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Home My WebLink AboutEngineer's OWTS Design PlanI29 CAINS LANE CaReoNoem, CO A1623 970.309.5259 CARLA.oSTBERG@GMAIL.cOM lJttP'l. I (' ( :(.) t\sa; r,'l' I N(; December 16,2022 Project No. C1779 Bucky Schafer buckv@schaferandco. com Onsite Wastewater Treatment System Design 252Coryell Ridge Road (CR 167) Garfield County, Colorado Bucky, CBO lnc. performed a subsurface investigation and completed an onsite wastewater treatment system (O\AfIS) design for the subject residence. The 66,646 square foot property is located outside of Glenwood Springs, in an area where OWTSs and wells are necessary. Legal Description: Parcel lD: 2395-014-00-057 SITE CONDITIONS The property is currently developed with two large commercial buildings. Two OWTSs currently exist on the property, and both will be abandoned. Building A is located in the southeast portion of the properS. This building is a 6000 square foot office building that will have six 8-hour office employees. Fixtures may include two toilets and lavatories and a kitchen sink in a kitchenette. Building B is located in the southern portion of the property, to the west of Building A. This building is a 7200 square foot office building with a two-bedroom apartment in a 2000 square foot proposed addition to the north of the existing building footprint. Building B will also have six 8-hour office employees and fixture may include two toilets and lavatories in the warehouse portion of the building and one toilet and lavatory in the office portion of the building. The structures on the property will be served potable water from a well located along the southern property boundary between the existing buildings. This well does not produce much water and there is consideration of re-drilling the well in a new location on the property. Any existing or future well must be at least SO-feet from any septic tank (either on the subject property or a neighboring property) and at least 1O0-feet from any soiltreatment area (STA). The proposed soil treatment area (STA) will be located on the northwestern portion of the property near the entrance to the property and paralleling the northern property boundary. The location is relatively flat. The proposed area is vegetated with grasses, but has been used as a parking and storage area previously. The soils are rocky and an over-excavated sand filter is proposed. There should be no future kaffic or staging of material over the STA site. Page2 SUBSURFACE The subsurface was investigated by HP Geotech, Job 199 497, and is documented in a Subsoil Study for Foundation Design report dated July 16, 1999. Three pits were excavated in the area of then-proposed Building A. A sample was taken from the Pit 1 between 3.5 and 4.S-feet below grade. Soils consisted of 620/o gravel, 24o/o aand, and 14o/o silt and clay. Soils are described as silty sandy gravel with cobbles. The report is enclosed. An additional subsurface investigation was performed by Kumar and Associates, Project 19-7-171, and is documented in a Subsoil Study for Foundation Design report dated March 26,2019. Two borings were drilled in the area of then-proposed Building B. A combined sample was taken from Boring 1 at2.5 and 5- feet below grade. Soils consisted of 50o/o gravel, 397o sand, and 11o/o silt and clay. A combined sample was taken from Boring 2 at2.5 and S-feet below grade. Soils consisted of 57% gravel, 33% sand, and 10% silt and clay. Soils are described as slightly silty sandy gravel. The report is enclosed. Both reports indicate soils are consistent with Soil Type R-0. An over-excavated, unlined sand filter with a minimum of 3-feet of sand filter material (Secondary Sand) is proposed. A long term acceptance rate (LTAR) of 0.8 gallons per square