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HomeMy WebLinkAboutOWTS Installation Observations and DesignDate; CαENG音NEERING l129"24"Road c青OnkConsfr〃cfhrh〇・　　　GrandJunction,CO815O5 springs/Aspen(970)640-5029.￣而ontrose/Delta(970)640-5029 -喜一i==一一一一書臆　喜一-臆臆音臆臆臆=臆=臆==〇〇〇〇〇〇〇二〇音=臆臆=〇二〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇・〇〇〇音￣　〇一二音=音"----i∴ 245_0577・Glenwood Fax:(970)257-7453.Ema旺ccigj@msn.com oNSITEWASTEWATERTREÅTMENTSYSTEMDESIGN Preparedby: August17,2018 ThomasA.Cronk,P.E. CronkConstructionInc. 1129-24-Road GrandJunction,CO81505 245-0577 TypeofDesign:　reSidentialrepalr Client:　　　　　CarlosSanchez llOWestMainStreet Silt,CO81652 970-379-9166 塑塑hezcarlo?22旦@gmail・C哩 Propertyaddress:　3125Highway13’Rifle’CO81650 TaxscheduleNo∴　2129-364-00-001 LegalDescript∴ Thesiteconsistsofapproximately7.62acresofuncultivatednativesoil・Draillageisapproximately3% tothesouthwest.Apercolationtesusoilsevaluationwasconductedonthepropertyofreferenceon o8/04/18byTomA.Cronk,registeredprofessionalengineer(R.P・E.)・Thepercexcavationtrench (excavationA)wasIocatedapproximately165-southofthenofthpropertylineandapproximately325’ westoftheeastpropertyline.Additionalpercholeswerelocated30'southofthetrench(excavationB) and35-s。utheastofthetrench(excavationC)・ Thesitecurrentlycontainsa3bedroomhomeand3bedroomalternatedwellingunit(ADU)・Anexisting onsitewastewatertreatmentSyStem(OWTS)currentlyprovides.sewagetreatmentforbotllOfthe residences.TheexistingOWTSissIowdrainlngandshowingslgnSOffailureandtheownerswishto installarepairOWTStoservetheproperty.TheO8/04/18siteinvestigationwasconductedtoprovide subsurfacedesignparametersforanonsitewastewatertreatmentSyStem(OWTS)toservethesite. BasedonresultsfromtheO8/04/18siteinvestigations,anenglneeredOWTSdesignhasbeenpreparedfor theproperty.AdiscussionofdevelopedsubsurfacedesignparametersandtheengineeredOWTSdesign 制ows.ThesitelayoutandlocatienoftheO8/04/18perctest/soilsevaluationsareshownontheattached pIotplan.ResultsoftheperctesusoilsevaluationsareattachedforreferenceasAppendixA・ 璃劇団田圃霊園扇面田圃歴蛭田田圃田園田圃 Asoilsobservationexcavationwasextendedtoadepthof96一一belowgroundsurface(BGS)・Therewas noevidenceofgroundwaterorhighseasonalwatertableintheopenexcavationtoadepthof96一一BGS. Thesoilsevaluatienindicatesonedistinctso冊orizonunderliesthesite.AlithoIoglCaldescriptlOn fbllows: 垣生色豊∴昼型出盛 0・,-96”　sandyloam(USDA-10amySand,Singlegrained,StruCtureless) AsbasedontheresultsfromtheO8/04/18siteinvestigations(AppendixA)’adesignpercrateof13 min/in.andcorrespondinglongtermacceptancerate(LTAR)ofO.80arechosenforoverallsystemsizing foranin皿atortrenchabsorptionfielddesignedtodischargetosubsoilsbelowthe48一一depth・ i』SystemDesig± An刷f朋R47ORabsorptlOntrenChisproposedfordischargeofsepticef皿entatthesite.Construction ofthesystemwillconsistofexcavatlngleveltrenchesintheareacomprlSlngtheabsorptionfield・As shownintheattachedseptlClayoutplan,thetrencheswillbeorientedperpendiculartothenaturalsIopeto minimizethedepthofexcavationalongthetrenchlength.Eachtrenchexcavationshallbecontinuedtoa maximumdepthof48一・BGSattheuphillsideofthetrench(Seeabsorptionfieldcross-SeCtion)・After