The URL can be used to link to this page

Home My WebLink AboutOWTS Design Report 10.03.2013SER!ICE October 3, 2013 PO Box 2844 Glenwood Springs, CO 81602 Ph 970 -618 -5033 Fax 303.216.2796 Dale Titus Drtitus0171 Agmail.com Subsurface Investigation and Onsite Wastewater Treatment System Design 4- Bedroom Residence 171 Fairway Lane Garfield County, Colorado Dale, Project No. C1058 ALL SERVICE septic, LLC performed a subsurface investigation and an onsite wastewater treatment system (OWTS) design for the subject residence. The property is located outside of Glenwood Springs, in an area where OWTSs are necessary. SITE CONDITIONS A 4- bedroom, single - family residence presently exists and is utilizing an existing OWTS. The house is undergoing a remodel which will not result in an increased bedroom count; however, the existing OWTS components will need to be relocated. A ditch runs along the west portion of the property. There must be a minimum 50 -foot setback from the ditch the absorption area. The tank must be located -at -least 5-feet-from-the-residence and the- drywell -a-ir inimur -of 25-feet-from-the-residence, SUBSURFACE The subsurface-was-investigated-by-digging-one—I-6-foot-profile pit and - three percolation-holes, as indicated. The materials encountered in the profile pit consisted of 7.0 -foot of dark brown, moist, clayey sand, underlain by light brown gravelly sand with 2 -inch to 6 -inch diameter cobbles to a depth of 13 -feet, underlain by light brown gravelly sand with 6 -inch tol -foot diameter cobbles to a maximum depth explored of 16 -feet. No groundwater or bedrock was encountered. An average of 31 MPI percolation rate will be used to design the OWTS, as described in Table 1. P1 5 -feet P2 8-feet P3 5 -feet Profile pit (16' with benches) Backfill (upper 7 -feet Backfiill (below 7 -feet Page 2 DESIGN SPECIFICATIONS The OWTS design is based on 4- bedrooms. An average daily wastewater flow of 900 GPD will be used. The installation must include a 1250- gallon, two - compartment septic tank with an effluent filter —on-th outlet -e Effluent will ravity- flowtto .ai °_xi 6 i2' deep drywell. De-pth of the dryw. 1l must be measured below the inlet pipe. The drywell will consist of clean, graded rock ranging from 1/2" to 2 1/2" in diameter. The rock will extend from the bottom of the well to at least 2" above the inlet pipe. The sidewalls of the drywell will be scarified. A covering of geotextile fabric will be placed over the aggregate before the drywell is covered with soil. The backfill material shall be graded to deflect precipitation and surface drainage. 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 Sewage Disposal Regulations, the Individual Sewage Disposal (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 Page 3 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 absorption area. No heavy equipment, machinery, or materials should be placed on backfilled absorption area. Livestock should not graze on the absorption area. 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 an absorption area. 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 the absorption area due to the potential to compact soil. Extensions should be placed on all septic tank components to allow access to them from existing grade. 