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Home My WebLink AboutOWTS Engineer DesignGnnTIELD COUNTY OWTS RTPONT 308 CrtlDYS Wnv GnnnELD CouNrY, CoLoRADo May 2023 Prepared by Calíber Engthaerfng, lnc, 0233 Countv Rood 265 Riflc, CO 8í650 970.625.+3+4 CollbrEn gineerln g@u tlook. com GnnTIELD COuNTY OWTS RTPORT 308 CIruDYS Wnv GnnnELD CouNTY, ColonADo "l hereby affirm that this Onsite Wastewater Treatment System (OWTS) report for 308 Cindys Way, Garfield County, Colorado was prepared by me, or under my direct supervision, for the Owners thereof in accordance with the provisions of Garfield County's OWTS Regulations and approved variances and exceptions listed thereto. I understand the County does not and will not assume liability for OWTS facilities designed by others." l-* f. rr*¿ø License No Licensed Professional Engineer, State of Colorado (Affix Seal) Rrvrrweo Bv: TERRY BENDETTI, P.E. Caliber Engineering Project # 2022-OO7 .001 2 Tnelr or COruTENTS 1.0 lntroduction 2.0 Preliminary lnvestigation Property Information Topography Soil Data Location of Physical Features Additional Information Landscape Position Natural and Cultural Features Current and Historic Land Use 3.0 Detailed Soil lnvestigation Visual Evaluation Tactile Evaluation 4.0 Recommendations 5.0 lnstallation Observations 6.0 Operation and Preventative Maintenance Schedule 7.O Limitations 5 5 5 5 6 6 6 6 7 7 7 7 7 I t0 11 11 3 Appendix OWTS Site Plan Sheet 1 OWTS Details Sheet 2 NRCS Soils Map NRCS Absorption Field Soils Data NRCS TexturalTriangle Caliber Engineering, lnc. Soil Observation Logs Caliber Engineering, lnc. Soil Texture by Feel OWTS Design Spreadsheet 4 1.0 Introduction At the time this report was developed the subject property . ls classified as Residential Property. . Comprises 10 acres. . Located in Antlers Orchard Track 38, Garfield County, Colorado It is being proposed by the current Owner to construct a one bedroom, single family residence on the subject property. The purpose of this report is to present the preliminary investigation, reconnaissance information and design for the onsite wastewater treatment system (OWTS) that will treat wastewater generated from the proposed residence, as required by Garfield County's Regulation 43 (Reg a3). Personnel contributing to this report are: . Terry Bendetti - PE/CPOW Certified Competent Technician/NAWT Certified Designer 2.0 Preliminary lnvestigation Property Information Phvsical Address: 308 Cin dys Way, Garfield County, Rifle, Colorado 81650 Leoal Description: Section 33; Township 5; Range 92; Antlers Orchard Track 38. County's Account Number for the property is R008107 and the Parcel Number is 212733300358. Existing Structures: There is an existing wood frame, 4 bedroom modular home with a shop on the property. These structures were permitted for construction in October of 2017. Domestic Water: There are no wells on the subject property; water for the existing structures is provided by a cistern. According to the Colorado Department of Water Resources, there are several wells in the area of the subject property, with the closest being shown on sheet 1. Sepfrc; There is an existing individual septic disposal system on the subject property treating wastewater for the 4 bedroom modular home. The existing system was permitted in October, 2017 and consists of: A 1,250 gallon concrete septic tank. 720 square feet absorption area; trench type 48 units of Arc-36 infiltrators. Four trenches with 12 infiltrators per trench. The system location is shown on sheet 1 Topography Topography in the vicinity where the new OWTS will be located slopes from northeast towards the southwest at average grades of between 4 to 6 percent. 