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Home My WebLink AboutSubsoil Study - OWTSrcÄm,mm;ffü'-"5020 Counly Road 154 Glenwood Springs, CO 81601 phone: (970) 945-7988 fax: (970) 945-8454 email : kaglenwood@kumarusa.com www.kumarusa.com Terry Thompson 233 Vaquero Road Carbondale, Colorado 81 623 ten y f@ thomp s o nfr am er. com Project No. 21-7-901 Subject: Subsoil Study for Septic Design, Proposed Residence, Lot 14, Callicotte Ranch, Sopris Lane, Garfield County, Colorado Dear Terry: As requested, Kumar & Associates, Inc. performed a subsoil study for design of a septic system at the subject site. The study was conducted as additional services to, and in accordance with, our agreement for geotechnical engineering services to you dated December 1,2021. The data obtained and our recommendations based on the proposed construction and subsurface conditions encountered are presented in this report. Proposed Construction: The proposed septic field will be located east of the proposed residence and driveway. The ground surface in the septic field is sloping down to the south at a grade of about 3 and 4 percent. Vegetation consists of grass and weeds. Subsurface Conditions: The subsurface conditions at the site were evaluated by excavating two exploratory pits at the approximate locations shown on Figure 1. The logs of the pits are presented on Figure 2. The subsoils encountered, below about 1 foot of topsoil, consist of 3 feet of sandy loam overlying loamy sand with cobbles down to the maximum explored depth of 8 feet. Results of a gradation analysis performed on a sample of loamy sand (minus 3-inch fraction) obtained from the site are presented on Figure 3. No free water was observed in the pits at the time of excavation and the soils were slightly moist. The proposed septic field area appears to be suitable for a septic absorption area. If you have any questions or if we may be of further assistance, please let us know. Respectfully Submitted, Kumar & Associates, Inc. Daniel E. Hardin, P.E. DEH/kac attachments Figure 1 Figure 2 Figure 3 - USDA Gradation Test Results Cc: Boundaries Unlimited - Adam Leach (adarn(gbu-inc.com) An Employcc ûrnçd Co'mpony Offìce l.ocations: Denver (HQ), Parke¡ Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado May 12,2022 RECEIVED rr r ll ¡l :.: ! GARFIELD COUNTY COMMUNITY DEVELOPMENT I T PP.1 PP-z 4/ ^¡ LOT 4 /- -' / \.-'v\I -+(\\ 25 50 APPROXIMATE SCALE_FEET BÌ \ \ \ \ 21 -7 -901 Kumar & Associates LOCATION OF PROFILE PITS Fig.1 I PP- 1 EL. 6748' PP_2 EL. 674s.s' 0 0 I F t¡JtdtL I-F o_ t¡JÕ I Fl! t¡J LL I-t-- o_ L¡Jô Ã GRAVEL=29 SAND=48 SILT=30 CLAY=3 5 I I 10 10 LEGEND TOPSOIL, ORGANIC SANDY CLAY, GRAVELLY, FIRM, MOIST, DARK BROWN sAND (SC): CLAYEY, SILTY, MEDIUM DENSE, SLIGHTLY Mo|ST, BROWN. GRAVEL (OC-CV): SANDy, StLTy W|TH COBBLES, DENSE, SLIGHTLY MOIST, WHITISH TAN GRAVEL (GM): SANDY SILTY WITH COBBLES, SLIGHTLY MOIST, YELLOW/TAN. t DISTURBED BULK SAMPLE NOTES 1. THE EXPLORATORY PITS WERE EXCAVATED WITH A BACKHOE ON MARCH 28, 2022 2. THE LOCATIONS OF THE EXPLORATORY PITS WERE MEASURED APPROXIMATELY BY PACING FROM FEATURES SHOWN ON THE SITE PLAN PROVIDED. 3. THE ELEVATIONS OF THE EXPLORATORY PITS WERE OBTAINED BY INTERPOLATION BETWEEN CONTOURS ON THE SITE PLAN PROVIDED. 4. THE EXPLORATORY PIT LOCATIONS AND ELEVATIONS SHOULD BE CONSIDERED ACCURATE ONLY TO THE DEGREE IMPLIED BY THE METHOD USED. 5. THE LINES BETWEEN MATERIALS SHOWN ON THE EXPLORATORY PIT LOGS REPRESENT THE APPROXIMATE BOUNDARIES BETWEEN MATERIAL TYPES AND THE TRANSITIONS MAY BE GRADUAL. 6. GROUNDWATER WAS NOT ENCOUNTERED IN THE PITS AT THE TIME OF EXCAVATION 7. LABORATORY TEST RESULTS: GRAVEL = PERCENT RETAINED ON NO. 1 0 SIEVE SAND = PERCENT PASSING No. 10 SIEVE AND RETAINED ON N0. 