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Home My WebLink AboutSubsurface Investigation & OWTS Design 07.21.15Sr'ø lJarzJ P*ø >ü Ñln< 7Í) ,i ,,.1 iV" Rtt $ttrffi[ 33 Four Wheel Drive Rd Corbondolo C0 8ló23 970-309-5259 July 21,2015 Project No. C1084 Eagle Springs Organic Ken Sack kensack@me.com Subsurface lnvestigation and Onsite Wastewater Treatment System Design Slaughterhouse (revised) 482 CR 315 Garfield County, Colorado Ken, ALL SERVICE septic, LLC performed a subsurface investigation and completed an onsite wastewater treatment system (OWTS) designs dated September 15, 2014, January 26, 2015, and June 17, 2015 for the subject property where a slaughterhouse is proposed. All previous design documents should be discarded are replaced with design documents dated July 21,2015. The property is located outside of Rifle, in an area where OWTSs and wells are necessary. SITE CONDITIONS A commercialwarehouse presently exists. A single-family residence, served by an existing OWTS, also exists on the property. The existing OWTS serving the single-family residence was not addressed in this design and was not inspected by this office. A Norwesco@ poly septic tank was partially installed, but never connected to either structure. A well and cistern currently serve the property. These are located greater than 100-feet from the proposed soil treatment areas (STAs). An additional cistern, located on the site plan provided by High Country Engineering, is currently located within the proposed STA that will serve the butchering room and must be removed. Any ditches must be setback at least 5O-feet from the proposed STAs or may be lined or placed in a culvert if the setback is not able to be met. No component of the proposed OWTSs can come within 10-feet of any property line. SUBSURFACE The subsurface was investigated on August 6,2014 by digging two B-foot soil profile test pit excavations (Test Pits) and taking a soil sample from approximately 3 to 3.S-feet below grade in Test Pit #1. A gradation analysis was run by HP Geotech and results are detailed in a report dated August29,2014, Job No 114 021R. The materials encountered in the Test Pit #1 consisted of brown, dense, moist, topsoil, underlain by light tan, moist, dense silty, clayey, sand to a maximum depth explored of 8.0-feet. This horizon had a blocky structure shape, strong structure grade, and firm consistence. No bedrock or groundwater was encountered. Page2 The materials encountered in Test Pit #2 were consistent with those encountered with Test P¡t #1, explored to a maximum depth of 7.O-feet. No bedrock or groundwater was encountered. The gradation and hydrometer analysis performed by HP Geotech shows the soil consists of 0% gravel, 52o/o sand,27o/o silt, and 21o/o clay. The USDA soil type is classified as Sandy Clay Loam. A long term acceptance rate (LTAR) of 0.35 gallons per square foot will be used to design the OWTS, in accordance with Table 10-l Soil Type 3 presented in the Garfield Gounty On-Site Wastewater Treatment System Regulations, adopted April 14,2O14. Test Pits observed August 6,2014 Test Pit #1 Test Pit #2 Page 3 DESIGN SPECIFICATIONS The plumbing from the commercial building will be diverted to three separate waste streams; (1) floor drains and plumbing associated with the kill room, (2) plumbing associated with restrooms and sinks for employee use outside of the kill and butchering rooms, and (3) floor drains and plumbing associated with the butchering room ù Any floor drains or plumbing from the "kill room" must be collected in a vault and hauled, as needed. No OWTS has been designed for this portion of (f ) K¡llRoom -lþl¡ ttt+Ð fl*, S"t 77L4t (2) Employee Restroom OWTS - Design of this OWTS is based on wastewater flow from an A utility sink will also be utilized. Three employees are anticipated Wastewater Flow = Q = estimated 1OO-gallons Minimum tank size = 1O0O-gallons Sandy Clay Loam = 0.35 gallons/square foot 100 / 0.35 = 286 square feet 286 square feet x 1.0 (gravity trenches) x 0.7 (chambers) = 200 square feet The exrsfing 1250-gallon Norwesco@ poly, two-compartment septic tank may be utilized; however, installation of this septic tank and conditions of installation were not observed by this office. A new, minimum 