removalofsurfacesoils,theopenexcavationswillbediskedorscarifiedtopromotesubsurface absorptlOn. Followingcompletionoftheinitialpush-OutS,QUTCK4STAN舶RD棚Hm4710RSwillbeusedto constructasepticeffluentdistributionsystemintheopenexcavations・The雅兄TRA710Reffluent distributionsystemwillbeinstalledinaccordancewiththe一一I皿tratorTechnicalManual一一,aVailablefrom InfiltratorSystemsInc・,123ElmStreet・Suite12,OldSaybr0Ok’ConnecticutO6475.A句acent 踊FJZ,R雄10RSshallbefastenedwithaminimumoffour(4)3′4一一x#8se皿appingsheetmetalorbright brassdeckscrewstopreventmOVementandseparationduringback細ng. septiceffluentwillbetransferredfromtheuppertrenchtoeachofthea句acentdownh冊enchesthrough aserialdistributionnetworkasshownintheattachedconstructiondetails.Theserialdistribution connectionsbetweena専CenttrenCheswillfacilitatethesaturationoftheuphilltrenchbeforeseptic 。珊u。ntis。11。W。dt。fl。Wt。eaChofthea句acentdownhilltrenches.Asshownintheattached AbsorptionFieldCrossSection’thebottomoftheS桝N。ARDIN雅舶ATO2seepagetrencheswillbe locatedamaximumof48一一belowgroundlevel. Aft。.th。INF比T朋A倣Sareinstalled,Syntheticfilterfabric(140-200mesh)willbeplacedoyerthe trenchesandthesystemwillbecoveredwithasoilcap.Thesoi-capwillconsistof36一一ofnatlVeSOil back皿Thesoilcapwillbemounded5%abovetheexistlnggrOundsurfacetopromotesurfacerunoff awayfromtheabsorptionfields. Theinstallershouldconfirmthefrosibilityofgravitydischargeofsewagee鮒uentfromtheexisting septictanktotheabsorptionfieldbyfieldverificationofassumeddesignparameters.Assumeddesign parameterswithrespecttogravitydischargeinclude: ●　distancefromthesewagepIPeateXitfromthefoundationtotheabsorptionfield-100-or less, ●　elevationofthegroundsurfaceatentrytotheabsorptionfieldshallbenomorethan18" abovetheinvertelevationofthesewagepipeatexitfromthefoundationline. IffieldmeasurementsdonotconfirmthesedesignassumptlOnS,graVitydischargeofseptice冊uentfrom theproposedstructurecannotbeassuredandaliftstationmayberequired.Pleasecontactthedesign englneertOaddressanydesignlnOdificationsnecessaryifthesedesignassumptlOnSarenOtuPheld. Theinsta=ermustalsoconfirmthesetbacksfromproperty血es,buildingenvelopes,andexisting easementsshownintheattachedgraphicsarelnaintained.Fourinchcleanoutssha11beprovidedat maximum100-intervalsina=e鮒uentlinesexceedinglOO-inlength・Vehicletra珊candparkingistobe preventedovertheabsorptlOnandrepalrarea.Provideminimumschedule40PVCunderalltra飾careas・ Additionally,e鮒uentpIPlnglntra珊careaswithlessthan36一一ofcoversha11beencasedin6一一CMPor3 flow制andcoveredwithminimum2"highdensityblueboardinsulation.Fina11y’anyunknownutility lines,eaSementS,OrOtheradverseconditionsdiscIosedduringconstructionmustmaintaintherequired setbackslistedonpage5ofthisdocument. A2,000gallon’tWOCOmPa血ent,COnCreteSePtlCtankwillbeusedtoprovideaminimumof48hours retentiontimeforsewagegeneratedfromtheexistingsixbedroomloading.Alternatively,al,000gallon tankmaybeplacedinserieswiththeexistingl,000gallontanktoachievetherequiredretentioncapacity Theinteriorba鮒emustberemovedfromthefirsttankinseriesiftwotanksareused.Anon-COrrOdible orencofilter(model#FTWO444-36)shallbeinstalledatthefinaloutletteeoftheseptictank/tanksorin