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HomeMy WebLinkAboutSubsurface Analysis & OWTS Design 09.28.201433 Four Wheel Drive Rd Carbondale, CO 81623 970.309-5259 September 28, 2014 Nicole Holowaty ECOS Environmental & Disaster Restoration Inc. nholowaty@ecosenvironmental.com Project No. C 1094 Subsurface Analysis and Onsite Wastewater Treatment System (OWTS) Design Commercial Office Building 6690 Hwy 82 Garfield County, Colorado Nicole, ALL SERVICE septic, LLC has completed an onsite wastewater treatment system (OWTS) design for the subject property. A commercial warehouse building has been constructed and there are plans to incorporate plumbing and create usable office space within the building. The property is located outside of Glenwood Springs, in an area where OWTSs and wells are necessary. SITE CONDITIONS A commercial warehouse building with only roughed-in plumbing presently exists on the northern portion of the property. An existing 2-story office building, single-family residence, and two shops are present on the southern portion of the property. A private well is located to the south of the two-story office building and single family residence. This well will be greater than 1 OD-feet from the proposed soil treatment area (STA) that will serve the new commercial warehouse building. A dry gulch is located along the western portion of the property. A minimum 25-foot setback must be maintained to any OWTS component. A 10- foot property line setback must also be maintained to any OWTS component. A water line runs near the proposed STA This waterline must be either relocated greater than 25-feet from the proposed STA or encased in accordance with Table 7-1, footnote 2 of the Garfield County On-Site Wastewater Treatment System Regulations. The well on the neighboring property to the west is located greater than 100-feet from the proposed ST A An existing OWTS serves the existing 2-story office building and single family residence. This system will remain in use and is not part of this proposed OWTS design. SUBSURFACE The subsurface was investigated on September 17, 2014 by digging one 8-foot soil profile test pit (Test Pit) and conducting a tactile evaluation of the soils. Due to site constraints and the rocky condition of the Test Pit, only one soil profile test pit was excavated. The materials encountered in Test Pit #1 consisted of reddish brown sand with single grain shape, weak structure, and loose consistence with 2 to 6-inch diameter cobbles to 4-feet, underlain by reddish brown sand with 1 to 2-foot diameter cobbles to a maximum depth explored of 8.0-feet. No bedrock or groundwater was encountered. Page 2 A long term acceptance rate (L TAR) of 0.8 gallons per square foot will be used to design the OWTS, in accordance with Table 10-1 Soil Type 1 presented in the Garfield County On-Site Wastewater Treatment System Regulations, adopted April 14, 2014. Percentage of rock exceeds 35%, requiring soil replacement. Test Pit #1 DESIGN SPECIFICATIONS The proposed plumbing in the commercial warehouse building will include two toilets, two lavatories, one shower, a kitchen sink, a dishwasher, and a washing machine for use by eight, 8-hour office shift employees and two employees. We highly recommended installation of a flow meter to monitor actual flows into the OWTS. No floor drains may be discharged into the OWTS. The OWTS is designed to accommodate domestic wastewater only. Wastewater Flow= Q = [(8 employees) x 15 GPD] + [(2 employees shower) x 14.7 GPD] + [(2 cycles washing machine/day x 19.5 GPD)] = 188.4 GPD USING 270 GPO ESTIMATED DESIGN FLOW Minimum tank size = 548-gallons Sand = 0.8 gallons/square foot 270 I 0.8 = 338 square feet 338 square feet x 1.1 (dosed bed) x 0.9 (Eljen® Modlues) = 334 square feet The system installation will include a new 1000-gallon, two-compartment concrete septic tank with an H- 20 rated lid for installation under an existing driveway and an effluent filter on the outlet tee followed by an additional 500-gallon dosing chamber with an H-20 rated lid and a 300 series dosing siphon. The siphon should dose 3 times per day, 90 gallons