10O0-gallon, two-compartment septic tank may be considered. A clean-out must be installed on the new 4-inch diameter SDR 35 sewer pipe and must have a minimum 2% fall from the structure to the septic tank. lnlet and outlet tees must be installed in the septic tank, if not already existing. An effluent filter must be placed on the outlet tee of the septic tank. Backfill around the tank and risers must be completed, leaving manhole lids accessible from grade. Effluent will gravity flow from the septic tank with a minimum 1o/o fall to a distribution box, accessible from grade, and then to two rows of 10 'Quick 4' lnfiltrator@ chambers for a total of 20 chambers and 240 square feet of infiltrative area. Trenches must be over-excavated 2-tÍeet below the infiltrative area and re- compacted in 1-foot lifts. lnspection ports must be installed on the beginning and end of each trench. These may be cut to grade and covered with a valve box for access. (3) Butchering Room OWTS d A/wF&-Tt"F'lz ls Design of this OWTS is based on wastewater flow from and sink(s) butchering room. We strongly recommend screens on all floor drains. Use of quaternary ammonia is prohibited with this the slauohterhouse. tl""-, ilyÞ treatment system. We suggest using chlorine-base(sanitizers. N,sz fr Èqæ oF ¡Jnzt Bøu}tîq' 7& T;r's ?*z oç 0 Page 4 Wastewater Flow = Q = estimated 300 GPD Minimum tank size = 1OOO-gallons Sandy Clay Loam = 0.35 gallons/square foot 300 / 0.35 = 857 SF x 0.8 (pressure dosed trenches) x 0.7 (chambers) = 480 SF A 1O0O-gallon, two-compartment septic tank with an Orenco@ PF3005 timed dose pump in a Biotube pump vault will be installed in the second compartment. Timed dosing should be set to micro-dose 50 gallons per dose every 2 hours into the septic tank with the MicroFASTrM system. A 1500-gallon, two- compartment septic tank housing a 0.5 MicroFASTrM will follow the primary tank, followed by a 500- gallon dosing chamber with an Orenco@ PF3005 demand dose pump in a Biotube pump vault. Floats should be set to dose approximately 95 gallons to the pressurized STA. Other pumps may be considered, but must be able to attain 6 gallons per minute and 10 feet of total dynamic head. Control panels for the pumps and MicroFASTrM must be located within line of sight of the septic tanks. The proposed treatment is designed to treat 400 mg/L Biochemical Oxygen Demand (BOD) influent at 300 GPD. We recommend monitoring actual flows into the OWTS in addition to sampling the wastewater strength to assure the treatment sequence is appropriate for the wastewater exiting the butchering room. Effluent will be pressure dosed through a 1.2S-inch diameter schedule 40 pipe to an Orenco@ Model 6404 automatic distributing valve (ADV) and then to four gravelless chamber trenches consisting of 10 'Quick4' lnfiltrator@ chambers in each trench. The ADV must be located at a HIGHER elevation than the discharge pump and must be accessible from grade. The trenches must be over-excavated 2-feet belowthe infiltrative area and re-compacted in 1-foot lifts. Zip tieswill be used to hang 1.25-inch laterals to the underside of the chambers. The 1.25ìnch laterals w¡ll fravqæ1nch orifice hóles facing UP (with the first and last holes facing down for drainage), 3-feet on centersYach lateral must end in ã 90 degree sweeping ell facing up with a ball valve for flushing in a valve box, accessible from grade. These may be cut to grade and covered with a valve box for access. STAs and OWTS components should be protected from any vehicle, equipment, or livestock traffic. Heavy equipment and livestock can cause damage to underground piping. 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. 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 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. Page 5 OPERATION INFORMATION AND MAINTENANCE The property owner shall be responsible for the operation and maintenance of each OWTS servicing the fi.\Á-\ J úJ property. The property owner is responsible for maintaining scryiqe contracts alternating STAs, and any other components needing maintenance. for manufactured u u)ÉÐ Geo-fabrics or plastics should not be used over the STA. No heavy equipment, machinery, or materials should be placed on backfilled STA. 