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Home My WebLink AboutOWTS ReportON-SITE WASTEVúATER TREATMENT SYSTEM REPORT FOR 5538 CR 309 RULISON GARF¡ELD COUNW, CO PREPARED FOR GARFIELD COUNTY ENV]RONMENTAL HEALTH ONSITE WASTEWATER SYSTEMS 195 WEST 14TH STREET RIFLE, CO 81650 PREPARED BY RHINO ENGINEERING, INC. PO Box 1076 Grand Junction, CO 'iTtü4 RECE¡VED .-,îff ,i^i,iiP.,i?#il.t_î f t+' 0 MaV 4,2O2L ProJect # 210tO.02 This report and design were completed by John E. Kornfeld, P.E. on May 5, 202L. Mr. Kornfeld's contact information is: John E. Kornfeld, P.E. Rhino Engineering, lnc. PO Box 1076 Grand Iunction, CO 81502 970.250.1181 iohnk@rhinoensineers.com Mr. Kornfeld has been designing individual and commercial wastewater systems for more than 30 years. The property address is 5538 CR 309 and includes a partially developed lot. There will be a future 3- bedroom modular house placed on the lot. According to the Garfield County Parcel property information, the tax parcel identification number is 2L73-364-00-028 (tax account R470071). The owner of the property is CMH Homes, 5000 Clayton Road, Maryville, TN 37804. The legal description of the property is in the NE % SE % ConL. Section 36 Township 6 South Range 95 West of the 6th Principal Meridian and the detailed description is located in the Tax Account information that is found in the appendix of this report. The property is about 0.81 acres. There is an existing well located on the eastern center portion of the property This property is characterized as slightly sloping to moderately sloping with a north aspect. The property is not within a floodplain. According to NRCS Websoilsurvey, the soil mapping unit consists of 55 - Potts loam, 3 to 6 percent slopes. These soils are deep, i.e., more than 60 inches below the surface. These soils formed in alluvium derived from basalt and/or alluvium derived from sandstone and shale. These soils are rate limited by the NRCS for slow water movement. The soil description is located in the appendix. Two backhoe pits were excavated near the location where the proposed absorption area is proposed. At the time of observation, it had been raining during the evening and early morning hours. However, according to the typical soil profile of these backhoe pits, the soils include: O"- 4' Loam, granular structure, abundant roots 4"-28" Clay Loam, moderate subangular blocky structure, moderate roots 28"- 60" Loam, moderate subangular blocky structure, few roots Soil colors could not be determined at the time due to the raining event Depth to the water table is beyond 60" and the soil profile was very wet at the time due to rainfall. The soil profile is representative of the Potts loam. Per observations due to the ongoing rain and the impossibility of climbing in and out safely of the backhoe pits, a couple observations were made. At the east pit at the perc hole depth of 20", the estimated drop was 4" in one hour (15 minutes per inch). At the west pit at the perc hole depth of 42", the estimated drop was 6 inches in one hour (10 minutes per inch). Perc rates appear reasonably good, but a couple perc holes had water standing upon arriving at the site. This is believed to be the heavy rainfall the area had been experiencing. Desisn Based on Colorado Department of Public Health resulations: Physical features on the property