foot will be used to design the OWTS. Prior to installation, an additional $-foot deep soil profile test pit must be excavated adjacent to the proposed SIA. Ihrb office must be contacted to verify fhe so/s are const'sfent with fhose descnbed in the HP Geotech and Kumar andAssocrafes reporfs. DESIGN SPECIFICATIONS The existing septic tanks will be abandoned by pumping the tanks and removing it or crushing the top, bottom, and sides and filling in the void with onsite materials. The existing STAs will be abandoned in place. Desiqn Qalculations: Building A: 15 GPD x 6 employees = 90 GPD Building B: 15 GPD x 6 employees = 90 GPD 2-bedroom apartment x 2 people/bedroom x 75 GPD = 300 GPD Average Design Flow = 300 GPD + 90 GPD + 90 GPD = 480 GPD Design Flow= 500 GPD LTAR = 0.8 GPD/SF 500 GPD / 0.8 GPD/SF = 625 SF Page 3 The OWTS design is based on an anticipated 12 total 8-hour employees and a 2-bedroom apartment. An average daily wastewater flow of 500 GPD will be used. It should be noted that there are utilities throughout the site, including gas and electric lines. These are located on the survey; however, locates should be done prior to excavation of OWTS components. The proposed septic tank is in an area of the existing gas line with the proposed sewer lines crossing the existing gas line. This gas line may need to be relocated. For the purposes of this OWTS design, Benchmark Elevation at grade 5978' has been established as 100'(Approximate Main Level Finished Floor Building B). An ejector pump inside Building B will likely be necessary from the Lower Level. CBO lnc. should be notified of any discrepancies or problems with grade elevations of proposed components during installation of the OWTS. *Elevations are based upon standard OWTS installation practices. Component elevations may change during installation due to site conditions. Minimum grade refers to piping between components. The 4-inch diameter Schedule.40 sewer lines exiting the buildings must have a double-sweep clean out and a minimum 2o/o grade to the septic tank. There should be no 9O-degree angles in the sewer lines before the septic tank. The system installation will include a 1S00-gallon, two-compartment Valley Precast concrete septic tank with an Orenco@ Biotube Pump Vault and an Orenco@ PF3005 pump in the second compartment of the septic tank. lf the area of the septic tank will be subject to traffic, the septic tank lid must be traffic rated and traffic rated risers and cast-iron lids utilized. Specifications for these components may be provided upon request. The floats should be set to dose approximately 85 gallons each pump cycle, allowing approximately 10 gallons of drain back. The control panel for the pump must be located within line of sight of the septic tank. We recommend Valley Precast out of Buena Msta be contracted for start-up of the pumping system. T Effluent will be pumped through a 1.S-inch diameter pump line from the pump chamber to an Orenco@ automatic distributing valve (ADV), model 6402. This pump line must have a minimum 1o/o grade for proper drain back into the tank after each pump cycle. The ADV must be placed at a high point in the system in an OWTS Comoonent Minimum Elevation Primary Tank lnlet lnvert Approximate horizontal distance 60' from BuiHing A / min.2o/o fall / min. 15' fall Approximate horizontal distance 9'from Building B / min.2o/o fall / min. 2.25" lall Automatic Distributing Valve Approximate horizontal distance 92'l min. 1% rise / min. 1,l.5" rise lnfiltrative Surface Approximate horizontal distance 11' / min. 1% fall to STA / min. 1.375" fall Min. 58 gal. (12 gal x 4) + 10 gal drain back Dose Range Max = 135 gal. (500 GPD x25o/o + 10 qaldrain back) 10 gallons drain back (92' I 1.5" diameter oumo line) Dose Setting 85 