5 Soil Data According to the Web Soil Survey developed by the Natural Resources Conservation Service (NRCS), soils associated with the subject property are classified as map units 3. NRCS soil unit 3 is Arvada Loam, which has grades of between 1 to 6 percent. This data agrees with field observation. NRCS soil data indicates soil unit 3 is very limited for septic tank absorption fields due to slow movement of water. This agrees with field observations of the two test pits; texture of the in-place pit soils exhibited characteristics that allowed the soil to be formed into a ball, indicating silty clay soils. However, by observation, it is the opinion of Caliber Engineering, lnc. that soil characteristics will not prevent adequate installation and operation of an OWTS. Plotting the percentages of clay, sand and silt published by the NRCS for soil unit 3 on the USDA Textural Triangle indicates the soil would classify as a silty clay loam. Silt clay loam soils have a classification of type 3 or 34, both are suitable for absorption fields. The long term application rates (LTAR) for type 3A and 3 soils are 0.30 and 0.35 gpd/ft2, respectively. Location of Physical Features Physicalfeatures on the subject property that will require minimum horizontal setbacks are shown in the following Table. All distances are in feet. Structure with Basement, Crawl Space, Footing Drains 102 5 50 5*F 0 STA 100 20 10 2Crossings or encroachments may be permiited at the poinls as noted above provided that the water or wastewater conveyancepipeisencasedfortheminimumsetbackdistanceoneachsideofthecrossing. Alengthofpipewithaminimum schedule 40 rating (ASTM Standard D 3034-16 (2016 version)) of sufficient diameter to easily slide over and completely encasetheconveyancemustbeused. Rigidendcapsofatleastschedule40rating(ASTMStandardD3034-16(2016 version)) must be glued or secured in a watertight fashion to the ends of the encasement pipe. A hole of sufficient size to accommodate the pipe must be drilled in the lowest section of the rigid cap so that the conveyance pipe rests on the bottom of the encasement pipe. The area in which the pipe passes through the end caps must be sealed with an approved underground sealant compaf ible with the piping used. Other methods of encasement that provide equal protection are allowed, but must be approved by lhe local public health agency. Add itional I nformation a. Easements: There are no known existing easements on the subject property b. Floodplain Maps: According to FEMA (Federal Emergency Management Agency) the floodplain panel for this location is 08020509708 dated 1211511977, which is not printed. This indicates flooding does not present ahazard. Landscape Position The landscape posit¡on for the STA is considered bacl</side and the slope shape is concave - linear (CL) towards the southwest. Potable Water Supply Line 6 Cistern Property Lines Septic Tank Septic Tank 502 10--10r -"*Effluent Line 5 Natural and Gultural Features No natural or cultural features were identified in the site reconnaissance. Current and Historic Land Use The subject property has been historically zoned rural residential and is expected to remain rural residential in the future. 3.0 Detailed Soil lnvestigation A detailed soil investigation to determine the depth to the limiting layer, if any, and properly classify the soil type was conducted on May 9, 2023. Visual evaluation of two soil profile test pits were conducted in the field and samples collected from each test pit. Test pits were excavated adjacent to the location proposed for the STA, see sheet I for locations. Visual evaluation of both test pits was conducted under adequate light conditions, with the soil being in an unfrozen state. Visual Evaluation Two test pits, TP-1 and TP-2 were previously excavated on the subject property by the Owner's Excavator. These test pits were used to determine soil types, limiting layer and the best depth for the infiltrative surface. Caliber Engineering, lnc. personnel evaluated and logged the excavations. Test pit TP-1 was excavated to a depth of 84 inches. From the surface to 6 inches, the soil is topsoil. From the bottom of the topsoil zone to the bottom of the excavation three horizons were observed, however all 3 horizons exhibited characteristics of silty clay loam. The first horizon was between 6 inches to 24 inches, the soil began to show signs of moisture. Between the depths of 24 inches to 78 inches the moisture content became more prominent. At the depth of 78 inches a water layer was encountered, which is the limiting layer. A soil sample was collected from this pit between the depths of 24 inches to 72 inches. Test pit TP-2 was excavated to a depth of 96 inches and was similar to TP-1 . TP-z also exhibited topsoil with a root zone for