HomeMy WebLinkAboutOWTS Design Report 12.27.2019r$rtÍnr&lffiþ¡,bc.$Gôokúniûa{ ard Maþriab Eng¡ræersand Environmental ScienlistsAn Employcc otrricd Componys0z0Coúnry Road 154Glenwood Springs, CO 8ló01phone: (974\945:7988fax: (97A)945-M54enail kaglenwaod@hmansa.somwww.kumarusa.comrOtrrrc L¡cdio¡¡s: Donver (t[Q), Parker, Cobrado Sprín€Ê, Forr Coflínt, çlÉûwood Springs, and $ummit Cømty,CaløfuONSITE WASTEWATER TREATMENT SYSTEM DESIGNPROPOSED RESIDENCELOT 4, NATM SPRINGS14 NATIVE SPRINGS DRIVEGARFTELD COUNTY, COLORADOPROJECT NO. 19-7-s 4s.02DECEMBNR27,2OI9PREPARED FOR:J & M CONSTRUCTIONATTN: MARCUS RENOVA & SILVIA AGTIILAR200 \il 20th STREET, TRAILER D6RTFLE, COLORADO 81650(silviaaeuilar2 @ aolcom)
TABLE OT CONTENTSINTRODUCTIONPROPOSED CONSTRUCTION-l--1-1J4458I9SITE CONDITIONS..SUBSURFACE CONDITIONSOWTS ANALYSISDESIGN RECOMMENDATIONSSOIL TREATMENT 4R84........O1ü/TS COMPONENTS .......OWTS OPERATION AND MAINTENANCE...OWTS HOUSEHOLD OPERATIONOWTS MAINTENANCEOWTS CONSTRUCTION OBSERVATION ....-9-LrMITATIONS......... ."'- 10 -FIGURESFIGURE I _ OWTS SITE PLANFIGURE 2 _ USDA GRADATION TEST RESULTSFIGURE 3 _ SOIL TREATMENT AREA CALCULATIONSFIGURE 4 _ SOIL TREATMENT AREA PLAN VIEWFIGURE 5 _ SOIL TREATMENT ARE CROSS SECTIONATTACHMENTSVALLEY PRECAST 1,250 GALLON, TWO-CHAMBER SEPTIC TANK DETAILTUF-TITE 4-HOLE DISTRIBUTION BOXlúrnar & ¡¡odd¡e, lnc.oPrdßrrno. $-7-ilg"gil
INTRODUCTIONThis report provides the results of an onsite wastewater treatment system (OWTS) design for aproposed residence to be located on Lot 4, Native Springs, 14 Native Spríngs Drive, GarfieldCounty, Colorado. The purpose of the report was to provide design details for the OWTS inaccordance with the 2018 Garfïeld County Building Department Onsite Wastewater TreatmentSystem Regulations and the Colorado Department of Public Health and EnvironmentalRegulation #43. The services are supplemental to Kumar & Associates agreement forprofessional services to J&M Construction dated September 13,2019.PROPOSED CONSTRUCTIONThe structure will be a single-story, single-family residence with four bedrooms, located on thelot as is shown on Figure 1. The floor will be structurally supported over crawlspace with afinish elevation of 5388.5 feet which is slightly above the existing ground surface. The proposedsoil treatrnent area (STA) for the OV/TS will be located to the south of the proposed residence asshown on Figure 1. The STA will be sized for four bedrooms. V/ater serviçe will be providedby an on-site well located to the north of the proposed residence, see Figure l.If proposed construction is different than that described, we should be contacted to re-evaluateour design recommendations.SITE CONDITIONSThe proposed residence w¿N under construction at the time of the field exploration. The groundsurface is relatively flat, sloping down to the southwest at about 2Yo gade. The domestic waterwell for Lot4 is located approximately 40 feet north of the proposed residence. Lot 3, theadjacent property to the south, has a water well located as shown on Figure 1. A recently pipedinigation ditch trends north to south about 40 feet east of the proposed Lot 4 residence.Vegetation consists of grass and weeds.l$nrw &lñdç,ltw.tPlrc$ú,ìlo.t*7'g?"0i2
-2-SUBSURFACE CONDITIONSThe field exploration for the OWTS was conducted on December 5,2019. Two profile pits(Profile Pits I and 2) were excavated with a backhoe at the approximate locations shown onFigure 1 to evaluate the subsurface conditions at the proposed STA for the OWTS. The pitswere logged by a representative of Kumar & Associates. Logs of the profile pits are providedbelow.Log of Profile Pit ILog of Profile Pit 2Bottom of pit @ 9feet.Very makt sails encountered @ 6%feet.Water seepage andwet soils encountered @ 7%feetNo free water or redoximorphic features observed at time of pit excavation.aaaaSANDY LOAM; moderately blocþ structure, very stiffto medium stiff, slightlymoistto wetwith depth. brown.1',-8',MAN-PLACED FILL; sand and clay, very stifl slightly moist, dark brown tobrown.0'-1'USDA ClassificationDepthThe soils encountered in profile pits, below about 3 inches of topsoil at Profile Pit 1 and I foot ofman-placed fill at Profile Pit2, consisted of Sandy Loam to the pit depths of I