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 ¿¡scnffiã-ìñG 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 qomesflc wasle ontv.---- MicroFASTrM TREATMENT SYSTEM The burial depth of the tank should be 12 to 24 inches. A 110 or220 volt,20 amp dedicated breaker is required for the blower. The MicroFASTrM System must be installed by a qualified installer. The control panel should be mounted in 'line of sight' of the system. Two site visits are typical for a MicroFASTrM installation. The first visit is to install the MicroFASTrM unit and the second visit is the 'start-up' visit. MicroFASTrM treatment systems. and maintenance contract is ired for ADDITIONAL CONSTRUCTION NOTES lf 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 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. lf 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. Page 6 Please call with questions. Sincerely, ALL SERVICE septic, LLC Reviewed By: (ß),b }vtb'rNg s$\ Richard H. Carla Ostberg, MPH, REHS Liability Glause: lJnder no circumstances whatsoever shall the liability of ALL SERVICE septic, LLC, in connection with any contract, directly or indircctly, exceed the total amount paid by the client to ALL SERVICE septic, LLC for the servrbes and/or goods which are the subject of the contnct in connection with which the liability arises. gaee¿ 33 Four Wheel Drive RoadCarbondale, Colorado 8l 623Phone 970.309.5259ærla@allsery¡Gept¡c.æmfiil.Afitil1[t{dilLll// l{r'/ -.¿.-I\z'-\\ t .z/**-'<' / /\./ /(()\IIII)((-"'--I'(\:r\i\fl)Iì¡ì:l.¿r -.-7:r//.- J \(ifr Ê LOCATION OF EXFTNG ND PROPOSED IMPROVEMEMS SHOM AREBÆED ON SURW ¡NiffiTON PROUDED BY HIGH COUNRYENGINEERING, INC. IT IS ßE PROPERT OMERS DUW TO ENSURE ruCNSNUflON NO IMPROVEMENT LOATONS ARE ACCUMTE. A[SETilCK DISTNCES SHOULD BE CflFIRMED PRIOR TO qqVATON.DRAWINGS MUST BE USED INCONJUNCTION WITH DESIGNLETTER DATED JULY 21,2015Eagle Springs Organic482 CR 315Garfi eld County, CdoEdoPþject Number: C1084w1.0Ð?dte: 07121115 Ioes¡sneo sv' ANolReviewed By: RHPIDEwn By: ANG ISheet 1 of 7 Eagle Springs Organic482 CR 315Garfi eld County, ColoEdoPþject Number: C1084Da¡e: 07121115 IOr"¡gn.O gv: nNelReviewed By: RHPIDmwn Bv:ANG ISheet 2 of 7w2.0N/¡/SINGLE.540/ATOFI'REMOVE THElex¡sn¡¡e,/ ctsrERN.INANDOFEACHTANKSEPTIC0' 20, I 40Sæle: 1'=l4o'{'.{o rRÂFøc oRORANDr 25' DtAPROV¡DE MIN 1AND't.2î4'v8¡3'ANDHOLEEFD OFLINEPIPE{IBACK TOAIçÀD EACHDEêREE FI IA BALLINcoIfARTMEt'¡T PUÀrPTANK wlTH 'ORENCOprsóos oeM¡¡lo DosePUUPIIlSLOPE'"]'i',l(BUTCHERING ROOMDESIGNED FLOW = 300 GAL/DAYTANK:300 x 4E HOUR RETENTION TIME = 600 GALLONSUSE IOOO-GALLON, TWO€OMPARTMENT TANKWITH TIMED DOSE PUMP1 5OGGALLON, TWO-COMPARTMENT TANK WTH0.5 MICROFAST SYSTEMsOO.GALLON DOSING CHAMBER WTH DEMANDPUMPsotL TREATMENT AREA (STA):LONG TERM ACCEPTANCE RATE (LTAR) = 0.35GAU SO FTPRESSURE DOSED, CHAMBER TRENCHESTOTAL AREA REQUIRED = 480 SF4 ROWS OF IO 'QUICK 4' CHAMBERSì(,/(-t4¡t1t ..l¡II\ì\ \\\firrA$Itrffil{l¡l¡f33 Four Wheel Drive RoadCarbondale, Colorado 81 623Phone 970.309.5259€da@dlseru¡Gept¡c.æm\TANKCOR Eagle Springs Organic482 CR 315Garñêld County, ColoãdoPrcj€ct Number: C1084Ðalei O7n1n5 IIDesisneo ay: ANGI W3.0Reviewed By: RHPIDEwnBy:ANG I Sheet3ofTCHAMBER TRENCH CROSS SECTION - TYP.CUTPVCSMALL VALVE COVERBOX OR IRRIGATIÕNVALVE BOX AT GRADEOBERVAI¡ONPIPEPVCCAP OR THREADEDIOBERVATIONPIPECLEANOUT ASSEMBLY3.5'sotLCOMPACTBASE TO SUPPORTBOX4' PVC PIPE CUT TOFITt2'EXCAVATIONDtA SCH 4f)LINES TO ENTERAND EXIT IN TOPUSE HOLE SAW TOCUT THRUTOPOFSUSPENDED LATERAT WTH1/8" DIA ORIFICE HOLESFACING UPATSO.C.WTHONE HOLE FACING DOWNAT THE ÊND OF THE LINEFOR DRAINAGE. LINES MUSTEND IN A 90 DEGREE ELLwlTH A BALL VALVE FACINGUP IN AVALVE BOXACCESSIBLE AT GRADEPORT OFENDENDSCARIFYGRAVELLESSCHAMBÊR (4'x 3)2' OVER-EXCAVATION,RE-COMPACTED IN 1' LIFTSPLAN VIEW - TYP,GRAVELLESS 'OUICK4'INF¡LTR,ATOREND PTATECHAMBER (4 x 3)BALLIO" DIAVALVE BOXINSPECTION PORT IN END CAPAT6'SVVEEPING ELLBEGINNING AND END OF EACH ÍRENCHEND EACH LATERAL IN A 90DEGREE ELBOW FACING UPWITH A BALL VALVE IN AVALVE BOX ACCESSIBLE ATGRADE1.25'EFFLUENT PIPEFROM SEPTIC TANK\ ¡ovl¡ooelo¿o¿rrLn¡en ponrtPLACED INTOP PORT OFCHAMBER ENDPLATES33 Four Wheel Drive RoadCarbondale, ColoEdo 81 623Phone 970.309.5259carla@allseryiGeplic.æm1O CHAMBERS PER TRENCHflrra$Inilff{¡ilts