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Home My WebLink AboutOWTS System Design Report 07.10.2017ON-SITE WASTEWATER TREATMENT SYSTEM DESIGN LOT 23, RAPIDS VIEW LANE NEW CASTLE, CO Prepared For Chronos Builders Prepared By: CAPSTONE \ ENTERPRISES WEST, LLC GEOTECHNICAL AND MINING ENGINEERING TESTING AND INSPECTION SERVICES 618 PARTEE DRIVE GRAND JUNCTION, CO 81504 PHONE (970) 250-3331 capstonewest@juno.com July 10; 2017 Job No. 4100-1 CAPSTONE ENTERPRISES WEST, LLC GEOTECHNICAL AND MINING ENGINEERING TESTING AND INSPECTION SERVICES 618 PARTEE DRIVE GRAND JUNCTION, CO 81504 PHONE (970) 250-3331 ca pston ewest@j u no. com July 10, 2017 JOB # 4100-1 Attn: -Chronos 1 -uiade.rs '637 25 Road Grand Junction, CO 81505 Subject: On -Site Wastewater Treatment System Design, Lot 23 Rapids View Lane At your request, on June 22, 2017 Capstone Enterprises West, LLC directed and observed the excavation of the test pits to evaluate onsite soils for design of an On -Site Wastewater Treatment System (OWTS). The suitability of soils was evaluated by performing a percolation test, as prescribed by the Garfield County regulations. The results of the soil evaluation and the OWTS design are presented in this report. If you have any questions, or if we may be of further assistance, please do not hesitate to contact us. Respectfully Submitted: CAPSTONE ENTERPRISES WEST, LLC Martin W. Chenoweth, PE Registered Professional Engineer MWC CAPSTONE ENTERPRISES WEST, LLC 2 JOB NUMBER 4100-2-OWTS PROPERTY DESCRIPTION The property is a 2 acre parcel in the recently developed Rapids View Subdivision located in the southwest quarter of section 4 Township 6 South Range 91 West. The following map shows the general location of the lot. Rifle The property is from New Castle Site Location 0 e outside of the Colorado River flood plain as shown in the following image taken the Garfield County GIS website. E10.1S/CA The property is essentially flat, sloping at less than 1 percent toward the north. The land had previously be -en -farmed CAPSTONE ENTERPRISES WEST, LLC 3 JOB NUMBER 4100-2-OWTS PROFILE HOLE GEOLOGY The following image shows the location of the test pits excavated to evaluate the soils at the site. The geologic logs follow the Image. 2141, 10 TP -1 Topsoil- Silty Clay Abundant Roots Reddish Brown Silty Clay w Gravel Pr=10 Sandy Gravel w! Cobbles PI =NP Sandy Gravel we Boulders Moist: Water Table 6/22/17 CAPSTONE ENTERPRISES WEST, LLC 4 JOB NUMBER 4100-2—OWTS 10 TP -2 Topsoil- Sdty Clay Abundant Roots Reddish Brown Silty Clay w; Gravel Sandy Gravel wf Cobbles Geologically, the bedrock in the area is the Molina Member of the Wasatch Formation. This unit is made up of sandstone and mudstone. At this site the bedrock has been capped with alluvial sediments from the Colorado River that borders the subdivision to the north. The sediments overlaying the bedrock change gradation from gravel with boulders to sandy silty clay. The contacts between the different soil types are quite distinct. Ground water was encountered in TP -1 at 7.1 feet below the surface. There was no evidence of a seasonal water table above this elevation. It should be noted that runoff at the time was quite high and the river was near seasonal high. PERCOLATION TEST Due to' the rocky nature of the soils in, the one selected for the absorption, it