feet. Hydrometerand gradation analyses were performed on a disturbed bulk sample of the soils from Profile Pit Ifrom 5 to 6 feet depth with the results provided on Figure 2. The tested sample (minus No. l0size sieve fraction) classifies as Sandy Loam per the USDA system and as Soil Type 2 per Stateregulations. Very moist to wet soils were encountered at depths of about 6%to 7%feet at thetime of excavation with water seepage encountered in Profile Pit2 atTY¿ feet.aaaaDisturbed bulk sample obtainedfrom 5 to 6feet.Bottom ofpit @ 8feet.Very moist soils encountered @ 7 feet.No free water or redoximarphic feahtres observed at time of pit excavation.SANDYLOAM; moderately blocþ structure, very stiffto msdium stiff, slightlymoist to very moist with depth" brown.3"-g'TOPSOI; organic Loam, firm, slightly moist, brown.0'-3"ldurnø&itctffidç,lttc.$Prorect Ho. 1*7-sÉ3.02
JBased on the tactile profile pit evaluations and laboratory testing, the soils at the STA have beenclassified as Type 2 per State regulations, which equates to a long-term acceptance rate (LTAR)of 0.60 gallons per square foot per day.O\ryTS ANALYSISBased on the site conditions and profile pit evaluations, the evaluated area should be suitable fora conventional infiltration soil treatment system consisting of chambers in a trench configuration.The base of the soil treatment trenches will be in Sandy Loam soils (Soil Type2) for which wewill use an LTAR of 0.60 gallons per square foot per day to size the STA. The depths of theinfiltrators should be kept shallow, about I to 2 feet, due to the relative shallow groundwater atthe site. The system will be designed for four bedrooms and an average daily flow of 75 gallonsperperson with double occupancy in three bedrooms and single occupancy in the fourthbedroom for a total of7 persons.The effluent will gravity flow from the residence to the septic t¿nk for primary treatment andthen gravity flow to the STA for dispersal and fïnal treatment. The STA will consist of threetrenches with Infiltrator Quick 4 Plus Standard chambers. Equal distribution will be provided tothe chambers and trenches by a distribution box.The STA was moved to the west of the originally planned STA. An additional profile pit shouldbe excavated near the southwest end of the STA at the time of inst¿llation to confìrm the soiltype and groundwater level at the design STA location.A 100 feet setback is required to the wells from the proposed STA. The proposed STA isestimated to be 125 feet away from the on-site well and 105 feet away from the Lot 3 neighbor'swell as currently planned. A l0 feet setback is required from the piped irrigation ditch. Theseptic t¿nk and the STA are over 30 feet from the piped ditch as currently planned. A 20 feetsetback is required to the residence from the proposed STA. The proposed STA is 25 feetawayfrom the residence as currently planned. A 25 feet setback is required from the proposed STA toany potable water supply lines. The locatíon of the water supply line from the well is currentlyl$sna&lffis,lnc-oPro¡eA no. 1*7-f43.ß2
-4-not designed. If the water supply line is within 25 feet of the proposed STA, we should benotifi ed for addítional recommendations.DESIGN RECOMMENDATIONSThe design recofitmendations presented below are based on the proposed construction, the siteand subsurface conditions encounteredo and our experience in the area. Alayout of the proposedOWTS components is provided on Figure l. If conditions encountered during construction aredifferent than those that are described in this report, please contact us to re-evaluate our designrecommendations.SOIL TREATMENT AREAo The STA will consist of three trenches with 18 Infiltrator Quick 4 Plus Standardchambers placed in the native Sandy Loam soils (54 chambers total). Equal distributionwill be provided to the trenches by a distribution box.o The STA was sized based on aû LTAR of 0.60 gallons per square feet per day.o Each chamber was allowed 12 square feet of area. A30% reduction of the STA size wasapplied for use of Infiltrator chambers in a trench configuration. The total design STAsize is 648 square feet. Soil treatment area calculations are shown on Figure 3.o A minimum of four feet of undisturbed soil between the