gallons/dose 1 500 gallon 2-compartment Valley Precast concrete septic tank 8.5" on/off float separationFloat Separation 24.4 gallons per minute (GPM)19.1 feet totaldynamic head ffDH) Pump Criteria Page4 insulated riser with access from grade. Screened rock must be placed below the ADV to support the ADV and to assure the clear pipes exiting the ADV remain visible forfuture inspection and maintenance. It is important to note the both the main sewer lines to the septic tank and the pump line will be in areas subject to traffic. Special care should be taken to properly bed these sewer lines to lessen the impact from traffic and compaction of the soils above and below the sewer lines. Sewer lines can be placed in conduit, and/or BlueBoard placed over the pipes to better protect the pipes. We also recommend tracer wire be used to identiff the pipe locations. Effluent will be pressure dosed to through 1.5-inch diameter distribution lines to a 12' x 53' bed. A minimum of 3-feet of sand filter material will be installed in the over-excavated footprint. Sand filter material must be clean, coarse sand, all passing a screen having four meshes to the inch. The sand must have an effective size between 0.15 and 0.60 mm. The uniformity coefficient must be 7.0 or less. Materialmeeting ASTM 33, for concrete sand, with three percent or less fines passing 200 mesh sieve may be used. A gradation of the sand media must be submifted to this office prior to obtaining the sand. Laterals must be 1.5-inches in diameter with 5/32-inch diameter orifices facing down, spaced 3-feet on center, installed on the GeoMatrM with the proprietary gray GeoMatrM filter fabric over the laterals. Laterals should be placed 2-feet from the edges of the bed with 3.0-feet between the laterals connected with a level manifold and 2-feet between the sections. Four 39" wide GeoMatsm must be placed on the 12-foot wide bed. All materialassociated with the GeoMatrM installation must be proprietary products associated with the GeoMatrM, including orifice shields and geotextile fabric. Manufacturer instructions must be followed regarding installation of the GeoMatil. Each 1.5-inch diameter lateral must end in a sweeping ell facing up with a ball valve for flushing. Valves should be placed in a 1O-inch sprinkler box for access. Laterals must be covered by the proprietary gray GoeMatru soil separation fabric and at least 1-foot of topsoil or other suitable soil able to support vegetative growth. There shall be no cobble-sized (>2.5") or greater rock in final cover over the GeoMatrM. lnspection ports must be placed at each corner of the bed. Ports may be cut to grade and covered with a valve box for access. GOMPONENT SPECIFICATIONS The component manufacturers are typical of applications used by contractors and engineers in this area. CBO lnc. must approve alternative components prior to installation of the OWTS. Requests must be submitted, in writing, to our office for approval prior to installation. Component technical data sheets are available upon request. COMPONENT MANUFACTURER MODEL NO.COMMENTS Septic Tank Valley Precast Item # 1500T-2CP-HH 2-compartment concrete septic tank with high head pump Pump Orenco@ PF300511%HP 120 Volt Biotube ProPak Pump Packaoe orenco@ BPP3ODD Vault, Filter, Control Panel [demand dose) Tank Risers and Lids Orenco@ Double-walled PVC Risers and Lids (24" diameter) ADV Orenco@ v6402A 1.5" lnlet and Outlets AIJV Rlser and Lld Orenco@ Double-walled PVC Risers and Lids (30" diameter) Flushing Assembly Orenco@ 1.5" diameter (2) 45" or 90' long sweep only (4 total) Page 5 GeoMatru GeoMatriz@ 212'GeoMatru and 64 Orifice Shields Construction must be according to the jurisdiction's adopted On-Site Wastewater Treatment System Regulations, the OWTS Permit, and this design. PERMIT APPLICATION INSTRUCTIONS An OWTS Permit Application must be submitted to Garfield County Environmental Health Department https://www.qarfield-countv.com/environmental-health/filesqcco/sitesi 16/OWTS-Application-Complete- Packet-Dec.