment System Regulations for STA's. Lot 14, Lookout Mountain Ranches Page 2 DESIGN SPECIFICATIONS The OWTS design is based on 4 bedrooms and 525 gallons per day proposed. Design Calculations 4 Bedroom = 525 gallons/day 525 / LTAR 0.6 = 875 SF 875 x 0.7 (chamber trenches) = 612 SF 612 / 12 SF = 52 chambers minimum (3' x 4' Q-4 chambers) Proposed 56 Quick -4 Chambers The installation must include a minimum 1250 gallon, two compartment septic tank with an effluent filter on the outlet. The tank must be approximately 18" below grade, with a maximum depth of 4.0 feet. Effluent will be directed via a 4" sched 40 PVC pipe to a distribution box. The distribution box should be brought to grade and have speed levelers to control effluent. Four chamber trenches, with each trench having 14 Q-4 chambers, for a total of 56 chambers must be installed. Effluent will be directed into the chamber trenches via a 4" PVC pipe placed in the top port of the end plate of the chamber. The bottom of the trench excavations must be free of boulders and/or large rocks. An observation pipe must be installed at the end of each trench. Observation ports may be capped and installed below grade in a sprinkler box. 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 to County Land Use Regulations, and On -Site Wastewater Treatment System Regulations, the OWTS Permit provided by the County, and this design. REVEGETATION REQUIREMENTS An adequate layer of good quality topsoil capable of supporting revegetation shall be placed over the entire disturbed area 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 placed 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. Lot 14, Lookout Mountain Ranches Page 3 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 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 control system 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. 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. Please call with questions. Sincerely, ALL SERVICE septic, LLC Timothy R. Petz Reviewed Jay: Richard H. Petr., WELL LOCATED 400+FT NORTHWEST OF PROPOSED STA N TEST PIT PROPOSED 4 -BEDROOM RESIDENCE TEST PITS 4" SDR 35 PVC SEWER PIPE (2% MIN FALL TO TANK) 1250 GALLON 2•COMPARTMENT SEPTIC TANK WITH EFFLUENT FILTER ON OUTLET 4" SDR 35 PIPE (1% FALL MIN) 4 GRAVELLESS TRENCHES EACH TRENCH WITH 14 CHAMBERS (3' X 4') TOTAL NUMBER = 56 CHAMBERS TOTAL AREA =672 SF LOT 14 - LOOKOUT MOUNTAIN RANCHES 0' 20' 40' 1"=40' OBSERVATION PORTS (TYP ) 4" SDR 35 PVC LATERALS DISTRIBUTION BOX BROUGHT TO GRADE APPROXIMATE DRIVEWAY SITE PLAN - LOT 14, LOOKOUT MOUNTAIN RANCHES O 6147 BRAUN COURT ARVADA, COLORADO 80004 PHONE- 303 908 7823 FAX: 303.206 2796 THE LOCATION OF EXISTING AND PROPOSE° IMPROVEMENTS MOAN ARE NOT THE RESULT Oi APROPERTV SURVEY THE LOCATIONS ARE APPROMTMTE ri IS THE MOUEOAMERS DUTY Ta ENSURE ALL { ONSTRUCRON AND PPROVENENTS LOCATI;;,Ns ARE ACCURATE ALL SE MACK INSTANCES SNOULD BE CDR, MINED PAM tO EXCAVATION Lot 14, Lookout Mountain Ranches 48E Garfield County Colorado ply= AT w1 1 OF 3 DESIGN 4 BEDROOMS - 525 GALLONS PER DAY TOTAL LOADING = 525 GALLONS PER DAY TREATMENT LEVEL - TLt SOIL TYPE - SANDY LOAM CALCULATED AREA = (525 10 6 LTAR) = 575 SF REDUCTION 30% • CHAMBERS = 612 SF 'QUICK - 4' CHAMBERS (12 SF PER CHAMBER). 56 TOTAL AREA PROPOSED = 672 SF TRENCH SPECIFICATIONS WIDTH OF TRENCHES = 3 FEET = 1 CHAMBERS LENGTH OF'OUICK-4' TRENCHES = 56 FEET = 14 CHAMBERS TOTAL NUMBER OF'OUICK•4' CHAMBERS = 56 INFILTRATOR(RI QUICK4(TMI CUT SHEET 4" PVC OBERVATION PIPE 12" PIPES TO ENTER IN TOP PORT OF CHAMBER END PLATE f s 34" PIPES PLACED IN TOP PORT FINISHED GRADE SEWER UNE - 4' SCHEDULE 40 P V.C. SLIP-ON PVC CAP DO NOT GLUE EFFLUENT UNE • SCHEDULE 40 OR 4' INSULATED SDR 35 COPPER TRACER PVC WIRE MAY BE INSTALLED TO LOCATE UNE N FUTURE SWEEP 12 WAY CLEANOUT DETAILS (N.T.S) TYPICAL DRAIN FIELD CROSS SECTION - TYP. 4" PVC 08ERVATION PIPE LMT OF EXCAVAT.ON PLAN VIEW -TYP. SCARIFY SURFACE PRIOR TO PLACEMENT OF CHAMBERS DISTRIBUTION 80X �—GRAM (1 CHAMBER BER'OU1CK-4 BSERVATION PIPE INFILTRATOR END PLATE 14 CHAMBERS PER TRENCH 56 8147 BRAUN COURT ARVADA, COLORADO 80004 PHONE 303908.7823 FAX 303 206 2796 SDR J 35 PVC PIPE FROM TANK {1% FALL TO TRENCHES) 1) 'r 6' min i Lot 14, Lookout Mountain Ranches a8E Garfield =candy Colnrad° am Ivy W2 23F? se ti CONCRETE UD FINISHED GRADE BOX AND COVER BROUGHT TO GRADE OUTLETS DISTRIBUTION BOX s DISTR BUTTON BOX BAFFLE OR ANGLED PIPE TO BE USED AT INLET Septic Tank with the Addition of an Effluent Filter -1500 Gallon, 2 -Comp. COaarete Mari Emma Are, From Peen to of tee to Come to r from top Of tank id KM tee ORENCO BRAND NAME NOT ENFORCED 6147 BRAUN COURT ARVADA. COLORADO 80004 PHONE 303.908 7823 F'AX. 303 206 2796 te Hondo (nekr cunt to�desred height) Tank Adopter (cater bolted) Vent Office Effluent Daehor9e Ikclulating Oetchcept Nikes Vasa wet Porte Filer Codrkge EfOoenl Filter Lot 14, Lookout Mountain Ranches 48E Garfield Counly Colorado ATN hr W3 3of3