that will require setbacks for this system include property lines, future water line, existing well, and the future residence. Setback regulations are listed below and are based on the new regulations. Calculations for the absorption area: The future residence has 3 bedrooms. Based on 3 bedrooms, the average daily wastewater flow will be 150 gallons per bedroom per day x 3 bedrooms for a total of 450 gpd. Based on 48" + of adequate soil, reasonably strong soil structure, and satisfactory perc rates but substantial percentage of clay, this soil is Type 3. W¡th a Soil Type 3, use a LTAR of 0.35 gpd/sf. Based on a LTAR of 0.35, the required surface area is 1286 square feet (450 gpd/0.35 gpd/sf). Using a gravity bed with perforated pipe and gravel, there is a 1.2 factor for a size adjustment for the soil treatment area. Therefore, the total absorption area is 1544 square feet. Us¡ng a maximum bed width of 12 feet, the required length is t28.7 linear feet (1544 square leet/I2 feet). The length of laterals cannot exceed 100 linear feet, so two beds will be necessary for equal distribution. SU PPLEM ENTAL SPECI FICATIONS AN D CONSTRUCTION REQU I REM ENTS The contractor must be approved and licensed by Garfield County Environmental Health for installation of on-site wastewater treatment systems. The contractor shall comply with Garfield County and the State of Colorado On-Site Wastewater Treatment System Regulations, effective date of July 7,2019, with the following supplemental provisions and/or construction requirements: L. The building sewer to septic tank pipe shall be four (4) inches in diameter. 2. The minimum size of septic tank shall be 1000 gallons, although a 1250-gallon tank is recommended. 3. The minimum distance between the septic tank and the absorption area shall be 20 feet. 4. The following mínimum setbacks shall be observed: Source Absorption Field Water line Domestic well Dwelling Property lines 10' 100' LO' 10' Subsurface drain 25' lrrigation ditch -open -lined -gated -solid pipe 50' 25', LO' 10' 5. To avoid surface flow infiltration and saturation of the new absorption system, abandonment of any ¡rr¡gation in the vicinity of the disposal system is required (if necessary). Diversion ditches necessary to divert surface flows around the new absorption area must mainta¡n the minimum setbacks listed above. 5. The surface 24" ol surface soils are to be removed for a double 12' wide by 55 feet long absorption area. Stockpile the surface soils to be used as the cover over the gravity system. 7. Final cover shall not be placed on sewer lines, septic tank, or the absorption area until the system has been inspected by the design engineer and the Garfield County Environmental Health. The installer shall provide 48-hour notice to the engineer and the Garfield County Environmental Health for all required inspections. 8. Fabric shall be installed over the gravel system after final inspection by the Garfield County Environmental Health representative and the engineer. 9. All access manholes on sept¡c tanks will be child proof and contain appropriate warning labels if accessible to the public. Confined space entry precautions should be observed by maintenance personnel. 10. The surface cap over the gravel system shall consist of native soil material mounded 3-5% over the absorption field to promote surface runoff. 