thee鮒uentlinebetweentheseptlCtank/tanksandtheabsorptionfieldtolimitthesizeofsolidsand sludgepasslnglntOtheabsorptionfield・The輔ermustbeaccessibleforcleanlngandreplacementfrom thegroundsurface・TheexistlngSOiltreatmentareawillbeabandonedinplace. Asdiscussedabove,I楯〃T鎚TORabsorptlOntrenChesareproposedtodischargeseptice鮒uenttotlle underlyingsub-SOils.Asshownintheattachedgraphics’theabsorptiontrencheswi11consistoffour(4) trenches3-widex48”deepx68-longwithseventeen(17)STANDARD硯7JLTR‘47’OR(Orequivalent) unitseachforatotalofsixtyeight(68)units.Theabsorptionfieldwillencompassaneffectiveareaof l165.71sq.什 calculationsanddesignparametersusedtosizetheabsorptionfieldfo11ow. DESIGNCALCULATIONS DESIGNLOADINGRATEOF6BEDROOMSx150GAL・/BEDROOM-DAY=900GAL./DAY DESIGNPERCOLATIONRATE=13MIN./INCH DESIGNLONGTERMACCEPTANCERATE(LTAR)=0.80GAL・/DAY-SQ.FT. A=霊,WHERE’ A=ABSORPTIONFIELDAREA(SQ.FT・) Q=DESIGNFLOW(GAL./DAY) LTAR=LONGTERMACCEPTANCERATE(GAL・/DAY-SQ.FT・) A二器=112与 ABSORPTIONFIELDAREAADJUSTMENTFACTORFORGRAVITYTRENCHDES量GN=1.O ABSORPTIONFIELDAREAADJUSTMENTFACTORFORUSEOFCHAMBERS=0.7 ADJUSTEDABSORPT量ONF肥LDAREA=1125Xl.OXO.7=787.50SQ・FT・ USE68QUICK4STANDARDENFILTRATORSAS4TRENCHESOF17UNITSEACH CONF萱GUREDINSERIALDISTRIBUTION ABSORPTIONFIELDADDITIONS賞ZEDAT4TRENCHES3FT.X68FT二816SQ・FT・4 田圃田圃団鹿田覆田圃間国限鹿田園田団的匝圃圏 TheownerandsystemcontractorShallbeawareandcomplywiththefollowlnginstallationandsystem OPerationrequlrementS. 生⊥世塵坦逆亜雌 ●　ThesystemcontractormuStbeapprovedandlicensedbyGarfieldCountyforinsta冊onof onsitewastewatertreatmentSyStemS.●箋護警護萱警護蓋警護豊 addressancontactedtoineerwillbeactivitiesw掴 andthedesi ●Insta皿onproceduresincludinggrade,1ocation,Setbacks,SePtictanksize’andabsorption fieldsizeshallconformwiththeattachedgraphicdetails.Constructionactivitiesandsystem componentswillnotencroachuponexistlngeaSementSOrutilitycorridors.Aminimumof6 宜ofundisturbedsoilshallbemaintainedbetweenindividualabsorptlOnelementsandthe septictankand/ora句acentabso申Onelements.Minimumsitespecificsetbacksforsystem COmPOnentSare: Source domesticwaterline domesticwe11 domesticwatercistem propertylines unoccupiedstructure occupiedstructure ir「igationditch 叩en lntem沌ent血1gation gated 宣皇国CTa畦 10- 50- 50- 10’ 5- 101 50I lO’ 10- solidpipe/lined lO' 坐もsorptionField 25I lOOI lOOI lO- 5I 20’ 50’ 25- 25’ 10- BuildingSe哩 101 ●　ToavoidsurfaceflowinfiltrationandsaturationofthenewabsorptlOnSyStem,abandonment ofirrigationinthevicinityofthedisposalsystemisrequired・Diversionditchesnecessaryto divertsurfaceflowsaroundthenewabsorptionbedmustmaintaintheminimumsetbacks .Allgravityflowsewerlinesande肌entdistributionpipingshallbe4inchesindiameterand havegluedjoints.A旧inesdischargingsewagefromtheresidencetotheseptictankshall maintainfa11ofbetweenl/8in.andl/4in・Perfootandsha=empIoysweep90-sor2-45-sat alltums.Sewerlinesfromthedwellingtotheseptictankandatleast6ftfromtheseptic tankoutletmustmeetminimumstandardASTM-3034・Sewerlinesunderdrivewaysshall alwaysmeetminimumSchedule40PVCstandards・Additionally’e珊uentpIPlngintra鮒c areaswithlessthan36"ofcovershal⊥beencasedin6一一CMPorflow剛andcoveredwith minimum2一一highdensityblueboardinsulation.5 .AminimumoflO一一ofsoilcover(18一'recommended)shallbemaintainedoverallgravity drainingISDScomponentstopreVentfreezingofseptice肌ent(exceptingseptictankaccess portswhichmustbeextendedtothegroundsurface)・ ●　TheinstallershallnotplacetheIn皿atorsintheopenexcavationuntilinspectedand approvedbythedesignenglneer.Additionally,thefinalcovershallnotbeplacedonsewer lines,SePtictank,OrtheabsorptlOnareauntilthesystemhasbeeninspectedandapprovedby thedesignenglneer.Theinstal-e「shallprovide48hournoticeforallrequiredinspections・ ●　FourinchcleanoutsshallbeinstalledatmaximumlOO-intervalsinallgravityflowe珊uent linesexceedinglOO-inlength. .Anon_COrrOdibleOrenco珊er(model#FTWO444-36)shallbeinstalledatthefinaloutlettee oftheseptictank/tanksorintheeffluentlinebetweentheseptictank/tanksandtheabsorption fieldtolimitthesizeofsolidsandsludgepasslngintotheabsorptionfield・Thefiltermustbe accessibleforcleanmgandreplacementfromthegroundsurface. ●　Thee鮒uentdistributionsystemshallbeconstructedinaccordancewiththe一一In珊rator TechnicalManual・一availablefromIn輔ratorSystemsInc.,123ElmStreet,Suite12,Old Saybrook,ConnecticutO6475. ・Aqiacentabsorptionfieldtrenchesshallbecomectedbyaserialdistributionsystemtoassure saturationoftheupgradienttrenchbeforeeffluentispassedtotheaqiacentdowngradient trench(SeeattaChedabsorptionfieldplanviewandcrosssectiondetails)・ ●　TheINFILTRATORSwillbecoveredwithsynthetic輔erfabric(140-200mesh)and coveredwithasurfacecap.Thesurfa・CeCaPShallbemounded5%overtheabsorptionfield・ ●　ThesystemcontractorShallbeawareofthepotentialforconstructionactivitiestoreducesoil permeabilitiesatthesitethroughcompaction・Smearlng,andshearing・Thefo11owlng precautionsandconstructionproceduresshouldbeempIoyedduringinstallationtominilnize disturbancetonativesoils: i.　Excavationshouldproceedonlywhenthemoisturecontentofthesoilisbelow theplasticlimit.Ifasampleofsoi-formsaropeinsteadofcrumblingwhen ro=edbetweenthehandsitistoowetandshouldbeallowedtodrybefore lV. excavationcontinues. Excavationandback制equlPmentShouldworkfromthesurfacewhereatall practicaltoavoidcompactionofthesoilsatdepth. Thebottomandsidewa=softheexcavationshouldbeleftwitharough,OPen surface.TheappearanceshouldbethatofbrokenorrlPPedsoilasopposedtoa sheared,Smeared,OrtrOWeledsurface.Anysmoothedorsmearedsurfa・CeS shouldberemovedwithatoothedrakeorsha11owrlPPertakingcaretoremove looseresiduesfromthebottomoftheexcavationbyhandifnecessary. Careshouldbetakeninplacingfi=materialsintheexcavationtoavoid damagmgtheexposedsoilsurfaces.6 4之0唯旦垂せこ亜 ●　Theownershallinstallastructuralbarrierifnecessaryandtakeprecautionstoprevent vehiculartra飾c,eXCeSSivesurfacewaterlng,aCCidentalflooding,OrOtheractivitiesinthe vicinityoftheabsorptionfieldwhichmaycompact,Saturate,OrOtherwisealterthesubsurface soilparametersusedindesignmgthesepticsystem. ●　TheownerwillplantandmaintaingrassorothershallowrootedcovercroptopreventerOSion andpromoteevapotranspirationovertheabsorptionfield. ●　Theownerw旧nspectandmaintaintherequiredmoundinganddrainageawayfromthe absorptionfieldtopreventsaturationfromprecipitationandsurfaceflows. ●　Tomitigatethegenerationofpreferentialflowchannelswhichmaycompromisethe