-2019.pdf. lf the OWTS Permit Application will be submitted with a Building Permit Application, it should be submitted directly to Garfield County Building Department. All questions regarding permit submission can be directed to Garfield County Environmental Health Department, 970-945-661 4 x81 50. INSTALLATION CONTRACTOR CBO lnc. expects that the installer be experienced and qualified to perform the scope of work outlined in this design. The installer must review this design thoroughly and coordinate with our office in advance of installation. Any additionalconditions in this design or county permit must be completed and documented prior to final approval of the OWTS installalion. Communication between the installer and this offce is expected throughout the installation. INSTALLATION OBSERVATIONS CBO lnc. 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. CBO lnc. should be notified 48 hours in advance to observe the installation. ln an effort to improve the accuracy of the record drawing, we request that the installer provide a sketch of the installation, including path of the sewer lines, water line installation (if applicable), septic tank location, STA location, and measurements from building corners or another fixed objects on the property. This sketch is most easily provided on Sheet \A2.0 of the OWTS Design Packet. Photographs of the installation and final cover are also requested to supplement our installation documentation. 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 irrigation 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 OWIS shall be responsible for maintaining proper vegetation @ver. OPERATION INFORMATION AND MAINTENANCE The propefi owner shall be responsible for the operation and maintenance of each OWTS servicing the property. The propefi owner is responsible for maintaining service contracts for manufactured units, alternating STAs, and any other components needing maintenance. Page 6 Geo-fabrics or plastics should not be used over the STA. No heavy equipment, machinery, or materials should be placed on the backlilled STA. Machines with tracks (not wheels) should be used during construction of the STA for better weight distribution. LMestock should not graze on the STA. Plumbing fixtures should be checked to ensure that no additionalwater 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. lf an effluent filter or screen has been installed in the OWTS, we recommend this filter or screen be cleaned annually, or as needed. lf the OWTS consists of a pressurized pump system, we recommend the laterals be flushed annually, or as needed. The homeowner should pump the septic tank every two yearc, 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 lf the design includes a pump, 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 the excavation of the STA due to the potentialto 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. LIMITS: The design is based on information submitted. lf soil conditions encountered are different from conditions described in report, CBO lnc. 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, CBO lnc.Reviewed By: (a,'t* }vtbwg '-. 