11. All setbacks are measured from the toe slope of the topsoil cap - not from the edge of the absorption area chambers. cIE-lQz_r1 0^ --l9ırF-c)Eo>'n--.!.>Ão'c)Trlz--1mnñó'ãI?IÈIcIÉf,Iîìlı'ß6IIrÍãt''irlEH!!LOCATION W GOOGLE5538 CR 309RULISON, COLORADOl¡rIFflffi @oôFa*<3Hq<ii(JHfiÉ-')lEffi2UTILITY NOTIFICATION CENTEROF COLORADOcM afmEwlreDAEffirumeÆdüqv^E Fm mÍAmG Glffi@ND WmSffirc$Æ\-*n-\IIIII,\/\lV\ì\\\lr.dII\\\cR 309I1l1rï\\IIì\ììl-I#IIIt*ñ\o\útrrc UTILITY NOTIFICATION CENTEROF COLORADONdlfiEmGO^Sffi&dqffiGACAVAE ffi ffi MARNG f WAM UTUE3r.aa< ra^L___-___12"-1{so.aLANDSCAPE FABRIC OR EOUAL4" PERFORA'IED PIPE1" - 2 1/2" DRATN RoCkUYþNI2trffi.d 2o'-SCARIFY 6" OF SOILLONbA_l60r'L- - - - - - - --.1lEXISTING SOIL PROFILE+SEEPAGE BED DETAILSECTTON OF EXIS?TNG SOTL PROFILE VS. COMPLETE ABSORPTION BEDzo(noEôo-v: NãH9OvO-ö'JoiLnãOnXÉß2o-jJÉıU)q@sña UTILITY NOTIFICATION CENTEROF COLORADOruðiæAV E FG ËE t^ruG F Uoffiqm U¡!ÌESSEEPACE BED DETAII,SDISIRIBUTON BOX AND MANIFOLD SYSIEM(soLrD P|PE)65.0'TABLE OF ESTIMATED ELEVA'TIONS FOR DESIGN/CONSTRUCTONFINISHEDELEVATION EXISTNGELEVATONEX 4" INVERT FROM HOUSE 5317.0* 53,19INV IN SÊPTIC TANK 5316.0 5318INV OUT SEPTIC TANK 5315.8 5318INV IN DISIRIBUTIONBOX 5310.0 5312INV iN SEEPAGE BED 5309.8 5312TOP OF COVER OVER BED 5312.0 5312TO SEPTIC TANK12.O'3'EXISÎNG ELEVATONS ARE PER GOOGLE EAR'IH ANDFINISHED ELEVAÏONS ARE ESÏMATED. INSTALLER TO VERIFY ELEVATONS & REQUIREDGRADES TO MEET GARNELD COUNTY CODE REQUIREMENTS.PERFORA-IED PIPE(CONNECTED AT ENDSWTH SOLID PIPING)NOIE: PERFORA]ED PIPEBEGINS 1.5' INSIDE GRAVELBEDSEEPAGE BED(EX'tENf OF GRAVELS)* THE BOTTOM OF ÏHE SIRUCÏURE WLL LIKELY BE 2I FEET ABOVE EXISTING GROUND.NTSNOTES:1. REMO\E VEGETA]ION OVER ABSORPTON AREA.2. EXCAVA]E AND REMOVE SURFACE SOILS TO APPROXIMAIELY 24" DEP]H.5. VERIry ]HAT AT LEASÍ 4E INCHES OF SUITABLE SOILS EXìST ABOVE ANY SEASONAL HIGHWA'IER TABLE. NO SEASONAL WAÌER TABLE IS ANTICIPAIED,4. AFTER NA'IIVE SOILS ARE TO GRADE, SCARIFY ]IIE NEXT 6 INCHES.5. PLACE GRAVEL AND INSTALL DIS]RIBUTON MANIFOLD AND PERFORA'TËD PIPES PER ABOVEDIMENSIONS.6.lHE DISIRIBUÎON MANIFOLD SHALL BE INSTALLED "LEVET TO A MAXIMUM OF 1/8" PER FOOT7. IHE TOPSOTL 'CAP" SHALL BE SLOPED (18" 'tlltCKNESS AT CEN]ER TAPERTNG TO 12" ATOUTSIDE). THE FINISHED SURFACE OF 'THE SEEPAGE BED SHALL MATCH lHE EXISIING GROUND,8. SEIBACKS ARE MEASURED FROM ÏrE TOE OF SLOPE (TOPSO|L CAp).9. ALL CONS'IRUCTON, DIMENSIONS, AND MAÏERIALS SHALL COMPLY IVI]H GARFIELD COUNTYON_SITE WASTEWAIER IREA1VENT SYS-IEM REGULANONS UNLESS O'THERWSE SPECIFIED.10. AC'IUAL CONFIGURAÏON OF SEPIIC TANK TO SEEPAGE BED ORIENTAÍ]ON MAY VARYDEPENDING UPON SIIE CONDITONS AND DIMENSIONS.RMEsruh=*jj_j-i(nJah9€äqf;sB-û;ınıFTJEulOÉ.U''(I]@4ffi 54ÈütqEIEotÀ=ËËcÉ¡åItft{rGEIçtIMPROWMENT SURYEY PLATCount9Roed,No.sdfeâfÁî\BF'ünd td Þtar mdAbdre1.1/4' Talreu nâÅic&.p-"Soülua l$rllø.siÍæAIÆrt'-fi'.PROPERTTD&SRIPIæ¡YA ÑACt È IAI@UI ÈE ùAU.rSAr/4 $ SCrDrg4 trrtrrÍSgtp6 s(nntd RÁIEE 9swRsî oF tgc elzl P,xr DññiE@ AS FOüþrJc :sEca¡lBrcrj¡æRl[Eßm. ¡, á Folflt nrıRtsr'rB rtst¡lrvE oF':FE LâtD Dæ@8Ðñ DW RæCtmÐ N æCñ t¿s] A?pAæ St? rf ¡EB ünICE æffi ølñú cz,'lrArø RñnD5ß (F @RFBÃ qxtf,|y. øÆDq, rfl?i;RgBcrt 7fr8 gEr?'' rÃtg O8 tngarcttl ú vAt oî tÍß @nrf noþ WEEBFá6SS tttßOt Otr&ÁrD,'.llÇ-Ii "t8fr8ffiÍIßN,y Atþ'rc lr8 rtstl¡tEoF sarD îRAcr vm ræfDooRtrR.