per dose. An 8' x 41' area will be excavated to a depth of approximately 2.5-feet below native grade. The bottom of this excavation must be level. Twelve-inches of concrete sand (ASTM 33) will be placed in the excavation below the modules. Effluent will be dosed to three rows of 10 Eljen® A42 Modules connected with a level manifold. There must be at least 6-inches of concrete sand surrounding all sides of the modules. A geotextile fabric will cover the sand and modules. There must be a minimum of 1-foot of cover over the modules. Where the waterline comes within 25-feet of the ST A, it must be properly encased in accordance with Garfield County On-Site Wastewater Treatment System Regulations, Table 7-1, footnote 2. Page 3 "Crossings or encroachments may be permitted at the points as noted above provided that the water or wastewater conveyance pipe is encased for the minimum setback distance on each side of the crossing. A length of pipe shall be used with a minimum Schedule 40 rating of sufficient diameter to easily slide over and completely encase the conveyance. Rigid end caps of at least Schedule 40 rating must be glued or secured in a watertight fashion to the ends of the encasement pipe. A hole of sufficient size to accommodate the pipe shall be drilled in the lowest section of the rigid cap so that the conveyance pipe rests on the bottom of the encasement pipe. The area in which the pipe passes through the end caps shall be sealed with an approved underground sealant compatible with the piping used." 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 On-Site Wastewater Treatment System Regulations, the OWTS Permit provided by Garfield County Building Department, and this design. REVEGETA TION 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 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 soil treatment areas, and any other components needing maintenance. Geo-fabrics or plastics should not be used over the ST A. 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 a STA. 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. 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 Page 4 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 Reviewed By: (~~l:-s Carla Ostberg, MPH, REHS Liability Clause: Under no circumstances whatsoever shall the liability of ALL SERVICE septic, LLC, in connection with any contract, directly or indirectly, exceed the total amount paid by the client to ALL SERVICE septic, LLC for the services and/or goods whicn are the subject of the contract in connection with which the liability arises. N { ~ O' 25' 50' Scale: 1" = 50'·0" ~ ( / 33 Four Wheel Drive Road Carbondale, Colorado 81623 Phone 970.309.5259 carla@allserviceseptic.com \ . ""·· ··'"'-- ., ,,,~:, '· ,_ ECOS Environmental 6690 Highway 82 Garfield County, Colorado Project Number: C1094 ... -~~ ) 1 SITE PLAN Date: 09128114 Designed By: CBO Reviewed By: RHP Drawn By: ANG ' --o W1.0 Sheet 1 of 4 DESIGN COMMERCIAL WAREHOUSE BUILDING 8 OFFICE EMPLOYEES (8-HOUR SHIFTS) 15 GPO X 8 EMPLOYEES 2 EMPLOYEE SHOWERS/DAY X 14.7 GPO 2 CYCLES WASHING MACHINE/DAY X 19.5 GPO WASTEWATER FLOW= Q = 188.4 GPO USING ESTIMATED 270 GPO DESIGN FLOW TANK: 270 GPO x 48 HOUR RETENTION TIME= 540 GALLONS USE 1000-GALLON, TWO-COMPARTMENT TANK 500-GALLON DOSING CHAMBER WITH SCREENED DOSING SIPHON SOIL TREATMENT AREA (ST A): LONG TERM ACCEPTANCE RATE: 0.8 GAL/SQ FT OIL TAR= 338 SF DOSED ELJEN BED TOTAL AREA REQUIRED= 334 SF BED, 3 ROWS OF 10 MODULES 6-INCHES SAND SURROUNDING BEWTEEN AND ALL ALL SIDES OF MODULES TOT AL FOOTPRINT = 8 FEET x 41 FEET 25' MIN SETBACK "'------~T.o ANY WATERLINE UNLESS PROPERLY ENCASED ALL• ~IHIUU -::o~""-"'s+l'-1:\'ITH THREE ROWS EXISTING SHED TO BE REMOVED /~·. ,/' ~'-...,, ----. OF 10 'ELJEN' A ODULES OVER 1' OF ASTM C3 CONCRETE SAND = 334 S PROVIDE 6" OF SAND BETW MODULES AND AROUND ALL SIDES OF STA ® PROPOSED OWT~ _ • 6 33 Four Wheel Drive Road Carbondale, Colorado 81623 Phone 970.309.5259 carla@allserviceseptic.com EGOS Environmental 6690 Highway 82 Garfield County, Colorado ProjectNumber: C1094 -----~- Date: 09128/14 Designed By: CBO Reviewed By: RHP Drawn By: ANG O' 10' 