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Home My WebLink AboutOWTS System Design Report 07.10.2017ON-SITE WASTEWATER TREATMENT SYSTEM DESIGN LOT 28, RAPIDS VIEW LANE NEW CASTLE, CO Prepared For Chronos Builders Prepared By: CAPSTONEs.. ENTERPRISES WEST, LLQ GEOTECHNICAL AND MINING ENGINEERING TESTING AND INSPECTION SERVICES b48 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 capstonewest@juno.com July 10, 2017 JOB # 4100-1 Attn: Chronos Builders '637 25 Road Grand Junction, CO 81505 Subject: On -Site Wastewater Treatment System Design, Lot 28 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 4100-1-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 1pcation of the lot. Rifle Silt o : e New Castle Site Location The property is partially located in the Colorado River flood plain as shown in the following image taken from the Garfield County GIS website. However, site grading may have changed the actual location, as the owner has been told. The property is•essentially flat, sloping at less than 1 percent toward the northwest The land had previously been farmed CAPSTONE ENTERPRISES WEST, LLC 3 JOB NUMBER 4100-1-OWTS PROFILE HOLE GEOLOGY The following image shows the location of the test pits excavated to evaluate the soils at the site. The•geofogic lags_ follow the. image. TP -2 • 71.6161v5F07i1 • TP -1 TP -1 Topsoil- Silty Clay Abundant Roots TP -2 Reddish Brown Silty Clay wi Gravel PI = 10 Sandy Gravel wf Coboles PI=11P Sandy Gravel wi Boulders Water Table 6/22117 CAPSTONE ENTERPRISES WEST, LLC 4 JOB NUMBER 4100-1—OG+TTS Topsoil- Silty Clay Abundant Roots Reddish Brown Silty Clay wJ Gravel Sandy Gravelwi 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 8.0 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 -zone .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, Capstonerecommends the rate be reduced to 0.5 due to percentage of rock. Table 10-1 Solt Treatment Area LOnp-lerrm Arceptence Rates by Soil Texture.Soli Structure, Percolation Rate and Treatment Level L000 -lane Acceptance Rale (LTAR); Gallons pm day per wanner fool USDA Sea USDA Soil Soil Structure- Shushan- Rnocielren Treatment Treatment 1 TrealmeM Treatment i Treatment Typo USDA SWI Temkin, Shape Grade Rab taro) L0811' Level 2' Level ita' I Level 3' Level 314'• Sall Type, Tesoro. 510800 a Ane Pensioner! Rab Renee 2A Sandy Loam Loam, S Loam 0 (Shoo Greif) PR IPrel mahc� BK i lr oderst 0 1 8006y1 31S1m090 GR (Granular) <5 5-15 /CAM r 1.41110804, 080 Sandy Loam Loam. Sit PHHK Loam GR 0 (none) Sandy Clay Loam Clay Y P11. 811. Loam 80y Clay Loran GR 1 (Week) Massive 2, 3 16-25 060 Minimum 2.Ioot deep unlined sand fiber required 1 25 1.25 1.40 140 0.90 000 1.00 1.00 0 50 070 0.70 0 80 0 80 035 0.60 050 060 0.80 Seedy Coy Loam Clay Loam, 810y Clay Loam Scaly Cly. Clay, Slay Coy PR. BK OR PFt BK OR plea 81-15 0.30 040 0.40 050 0.00 2,3 76x0 030 0.30 0.30 030 Sandy Cloy , Silly OR lley 0 91-120 0 16 020 0 20 020 0.20 5 SWI Types 2-4A Platy 1,2.3 NOTE Shaded areas require system design by a professions engineer Treatment levels are defined in Tante 6-3 1 2 Unlined sand eller in these soil types