ño. 4 IfGiUEB¿lBIfFLf AND AAnÃÌL8'. to t¡iD æüIÍ?rßf¡/¡D ¡@ XE, tD OORMn ftr. 9, 'l'øtEB,TIR'âBR'.T',Í¡) PARA',T&L îC' T''E TÃß æNT'EI|T gUD CORTERS¡Yo, I AND 1 zVO¡lEE?t9 oon¡E¡¡fD. I o[f f7ßaoulrtER¿y UtB (,FÍâE ñEtT Ø VAy.(p SâID cürf,':rR(¡{tì î'8rUBrE$¡RLyAtþñ Íflß xxmt g[t@tD&R:l'unB cÞaÁrD æ@trßoitDI30ta8' ÍroooRlt¡R IÍr. t, t tB ptorfiî or ffiiltwilrtñx/REæ Vmt 7:ttÂrn3ÁqroF&¿trDr¡!ñßw¿tþ pllñcãl, a N IÆ itÊtt 4gB1/í @sEclolf s6', lutumm6sorrft Et¡foags v8slræraB dÍ?r p.,rnDBrcruiæ)¡¡yQir¡rC!áIaABADFBCORIED ærOæR 27, ¡98ttr806 71f5¡rt pAøE &1t.,æINTY(Døff'E,DÈorÞls ôEfsdricYcþr4s'{-4'ÞsÞ9,tRldttoilfgæeBI/,EEMA8þÆ,k7æ,PagEA4suRyErìrrs æRIIFICÄÍA, ¡tcc,t¡L J. r¿¡tsËorul4 ¡'üß8g.r c&FÍnt gt? trfrr E¡t rás ¡REPáR@ FoRr¡|UçB¡IIRMA'RI T âITD COUK'ilInsáT;ET'A'ID'fr8'Tg'NArcB ær@ÁI'T'¡D,E¡EREBsf,lBÞ{RCE¿SâpFEltRá¡rcEArrÞyttl@ßß tt, gqNt, INÃt I À@tE{Ís'.y.REfÈESEm¡á $ÍnlE?, ¡EmußnEDatr& Ey yE w afira8f- ït f,nEsvugur, rgrßsBD orly¡íÞ¡ø¡oEqt rm'oKÂtnr âtD w,llf, âf,D 1,8A1 tî Ctñ¡oFæ frmtflß C(Ættm lsf/ütDinals ¡rR ¡¿¡E grPt E t¡ù OF fæ øpmn/rß&rßD OFRÞOtS?lßAflo¡l, rlt PE¿Ás Pttlf ìÊrttlD finræynngøÈeirUnS Ord,RnErfrR¡tüWi8 0FIEEOOrOß¡r{r¡EIGrÞailn Egg&sGrot. tm¡cEß&tp¡tB ß Mlto,t.r¡fflE tDßD fit æâ¡YæiBSS Otø0rþ rt n:RÂrlft ü cfrràßã¡ræ 0F AÍr¡tfæ¿RæEDlilO gftEEE,aîArtulo,arfltra.øtËÍfIIO MÍtnÉå-dd,-rlf (¡!qEæ&tturlpld fmæcmtEÈ¡¿sstrO MfSAó-odt-VePdtúûr'ü¡pd Bttt'Â ¡ttún ?ààÞgw¿¡æÞìIIIIIIIIIËrofrcô[æa.o.SlrldEþtaqSprí!rldsú'n-@orrå*vtdtIIIIIII-1IrIIItIl1IIII'tIIFıqttløaNd7238m5538 6ntU Roqdßo.88o.&ttA@d:4'úDi|d.t'..qlìrlés\rYlTD{,1 =ftfiNSoil MafRifle Area, Colorado, Parts of Garfield and Mesa Counties(5538 CR 309)NENWeb Soil SurveyNational Cooperative Soil Survey=hR3¡o 2A4SNgsI39.2949NIFIFeRIIEt¡üIseçêËeENANTlæñ1æÃrzozçZnlv'lap Scaþ: 1 : 1,440 if priËd m A hndscaæ (11" x &5) *eeL0æÆælnÊd0$1(x)rncDf"bp pro¡fin: ìÂþb ftkrcabr Csnermdin#s: WGS84 Ëlgett¡:s: tÍM AneÉI\¡\il,GS84?g.7ø3ñEß.Þ=Bß.t.6DA:Natural ResourcesGonsewation Service31311202'lPage 1 of3g 2d4zilxttn2f.r3gJ24nø2Ð?Ðg)o 2t¿12!N Natural ResourcesGonservation ServiceSoil MapRif,e Area, Colorado, Parts of Garfield and Mesa Counties(5s38 CR 309)Web Soil SurveyNational Cooperative Soil Survey3t31t2021Page 2 oÍ 3MAP LEGENDMAP INFORMATIONThe soil surveys that comprise yourAOl were mapped at1:24,000.Warning: Soil Map may not be valid at this scale.Enlargement of maps beyond the scale of mapping c€¡n causemisunderstanding of the detail of mapping and accuracy of soilline placement. The maps do not show the small areas ofcontrasting soils that could have been shown at a more detailedscale.Please rely on the bar scale on each map sheet for mapmeasurements.Source of Map: Natural Resources Conservation ServiceWeb Soil Survey URL:Coordinate System: Web Mercator (EPSG:3857)Maps from the Web Soil Survey are based on the Web Mercatorprojection, which preserves direction and shape but distortsdistance and area. A projection that preserves area, such as theAlbers equal-area conic projection, should be used if moreaccurate calculations of distance or area are required.This product is generated from the USDA-NRCS certified data asof the version date(s) listed below.Soil Survey Area: Rifle Area, Colorado, Parts of Garfield andMesa CountiesSurveyArea Data' Version't3, Jun 5,2020Soil map units are labeled (as space allows) for map scales1:50,000 or larger.Date(s) aerial images were photographed: Dec 31, 2009-Oct12,2017The