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Home My WebLink AboutOWTS Engineered System Design Report 03.28.2010SEDVICEautt PO Box 2844 Glenwood Springs, CO 81602 Ph 970.618.5033 Fax 303.216.2796 March 8th 2010 Project No. 1686 Andrew Beuter and Karin Vondergoltz 6195 County Road 109 Carbondale, CO 81623 Onsite Wastewater System Design, Proposed 5 -Bedroom Residence 6195 County Road 109 Lot C, Beulah Wilson Sub. Exemption Garfield County, Colorado Andrew, ALL SERVICE septic, LLC evaluated the subsurface investigation prepared by HP Geo -tech, Job No 101 338C, and prepared an onsite wastewater system (OWS) design for the subject residence. The property is located in Garfield County, in an area where OWS are necessary. This letter is to be used in conjunction with plans provided. The site is served by an onsite well. SITE CONDITIONS A 5 -bedroom residence is proposed as indicated on Figure 1. The property is under construction and slopes approximately 5% to the east. There is an irrigation ditch to the east of the residence. SUBSURFACE The subsurface was investigated by HP Geo -tech by excavating one Profile Pit and three percolation holes as indicated on attached plans. HP Geo -tech indicated the test has a 1 -foot topsoil layer, underlain by sandy clay to 6.5 feet, underlain by gravelly sand to the maximum depth explored of 8 feet. Groundwater or bedrock was not encountered. Percolation rates ranged from 30 to 45 minutes per inch (MPI). A 35 MPI rate will be used to design the OWS. DESIGN SPECIFICATIONS The OWS design is based on 5 -bedrooms and an average sewage load of 750 GPD. The installation must include a 1000 -gallon, two-compartment, precast concrete septic tank, with the addition of an effluent filter, followed by a 500 -gallon plastic tank with a pump. Tank alternatives may be considered. One gravelless chamber bed must be installed as indicated on plans provided. Seven rows of 8 `ARC -36' chambers, for a total of 56 chambers, and 693 square feet (SF) of infiltrative area, is required. Pressurized 1.5 -inch laterals with 1/4 -inch orifices on 3.5 -ft centers must be suspended within each row of chambers. A level 1.5 -inch manifold will serve the laterals. Onsite Wastewater Systems Page 2 Construction must be according to the county ISDS regulations, the septic permit provided by Garfield County Environmental Health Department, and this design. This design for the subject properly, noted above, is valid only in conjunction with the approved County Health Department permit. 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 during and prior to 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. Septic tank risers should extend to grade. 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: 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 SERY.LC-Es ptic, LLC R - viewed eft Timothy R. 4 copies sent Onsite Wastewater Systems Page 3 56 'ARC -36' CHAMBERS WITH 1.5 PRESSURIZED LATERALS SUSPENDED FULL LENGTH OBSERVATION PIPE 100- • D., SEIBACR _(J 500 GALLON PLASTIC PUMP TANK. GPM = 49.0 GPM ITDH=30.3 FT 1000 -GALLON, TWO-COMPARTMENT PRECAST CONCRETE SEPTIC TANK WITH EFFLUENT FILTER ON OUTLET • NEIGHBOR 1IWELL 40'-0" LEM 11111.1 GARAGE s f .♦ PROFILE! Pa I P-1 o \ PARCEL C 20 aG 1NnaCc ;iE1NGK A!' 0' 25' 50' Scale: 1" = 50'-0" 2" SCHEDULE 40 PVC PUMP LINE TO COMPLETELY DRAIN AFTER EACH DOSE LOT C\ 2.06 AC± 0 UTILITY EASEMENT BE 1154 PG 993 tow Ns BGaOING VTQ.ca 0 SITE PLAN AND PROPOSED OWS t' - P.O. Box 2844 Glenwood Springs, Colorado 81602 Phone 970.618.5033 Fax 303.216.2796 N94 {. 26a.18 Beuter Residence 6195 County Road 109 Garfield County, Colorado Project Number: 1686 W1.0 Sheet 1 of 3 Septic Tank with the Addition of an Effluent Filter -1000 Gallon, 2 -Comp. Concrete Risara %Slope Ground �y Away From Risers Top of tee to come to 1" from top of tank lid Inlet Tee ORENCO BRAND NAME NOT ENFORCED 500 -Gallon, PLASTIC or CONCRETE Effluent Pumping Tank 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 ONE MANHOLE, RISER, AND LID FOR SEPTIC TANK ACCESS IS ACCEPTABLE PUMP MUST BE CAPABLE OF: 1. 