operationofthesystem・theownerwillinspectandpreventintrusionofburrowlnganimals anddeeprootedplantsintotheabsorptionfield. ・Thesepticeffluent珊ershallbeinspectedandcleanedasnecessaryeverysix(6)months. ●　TheownerwillconductperiodicmaintenanceoftheseptlCSyStembyremovlngaCCumulated sludgefromtheseptictankevery3-4yearstopreventclogglngOftheabsorptionfield.7 ThisreportisasitespecificdesignforinstallationofanonsitewastewatertreatmentSyStemalldis applicableonlyfortheclientforwhomourworkwasperfomed.Useofthisreportunderother circumstancesisnotanappropriateapplicationofthisdocument.ThisreportisaproductofCCI Engineering/CronkConstructionIncorporatedandistobetakeninitsentirety.Excerptsfromthisreport maybetakenoutofcontextandmaynotconveythetrueintentoftherepor"tistheownerlsandowner’s agent,sresponsibildytoreadthisreportandbecomefamiliarwiththerecommendatiensanddesign guidelinescontainedherein. Therecommendationsanddesignguidelinesoutlinedinthisreportarebasedon:1)theproposedsite developmentandpIotplanasfurnishedtoCCIEngineering/CronkConstruetionIncorporatedbythe client,and2)thesiteconditionsdiscIosedatthespecifictimeofthesiteinvestigationofreference・CCI Engineering/CronkConstructionIncorporatedassumesnoliabilityfortheaccTraCyOrCOmPletenessof infomationfurnishedbytheclient・Siteconditionsaresu助ecttoexternalenvlrOnmentaleifectsandmay changeovertime.Useofthisplanunderdiiferentsiteconditionsisinappropriate.Ifitbecomesapparent thatcurrentsiteconditionsvaryfromthoseanticipated,thedesignenglneerShouldbecontactedto developanyrequireddesignmodifications.CCIEngineering/CronkConstructionIncorporatedisnot responsibleandacceptsnoliabilityforanyvariationinassumeddesignparameters・ cc量Engineering/CronkConstructionIncorporatedrepresentsthisrepo血asbeeppreparedwithinthe limitsprescribedbytheownerandinaccordancewiththec皿entaCCePtedpractlCeOftheenglneerlng professioninthearea・Nowarrantyorrepresentationeitherexpressedorimpliedisincludedorintended inthisreportorinanyofourcontracts. !人工)ノ ThomasA.Cronk,P.E. Date disposaIplanismeanttoincludethefo11owingfourpagesof graphicsincluding:1)pIotp-an・2)septic-ayoutplan・3)absorption圃dp書anview,and4) absorptionfieldcrosssection.Theplanisnottobeimplementedintheabsenceoftheserelated graphics・Inaddition,reSultsfromthepercolationtestandsoilsevaluationareincludedfor referenceasAppendixA・ NOTE:Thisi岡iVidua -C丁　人∀ハHつ工H一 ￣￣「 各さ 、ヽ 一　一　￣.-　一一\\\　\\〇日 ヽ、、 雪害 ○さ\、ヽ\ヽ、 ヽ、 ABSロRPTI□N F‘IELD　-　PLAN　>IEV SCA」巨1’こ20’ SERIAL DISTR旧UTION CONNECTiON DETAIL SCA」と:1/2’’=1’ SANCHEZ PRロJECT 3125　HIGHWAY13 2129-364-00-001 ABS□RPTIロN FIELD　-　PLAN V]EV AUGUS丁17,2018 SCA」巨l’=20’ APPENDIXA SOILSANDPERCOLATIONREPORT ccIENGINEERTNG/CRONKCONSTRUCTIONINCORPORATED9 ①CαENGINEERING l129.24"RoadcronkCo怖fr〃c的〃h〇・　　　GrandJunction,CO81505 Gr。ndJunction(970)245-0577.GlenwoodSprings/Aspen(970)64U“Email:CCigj@msn.com Date: Preparedby: Client: Propertyaddress: TaxscheduleNo.: Montrose/Delta(970)640-5029 soILSANDPERCOLATIONREPORT August4,2018 ThomasA.Cronk,P.E. 1129-24-Road GrandJunction,CO81505 970-24う-0577 CarlosSanchez =OWestMainStreet Silt,CO81652 970_379-9166 sanchezcarlos220@gmail・COm 312513Hwy.,Rifle,CO81650 2129-364-00-001 LegalDescript∴ Thesiteconsistsofapproximately7.62acresofuncultivatednativesoil・Drainageisapproximately3% tothesouthwest.Apercolationtest/soilsevaluationwasc○nductedonthepropertyofreferenceon o8/04/18byTomA.Cronk,registeredpr(fessionalengineer(R.P.E.)