orthophoto or other base map on which the soil lines werecompiled and digitized probably differs from the backgroundimagery displayed on these maps. As a result, some minorshifring of map unit boundaries may be evident.Area of lnterest (AOl)SoílsArea of lnterest (AOl)Soil Map Unit PolygonsËl SpoilAreaË Stonyspottr VeryStonySpott wet spotô Other+'. Special Line FeaturesWater FeaturesStreams and CanalsTranspoÉationt+l Rails¡r lnterstate Highwaysffis US Routes:*-::1. Major Roads:. : Local RoadsBackgroundI Aerial Photographyfi¡. Soil Map Unit LinesI Soil Map Unit PointsSpecial Point Featurestg¡ Blowoutm BonowPitH clãyspot,+ Closed DepressionÞ{ Gravel Pit"1 Gravelly Spotü LandfillÀ Lava Flow& Marsh orswampæ Mine or Quarry6 Miscellaneous Water6 Perennial Waterqf RockOutcrop+ Saline Spotþ; Sandy Spotë Severely Êroded Spot# Sinkholeþ Slide or Slipø Sodic SpotUSDA: Soil Map-Rifle Area, Colorado, Parts of Garfield and Mesa Counties 5538 CR 309 Map Unit Legend ilap Unit Symbol Itlap Unit Name Acres ln AOI Percent of AOI 55 Potts loam, 3 to 6 percent slopes 7.8 85.2o/o 56 Potts loam, 6 to l2 percent slopes 0,3 3.10/o 1.1 9.2 11.7o/o 100.0% USDAv-Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 3t31t2021 Page 3 of 3 Map Unit Description: Potts loam, 3 to 6 percent slopes--Rifle Area, Colorado, Parts of Garfield and Mesa Counties 5538 CR 309 Rifle Area, Colorado, Parts of Garfield and Mesa Gounties 55-Potts loam, 3 to 6 percent slopes Map Unit Setting National map unit symbol: jnyr Elevation: 5,000 to 7,000 feet Farmland classification; Prime farmland if irrigated Map Unit Gomposition Potts and similar soils; 85 percent Esfimafes are based on obseruations, descriptions, and transects of the mapunit. Description of Potts Setting Landform: Valley sides, benches, mesas Down-slope shape: Convex, linear Across-s/op e shape: Convex, linear Parent material: Alluvium derived from basalt and/or alluvium derived from sandstone and shale Typicalprofile Hl -0to4inches: loam H2 - 4 to 28 inches; clay loam H3 - 28 to 60 inches.' loam Properties and qualities S/ope;3 to 6 percent Depth to restrictive feature: More than 80 inches Drainage c/ass; Well drained Runoff class; High Capacity of the most limiting layer to transmit water (Ksat): Moderately high (0.20 to 0.60 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None F req uen cy of ponding; None Calcium carbonate, maximum content: 15 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water capacity: High (about 10.3 inches) lnterpretive groups Land capability classification (irrigated): 3e Land capability cl assificatio n (non i rrig ated) : 3c Hydrologic Soil Group: C Ecologicalsife; R048AY298CO - Rolling Loam USDA - Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 313112021 Page 1 oÍ 2 Map Unit Description: Potts loam, 3 to 6 percent slopes--Rifle Area, Colorado, Parts of Garfield and Mesa Counties 5538 CR 309 Hydricso,Trafing. No Data Source lnformation Soil Survey Area: Rifle Area, Colorado, Parts of Garfield and Mesa Counties SurveyArea Data: Version 13, Jun 5,2020 USDA - Natu¡al Resources Conse¡valion Service Web Soil Survey National Cooperative Soil Survey 3t31t2021 Page2oi2 =ÍBß.IIñIBß.Septic Tank Absorpt¡on Fields-Rifle Area, Colorado, Parts of Garfield and Mesa Counties(5538 CR 309)39p 2g4gNIE39P 28¿lS NI5çIEI5gPIFeoEËIFRIËoEtNAz.71ENN71û211z'024rÁt)lvlap