the first 0 to 6 inches, with three horizons from the bottom of the topsoil zone to the bottom of the excavation. At a depth of 80 inches a water layer was encountered, which is the limiting depth. A soil sample was collected from this pit between the depths of 24 inches to 72 inches. Soil observation logs and photos can be found in the Appendix All measurements are from ground surface. Tactile Evaluation On 512012023, Caliber Engineering, lnc. conducted a soil textural by feel evaluation on the soil samples collected from test pits TP-1 and TP-2. Results of the soil gradation revealed: 1. Total sample size from both samples = 1,000 ml. 2. Percent rock in sample TP-1 = 0%; Percent rock in sample 1P-2 = Oo/o 7 3. Soils are not type "R". Performing the soil texture by feel methodology on the samples are shown in the following table *Weak < 1 inch; Moderate 1-2 inches; Strong > 2 inches Results shown in the above table indicate a USDA soil classification of silty clay, soil type 3 or 3A To determine the proper soil type, the USDA soil structure type and grade were used. The following Table shows the soil's USDA structure type and grade determined for the sample. SAMPLE USDA Soil Structure Tvpe USDA Soil Structure Grade TP-,1 Blockv Moderate rP-2 Blocky Moderate According to Table 10-1 , section 43.10 of Reg 43, soil types 3 and 3A can have a blocky structure type, but only soil type 3 can have a strong soil structure grade. As such, the soil to receive the effluent waste is classified as soil type 3. Soil type 3 has a LTAR of 0.35 gpdlft2 for the application of effluent treated to treatment level 1 (TL1). 4.0 Recommendations The existing residence on the property has 4 bedrooms, the proposed residence has 1 bedroom, making a total bedroom count of 5. Under Reg 43 5 the design flow rate for 5 bedrooms is 600 gallons per day (gpd) This is under the maximum 2,000 gpd requirement to be approved and governed by the State, jurisdiction is under Gafield County's Reg 43. As such, an OWTS as a wastewater treatment system is suitable for this site. At a minimum, the OWTS shall have: . A septic tank.. A distribution box. Four trench type STA.. Category 3 distribution media in the STA. . One distribution box.. 4" diameter PVC service lines. lnfluent from the residence will be conveyed through influent service lines, by gravity, to a new septic tank. From the septic tank, effluent will be conveyed through effluent service lines to a distribution box. The distribution box will divide the effluent flow into equal volumes to be delivered to each trench. All influent/effluent flow will be by gravity and influent/effluent service lines shall be installed per associated plans and details. I SAMPLE Sample Depth from Ground Sufface lft) Does Soil Form a Ball (yes/no) Does Soil Form a Ribbon (ves/no) *Type of Ribbon Formed (Weak, Moderate, Stronq) How Does the Soil Feel (G ritty/Smooth/Neither) TP-1 4.0 Yes Yes S Smooth TP-2 4.0 Yes Yes S Smooth The proposed residence is a 1-bedroom, single family residence. Per Table 6-1 of Reg43 the design flow rate must be for a2 bedroom home and will be 300 gpd. The OWTS STA site elevation is approximately 6,569 feet above sea level (NAVD 88) and will be located southeast of the proposed residence. The septic tank will also be installed southeast of the residence- Both locations are shown on sheet 1. Sewer Pipe: Sewer service influent pipe shall be 4-inch solid wall SDR-35 PVC installed per plans, but may be adjusted in the field as field conditions warrant. The minimum grade for service lines shall be 2o/o and the maximum grade shall be 17%. Step downs are required if service line grades exceed 17o/o. Joints shall be solvent welded. Cleanouts are required: 1) Within 5 feet of the proposed structure. 