・Thepercexcavationtrench (excavationA)wasIocatedapproximately1651southoftheno血propertylineandapproximately325’ westoftheeastprope血y-ine.Additionalpercholeswerelocated30-southofthetrench(excavationB) and35-southeastofthetrench(excavationC)・ Asoilsobservationexcavationwasextendedtoadepthof96'一belowgroundsurface(BGS)・Therewas noevidenceofgroundwaterorhighseasonalwatertableintheopenexcavationtoadepthof96'一BGS. Thesoilsevaluationindicatesonedistinctsoilhorizonunderliesthesite.AlithoIoglCaldescriptlOn fbllows: 垣軸(i両　　地 0”-96”　sandyloam(USDA-1oamysand,Singlegrained,StruCtureless) percholeswereconstructedinexcavationAatadepthofapproximately36in.Additionalpercholes lO wereconstructedinexcavationBatadepthof38in・andinexcavationCatadepthof36in.Theholes appearedtobewellsaturatedatthetimeofthetest.ResultsofthepercolationtestareshowninTablel TABLEl PercolationTestResults 312513皿貧hwav 。。P,hl l TimeonO8/04/18 エ哩坦 lD「op Perc Rate min/in 15:55 16:15 16:35 (A)36’’-44’’ 675 90 中三」 _」 40/3.7う 11 (B)38’’-46’’ 812う 1175 13625 4015.5 7 但)36’’-44’’ 8.25 10.25 11.375 」_ l 40/3.125 13 ThisdocumentisrepresentativeofthesiteconditionsdiscIosedatthespecifictimeofthesite investigation.Siteconditionsaresu函CttOChangefromextemaleventsbothmallmade(irrigatiollOr waterfeatureconstruction)andnaturallyoccu証ng(floodingorexcessiveprecipitation).CCI Engineering′CronkConstructionIncorporatedisnotresponsibleandacceptsnoliabilityforany餌ure cc賞Engin。ering/CronkConstructionIncorporatedrepresentsthisreporthasbee叩reParedwithinthe limitsprescribedbytheownerandinaccordancewiththecurrentacceptedpractlCeOfthecivil engineeringprofessioninthearea.Nowarrantyorrepresentationeitherexpressedorimpliedisincluded orintendedinthisreportorinallyOfourcontracts. ThomasA.Cronk,P.E. 0 Grand Junct Cd ENGTNEERTNG 1129 -24- Road Grand Junction, GO 815O5Cronk Construction lnc. ion (970) 245-057'7 . Glenwood Springs/Aspen (970) 640-5029. Montrose/Delta (970) 640-5029 Ernai | : ccigj@rnsn.conl September 28, 2018 CERTIFICATE OF INSPECTION AND ACCEPTANCE Onsite Wastewater Treatment System Sanchez Project 3125 Highway 13 Rifle, CO 81650 2129-364-00-001 The onsite wastewater treatrnent system of reference was inspected on September 28, 201 8. The system was fbund to confbrrn with the plans and specifications set fbrtli in the engineered sewage disposal system design fbr the aforementioned property prepared on August 17,2018. Setback of OWTS components fiom property lines and easements are based on information provided by owner. Copies of the engineered plan may be obtained from the undersigned design engineer. Seal Grand .lunction. CO 81505 970-245-0577 Thomas A. Cronk, P.E. I 129 -24- Road dK.. tla L ar u oP =P Jo9L d-a s !; o_0dO( -IO; 6 uz u( fu olo)1,1;- +i 9 o/m," d(-c0.lLPs0:n oqquoo 3.5 a!- '1' I od -fao.! -; {o