trenches is required.o Cut depths for the trenches should be limited to a maximum of 2% feet to maintainseparation to groundwater.o A minimum of four feet of separation is required from groundwater level to the base ofthe trenches.o A minimum of 12 inches and a maximum of 24 inches of cover soil should be placedover the top of the chambers.o The trenches should be oriented along ground contours to minimize soil cut and cover.o The base and sidewalls of the trench excavations should be s,qifigd prior to the chamberplacement.e Backfill should be graded to deflecf surface water away from the STA and should besloped at 3 horizontal to I vertical or flatter.o Disturbed soil should be re-vegetated as soon as possible with a native grass mix. NoKrmar&Aoroddoo,lnaoProirdtlo.l*7-ilr.ûz
-5-,1'withdeep)rofts should be planJed on or near thÞ STA as this/\(\!¡ Four-inch diameter inspection ports should be installed vertically into the knockoutsprovided in the Infiltrator end caps. Install vents at each end of each trench. Theinspection port piping should be screwed into the top to the chambers and should notextend down to the ground surface inside the chambers. The inspection ports shouldextend at least I inches above the finished ground surface or be protected in a valve boxat finished grade.o A plan view of the STA is presented on Figure 4 and a cross section of the STA ispresented on Figure 5.o The STA must maintain a minimum 100 feet setback to any wells.o The STA must maintain a minimum 10 feet setback to piped irrigation ditches.o The STA must maintain a minimum 20 feef setback to the residence.r The STA must maintain a minimum 25 feet setback to the on-site water supply line.OWTS COMPONENTSRecommended OWTS components provided below are based on our design details and ourexperience with the specific component manufacturers. Equivalent components may be feasiblebut need to be approved by us prior to construction.Septic Tank¡ A Valley Precast 1,250 gallon, two-chamber septic tank or equivalent septic tank will beused for primary treatment. A detail of the tank is provided as an attachment to thereport.o An effluent filter should be installed in the tank outlet tee.o The tank must be a minimum of five feet from the residence and from the STA. The tankmust be a minimum of 10 feet from any potable water supply lines.o The tank must be set level. The excavation bottom must be free of large rocks or otherobjects that could damage the tank during placement. A road base or gravel beddingmaterial may be needed to prevent tank damage during placement and act as a levelingcourse.Kumar & Associateô, lnc.oPrejec{ t{o.'19'7-ã43.$2
-6-o The tank lids must extend to final surface grade and made to be easily located.r Inslall the tank withz feet minimum cover soil for frost protection. Maximum tank soilcover is 4 feet.r The septic tank must maintain a minimum 50 feet setback to any wells.o The septic tank must maintain a minimum 10 feet setback to piped irrigation ditches.o The septic tank must maintain a minimum 5 feet setback to the residence.r The septic tank must maintain a minimum l0 feet setback to the on-site water supply line.o The septic tank must maintain a minimum 5 feet setback to the STA.Sewer Pipeo The sewer line úo the septic tank should not be less than the diameter of the buildingdrains and not less than 4 inches in diameter.o The sewer pipe should have a rating of SDR35 or stronger. Schedule 40 PVC pipe isrequired beneath all driveway surfaces.o The sewer pipe should be sloped between 2o/oto 4Yoto help limit disturbance of solids inthe tank and potential sewage bypass of the first chamber of the tank. If a steeper slope isneeded, this can be accomplished with vertical step-downs in the sewer line.o A minimuqlS inches of cover soil should be provided over the sewerpipe. Paved areas,patios or other areas without vegetative cover may be more susceptible to frost and werecommend 36 inches of soil cover over the sewer pipe in these areas, and the pipe beinsulated on top and sides with 2-inch-thick blue foam insulation board. If adequate soilcover is not possible, we should be contacted for re-evaluation prior to installation.o The sewer pipe should be bedded ín compacted% inchroad base or native soils providedthat the native soils contain no angular rocks or rocks larger than2% inches in diameterto help prevent settlement of the pipe. Sags in the pipe could cause standing effluent tofreeze and damage the piping.o Install cleanout pipes within 5 feet of the building foundation, where the sewer pipesbend 90 degrees or more and every 100 feet of sewer pipe.o 41190-degree bends should be installed using a 9O-degree long-sweep or by using two45-degree elbows.l{u¡tw &Añáç,htc.eP|¡cÆf,l'Æ..19-7-ilt.02