2) At spacing not to exceed 100 feet. 3) Upslope of two or more bends closer than 10 feet. AII 90 degree bends shall be constructed using two, 45 degree fittings. The pipe shall be properly bedded per the typical trench detail presented on sheet 2. Sepfic Tanks. One new 1 ,000 gallon septic tank with two bays will be required. The tank must be on the Colorado Department of Public Health and Environment's accepted septic tank list. The tanks and lids shall conform to current County OWTS regulations and be traffic rated. The tanks shall be installed with insulated, watertight access risers having lids that can be secured. Risers shall meet the tank manufacturer's requirements for type and installation. There shall be an effluent filter and its handle shall extend to within twelve inches of the lid. The septic tank shall 1) Be located down gradient of the home. 2) Have a covering of no more than 4.0 feet in depth nor less than 1.0 foot, measured from the top of the tank lid to finished grade surface. 3) Be at a location accessible for pumping and maintenance. Prior to installation of the tank, the installer must ensure tank placement will allow connection of the tank's inlet invert to the piping from the residence as shown on the plans. lf tank installation can't be accomplished as shown on the plans, the tank can be set to have between 1.0 to 4.O-feet of cover over its lid, measured from the top of the lid to surface grade. lf cover thickness is less than the minimum 1.O-foot, or more than the maximum 4.O-feet, the tank can be moved closer or farther from the residence to meet cover thickness requirements. Movement of the tank must be along the influent or effluent service pipe alignments. A septic tank having a cover thickness less than 1.O-foot or greater than 4.0- feet will not be allowed. lf the tank is raised higher than shown on the plans and there is not at least a minimum cover of 36- inches over the influent and/or effluent piping, insulation must be installed over the pipe per the detail on sheet 2 until the minimum cover over the pipe is met. I # Bedrooms Occupancy (# of Persons) Wastewater Flow per Person Design Flow (gpd) 2 4 75 300 Distribution Box: The distribution box shall be centered as shown on sheet 1 in a manner to distribute effluent equally to the distribution lateral manifold. The Engineer should be contacted if alignments or locations change to verify regulation requirements are maintained. The box should be capable of one inlet pipe, having an insertion point a minimum of 1-inch above outlet openings and 4 outlet openings. Boxes with more than 4 outlet openings will have the excess openings plugged. Soil Treatment Area: The soil treatment area was sized using criteria found in section 43.10 of Reg 43 for a 2-bedroom residential home using: . Trenches for the soil treatment area. . Effluent application by gravity. o Chambers for the distribution media. The following table summarizes sizing of the STA. The STA shall be excavated as field conditions require using the following guidelines. 1. Four trenches having 10 infiltrators each. 2. Trenches shall be no wider than 3 feet. 3. Trench lengths shall be no greater than 50 feet. 4. A minimum of 4 feet shall separate trenches, measured sidewall to sidewall 5. The infiltrative surface shall be between 0.5 to 2.33 feet from the surface. 6. Trench floors shall be level and set at the infiltrative surface. 7. Chambers shall be placed per the manufacturer's directions. Chambers shall cover a minimum of 90o/o of the required excavated area per 43.13.8.1.d The STA shall have a final soil cover as described on sheet 2. This may mean that the STA cover will need to be 16-inches +/- when initially placed to allow for settlement over the freeze-thaw of a winter season. The surface of the STA shall be seeded after installation of the system. A native, upland seed mix should be used. These mixes do not require irrigation and develop growth 10 to 15 inches high. No automatic sprinkler system shall be installed over the STA. Vehicular traffic and livestock shall be kept off the STA. No landscaping, impervious surfaces or plastic sheeting can be installed over the STA, which will reduce performance of the STA. 5.0 lnstallation Observations lnstallation of the OWTS tank, effluent lines, distribution box and infiltrators shall be observed by the design engineer. Our office shall be notified by calling 970-625-4344 at least three days in advance to schedule personnel to observe installation of these features. lnstallation of these features should be substantially complete and ready for backfill prior to requesting individual or simultaneous observation inspections for these features. No. Bedrooms Daily