shall provide pathogen removal Design siva conform to section 11 C 2 c Unlined Sand FAlere Higher long-term acceptance rales for Treabnenl Level 3N may be allowed for OWES required to have a discharge pamd. i the capability of the design 10 achieve a higher tong -term acceptance rale can be substantiated 121+ 0,10 0.15 0.15 0.10 0 15 CAPSTONE ENTERPRISES WEST, LLC 5 JOB NUMBER 4100-1—OWTS 100% 80% 60% 40% 20% 0% SIEVE AN YSIS - PERCENT PASSING Ina, Cp bird= US Standard tvc N m ry w tD tl' � ti m 10 II COBBLES COARSE GRAVEL D.1 001 FINE COARSE MEDIUM FINE SAND Client Chronos Builders Project Lot 28 Lipids View Lane Sample Profile Hole Gravel Percent Passing 3/4 100.0% 318 68.0% #4 50.1% #10 39.1% #40 14.2% #100 6.0% #200 4.2% Gravel Sand Silt/Clay 82.0% 16.5% 1.5%. CAPSTONE ENTERPRISES WEST, LLC 6 JOB NUMBER 4100-1-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 Area 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 Tong 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 4100-1-OWTS Total dynamic head (TDH) in feet 90 80 70 60 50 40 30 20 10 0 1 1 t.-t_,_ = 1 1 1 1 1 1 J 1 1 1 1. 1. € 1 PFSW15012� ! I 1 1 1 PFSW Series, 60 Hz 1.0 - 1.5 hp (0.75 - 1.12 kW) 1 1 1 11 I 1 1 I 1 1 1 1 i I 11 1 i 4 ! -, - • T 11 tt 1 1 1 1 1 1 ! 1 1 1 1 PFSW10012-B -r 1..-_ .1 -..- r 1 -1 r 1 1 -r -1 1 - r 0 20 40 60 80 100 120 140 160 180 Flow in gallons per minute (gpm) CAPSTONE ENTERPRISES WEST, LLC JOB NUMBER 4100-1-OWTS 8 \REV. w t P y NORTH 1,250 Gal 5 500 Gal Pu 2" Dia SCH 40 PVC Manifold 0 25 50 75 100 SCALD; (FEET) 12'x70' Sand Bed w/ Infiltrator Chambers TP -1 Repair Area DATE DESCRIPTION BY CK CAPSTONE ENTERPRISES WEST, LLC 618 PARTEE DRIVE GRAND JUNCTION, CO 81504 PHONE (970) 250-3331 capstonewest@Juno. com OWTS GENERAL LAYOUT LOT 28 RAPIDS VIEW LANE NEW CASTLE, COLORADO BY M W CHENOWETH DATE 7/10/17 SCALE 1"=50' PROJECT NO. 4100-1 !SHEET NO. 10F 3 '2d 4OUH131353%. FORDRAINAGE 4' PVC ACte56 TO VEN 11NSPECTION PORT ON EACH LATERAL THREADED CAP PtLJ -'111rt�[-Sri'i"i•'l"i'-!•l=-l*f-l"i-'i l•ii'!t•l�l�/�k�l-f-lel-i-i*i'1'�"i�f i�l'�3h'l�l �F 3-i�l i.11 F! G-, �✓'' Vi tip``•.'Pry ▪ a�2:�.'�▪ t?,,v.- v5'�eb_ '(...y~�^.ai�y,,f��Va� \�.�, y,.y� t s4•Snb�i.S• .7.�i� r-�' "'"' . .yyi�L• "C SS{►.' 1 !�,• y 1. - ,� Aii STAN'DAko ourAl RA?OR CHAMBERS 4 ROWS OF 17 (68 TOTAL) 72 7SCH 40 NC 4' TVC ACCESS 10 6ALANCi#G VALVi_ ON EACH LA =RAL T' 8 U. VALVE `REV. DATE DESCRIPTION BY CK CAPSTONE ENTERPRISES WEST, LLC 618 PARTEE DRIVE GRAND JUNCTION, CO 81504 PHONE (970) 250-3331 capstonewest@juno.com OWTS CONSTRUCTION DETAILS LOT 28 RAPIDS VIEW LANE NEW CASTLE, COLORADO BY M W CHENOWETH DATE 710/17 1 SCALE NTS PROJECT NO. 4100-1 (SHEET Na, 2OF3 2" Dia. SCH 40 PVC Slope at 1% for Drainage Orenco Model SBEX-14 ,n4aapt. C Orenco Model MF3A Level Controller 1,250 Gallon Septic Tank REV. DATE Section View Orenco PFSW1 500 Galllon Pump Vault DESCRIPTION BY CK CAPSTONE ENTERPRISES WEST, LLC 618 PARTEE DRIVE GRAND JUNCTION, CO 81504 PHONE (970) 250-3331 capstonewest@juno.com OWTS SYSTEM PROFILE LOT 28 RAPIDS VIEW LANE NEW CASTLE, COLORADO BY M W CHENOWETH DATE 3/17/17 SCALE NTS PROJECT NO. 4100-1 SHEET NO. 3oF3