1-16-2023 .: (J L I c 36823 vn* Carla Ostberg, MPH, REHS Romeo A. Baylosis, PE Pump Selection for a Pressurized System - Single Family Residence Proiect 252 CR 167 Parameters 300Discharge Assembly Size Transport Length Bebre Valve Transport Pipe Class Transport Line Size Disffbuting Valvc Model Transport Length After Valve Transport Pipe Class Transport Pipe Size Max Elevation Lift Manifold Length Manifold Pipe Class Manifold Pipe Size Number of Laterals per Cell Lateral Length Lateral Pipe Class Lateral Pipe Size Orilice Size Orifice Spacing Residual Head Flow Meter 'Add-on' Friction Losses Calculations "t.50 92 40 1.50 uo2 11 40 1.50 3 3 40 1.50 4 5t 40 1.50 5t32 3 5 None 0 inches feet inches fiaet inches tset fieet inches tuet inches inches feet feet inches feet oolr IoF doo .9 Eog o .E € 250 200 150 100 50 PumpData 510 15 20 25 Net Discharge (Spm) 30 35 40 Minimum Flow Rate per Orifice Number of Orifices per Zone Total Flow Rate per Zone Number ol Laterals per Zone o/o Flow Difierential lsuLast Orifice Transport Velocity Before Valve Transport Velocity Aft er Valve Frictional Head Losses 0.68 36 24.4 2 1.7 3.9 3.9 gpm gpm o/- fps tss Loss through Discharge Loss in Transport Before Valve Loss through Valve Loss in Transport after Valve Loss in Manifold Loss in Laterals Loss through Flowneter 'Add.on' Friction Losses Pipe Volumes 00 1.8 J.J 5.4 0.4 0.0 o.2 0.0 0.0 gals gals gals gals gals gals feet tuet feet freet feet fieet feet feet Vol ofTransport Line Before Valve Vol of Transport Line Afier Valve Vol of Manifold Vol of Laterals per Zone Total Vol Before Valve Total Vol After Valve )quirements 24.4 19.1 9.7 't.2 0.3 10.8 s.7 't2.3 PF3005 High Head Efiuent Pump 30 GPM, .I/2HP '1151230V 10 60H2,200Y 3A 60{z PF3007 High Head Effiuent Pump 30 GPM, 3/4HP 23oY 16 60Hz,2ool46ov 3A 6oqz PF3010 High Head Efluent Pump 30 GPM, 1HP 23oV 1g 60Hz',2oo/46ov 3Q SOHZ PF3015 High Head Efruent Pump 30 GPM, t-1l2HP 230V 1O 60H2, 2o0l23ol46ov 3A 6oH.z gpm ieet :;k',$ I l I System Curve:- Pump Curve: * Pump Optimal Range:- Operating Point: o Design Point: E N SCALE: 1 = 50'=0" THE LOCATION OF PROPOSED IMPROVEMENTS SHOWN ARE NOT THE RESULT OF A PROPERry SURVEY, THE LOCATIONS ARE APPROXIMATE. IT IS THE HOMEOWNERS' DUTY TO ENSURE ALL CONSTRUCTION AND IMPROVEMENT LOCATIONS ARE ACCURATE. PROPERTY LINES AND SETBACK DISTANCES SHOULD BE CONFIRMED PRIOR TO EXCAVATION. SCALED FOR PRINTING ON 1 1" X 1 7" PAPER. w1 .0 c\BR \q{*sqR= Es (s E:.o I 1 DRAWINGS MUST BE USED IN CONJUNCTION WITH DESIGN LETTER DATED 121 1612022 Gd3 Ed!6mcnt bk 890, ps 568 100.0'El€ctrlc bk 321, ps 235 Ed!.m!nt 20.0' lngr6ss-E9r@ EdEmont Roklch to T.rllomls bk 1007, p9 47 cor Eom.nt bk 890, pg 568 ud.@ s 12'49'18" E 26.32' STAE.Y-5974.13' 30.0' Holy Croa R6c. No. 10,0' Wot6rlln. Eoemrnt d9 bullt dnd ln Ploc6 oB showh on Amddmst to th6 Roklch Exmptlon Porc.i'A' ond tJd 131.0' BUILDING B SEpTtC BUILDI TANK A NG A TY Wrll ond Wot.riln€ Eo$mcnt Rcc, No, 370537 i2,4' U) 10.0'{ld. q oo 9t.5' 20.9' .u , I s Rec' APPROXIMATE W f n3' +1 LOCATION Dale:1211612022 Designed by: CBO Reviewed by: RB Drawn by: DD CBO lnc. 129 Cains Lane Carbondale, Colorado 81623 Phone 970.309.5259 carla.ostberg@gmail.com 252 CR 167 Garfield County, Colorado Project Number: C1779 South lnca Holdings LLC a SITE PLAN Sheet 1 0F 4 NOTE: OWTS COMPONENTS SUBJECT TO TRAFFIC MUST BE TRAFFIC-RATED, INCLUDING THE SEPTIC TANK, RISERS, AND LIDS, IF APPLICABLE. NO TRAFFIC OR STAGING IS ALLOWED IN THE STA. THIS AREA MUST BE FENCED OR OTHERWISE PROTECTED FROM VEHICLE TRAFFIC..f\ t, -, , ry', ) P.O.B '-l ,:L' 1sOO-GALLON 2-COMPARTMENT SEPTIC TANK WITH AN ORENCO PUMP PACKAGE IN THE SECOND COMPARTMENT, RISERS AND LIDS TO GRADE \ \ \ \t\ 10 0' wirtc 4' DIA SCH-40 SEWER LINES FROM BUILDINGS WITH DOUBLE-SWEEP CLEANOUTS (MrN 2% FALL TO TANK) NO 90 DEGREE ANGLES. Li --\\ \ \S z1 Atr.z-7 STING SEPTIC TANK TO BE ABANDONED 12.4' ---ecb\e- STING GAS LINE h \\s\i R Natn ss.v) .a \o!rq\q \ I .l 1 BUILDING A FF 5977.25' SCALE: 1" = 20'-0" \g 6o \1 \BUILDING B BM=100' FF -5978'TO \ i \ w2.0 tn c0_ F-) F N-G IN ;8 ROPERTY LINE 1.5- DIA SCH-40 LEVEL MANIFOLD C ADV MODEL6402 AT HIGH POINT, ACCESSIBLE AT GRADE 12' x 