525 SIEVE; SILT = PERCENT PASSING NO. 325 SIEVE TO PARTICLE SIZE .002MM; CLAY = PERCENT SMALLER THAN PARTICLE SIZE .002MM. 21 -7 -901 Kumar & Associates LOGS OF EXPLORATORY PITS Fis. 2 SIEVE ANALYSISHYDRON/ETER ANALYSIS TIME READI U.S, STANDARD GS 5" 6"24 HR. 7 HR l MIN, #325 +140 #60 #35 #1A #10 #4 3/8', 3/4' 1'U2'8' 045 MIN.100 10 / t 90 20 80 30 70 o t¡Jz.aF tJJ É. FzblOÉ LJo- 40 60 ()z U''ln ù Fz L.l() É. L¡l o- 50 50 40 70 30 80 20 90 10 100 106 .025 .500 1.00 2.00 4.75 9.5 19.0 37.5 76,2 152 203.001 .002 .005 .009 .019 .045 DìAIVETER OF PARTICLES IN MILLIN/ETERS CLAY COBBLES GRAVEL 29 %SAND 48 %SILT 20 %CLAY 3 7" USDA SOIL TYPE: Loamy Sand FROM: Profile Pit 1 @ 5.5' V FINF FINE SAND N,lEDIUM COABSESILT 21 -7 -901 Kumar & Associates USDA GRADATION TEST RESULTS Fig.3 ril ;ft lrlhl¡flHrlüil!ÉtTriltHrFilfhtufftü I iltRecc¡tlonË: T?flSiZz 0911ò128Æ7 lO:39:ES ßll Ð¡1926 P3ø661 J..n n¡b.r¡co35 ol 38 Rco F¡r:Slei,00 Doc Ftt¿O,@ cnRFtELD Col¡{fY C0 IIIÍDIVIDUAL SEPTIC DISPOSAL SYSTDM PLAN FOR CALLICOTTE RANCH STJBDTWSION Thc Callícotle Ranch Subdivision is located in lot 17 and the SlVl/4SWl/4 of section 13, the hn¡Yl/4 and the NlVl/4Slül/4 of section 24,T.7 S., R.88 W. of the 6¡t¡ P.M. County of Garfield State of Colorado. This subdivision will be served by Individual Sewage Diqposal Systems (ISDS) since the lot sizes are consistent with the Garfield County Zoning Resolution. ISDS desigrr, installatio¡r, and maintenanco will bc thc responsibility ofttre individuål lot owner. Percolation tests and soil profile evaluations must be done in accorda¡¡ce witb local regulations prior to ind¡vidual designs. ISDS designs are required by a State of Colorado licensed profæsional engineer for percolation tests rezults with a value ofless than 30 minutes per inoh. The install¿tion will be inspected and certified by a profæsional enginecr registered in the State of Colorado and/or his representative. Mai¡tenance shall be performed by a liccnsed contractor in the Sùate of Colorado engaged in tbe business ofcleaning and maintaining ISDS systems. Callicotte Ranch Subdivision is located in Garfield County. Any ISDS questions or concenu¡ should be direcæd to Garfield Cormtyrepresentatíves and Garfield County code should be referenced. Garfield County cottact i¡formation is: Garfi eld County Building 108 8th Sûeet, Suite 200 Glenwood Springs, Colorado 8160I (970) 94s-w2 INTRODUCTI9N An Individual Sewage Disposal S¡rstem (ISDS), also referred to as a "scptic system'r, receives waste water and solids from a building's plumbing facilities þathrooms, kitcbens, shower, laundry), Feats, and then disposes of the efluent from this waste, by permitting it to absorb into the natural soils within the lot. "Treaünent" is accomplished by bacterial action in tbe "septicn or "teatnent" tanlq and by bacteria within the soil surrouoding tbe effluent absorption system, the "d¡ain-field." This bacterial actiou is needed to reduce the level of patlrogens in the efluent discharges from the waste system into tie soil. The principal componenls of a private on-site waste disposal system usually include the fotlowing:ó pipinÉ r ScPtic Tankr Effluent Filterr AbsorptÍon Field However, many variations on this general scheme arc used and speoial equipment and numerous systems can be designed and utilÞed for problem or difficult sites. AccordÍng to the geotechnical r€port moderately expansive clays exist tluoughout the I il'tiüt] htf¡fltìl,tlftu ] il ' t33'":¿?fãr't¡F îÈli"åtûrn, subdivision. Expansive clays are not favorable in ISDS design due to high percolation tests. Percolation tests are determincd by the amount of time moisture is able to flow througlr the soil. High percolation test results, more time ít takes for moisture to flow ttrough the soil, results in more arearequired for the ISDS design. HOI'SEÌIOLD USE Your septic qystem is designed to handle human \Âraste, toilet paper and water Èom plumbing fixtu¡es such as toilets, baths, and sinks. Household cleaners, detergeuts and bleach will not damage your Ð¡stem if used in moderation- Howevcr, biodegradable and environmentally friendly soaps, detergents and other products are rocommended. If your septic field is inundated with