-7-aThe sewer line location shown on Figure I is considered conceptual. We assume thatthere will be only one sewer line exiting the residence. It is the responsibility of theowner/contractors to locate all sewer line exit locations and connections to the septictank. We should be notifìed if there are more than one sewer line exiting the building.Eflluent Transport Pipingr The effluent transport pipe should be 4-inch diameter SDR35 piping sloped at aminimum of ZYo to flow from the septic tank to the distribution box and from thedistribution box to each tench. Piping should extend at least 6 inches into the topknockout provided in the Infiltrator end caps and be screwed in place. Splash platesshould be installed beneath the inlet piping to help limit scouring of the infiltrative soilsurface in the chambers.o The effluent transport pipe should be bedded in compacted% inchroad base or nativesoils provided that the native soils contain no angular rocks or rocks larger thanL%inches in diameter to help prevent sçttlement of the pipe. Sags could cause standingeffluent to freeze and damage to the piping.o A minimum l8 inches of cover soil should be provided over the effluent transport pipe.Paved areas, patios or other areas without vegetative cover may be more susceptible tofrost. We recommend 36 inches of soil cover over the effluent pipe and insulation with atleast 2 inches of rigid foam insulation in these areas. If adequate cover soil is notpossible, we should re-evaluate the condition prior to installation.o The effluent pipe should be double encased with larger diameter Schedule 40 PVC pipeundemeath driveway surfaces and be provided with at least 42 inches of soil cover and beinsulated on top and sides with 2-inch-thick foam insulation board.r All 9O-degree bends should be installed using a 90 degree long-sweep or by using two45-degree elbows.Distribution Boxo The distribution box will be used to equally divide effluent flow between the trenches.We recommend the Tuf-Tite 4-Hole Distribution Box since it is easily accessible fromground surface for maintenance. A copy of the distribution box deúail is provided as anattachment to this report.l$mar&A¡¡ochos,lnc.ePrqþct to. 1*7-g?"ú¿
-8-
The distribution box outlet pipes should be equipped with Tuf-Tite speed levelers for ease
of initial setup and adiustment over time.
The distribution box must be accessible from ground surface for inspection and
maintenance per State guidelines.
The effluent line from the septic knk should be directed downward into the distribution
box with a 9O-degree elbow inside the box.
The distribution box must be installed level on a compacted road base subgrade to ensure
equal effluent distribution. If settlement of the distribution box occurso unequal effluent
distribution may take place which could cause hydraulic overload of one of the trenches
and potential failure. The distribution box should be monitored periodically, and the
speed levelers should be adjusted as necessary for levelling. The ground surface above
and around the distribution box should be graded to drain away surface water to prevent
standing water near the distribution box.
OWTS OPERATION AND MAINTENANCE
The OV/TS will require periodic inspection and maintenance to function properþ. A properly
designed, installed and maint¿ined system can greatly increase its lifespan. The level of
maintenance will vary depending on the complexity of the system and water use habits of the
residents. We recommend that an OV/TS Operation and Maintenance (O&M) Manual be
developed. Depending on the complexity of the system, a contract with an OWTS maintenance
provider may be prudent. Below are some basic recommendations for the OWTS O&M.