Scaþ: 1 : 1,440 if FiËd m A hndscape (11" x AÐ $eetnÆc)'ln0s)1mãJJm¡4ap Fqj€dion: V',€b fqercabr CorEr @dinaÞs: \iJGS84 Ë9e tics: IJTM Zone 13N l ,GS8424rzmWeb Soil SurveyNational Cooperative Soil SurveyN7ø=IBß,0=Bß.r,.6DA-Natural ResourcesGonsewation Sewice3t31t2021Page 1 of53fP 2S4ZN24ßm2f.tæn24Énñ?pn:fP 2941N TJSDA-Natural ResourcesConservation SeruiceSeptic Tank Absorpt¡on Fields-Rifle Area, Colorado, Parts of Garfield and Mesa Counties(5538 CR 30e)Web Soil SurveyNational Cooperative Soil Survey3t31t2021Page 2 of 5MAP LEGENDMAP INFORMATIONArea of lnterest (AOl)I Area of lnterest (AOl)SoilsSo¡! Rating PolygonsE VerylimitedE Somewhat limitedtf Not limitedE Not rated or not availableSo¡l Rat¡ng L¡nes4 Verylimitedr t Somewhat limitedr4 Notlimitedt t Not rated or not availableSoil Rat¡ng PointsI Very limitedtr Somewhat l¡mited¡ Not limitedtr Not rated or not availableWater FeaturesStreams and CanalsTransportat¡on¡4¡ Rails,.rdr lnterstate Highwaystud US Routesri;:i Major Roads-'::: Local RoadsBackgroundI AerialPhotographyThe soil surveys that comprise yourAOl were mapped at1:24,000.Waming: Soil Map may not be valid at this scale.Enlargement of maps beyond the scale of mapping can causemisunderstanding of the detail of mapping and accuracy of soilline placement. The maps do not show the small areas ofcontrasting so¡ls that could have been shown at a more detailedscale.Please rely on the bar scale on each map sheet for mapmeasurements.Source of Map: Natural Resources Conservation ServiceWeb Soil Survey URL:Coordinate System: Web Mercator (EPSG:3857)Maps from the Web Soil Survey are based on the Web Mercatorprojection, which preserves d¡rect¡on and shape but distortsdistance and area. A projection that preserves area, such as theAlbers equal-area conic projection, should be used if moreaccurate calculations of d¡stance or area are required.This product ¡s generated from the USDA-NRCS certified data asof the version date(s) listed below.Soil Survey Area: Rifle Area, Colorado, Parts of Garfield andMesa CountiesSurveyArea Data' Version 13, Jun 5,2020Soil map units are labeled (as space allows) for map scalesl:50,000 or larger.Date(s) aerial images were photographed: Dec 3't, 2009-Oct12,2017The orthophoto or other base map on which the soil lines werecompiled and digitized probably difiers from the backgroundimagery displayed on these maps. As a result, some minorshifting of map unit boundaries may be evident. Septic Tank Absorption Fields-Rifle Area, Colorado, Parts of Garfield and Mesa Counties 5538 CR 309 Septic Tank Absorption Fields Map unit symbol Map unit name Rating Component name (percent) Rating reasons (numeric values) Acres in AOI Percent of AOI 55 Potts loam, 3 to 6 percent slopes Very limited Potts (85%)Slow water movement (1.00) 7.8 85.2o/o 56 59 Potts loam, 6 to 12 percent slopes Potts-lldefonso complex, 25 to 45 percent slopes Very limited Very limited Potts (85%) Potts (60%) Slow water movement (1.00) 0.3 1.1 3.1o/o 11.7o/o Slope (0.04) Slope (1.00) Slow water movement (1.00) lldefonso (30%)Slope (1.00) Large stones (1.00) Totals for Area of lnterest 9.2 100.0% Rating Acres in AOI Percent of AOI Very limited 9.2 Totals for Area of Interest 9.2 10O.Oo/o 100.0olo USDAv-Natural Resources Gonservation Service Web Soil Survey National Cooperative Soil Survey 3t31t2021 Page 3 of 5 Septic Tank Absorpt¡on