harsh chemicals or overloaded w¡th detergents and soaps, your septic system function may be irnpaired or ñeld failure may oscur. Never pour oil, cookiug grease, paint, or insecticides into your plumbing qystem. These items can inh¡bit the bacteria which are so critical to the proper ñrnctioning ofyour system and/or plug the pores ofyoru system. Non-degradable paper products, such as diapers, sanitary uapkins or tampons, and paper towels are ha¡mfi¡l to your system. Also refrain Êom intoducing any other non-biodegradable substances such as condoms, plastic baggies, plastic film-wrap, or cigarette butts. These items can cause serious cloggingproblems. A garboge diqposal ca¡ be used if your septic system was desigr¡ed around it; bowever, you should bave your tank punped more frcquently if large particles are present within the effluent, Your system is also desigped to handle a cøtain volume of water. If you consisteirtly overload your sqrtic system, youwill causs prcmature failure. A frequent souÍce of overload is leaking plurnbing fixtt¡res and water heatment systems. Î¡is can amount to hundreds of exha gallons of water going inûo your sepic system each month. Leaks should be repaired imrnediately. Other home recommendations for reducing wäste$tater flow are; installing water-saving devices in your shower heads and faucets and lowering the arnount of water hitting the system from the laundry by spreading your weekly washing over several days rather than doing it all within ¿ short time period. sEPrrc r$YK The bacteria that th¡ive ín a sçtic tank a¡e called "anaerobic bacteria" becaue they do not requir-e oxygen. Thesq bacteria are çsgential to the ploper fi¡rctioning.p__fa-nçp_lic sysler-n as they degrade and decompose the solids. lVhen too much solid material accuruulates in the tank over a period of years, it begins to wash out of the tank and into the drain-freld with the ¡ormal liquid effluent. The solids clog the drain-field absorption mtes into the natural soils a¡e reduced. As more solids flow from the tank, the drain-field will eventually not be able to absorb thc liquid effluent and the drain-field wil fail. This is the most com¡non cause of d¡ain-field failure. Your drain field should have monitoring wells located at the far end of the field. These wells can help detect or prcvent a field failure prior to its occuncnce. A professional field mainænance company should be scheduled for regular rnaintenance and well monitoring. It is suggested tbat t_|ililt |rlH+ßHtttstRoecption$: 723322 8E'l''ã8%l'¡33 I t?'fl,B ril tûrr lrlïlÍf iFlt lfll¡:ltrïlütr l*il:lllf t¡iûitl'¡ tl ll I Rccepflonfr: TZ\Aæø5t1d¡zøD7 1D:99¡05 Êll 8,1926 Ps068!! Js¡¡-âlblrlco -.. -.ã7- ói' 5ã-n¡o-F-ãi aigï. 06 Doc Fró t0.00 GRIFIELD golJMlY co you have your septic tatrk pumped every 2-3 years on a regular maintena¡ce schedule. DRAINTTELD AREA The draindeld is ideally located in a sunny opËn areafor nÐdmum evaporâtion. Trees a¡d shrubs should not be planted near the drain-field at¡ root infusion may impaír the dnin-field. Any plants that do not have deep rools can be planted over a drain-field. Grasses and ground cover provide the highest level of evapo-transpiration (the uycle of plants taking moisture fun the soí by their root systuns and giving it offto the aünosphere using the sun's energy) without the complication of root systems cloggíng drainpipes and gravel beds. Mulched a¡eas of flower beds do hold moisture and decrease drain-ñeld efficiency. Wallaruays, patios, parking area¡¡, decks or otl¡er permanent sEr¡ch¡res should not be const¡rrcted over either the septic tank or the drain-field. Vehicle taffic should be kept offof the drain.field and heavy ürrckslequipmant should be kept a minimum of I0 horizontal feet away ûom the d¡ain-field area. Hearly vehicles cau cause the drain-field to collapse. Rainr¡¡ater or other drainage water should be diverted from the draÍn-field area. The d¡ain-field is designed to meet the capacþ of waste