OWTS HOUSEHOLD OPERATION
r Use of high efficiency water fixtures is recommended to decrease the hydraulic load on
the OWTS system.
o Fix plumbing leaks immediately as this may cause a hydraulic overload of the STA.
o Do not irrigate the area on top of or directly upgradient of the STA as this may cause a
hydraulic overload.
o Do not dispose of household waste down drains as this may clog or damage OWTS
components. Examples of household waste include: dental floss, cotton swabs, coffee
grounds, paper towels, feminine products and many other kitchen and bath items.
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-9-rlritelre*¡ wasterveter "hn,rl d be Screenert fhOrorrybly-@deseñiposed fu tlre seFEîe ræik ãrdo'."oftener backrvash in household be necessar.V@ofillers in powder detergents may result incan freeze during extended periods ofnon-useoweather. We recommend that atankOV/TS MAINTENANCEaInspect the septic tank, distribution box and STA at least annually for problems or signsof failure.The fìlter should be cleaned annually by spray washing solids into the first chamber ofthe septic tank.The septic tank should be pumped and cleaned every 3 to 5 years depending on use.Longerpumping intervals may increase the amount of solids that reach the STA, whichmay shorten its life span.Pumping of the septic ønk should take place when the level of the sludge and scumlayers combined take up about 25 to 33o/o of the capacity of the first chamber of the tank.oaO\ilTS CONSTRUCTION OBSERVATIONThe Garfield County Building Department requires that the designer of the system provide arecord drawing and certification of the OWTS construction (As-Built inspection). V/e should beprovided with at least 48-hour notice prior to the installer needing the inspections. Prior toissuance of our certifìcation letter, we require observation of all system components prior tolßms&Ac¡oddoa,lnaûProJocútlo. t*7-il!"92
-10-backfill. The number of site visits required for the inspection will depend on the installer'sconstruction schedule.LIMITATIONSprectrr'es í¡r t nê we#anqr€'ttrcr expreÊ€ed er i . Therecommendations provided in this report are based on the site conditions, profile pit evaluationsand soil texture analysis, the proposed construction and our experience in the area. Variations inthe subsurface conditions may not become evident until excavation is performed. If conditionsencountered during construction appear different from those described in this report, we shouldbe notified so that re-evaluation of the recommendations may be made.This report has been prepared for the exclusive use by our client for design purposes. We are notresponsible for technicalinterpretations by others of our information, As the project evolves, weshould provide continued consultation and field services during construction to review andmonitor the implementation of our recommendations, and to veriff that the recofirmendationshave been appropriately interpreted. Signifìcant design changes may require additional analysisor modifications to our design.It is our opinion that the designed location of the OWTS components does not violate anysetback requirements of the current Garfield County Regulations. Below is a table of commonminimum horizontal setbacks to OWTS components. Refer to the Garfïeld County Regulationsfor a complete list of required setbacks. We recommend the OWTS components locations besurveyed by a Professional Colorado Land Surveyor.Teble 1 - Common Minimum Horizontal Setbacks from OIYTS10'0'5t50'BuitdingSewerl0'50'50'Septic Tank10'50'10'5'10'100'STA50'10'20'25',)525'LinedDitchorLakeOccupiedIlwellingWaterSupplyLinelYellsSepticTrnkDryDitchorGulchLake,frrigationDitch,Streaml$tnw&løæúdr*r',bw-cPßfiællle.1*7-g?.ü¿