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 x C Y o iL^I Carla Ostberg, MPH, REHS Page 4 awb :,... �/CF Reviewed By: : `` IiER9fi:v 1 f . �: o .. ,: 38882 r Richard H. Petz, i3: " • .:-.4k:: �11..,Ar ECG GARFIELD COUNTY Percolation Test and Soils Data Form - TABLE 1 - PROJECT C1058 Performed by All Service Septic, LLC PROFILE PIT 16 -feet Date of Test: 9/30/13 0 to T Sand, clayey, dense, moist, dark brown 7' to13' Sand, gravelly, light brown, cobbles 2" to 6" in diameter 13' to 16' Sand, gravelly, light brown, cobbles 6" to 1' in diameter Hole No. Hole Depth Interval Measurement at Measurement at Change (in.) Percolation Rate (in.) (min.) Start of interval End of Interval (min./in.) MPI (in.) (in.) 1 60" 10 7.50 7.75 0.25 10 7.75 8.00 0.25 10 8.00 8.125 0.125 0.125 10 8.125 8.25 10 8.25 8.50 0.25 0.25 40 10 8.50 8.75 10 8.75 9.0 0.25 2 60" 10 6.25 6.50 0.25 10 6.50 6.75 0.25 10 6.75 7.25 0.50 10 7.25 7.50 0.25 10 7.50 7.75 0.25 10 7.75 8.00 10 8.00 825 0.25 025- 40- - - - -- 3 96" 10 5,50 6.50 1,00 -- - 1.00 0.75 10 6.50 7.50 add water 10 7.00 7.75 add water 10 5.25 6.00 10 6.00 6.75 0.75 0.75 10 6.75 7.50 0.75 13 AVERAGE = 31 MPI LOT 29 2 ti 50' MIN. 0 16' x 16' x 12' DRYWELL WITH 4' CONCRETE PERFORATED RISERS 4" DIA SDR 35 SEWER LINE (SLOPE 2 1% MIN TO DRYWELL) 1250- GALLON, TWO - COMPARTMENT, CONCRETE SEPTIC TANK WITH EFFLUENT FILTER 4" DIA SDR 35 SEWER LINE WITH CLEANOUT (SLOPE 2% MIN TO TANK) N 0' 15' 30' Scale: 1" = 30' =0" 00 PROPOSED ADDITION LOT 30 1.131 ACRES 4- BEDROOM RESIDENCE 1 - -- - - --- 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. OWTS SITE PLAN AND PROPOSED O = 7 (' rho Date: 10/03/13 Designed By: CBO Checked By: RHP Drawn By: ANG P.O. Box 2844 Glenwood Springs, Colorado 81602 Phone 970.618.5033 Fax 303.216.2796 Titus Residence 171 Fairway Lane Garfield County, Colorado Project Number: C1058 W1.0 Sheet 1 of 3 PLAN VIEW SWALE OR BERM TO DIVERT SURFACE RUNOFF DRYWELL DRAIN FIELD SPECIFICATIONS 4" PVC INLET LINE I FROM SEPTIC TANK MANHOLE COVER CROSS SECTION NATURAL GRADE INLET FROM SEPTIC TANK EXTENT OF EXCAVATION SLOPE FOR DRAINAGE 16' DISPERSAL GRAVEL SHOULD 16' BE 1/2" TO 2 1/2" 12' a 4 - SIDES OF EXCAVATION OBSERVATION PIPE WITH PVC CAP CONCRETE LID WITH MANHOLE COVER PLACE AN 8 -INCH BED OF GRAVEL - PRIOR TO PLACING CONCRETE RINGS FOR STABILITY 16' DRYWELL DETAILS NCI -O SCA F P.O. Box 2844 Glenwood Springs, Colorado 81602 Phone 970.618.5033 Fax 303.216.2796 Titus Residence 171 Fairway Lane Garfield County, Colorado Project Number: 01058 GEO- FABRIC DISPERSAL GRAVEL BERM OR SWALE SLOTTED PVC OBS. PIPE TO EXTEND TO BOTTOM OF DRYWELL 4 FOOT DIAMETER CONCRETE PERFORATED RINGS Date: 10/03/13 Designed By: CBO Checked By: RHP Drawn By: ANG W2.0 ShAnt 2 of 3 DESIGN 4- BEDROOM RESIDENCE (75 GAL /PERSON /DAY x 2 PERSONS /BEDROOM x 4 BEDROOMS) AVERAGE DAILY FLOW = 600 GALLONS DESIGN FLOW = Q = 1.5 x 600 = 900 GALLONS TANK: 900 x 30 HOUR RETENTION TIME = 1125 GALLONS USE 1250 - GALLON, TWO- COMPARTMENT TANK ABSORPTION AREA: PERC RATE = 31 MPI CALCULATED ABSORPTION AREA = QI5 X SQRT 31 = 1002 SF 16 FT LONG X 16 FT WIDE X 12 FT DEEP BELOW INLET = 1024 SF FINISHED GRADE SEWER LINE - 4" SCHEDULE 40 P.V.C. SLIP -ON PVC CAP DO NOT GLUE EFFLUENT LINE - 4" SCHEDULE 40 OR 4" SDR 35 P.V.C. INSULATED COPPER TRACER WIRE MAY BE INSTALLED TO LOCATE LINE IN FUTURE CLEANOUT DETAIL Septic Tank with the Addition of an Effluent Filter -1250 Gallon, 2 -Comp. Concre.o Rises S cpe Grou'rc Awcy Frorn disc's Tap of tee to come tc 1" from top a{ tank lid Inlet Tee \� ORENCO BRAND NAME NOT ENFORCED 2" v Liq.lc _eve' TANK DETAIL NCI TO SCALE ter Cartridge Handle (acid cut to dcsircd height) Tan( Adapter 'cost or batted) Ven: O'itice Gent Discharge Moc. Io: ng Dischorge Orifices Va.; t inlet Forts -; ter Cartridge 1" uent Filter Date: 10/03113 Designed By: CBO Checked By: RHP Drawn By: ANG 'DU BICE P.O. Box 2844 Glenwood Springs, Colorado 81602 Phone 970.618.5033 Fax 303.216.2796 Titus Residence 171 Fairway Lane Garfield County, Colorado Project Number: C1058 W3.0 ShRRI 3 nE 3