water coming fiom the house. Additional water from poor drainage may cause premature field faihue. Livestock should not be allowed on the ISDS due to compaction and comPonent damage concems. l. Mi¡imum llorizontal Distanceg ProperfUnes, dnln lilles. Piped, Llned or ¡nlrmiltent lrloallon Dleh lrlgallon Dltch or Slrèâm Lake, Waler, Gour3e, Dry Guldres Soplic Tant¡Supply ClBlem Ddnltlng Wâtsr Drælllng Ocqpied Bulldino Sprlru Wells. Sucllon Llnes Supply Llne ûlnklttg Wale¡ 50 25 620101002525 Absorpllon T¡anch, Seopage 8ed, Sand Flller, SuÞ sudecE DispEmal SyÊþm o¡ Drìfi¡ell 25 b2A25501005025Seepase Pil 25 10 51025151060 Uñed ËvaporlransPlnllon Fþld orUnedWaslenaler Pool 25 l5 1025151010025 Unllned or Pårl¡a¡ly Llned Ëvaporlransplrallon Syslem Walerratcr Pond, or Surlace DlrposalSPtem 25 10 5l510601025Llned Ssnd Fllter 1015t025152525100 UnllnEd Sand h So¡lW¡h a Perc Rale Slq¡rerlhan 60 mìnuteg oerinclt 10125102510100l050D¡sporssl Syslem Uslng Å¿rosol Melhod l0 25 1025l55010VaultP¡iw 50 l0Ã10501025 SepllcTsnh, TrÞslment Planls, Doslng Tanke, VâUIlg 0 t0 50 1050f025Bulldlng Sower or Eflluenl Llnes Illl ifp¡ l¡Ilt{ijl_r¡,ll¡l!{il1þl,LillûllfJlJilfiiú ll ll IR¡ce¡tlon$r 72:t322 3E'å"?39%1"ÊS i8ï'1T,å't33u'3å?t:ä"'si+îêl8"åEflnny co OPERATION AND MAINTENA¡TCE OF ISDS A, ResponSibili$: The Callicotte Ranch Owners Association, Inc. shall be responsible for collectíng funds, and hiring a reputable service company to maintain the ISDS systems for all of the individual homeowners within the subdivision. This company will be required to inqpect and maiutain (including pumping of the septic tanþ ifnecessary, but such pumping shall be an additional eTpense charged to that Lot) 1/3 of lhe sylems each year so as to provide maintenance for each índívidual system every tbree years. The owner and the parfy ín possession of rcal property upon which an individual sewage disposal system is used, shall remain jointly and severally responsible for operation and maintenance of the system, beyond the periodic inspection provided by the Homeowners Association. B. Mainte¡ance and Cleaning: The selected sen ice company shall be required to inspect the Ðptems for acceptable operatior¡ punp the septic tanlcs (if required), and veríff the local and state regulatiors are being met with the inspected systems. Routine maintenance and pr"nping of tbe septic tanks ìrìtill be paid for by the homeowners assoäation. Other required repairs to individual systems will be the requirement of tt¡e individual homeowner. The owrier ofan individual sewage disposal system shall uoti$ the losal bealth deparünent oa any proposed sSrteur modifications prior to making ttre changes, and sball have the system approved once the modificatio¡¡s a¡s complete. C. Disoosal of WasteMaterials: Disposal of waste rnaterials ¡emoved from a system in the process of maintenance or cleaning shall be accomplÍshed at a site approved by local county officials i¡ a manner which does not create a hazard to the public healtb, a nuisance or an rmdue risk of pollution and whish complies with state and local rules and rcgulations. D. N,o Pippharge islermitted WhichDoes not Comelv Witlr Rules and Regulations: No sewage or effluent shall be permitted to be díscharged into or upon the s¡rface ofthe gound or into state waters unless the sewage system and effluent meets the minimum requireruents of applicable rules and regulatíons. E. Terrnination ofUse of-SJstem: The contents of a septic tanlc, vault, or seepage pit, the use of which has been terminated, shall be properly disposed of whereuponthe emptied tanh vault, orpit shgll be filled with soit orrocþ orthe health ofücer may require the tank or vault to be removed and disposed of properly. SUMMARY ISDS systems are a good alternative to homeourners who do not have access to a comnlrnity se$,age disposal system. V/ith the propermonitoring and maintenance of your ISDS system, mayyears of trouble free fi¡nctioning can b€ båd out of your ISDS system.