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¡--- 11-Please contact us for any necessary revisions or discussion after reviçw of this report by GarfieldCounty, If you have any questions, or if we may be of funher assistance, please let us know.Respectfully Submitted,KmrsEar &r ,{ssoeiates. åxnc.Shane M. Mello, Staff EngineerReviewed by:David A. Young, P.E.sMru/rjf
Fis. 4SOIL TREATMENT AREA PLAN VIEWKumar & Associates19-7-543.02INFILTRATOR QUICK4 PLUSSTANDARD CHAMBERS IN 54 INCH DIAMETERNON-PERFORATEDSDR55 TRANSPORTPIPE SLOPED ATA 2U MIN. DOWNTO DISTRIBUTIONBOX.ÏRENCHES. lE CHAMPER TRENCH (54 TorAL).TUF-TITEDISTRBOXINFILTRATOR QUICKPLUS STANDARDEND CAP4. ilIil. UNDISÍURBEDTRANSPORT PIPING SHOULD BEINSERTED AT LEAST 6 INCHESINTO THE UPPER KNOCKOUT IN4 INCH DIAMETERNON-PERFORATEDSDR55 TRANSPORTPIPE SLOPED ATA 2X MIN. DOWNIO TRENCH.THE END CAP. INSTALLPLATES BENEATH INLET PIPINGTO HELP LIMIT SCOURING OF THEINFILÏRATIVE SURFACE.INCH DIAMETER PVC OBSERVATION PORTSINSTALLED VERTICALLY INTO THE KNOCKOUTSPROVIDED IN END CAPS. INSTALL PORTS ATEACH END OF EACH TRENCH. REMOVABLELID TO BE PLACED ON TOP OF PIPE. PIPEMUST STICK UP AT LEAST 8 INCHES ABOVEFINISHED GRADE OR BE PLACED AT GRADE INAN ACCESSIBLE VALVE BOX. PIPES SHOULDNOT EXTEND TO SOIL SURFACE AND SHOULDBE SECURED TO CHAMBER WITH SCREWS ORCOUPLINGS TO PREVENT SLIDING DOWNWARD.ISCALE-FEETNgte",'1. Chambers should be installed level on a scarified ground surface. Concrete sand may be used as a leveling course ifnecessary.2. Care should be taken by the contractor to avoid compaction of the native soils in the trench areas. The base and side walls oftrench excavations should be scarified prior to chamber installation.3. All piping should have a rating of SDR35 or stronger.4. Changes to this design should not be made without consultation and approval by Kumar & Associates.5. Referto the 2018 Garfield County Onsite Wastewater System Regulations for other applicable specifications.ËfflvEEN TNENCHES
Fig. 5SOIL TREATMENT AREA CROSS SECTIONKumar & Associates19-7-5ß.A212" min. 24" max.Cover Soil Gradedto Deflect Surfacelnfiltrator Quick 4 PlusStandard ChamberExcavate 36"Wide TrenchWaterlnstalled LevelË\¡stingG¡ound SurfâcêScarify ground surface priorto chamber placementNotes:1. Chambers should be installed level on a scarified ground surface. Concretesand may be used as a leveling course if necessary.2. Care should be taken by the contractor to avoid compaction of the native soils inlhe trench areas. The base and side walls of trench excavations should bescarified prior to chamber installation.3- Changes to this design should not be made without consultation and approvalby Kumar & Associates.22.5SCALE-FEETNative Soil4'SoilBetween
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Kumar & Associates19-7-513.02Fig. 1OWTS SITE PLANo25SCALE-FEETEI25and Cap1OO'SETBACKFROM WELLttL.S. 19598 inPlacc380.00'\IIIII\PipedIrrigationDitch\LOT 4\. NATIVEtçeRrucs¡t\14\NATIVESPRINGS10'sFEAcKT0 DRIVE\.PIPED DITCH \\I4 BIDROOMRESIDENCEDirtHCLEANOUÏfVALLEY PRECASTI-I,250 GALLON TWO CHAMBERSEMC TANK.SEIBACKTOSNUCTURE \PROFILTPnl I.IUF-ÏTTEI4-HOLE DISTRIBUTION BOXDirt\\ttI(Rebar and CapL.S. 19598 in*",@Place,IIII/LOT 3J2-e e- -----_\)LOT 5\\\--lII\\/\/IIPR0POSED S0lL ïREAlt\4ENT AREA(sTA) C0NSTSTNG 0F 3 RoWS 0F.IS INFILTRATOR QUICK4'\ã/v(aroä:tÛqøUÈaoSTANDARD CHAMBERS (54CHAMBERS ToTAL).I/\'&,00'SETEACK/FROMWELL\////I\vIttILOT 6