49.0 GALS PER MINUTE 2. 30.3 FEET OF TOTAL DYNAMIC HEAD ELECTRICS: 1. A DEDICATED CIRCUIT SHOULD BE USED FOR PUMP AND ALARM/PANEL Inlet Tee 0 SEPTIC TANK DETAILS 3 • I¢0T sa SCRLF CONCRETE RISER AND LID Slope Ground Away from Riser Conduit to . b n Control Panel Conduit Seal PVC Splice Box with Cord Grips Fiberglass Gasketed Lid with Stainless Steel Bolts PNC Riser with Grommet(s) (bond to lank adapter with recommended adhesive) 1+, Discharge Assembly n - 1 --- ,I /--Flekible Hose V Effluent Discharge Liquid Level v 7 N, Tank Adapter (cast or bolted) Level Control Float Assembly Check Valve (optional) Effluent Pump Drain Port — —pump — Placed on Concrete Block ALL NVICE P.O. Box 2844 Glenwood Springs, Colorado 81602 Phone 970.618.5033 Fax 303.216.2796 Beuter Residence 6195 County Road 109 Garfield County, Colorado Project Number: 1686 W1.2 Sheet 3 of 3 Feb 09 10 07:11p Cairncross 9709£137496 p.6 101 338C APPROXIMATE SCALE = 60' PIT 2 ■ L 1 PARCEL B N BENCH MARK ND AT PROPERTY CORP EL — 100.0`. ASSUMED. P 3 P2 ❑ II PROFILE P 1 PIT PARCEL C • PARCEL D 1 1 EKISIING IRR KA11WN DITCH HEPWORTH-PAWLAK GEOTECHNICAL.. INC. LOCATION OF EXPLORATORY PITS AND PERCOLATION ZEST HOLES Fig. 1 Feb 09 10 07:12p Cairncross 970937496 p.7 5 ,— 15 - LEGEND: ti a _J NOTES: 1. Exploratory p 2. Locations of provided. 3. Elevatktis o shown an PIT 1 ELEV — 108.6' PIT 2 ' PROFILE PIT ELEV.0 111.2 ELEV.m 108.5' f TOPSOIL; sandy silt and clay. organic, firm. moist, dark brawn 0 5 --1 10 — 15 — CLAY (CO; silty, sandy with occasional gravelly zones and scattered cobbles, stiff, slight y moist to moist. brown. GRA rock. Hand 4. The cxpiorat by the meth 5. The Tines between ma 6. No free occur with 7. Laboratory DD c Dry i-4 = L (GM); silty. sandy. dense to very dense, moist light brown. subrounded liner sample_ bulk sample. is were excavated an Yoy 8. 2001 ' with a backhoe. exploratory pits were measured approximately by pacing frorn features on the site plan exploratory pits -were measured by instrument level and refer to the Bench Maio shown 1. Logs are drawn to depth. pit locations and elm:Ha►s should be considered oecurate only to the degree Implied d used. materials shown an the exploratory pit logs represent he approximate boundaries AA types and transitions may be graduaL was encountered in the pits at the tine of excavating. Fluctuations In water level may e. ng Results: Content ( X ) ItY(i ) t retained an No. 4 sieve —200 = Percent passing No. 200 sieve LL = Liquid lirnik (%) PI = Plasticity Index (% ) 101 338C 1 EPWORTH—PAWLAK EOTECHNICAL, INC. LOGS OF IDTLORATORY PITS Fig: 2 Feb 09 10 07:13p Cairncross 9709637498 p.11 HEPWORTH-PAWIAK GEOTECHNICAL, INC. TABLE II PERCOLATION TEST RESULTS J013140. 101 338C Note: Perc - etion test holes were hand dug and soaked on May i8, 2001. Percolation testing was erformed on May 9, 2001. The average percolation rate was based on the last three readings of each test. LENGTH OF INTERVAL (ION) WATER DEPTH AT START OF INTERVAL (INCHES) 9 WATER DEPTH AT END OF INTERVAL (INCHES) 8 DROP IN WATER LEVE. (INCHES) 1 AVERAGE PERCOLATION RATE (MIN./INCH) HOLE NO. HOLE DEPTH (INCHES) 45 15 P-1 32 S 7 34 % 7X NM % 6% 634 X 6% 5% 34 5% 5 1 Ye 5 4X I % 434 4 4 14 P-2 36 15 10 894 1 % 30 81 8 34 8 736 14 734 6 1 'b 634 634 34 6% 534 14 534 5% 34 534 4% % P-3 40 15 12 11 1 _30 11 10 35 % 10% 934 34 9 34 914 % 9 14 9 14 9 8 % 14 8 14 8 14 _ ..__ - 7 14. _._._... — _ Note: Perc - etion test holes were hand dug and soaked on May i8, 2001. Percolation testing was erformed on May 9, 2001. The average percolation rate was based on the last three readings of each test.