53' PRESSURE DOSED, OVER-EXCAVATED, UNL|NED SAND FTLTERS (MtN. 3'ASTM C-33 coNcRETE SAND) W|TH FOUR 39" GEOMAT SHEETS ON BED (4) 1.5' DtA SCH-40 PVC LATERALS w#" DtA oRtFtcES FActNG DowN, 3' O.C., COVERED WITH ORIFICE SHIELDS ent to the Porcel "A" Ad justment 834 I osement Ploce os o 1 10' \..J(tl -{E L M EXISTING SEPTIC TAN 1.5'' DIA SCH-40 PUMP LINE 1.5' DIA SCH-40 PVC DISTRIBUTION FLUSHING VALVE AT END OF EACH LATERAL, \e- l\ TO BE ABANDONED Elev?55974.1 (MrN 1% R|SE FOR DRA|N BACK TO TANK) WATERLINE EASEMENT LINES TO EACH MANIFOLD Holy Cross Eosement --f Rec. No. 787618 INSPECTION PORT AT EACH CORNER OF BED MIN TO \ do6 6 \ >- c Lid 3" 2023 ADDITION MAIN LEVEL ----qo oo 1 TO LL 252 CR 167 Garfield County, Colorado Project Number: C1779 South lnca Holdings LLC Dale:1211612022 Designed by: CBO Reviewed by: RB Drawn by: DD CBO lnc. 129 Cains Lane Carbondale, Colorado 81623 Phone 970.309.5259 carla.ostberg@gmail.com 131.0' PROPOSED OWTS Sheet 2 0F 4 END EACH LATERAL IN A 90' LONG SWEEPING ELL FACING UP WITH A BALL VALVE IN A VALVE BOX ACCESSIBLE AT GRADE 1.5'' DIA SCH.4O PVC LATERALS WITH 5/32'' DIA ORIFICES FACING DOWN AT 3'O.C. ON GEOMAT 1.5" DIA SCH-40 PVC PUMP LINE FROM TANK (MtN. 1% DRATN BACK TO PUMP CHAMBER) ADV MODEL 6402 AT HIGH POINT, ACCESSIBLE AT GRADE 1.5' DtA SCH-40 PVC DISTRIBUTION LINE TO EACH SECTION 1.5' DIA SCH-40 LEVEL MANIFOLD INSPECTION PORT AT EACH CORNER, OUTSIDE OF LATERALS 30- DIAMETER PVC RrsER (TNSULA 12" MIN FROM EFFLUENT PUMPING SYSTEM AUTOMATIC DISTRIBUTING VALVE ASSEMBLY 1.5' DtA SCH-40 PVC INLET AND OUTLETS FOUR SHEETS OF GEOMAT (EACH 39")ON BED 1.5' DIA SCH.4O PVC LATERALS WITH 5/32- DIA ORIFICES FACING DOWN AT 3'O.C. ON GEOMAT SAND FILTER MATERIAL 'SECONDARY SAND' EFFECTIVE SIZE = 0.15 - 0.06 mm UNI FOR[,4ITY COEFFICIENT <7.0 % F|NES PASSTNG #200 STEVE s3.0 STA PLAN FICE SHIELDS F ILTER FABRIC T 5 INSPECTION PORT AT EACH CORNER GRADE MI TOPSOIL COVER M OVER.EXCAVATE APPROX.4'6" BELOW NATIVE GRADE AND FILL WITH MIN.3'SAND FILTER MATERIAL NG VALVE DETAIL w3.0CBO lnc. 129 Cains Lane Carbondale, Colorado 81623 Phone 970.309.5259 carla.ostberg@gmail.com 252 CR 167 Garfield County, Colorado Project Number: C1779 lDate:1211 lo"rign"o lReviewed lorawn ov: 6t2022 by: CBO by: RB DD South lnca Holdings LLC Sheet 3 0F 4 DESIGN BUILDING A 6 EMPLOYEES x 15 GPD = 90 GPD BUILDING B 6 EMPOLYEES x 15 GPD = 90 GPD 2 BEDROOM APT x2 PEOPLE/BEDRROOM x 75 GPD = 300 GPD WASTEWATER FLOW = 90 GPD + 90 GPD + 3OO GPD = 480 GPD USING DESIGN FLOW OF 5OO GPD TANK: MIN. lOOO GALLONS USE 1sOO-GALLON, TWO-COMPARTMENT CONCRETE SEPTIC TANK WITH ORENCO PUMPING SYSTEM IN SECOND COMPARTMENT SOIL TREATMENT AREA (STA): LONG TERM ACCEPTANCE RATE (LTAR) = 0.8 GAL/ SF CALCULATED STA = Q/LTAR = 500 / 0.8 = 625 SF 1 2' x 53' PRESSU RE-DOSED, OVER-EXCAVATED, U NLI NED SAN D FILTER WITH MIN. 3'SAND FILTER MATERIAL UNDER GEOMAT FINISHED GRADE 24" MtN. 4'' DIA SDR-35 SEWER LINE (MrN 2% SLOPE TO TANK) SCREENED ROCK OR SAND FOR BEDDING 3" MIN 8" MtN TRENCH DET SLIP-ON PVC DO NOT GLUE INSULATED COPPE TRACER WIRE 4" DtA SEWER LINE FINISHED GRADE TO HOUSE SLIP-ON PVC CAP DO NOT GLUE 4'DIA INSPECTION PIPE STA FI MEDIATO TANK+ FI 1O' DIA VALVE BOX WITH SECURED LID 1.5' PVC SLIP X MALE PIPE THREAD ADAPTER WCAP 1.5" DIA BALL VALVE 1,5'DIA SCH-40 PVC LONG SWEEP 90'ELBOW GEOMAT 1.5" DIA SCH-40 PVC LATERAL INSTALL FLUSHING VALVE ECCENTRIC TO CENTER OF VALVE BOX w4.0 SPRINKLER VALVE BOXAT GRADE FINISHED GRADE 114" DIA HOLE DRILLED INTO TWO SIDES OF PIPE FOR VENTILATION (BELOW SL|P ON CAP) DETAIL BACKFILL L 252 CR 167 Garfield County, Colorado Project Number: C1779 South lnca Holdings LLC Dale:1211612022 Designed by:CBO Reviewed by: RB Drawn by: DD CBO lnc. 129 Cains Lane Carbondale, Colorado 81623 Phone 970.309.5259 carla.ostberg@gmail.com Sheet 4 OF 4