Design Flow (gpd) LTAR Method of Application Adjustment Factor Distribution Media Adjustment Factor Adjusted STA Size (sf) No. Chambers (1Ssf/chamber) 2 300 0.35 10 0.7 600 40 10 6.0 Operation and Preventative Maintenance Schedule The goal of an operation and maintenance schedule is to observe the operation, and perform minor maintenance to the onsite wastewater system to allow for proper, long-term functioning of the system. Septic tanks: The scum and sludge accumulation in the septic tanks shall be monitored yearly. Once the cumulative scum or sludge thickness reaches 25o/o of the tank depth, the entire tank shall be pumped. A pumping frequency of 1 to 3 years is expected at design flows. An alternative is a regular pumping frequency of every 2 years. Effluent Filter. The effluent filter at the septic tank discharge shall be cleaned (hosed off) at the time of pumping or as needed. General: System users must realize that an on-site wastewater treatment system is different from public sewer service. There are daily considerations, such as not putting plastic or other non- biodegradable material into the system. Water use shall be monitored so that toilets are not allowed to leak when seals malfunction. Allowing fixtures to flow continuously to prevent water lines from freezing is not acceptable. Although the proposed system can accommodate variable flows, spreading water use over several hours and eliminating peak flows is recommended. To illustrate the point, a malfunctioning toilet can discharge more than 1,000 GPD. Excessive daily loading could flood and irreparably harm the STA. Caliber Engineering, lnc. does not recommend installation of a water softener. The chemical and hydraulic loading from the backwash of a water softener would be damaging to the STA, so if a softener is installed, a separate drywell should be constructed for the backwash waste. The design of the OWTS is based on the treatment of domestic sewage only. Swimming pool or spa water is not to be discharged into the OWTS. The proposed OWTS design is based on the regulatory flows noted in the attached calculations. lncreased flows may hydraulically or organically overload the OWTS, causing premature failure. No landscaping or plastic can be used over the STA, which would reduce the performance of the STA 7.0 Limitations Our investigation, layout, design, and recommendations are based on site visits and the best information available at the time. The contents of this report shall not serve as the basis for any third party engineering design. lf conditions that are considerably different from those described in this report are encountered, Caliber Engineering, lnc. shall be called to evaluate the conditions. lf the proposed construction is changed, Caliber Engineering, lnc. shall be notified to evaluate the effect changes have on the OWTS, prior to the changes being made. All construction shall be in accordance with the Garfield County's Reg 43. Pipe type and size, burial requirements, septic tank construction, and other specifications, which are not depicted in this report, shall conform to the requirements of the County's Reg 43. The installer of the system shall be acceptable by the County's Environmental Health Department. 11 Appendix OWTS Site Plan Sheet 1 OWTS Details Sheet 2 NRCS Soils Map NRCS Absorption Field Soils Data NRCS Textural Triangle Caliber Engineering, lnc. Soil Obseruation Logs Caliber Engineering, Inc. Soil Texture by Feel OWTS Design Spreadsheet 12 o=!:oıgı6æl!¡Ð.--lnccoColibcr Enqlncoring,O2S hnty Rdd æ5 Riff.,"""*"'ffi-'@FRATZKE SINGLEFAMILY RESIDENCEGARFIELD COUNTY. COLORADO$iffilü!ËËtïËli¡IËËËå$!::Èit¡¡t¡l¡¡¡¡Ëti¡tË$ tç¡iril$ËiurìIIËlr*Ë¡i€rlìil¡gü;g{Ë¡!qt!¡JË!tÈiËÈqËIIEIËËilËËlËiÈül;ii,iürüht¡ã*II4Itð¡¡{ìiÇ¡l$iiiågÈ5s:ì$¡Èi:rlrTà5IElåt¡tIxe l-'lË tlt4.1I¿ÉË.rHÊúÈòBcyNtsIfItFI¡rãtf l IiËÊfrtï5lHFlilc'IEauÍ{c¡i{¡å'l{8a:]rli¡:l_t!liB¡rftEir Ël-i r Èiçuiå-c -årl EI!;'{ÈÈt1!!¡8IEcf,8rttÍ[Itiåâî tÊt; Collb.r Enofn..rlno.o2JJ counly Rí{d 2ôs Rrlfã,-*""ffi*-'lnc.@FRATZKE SINGLEFAMILY RESIDENCEGARFIELD COUNTY. COLORADOoìgg¿N)*ÈRil$t:l"ÈÈiì$-HÈ$BË*I1TIèÍrÈ*È!ËN]ffiMMNÆfunæMm#þÉ20'{ÞRÈ3gIãáã$ü=dÊåtËÊËË{RaTËPtÈdtËd;l H:t tdit È+tæLËt\LAfd--l:!