was impossible to. dig a posthole for a percolation test. Visual and tactile examination of the soils indicated that the gravel above the water table were suitable soils, the gravel's matrix was fine grain sand. Capstone performed a gradation test to assess the nature of the soils. The gradation curve is presented on the following page. Based on the percentage of rock, this absorption bed will need to be a replacement soil bed. The accepting soil has a Long Term Acceptance Rate (LTAR) of 0.8, Capstone recommends the rate be reduced to 0.5 due to percentage of rock. Table 10-1 SOiI Treatment Area LOnp4erm Acceptance Rates by Sol{ Tenter', Soil Strucl4re, Psr0Olallen Rate and Treatment Level r Len9-lerm Activism' taste SLUM; Sall Type Ta1W no Suuptae and Percolation Rate Range Gallon. per My por pone Foot Soh Type USDA Sal Texture USDA Boll Structure- Shape USDA Solt Structure- Grade Percolation Rate PVT) Treatment Lovell Treatment I Treatment Traetneok V Level 2Level aha I Level 3‘ l Treatment Level 3N' I jl _.__1- 0 , ..-.Ar.Mievp - 01a Grp) U NONIMIPIE ordeal Minimum 2-tootdeep unlined sand filter inquired? t Sano Loh,nySaee - e 5-15 0 B0 1.25 125 1.40 140 Sandy Loam Loam, Sill Loam PR (Prismatic) BK tBlechy) GR (Granular) 2 (Ia441x41P1 16-25 3 Mln>tl9l 060 0.90 0.90 100 1.00 PR, SK r Sandy Loam Loam, 015 I GR 2A 0 (none) M s�vate) 2 3 25-40 050 070 0.70 0.60 0B0 Sandy Clay Loam Clay PR, BK Loam say Cary Loam GR a1-50 0 35 0.60 0.50 0.60 O.BO Sandy Clay Loan Clay Loam, Bey Cly loam 1. B K. OR 1 Manlve 81-79 0.30 040 0.40 0.50 0-60 Bandy Clay, Clay, Biay Way PR, 2 3 75-900.20 0.30 0.30 0.30 030 Sandy Clay, Cloy, SBI' Clay Gm 0 1 Melva 01-120 0.16 0.20 020 020 020 6 soli TM* 2-4A Piety 1.2,2 121. 0.10 0-15 0.15 0.16 0.15 NOTE Shaded antes require system design b a professions eIlgWeer 1 Treatment levels are dofined in Title 0 3 2 Unlined sand filtem in (hese soil types shah provide pathogen removal Design shah conform to section 11 C.2c Unlined Sand FJlere Higher long 150050 eptance ,A. ter Treatment Levet 304 may be aheeed for OHMS regained to have a discharge paled, d the capability of the design to achieve a higher long-term acceptance rate ca' Ly sebel splinted CAPSTONE ENTERPR]SE,S WEST r LLC 5 JOB NUMBER 4100-2—OWTS 100% 80% 60% 40% 20% 0% 10 SIEVE ANai.YSIS - PERCENT PASSING Sin at pei4f !n Indira Mesh Ooenines eer Ia Of Standard S✓ m la m .i ik a COARSE FINE I COBBLES I --- Li:'e�t' I.I. Client Chronos Builders Project Lot 23 Rapids View Lane Sample Profile Hole Gravel Percent Passing 3/4 100.0% 3/8 74.0% #4 55.3% #10 41.5% #40 18.8% #100 9.6% #200 8.3% MEDIUM F1NE ..- SAND 'Gravel Sand Silt/Clay 88.2% 1Q_O% 1__8% CAPSTONE ENTERPRISES WEST, LLC 6 JOB NUMBER 4100-2—OWTS WASTE WATER TREATMENT SYSTEM DESIGN A single dwelling is planned for this site ("'2,400 square feet). The residence at this site is planned to be a four (4) bedroom dwelling. Using the guidelines In the Garfield County On -Site Wastewater Treatment System Regulations, Effective Date: June 30, 2014, (OWTSR) the following sewage flow calculations were prepared: MAIN HOUSE Base flow 150 gallons per bedroom * 4 Q =600 gal. /day Once again using the OWTSR the absorption area was calculated. Where: A = Absorption Area in square. feet Q = Design Flow of sewage in gallons/day LTAR = Long Term Acceptance Rate (From Table 