20' Scale: 1" = 20'·0" W2.0 Sheet 2 of 4 SECTION VIEW 12" IN PLAN VIEW 3" OR 4" DIA SDR-35 SEWER LINE FROM DOSING TANK 1" ASTM C33 CONCRETE SAND ~--'ELGEN' A42 MODULE 25' 6" CONCRETE SANO BETWEEN MODULES AND AROUND ALL FOUR OUTIER SIDES 'ELGEN' A42 MODULE ------------------41''---or--------------' 33 Four Wheel Drive Road Carbondale, Colorado 81623 Phone 970.309.5259 carla@allservlceseplic.com INSPECTION PORT AT OPPOSITE CORNERS OF STA 3" OR 4" DIA SDR-35 PERFORATED SEWER LINE EXTENDED THROUGH MODULE ROWS 0 ELGEN ST A DEL~lfok SEWER LINE- 4" SCHEDULE 40 P.V.C. SLIP-ON PVC CAP DO NOT GLUE INSULATED COPPER TRACER WIRE MAY BE INSTALLED TO LOCATE LINE IN FUTURE ECOS Environmental 6690 Highway 82 Garfield County, Colorado Project Number: C1094 Date: 09128114 Designed By: CBO Reviewed By: RHP Drawn By: ANG W3.0 Sheet 3 of 4 Septic Tank with the Addition of an Effluent Filter -1000 Gallon, 2-Comp. Concrete Risers Slope Ground ~ Away From Risers ~ Filter Cartridge Handle (field cul to desired height) Tank Adopter (cost or bolted) ,.] Liquid -Level ®TANK DETAIL ""' IO!iNl Effluent Discharge Modulating Discharge Orifices -++---Yoult Inlet Ports Fllter Cartridge Effluent Filler 500-Gallon Concrete Septic Tank with Screened Dosing Siphon 33 Four Wheel Drive Road Carbondale, Colorado 81623 Phone 970.309.5259 car1a@allseivlceseptlc.com Inlet Tee ~----Concrete Riser and Lid lo Surface p--r~'""~~T-;::===-1Riser to grade 1" Vent Piping 1.===='f:I===t't-lJ--Tonk Adopter (cost or bolted) --++--tt---Cord lo Dose Counter Dosing Siphon Effluent Discharge · · J-\';'f'-~r'r--o~mum 4' dio. tronsport line required) ~-----Fiberglass Mounting Brocket ©TANK DETAIL Mi,..., EGOS Environmental 6690 Highway 82 Garfield County, Colorado Project Number: C1094 Date: 09128/14 Designed By: CBO Reviewed By: RHP Drawn By: ANG W4.0 Sheet 4 of4 Submittal Data Sheet Flow Meters Applications Flow Meters are used to measure cumulative hydraulic flow through a transport line, using an analog display with an odometer-type totalizer. They precisely measure variable flows of filtered effluent. Model FM200 Model FM100U Specifications FM062IU) FM075IU) Length I 71/2 in. 9 in. (191 mm) (229 mm) Length with unions I 12 in. 131/2 in. I (305 mm) (343 mm) Width 4 5/8 in. 51/4 in. l117mm) (133mm) Height 4 9/16 in. 51/8 in. I (116mm) (130 mm) Normal flow range 1-10 gpm 2-15 gpm 14-38 ljm) (8-57 lJm) Maximum intermittent flow 20 gpm 30 gpm I 176 lJm) (114 lJm) Low flow registration i 1/4 gpm 1/2 gpm (95% level) (0.9 lJm) (1.9 lJm) Maximum pressure I 150 psi 150 psi I (1033 kPa) 11033 kPa) Meter connection i 1 in. 1 in. I male thread male thread Meter connection w'1th un·1on j 1 in. slip 1 in. slip Head loss, ft ! 0.04 x 02 0.022 x 02 (where Q = gpm) i Head loss, m 0.04 x 13.79 x Q)' 0.022 x (3.79 x Q)' (where Q = ljmin) © 2005 Orenco Systems' Inc. Standard Models Oreno;:o Systems· Incorporated 800-348-9843 FM062, FM062U, FM075, FM075U, FM100, FMlOOU, FMl 50, FM200 Nomenclature FM DODD T1ndicates connection style: Blank = male threaded connection (FM062, FM075, FM!OO); female threaded connection (FM 150, FM200) U = with unions, slip connection (FM062, FM075, FMIOO only) eter size (inches): 062 = 51/l" 075 = 3/4" 100 = I" 150 = I 112" 200 = 2" Flow meter Materials of Construction Main Case: Register Box: Bottom Plate: Casing Bolts: Magnets: Strainer: Bronze Bronze Bronze Stainless steel Plasticized material Synthetic polymer Unions: Flanges: Schedule 80 PVC IFM062, FM075, FM100) Bronze IFMl 50, FM200) FM100IUl FM150 10 3/4 in. 13 in. (273 mm) (330 mm) 16 in. - (406 mm) 6 3/4 in. 8 3/4 in. (171 mm) (221 mm) 5 3/4 in. 6 7/8 in. (146mm) 1175 mm) 3-25 gpm 5-50 gpm 111-95 lJm) (19-190 ljm) 50 gpm 100 (190 lJm) (379 ljm) 3/4 gpm 11/2 gpm (2.8 lJm) 15.7 lJm) 150 psi 150 psi (1033 kPa) (1033 kPa) 11/4 in. 11/2 in. male thread female thread 11/4 in. slip - 0.007 x 02 0.0027 x 02 0.007 x (3.79 x Q)2 0.0027 x 13.79 x Q)' FM200 17 in. 1432 mm) - 9 3/4 in. (248 mm) 7 1/2 in. (191 mm) 8-80 gpm (30-303 ljm) 160 (606 lJm) 2 gpm (7.6 lJm) 150 psi (1033 kPa) 2 in. female thread - 0.0012 x 0 2 0.0012 x (3.79 x Q)2 NSU·fM·fM-1 Rev. 4.0, © 6/05 Page 1ol1