¡Ëi*!4sFtHhi.F8ÈNËFì*{s,s:ñrilh;IËËË$müÈHs¡NItti¡¡riËlËHsl¡tËlFËIÈ-È$,ËËËËðvË,ËÈ,ïË¡fii*$¡ i,ffi ihIðÈPtiiiiïårlirliËir[iiFÈ¡ ll'HFNFñtìÞflRtãIËiaaEIB¡,HHhììtItHËñËNHËhìHBã{ÈdhÀ* - '$ltlilËffi,$n!Ëfr¡Ì¡üfiiit¡ii¡silIËËiËIliË,il$ÈÈo¡È$ÈåiEå$scc8ädïå:Ë¡:¡ìåsgrgcÈ'ce¡gN¡IEçãñ3!IÈstfÍ¡IédfIIIËI¿?oI!ttË3ãlsFËeäFIett;ii;E¡i:i¡åi¡ I !!Í'i¡ ãiì¡;'iåiiiii¡iTi,åiËiåfå¡¡ryiå¡rÊ;ËdrE1TfEñ3¿ËiriI I.{RCS Soils Mup =oSoil Map-Rifle Area, Colorado, Paris of Garfield and Mesa Counties(FraÞke Residence)=No2æ510ffi70Natural ResourcesGonservation Service26æ026@267û26810ffi702ææ0ãm26050m110æ" 34 21'NIÈãasF*Rı3üxIÐæ. 34 21'NFHaH*ñi4Ffifi3Iü==NAffi7026630266MÆ7ûMap Scah: 1:2,950 if priîted m A lanócape (11" x 8.5) sheÉ,lvlders040801æ210ftd01t200ð0Map proiedion: V1êb Mercabr ComerordrEtes: WGS84 $etics: UTM Zone l:lN WGS84Æ10268702fr,1105t21t2023Page 1 of3USDA-Web Soil SurveyNational Cooperative Soil Survey39" 34'7'N2@O266@æ039. 34 7" N USDA-Natural ResourcesConservation ServiceSoil Map-Rifle Area, Colorado, PaÉs of Garfield and Mesa Counties(FraÞke Residence)Web Soil SurveyNational Cooperative Soil Survey5t21t2023Page 2 of 3MAP LEGENDMAP INFORMATIONïhe soil surveys that comprise your AOI were mapped at1:24,OOO.\ årning: Soil Map may not be valid at this scale.Enlargemeni of maps beyond the scale of mapping can causemisunderstanding of the detail of mapping and accuracy of soilIine placement. The maps do not show the small areas ofcontrasting soils that could have been shown at a more detailedsca le.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) Iisted below.Soil Survey Area: Rifle Area, Colorado, Parts of Garfield andMesa CountiesSurvey Area Data: Version 15, Sep 6,2022Soil map units are labeled (as space allows) for map scales1:50,000 or larger.Date(s) aerial images were photographed: Aug 25, 2021-Sep5,2021The 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 minorshifiing of map unit boundaries may be evident.Area of lnterest (AOl)El Spoil Areaå Stony Spotß Very Stony spotV Wet SpotÂ Other*r Special Line FeaturesWater Featuresr',"v Streams and CanalsTransportationH,4#Raìlslnterstate HighwaysUS RoutesMajor RoadsLocal RoadsBackgroundI Aerial PholographyArea of lnterest (Aol)So¡lstf Soil Map Unit Polygonsä; Soil Map Unit LinesI Soil Map Unit PointsSpecial Point FeaturestÐ Blowoutm Borrow PitH Clay Spot+ Closed Depression\f Gravel PitÈrü;i Gravelly Spotü Landfillñ_ Lava Flow4b Marsh or swamp* Mine orQuarryü Miscellaneous \Aåter0 Perennial WaterqÉ Rock Outcrop+ Saline Spot:.: Sandy SPot€Þ Severely Eroded Spotô Sinkholeþ Slide or Slipø Sodic Spot Soil Map-Rifle Area, Colorado, Parts of Garfield and Mesa Counties Fratzke Residence Map Unit Legend Map Unit Symbol Map Unít Name Acres in AOI Percent of AOI ó Arvada loam, 1 to 6 percent slopes 33.2 78.0o/o 30 Heldt clay loam, 6 to 12 percent slopes 6.8 16.1% 40 Kim loam, 3 to 6 percent slopes 2.5 6.0% Totals for Area of lnterest 42.5 100.lYo USDA7-Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 5t21t2023 Page 3 of 3 I'{RCS Absorption Field Soils Data Septic Tank Absorption Fields-Rifle Area, Colorado, Parts of Garfìeld and Mesa Counties(Fratzke Residence)265m26ti502658'10265æ026æ2675¡268102658702656'10266302ffi702ì5630Map Scaþ: 1:2,950 ¡f printed on A landscape (11" x 8,5") slæd.040801æ2Ætud0 1m 2n 400 m0Map projedon: Vú€b Mercator Comer@odinates: WGSB4 E&Et'cs: UTIVI Zorìe 13N WGS84æsffi26050ffi11039. 34',21' NoxIaBRHÐqRfr39. 34 21' NEgEËIüFügQNA261105t21t2023Page 1 of5oUSDA-Natural ResourcesConservat¡on Serv¡ceWeb Soil SurveyNational Cocperative Soil Survey39.34'7"N26S0269S266050390 34',7" N USDAz-Natural ResourcesGonservation ServiceSeptic Tank Absorption Fields-Rifle Area, Colorado, Parts of Garfield and Mesa Counties(Fratzke Residence)Web Soil SurveyNational Cooperative Soil Survey5t21t2023Page 2 of5MAP LEGENDMAP INFORMATIONArea of lnterest (AOl)E Area of lnterest (AOl)SoilsSo¡l Rating Polygons! Very IimitedE Somewhat limitedI Not limitedtf Not rated or not availableSo¡l Rating Lines# Verylimitedt t Somewhat limited,æ, Not limitedt. t Not rated or not availableSoil Rating Pointsf Very limitedtr Somewhat limitedf Not limitedt¡ Not rated or not availableWater FeaturesStreams and CanalsTransportationRails,4 lnterstate HighwaysËd US Routes:tui Major Roads:Ë.ri Local RoadsBackgroundI AerialPhotographyïhe soil