10.1, OWTSR) Q 600 A = = = 1,200 SQ. FT. LTAR 0.5 Base Area 1,200 sq. ft. Size Adjustment Factors Pressurized .Bed 1.0 Chambers 0.7 Total Absorption Bed Atea 840 sq. ft. A single 12 foot wide by 70 foot long absorption bed is required. A single 1,250 gallon septic tank and a 500 gallon pump vault are required for this system. The following drawings show the general arrangement and the construction details. PUMP SYSTEM For the 70 foot long laterals with 0.25" holes spaced every 4 feet the pump must supply 90 gpm at 19 feet of total dynamic head. An Orenco Model PFSW10012-B has been specified for this application. The pump curve is presented on the following page. CAPSTONE ENTERPRISES WEST, LLC JOB NUMBER 4100-2-OWTS 7 90 4.. 80 70 p60 14 50 c, 40 30 15. 20 10 0 1 I I 1- .I__ } 1 1 d PFSW Series, 60 Hz 1.0-1.5hp00.75-1.12 kW) PFSW15012 1� 1 I I % 1 1 1 1 1 I 1 1 k 1 1 1 ' 1 I 1 1 1 1 1 1 1 i 1 1 1 1 1 r 4 r 1 1 i 1 1 1• 1 • 1 I ! ! ! 1 1 I 1 i 1 1 1 1 1 PFSW10012-B 1 1 1 0 20 40 60 80 100 120 140 160 180 Flow in gallons per minute (gpm) CAPSTONE ENTERPRISES WEST, LLC 8 JOB NUMBER 4100-2—OWTS \REV. DATE 20' [AuIt-Purpose Easement Wates s•ply 2` Ola SCH 40 PVC Manifold DESCRIPTION BY CK Repair Area NORTH 1Z5:7O' Sand Bed w/ Infiltrator Chambers 0 25 50 75 100 SCALE (FEET) CAPSTONE ENTERPRISES WEST, LLC 618 PARTEE DRIVE GRAND JUNCTION, CO 81504 PHONE (970) 250-3331 capstonewest@juno.com OMITS GENERAL LAYOUT LO`f 23 RAPIDS VIEW LANE NEW CASTLE, COLORADO BY M W CHENOWETH PROJECT NO. 4100-2 DATE 7r1n!17 SCALE ?=5a SHEET NO.' OF3 4CV10835% FOR DRAINAGE uiryh BAGffILL 123 11 i11� � 1 �1i1�1i! iy1i�� 1 I ��lifiili : 1i1li�i1i .:'1.111111 li � i ' i�'- �'_../ , 1 , , ffillffil. f °i : i iiii:14ilia idl'4jti`la .111111lSj�' V _ ILS;1 r , i n 1 )1 I iil!lul! i 1'f!l l!i it1�lil TIV IT !PM PM Krt �l�l,�il, 1 11,1!1 j I I 1 r, lit � I 1lijliligi l )' Ttti ReA :1��li rrikri 41: !i i;lll �!1l11ti� ,fi� ffllI+Tl; �f Ca'En DMAFERE M, M R.:Es Fair GrELME PPE AQ• iy FVC YEA ,AiES A6 tC E. 4" PVC ACCESS TO VENT/INSPECTION PORT ON EACH LATERAL 7AREATXD CAP PLUG -r t.tTstrcr-11'1Al'l 1Y 'i A.1 1-;'4*i'Y[-'Y"i"1$1'l*1Y'!' r1 IRfo-41A i"i -/L.114 s t61.i'S o, •P*. MMUUS . UerrIIrr rxt rrrasf 'aarlrrrrrrr rrr#rrrrr mums a I. .at — 30 STANDARD QUICK -4 INFILTRATOR CHAMBERS 4 ROWS OF 17 (68 TOTAL) 72 r SCH 40 PVC 4" PVC ACCESS TO BALANCING VALVE ON EACH LATERAL 2" BALL VALVE .\REV. DATE DESCRIPTION BY CK CAPSTONE ENTERPRISES WEST, LLC 618 PARTEE DRIVE GRAND JUNCTION, CO 81504 PHONE (970) 250-3331 capstonewest@ju no. com OWTS CONSTRUCTION DETAILS LOT 23 RAPIDS VIEW LANE NEW CASTLE, COLORADO BY M W CHENOWETH DATE 7110/17 SCALE NTS PROJECT NO. 4100-2 'SHEET NO. 2OF3 EFFLUENT IN 2% SLOPE MINIMUM Orenco Model SBEX-14 Orenco MOd:el MF3A Level Controller •,.. .• 0 4 1,250 Gallon Septic Thank Section View 2" Dia SCH 40 PVC Slope at 1% for Drainage Orenco PFSW10012-B 500 Galllon Pump Vault REV. DATE DESCRIPTION BY C CAPSTONE ENTERPRISES WEST, LLC 618 PARTEE DRIVE GRAND JUNCTION, CO 81504 PHONE (970) 250-3331 capstone west@Juno. com OWTS SYSTEM PROFILE LOT 23 RAPIDS VIEW LANE NEW CASTLE, COLORADO BY M W CHENOWETH DATE 3/17/17 SCALE NTS PROJECT NO, 4100-2 SHEET NO. 3oF3 Section: 4 Township: 6 Range 91 Subdivision:Rapids on the Colorado Lot:23 LOT- 23 TBD RAPIDS VIEW LANE THE RAPIDS Q,N THE COLORADO 06/12/2017 SCALE: 1"=60'-0"