Fields-Rifle Area, Colorado, Parts of Garfield and Mesa Counties 5538 CR 309 Description Septic tank absorption fields are areas in which effluent from a septic tank is distributed into the soil through subsurface tiles or perforated pipe. Only that part of the soil between depths of 24 and 60 inches is evaluated. The ratings are based on the soil properties that affect absorption of the effluent, construction and maintenance of the system, and public health. Saturated hydraulic conductivity (Ksat), depth to a water table, ponding, depth to bedrock or a cemented pan, and flooding affect absorption of the effluent. Stones and boulders, ice, and bedrock or a cemented pan interfere with installation. Subsidence interferes with installation and maintenance. Excessive slope may cause lateral seepage and surfacing of the effluent in downslope areas. Some soils are underlain by loose sand and gravel or fractured bedrock at a depth of less than 4 feet below the distribution lines. ln these soils the absorption field may not adequately filter the effluent, particularly when the system is new As a result, the ground water may become contaminated. The ratings are both verbal and numerical. Rating class terms indicate the extent to which the soils are limited by all of the soil features that affect the specified use. "Not limited" indicates that the soil has features that are very favorable for the specified use. Good performance and very low maintenance can be expected. "Somewhat limited" indicates that the soil has features that are moderately favorable for the specified use. The limitations can be overcome or minimized by special planning, design, or installation. Fair performance and moderate maintenance can be expected. "Very limited" indicates that the soil has one or more features that are unfavorable for the specified use. The limitations generally cannot be overcome without major soil reclamation, special design, or expensive installation procedures. Poor performance and high maintenance can be expected. Numerical ratings indicate the severity of individual limitations. The ratings are shown as decimal fractions ranging from 0.01 to 1.00. They indicate gradations between the point at which a soil feature has the greatest negative impact on the use (1.00) and the point at which the soil feature is not a limitation (0.00). The map unit components listed for each map unit in the accompanying Summary by Map Unit table in Web Soil Survey or the Aggregation Report in Soil Data Viewer are determined by the aggregation method chosen. An aggregated rating class is shown for each map unit. The components listed for each map unit are only those that have the same rating class as listed for the map unit. The percent composition of each component in a particular map unit is presented to help the user better understand the percentage of each map unit that has the rating presented. Other components with different ratings may be present in each map unit. The ratings for all components, regardless of the map unit aggregated rating, can be viewed by generating the equivalent report from the Soil Reports tab in Web Soil Survey or from the Soil Data Mart site. Onsite investigation may be needed to validate these interpretations and to confirm the identity of the soil on a given site. 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