surveys that comprise your AOI were mapped at1:24,0OO.Warning: Soil Map may not be valid ai 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 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 d¡stance or area are required.This product is generated from the USDA-NRCS ceriified data asof the version date(s) Iisted below"Soil Survey Area: Rifle Area, Colorado, Parts of Garfield andMesa CountiesSurvey Area Data: Version 15, Sep 6,2022Soil map units are labeled (as space allows) for map scales1 :50,000 or larger.Date(s) aerial images were photographed: Aug 25, 2021-Sep5,2021The orthophoio 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" Septic Tank Absorption Fields-Rifle Area, Colorado, Parts of Garfield and Mesa Counties Fratzke Residence Septic Tank Absorption Fields Map unit symbol Map unit name Rating Component name (percent) Rating reasons (numeric values) Acres in AOI Percent of AOI J Arvada loam, 1 to 6 percent slopes Very limited Arvada (80%)Slow water movement (1.00) 33.2 78.0% 30 40 Heldt clay loam, 6 to 12 percent slopes Very limited Heldt (90%)Slow water movement (1.00) 16.1% Slope (0.04) Kim loam, 3 to 6 percent slopes Not limited Kim (85%)2.5 6.0% Totals for Area of lnterest 42.5 100.0% Rating Acres in AOI Percent of AOI Very limited 40.0 94.O% Not limited 2.5 6.jYo Totals for Area of lnterest 42.5 100.0% USDA7-Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 5t21t2023 Page 3 of 5 Septic Tank Absorption Fields-Rifle Area, Colorado, Parts of Garfield and Mesa Counties Fratzke Residence Description Septic tank absorption fields are areas in which effluent from a septic tank is distributed into the soilthrough 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. USDA = Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 5t21t2023 Page 4 of 5 Septic Tank Absorption Fields-Rifle Area, Colorado, Parts of Garfield and Mesa Counties Fratzke Residence Rating Options Aggregation Method: Dominant Condition Aggregation is the process by which a set of component attribute values is reduced to a single value that represents the map unit as a whole. A map unit is typically composed of one or more "components". A component is either some type of soil or some nonsoil entity, e.9., rock outcrop. For the attribute being aggregated, the first step of the aggregation process is to derive one attribute value for each of a map unit's components. From this set of component attributes, the next step of the aggregation process derives a single value that represents the map unit as a whole. Once a single value for each map unit is derived, a thematic map for soil map units can be rendered. Aggregation must be done because, on any soil map, map units are delineated but components are not. For each of a map unit's components, a corresponding percent composition is recorded. A percent composition of 60 indicates that the corresponding component typically makes up approximately 60% of the map unit. Percent composition is a critical factor in some, but not all, aggregation methods. The aggregation method "Dominant Condition" first groups like attribute values for the components in a map unit. For each group, percent composition is set to the sum of the percent composition of all components participating in that group. These groups now represent "conditions" rather than components. The attribute value associated with the group with the highest cumulative percent composition is returned. lf more than one group shares the highest cumulative percent composition, the corresponding "tie-break" rule determines which value should be returned. The "tie-break" rule indicates whether the lower or higher group value should be returned in the case of a percent composition tie. The result returned by this aggregation method represents the dominant condition throughout the map unit only when no tie has occurred. Component Percent Cutoff: None Specified Components whose percent composition is below the cutoff value will not be considered. lf no cutoff value is specified, all components in the database will be considered. The data for some contrasting soils of minor extent may not be in the database, and therefore are not considered. Tie-break Rule: Higher The tie-break rule indicates which value should be selected from a set of multiple candidate values, or which value should be selected in the event of a percent composition tie. USDA - Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 5t21t2023 Page 5 of 5 NIRCS Textural Triangle BASED ON REGUT-AT|ON 43 TABLE 1O-1 For Solls with Less Than 35 Percent Rock Fragments. Rock Fragments are larger than 2 mllllmeters. Soll Treatmcnt Area long Term Acceptance Rates by Soll Texture, Soll Structure, Percolatlon Rates and Treatment leuel Soll Type, Texturê, Structure and Pcrcolatlon R¡te Rante lont-term Acccptance R¡te (tTARl Gallons pcr day per square foot SollType t SOASollT.rh¡n USDASoll Stn¡ct¡lt- TlP. USDASoII strucü¡n{ndr n:t lilPll Pstolrtlon l¡vcl2t Tttlünalrtï'.ürnc|lt l¡vd 1r ïrütmglt lrnl2ilt T¡r¡lmcnt lrvrl3t lrlrd 3flr. Tnrt¡n.trt 9ndyto¡m Loem Slh lo¡m Prbñrdc 8lo*y Granular Mod.ntc Stront 16'25 I I I 0.60 1.00 1.(x¡1.10 1.10 Prlsm¡tk Blocky Granul¡r WcrkS.ndy Loaln loam Slh Lo¡m M¡3shrc Structurdcss 2æO 0.50 0.80 0.8{t 0.90 0.90 mnrüc !þCY StrrB,ht !to4r¡þ 5üùñt 0¡3É &rdyehyþ1t ëü.IÞrm_:ggga-41.60 drt¡ I I I I I 2 3 - Treatment levels are defined in Table 6.3 L _ _ _ JAreas outs¡de the dashed box require design by a professional engineer lo0 2A 3A Textural Triangle l0 2A 80 30 70 t ffir 40 Solllype 2or 2¡ {n 10 50 0 Loam Sandy [oam 100 30 60 Sand 90 00 Caliber Engineering, Inc. Soil Observation Logs Caliber Engineering, Inc. Soil Texture by Feel I P-l Soil Texture by Feel Does the soil remain in a ballwhen squeezed? Place soil in palm of hand. Add water drop-wise and knead the soil into a smooth and plastic consistency, like moist putty. Place ball of soil between thumb and forefinger, gently pushing the soil between with the thumb squeezing it upward into a ribbon. Form a ribbon of uniform thickness and width. Allow ribbon to emerge and extend over the forefinger, breaking from its own weight. hsedon U50A ilR(s Guide toïexture by ftel- S, J.nien,1979, modifu. Ihii vår¡rtion seeted by D Hanlson, M 8rcwn, W Brown, fi [awr. Yes No Add dry soilAdd water ls the soiltoo dry? Yes No the soiltoo wet? Yes No the soilform a ribbon? No What Does soilfeel very gritty? Yes No Does soilfeelvery smooth? Yes No Neither gritty nor smooth? Yes Forms a weak ribbon less than l"before breaking loam Soilïype 2 or 2A SrndyLoam SihLorn loam Forms a1-2" ribbon before breaking ffi * before 2" ol a Place soil in palm of hand. Add water drop-wise and knead the soil into a smooth and plastic consistency, like moist putty. Place ballof soil between thumb and forefinger, gently pushing the soil between with the thumb, squeezing it upward into a ribbon. Form a ribbon of uniform thickness and width. Allow ribbon to emerge and ertend over the forefinger, breaking from its own weight. 8¿¡ed on U50A llRGGuidetolexlure by k€l - S. J.Ihl€n, 1979, m0di6rd. Ihir vår¡ðtion oeåled by 0 Hanison, M Srotvqw 8rown, R taw'. TP.2 Soil Texture by Feel o€ c ,sù s 2 0 Add water Add dry soil ls the soiltoo dry? Yes No the soil too wet? Yes No Does the soil remain in a ballwhen squeezed? Yes No the soilform a ribbon? Does soilfeelvery gritty? Yes No Does soil feel very smooth? Yes No Neither gritty nor smooth? Yes Forms a weak ribbon less than l"before breaking loam SoilÏype 2 or2Â Sandy loam liltlorm Lo¡m Forms a1-2" ribbon before breaking ffi * {} a 2" or OWTS Design Spreadsheet 308 Cindys Way # Bedrooms Total Design Flows Soil Loading Rate = Soil Treatment Area = STA = Design Flow/LTAR Size Adjustment for Method of Application = Size Adjustment for Type of Distribution = 600 Ít2 Design Flow (GPD) 300 300 gpd SITE CRITERIA Soil Type LTAR 0.35 0.35 Based on Table 10.L 8s7.L4286 Í{ Size Adjustment Factors for Method of Application in STA Type of Absorption Area Method of Effluent Applcation Dosed (siphon or Pressure Gravity PumP) Dosed Trench Bed Size Adjustment Factors for Types of Distribution Media in STA Category2 Category3- Categoryl- -Other Chambersor Rock or Tire MFG Enhanced Chips Media Media Type of Absorption Area L 2 J 2^ 3A 4 4A 5 X X I o.7 Adjusted STA Size = Number of lnfiltrators = Total Length of lnfiltrators = Maximum Distribution Length = Number of Trenches = Number of lnfiltrators per Trench = ft ft 40 200 75 3 13.3333333 2 X Septic Tank Size =1000 gallons