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Home My WebLink AboutREVISED OWTS Design Report 07.14.20201 Design Calculations For Lisa Locke On-site Wastewater Treatment System 329 County Road 216 Rifle, Colorado July 14, 2020 CIVCO Engineering Inc Civil Engineering Consultants Vernal, Utah 1256 W. 400 5. Office: 435-789-5448 P.O. Box 1758 Fax: 435-789-4485 Vernal, UT 84078 www.civcoengineering.com CIVCO Engineering, Inc. PO Box 1758, Vernal, UT, 84078 Ph; (435)789-5448 Fx: (435)789-4485 Referenced Calculations Description LOCKE RESIDENCE 329 County Road 216 Rifle, Colorado OWTS SIZING Page 1 By: WK Date: 07/14/2020 Chk'd: vvk Date: 07/14/2020 Section contains calculations sizing the components of the On-site Wastewater Treatment System. Design Standards Garfield County Resolution 2018-36 GCR Site Investigation Thursday, March 5, 2020, a backhoe excavator was used to dig an 8 -foot deep profile hole near the proposed location of the Locke on-site wastewater treatment system (OWTS) soil treatment area. The profile hole supplements a previous profile hole that was excavated near the soil treatment area in early February, 2020. Graphic logs of both profile holes are shown in the construction drawing for the OWTS. No standing water, nor evidence of previous groundwater level, was encountered in either profile hole. Percolation test locations were also prepared and presoaked on Thursday, March 5, 2020. Percolation test holes were 8" in diameter and 12" deep below the presumed infiltrative surface at 2' below ground level. Percolation tests were perfomed on Friday, March 6, 2020. The percolation test data is tabulated on Sheet 2 of this document. A survey of the subject property was performed by Bookcliff Survey Services in 2016. The survey noted features of the property including existing wells, existing water spigots, and property boundaries. The graphic portion of that survey's documentation is presented in the construction drawing for the OWTS. Minimum clearances per GCR Table 7-1 are represented on the construction drawing for features nearest the proposed OWTS. According to Google Earth data, the property slopes east to west at approximately 6% in the vicinity of the proposed OWTS. OWTS SIZING.mcdx CIVCO Engineering, Inc. PO Box 1758, Vernal, UT, 84078 Ph: (435)789-5448 Fx: (435)789-4485 LOCKE RESIDENCE 329 County Road 216 Rifle, Colorado Number of Bedrooms Nbed:= 5 Perk Test Results: OWTS SIZING Page 2 By: WK Date: 07/14/2020 Chk'd: wk Date: 07/14/2020 Minutes Elapsed Test Hole 1 Test Hole 2 Test Hole 3 Water Level Drop (in.) Perk Rate (Min./In.) Water Level Drop (in.) Perk Rate , Min ./in,j Water Level Drop (in.) Perk Rate (Min .nn.) 30.00 1.0625 28.24 2.125 14.12 1.8125 16.55 60.00 0.75 40.00 L75 17.14 1.8125 16.55 90.00 0.75 40,00 1.125 26.67 1.1875 25.26 120.00 0.6875 43.64 1.0625 28.24 1.5 20.00 150.00 0.5 60,00 1.125 26.67 1 30.00 180.00 0.75 40.00 1.0625 28.24 1.1875 25.26 210.00 0.75 40.00 1 30.00 1.0625 28.24 240.00 0.5625 53.33 1 30.00 1 30.00 Hole Perk Rate: 53.33 30.00 30.00 Ave. Perk Rate: 37.78 SEPTIC TANK Required Tank Volume Vtank:- if Nbed<3 ( 1000 . g4 else = 15 00 gal I000•gal+(Nbed-3)•250•gal) [GCR TABLE 9-1] First Compartment Volume 165t comp Vtank - 750 gal 2 SOIL TREATMENT AREA Design Flow Q:= OWTS SIZING.mcdx [GCR 43.9.6.4.a] if Nbed< 2 - 600 ga/ [GCR Table 6-1] day 300 gal day else if Nbed= 3 450 gal day else if Nbed> 3 450gal +0/1„,,--3) 75 �y CIVCO Engineering, Inc. PO Box 1758, Vernal, UT, 84078 Ph: (435)789-5448 Fx: (435)789-4485 LOCKE RESIDENCE 329 County Road 216 Rifle, Colorado Long-term Acceptance Rate (LTAR) OWTS SIZING Page 3 By: WK Date: 07/14/2020 Chk'd: vvk Date: 07/14/2020 gal Perk Rate t:= taue- 37.78 min Type 2A soil.... LTAR:= 0.5 day - ft2 [GCR Table 10-1] in Unfactored Soil Treatment Area STA:- a- 1200 ft2 LTAR Soil Treatment Area (Factored for Trenched Chambers)... Application Method Size Adjustment Factor.... SAFAM:= 1 .0 (gravity) [GCR Table 10-2] Distrib. Media Size Adjustment Factor 5AF0M:=O.7 (chambers) [GCR Table 10-3] Cumulative Size Adjustment Factor.... SAF:= if SAFAM• SAf M> 0.5 =0.7 13 SAFAM • SAFoM else 0.5 [GCR 43.10.D.3] Trenched Chambers Soil Treatment Area 5TATc:= SAF• STA= 840 ft2 REQUIRED SOIL TREATMENT AREA (SQ. FT.) = 840' NUMBER OF CHAMBERS PER ROW NUMBER OF ROWS IN SOIL TREATMENT AREA 1 2 3 4 5 6 7 CHAMBER MAKE &MODEL INFILTRATOR INFIL4 FLUS QUICKMINIMUM EFFECTIVE CHAMBER WIDTH (INCH) = 32 EFFECTIVE CHAMBER LENGTH (INCH) = 48 TOTAL CHAMBER LENGTH (FEET) = 315 -- - -- 20 16 14 12 ADS BIODEFFUSER EFFECTIVE CHAMBER WIDTH (INCH) = 32 EFFECTIVE CHAMBER LENGTH (INCH) = 75 MINIMUM TOTAL CHAMBER LENGTH (FEET) = 315 -- -- -- 13 11 9 8 OWTS SIZING.mcdx LEGEND Gas Service Irrigation Telephone Pedestal Utility Stub Wafer Service Well A 0 O 10.0' yot 88°4421" Yi 4 Rebar and Gap r 2 m to m 37 215.00' J r No. 36572 LS 21To. 19598 Building Setback .0' Drainags-& Utility — Easement F. Electric Panel Building Setback Buried Telephone Line Electric Transforrner—.,.,rl et -Fence-,, O 0 Cn< O? P� 43'O P� vsts 10.0' 10.0`—r1 18.1' s 61.8 Shed 10.0' Drainage & Utility /Easement 20.0' Drainage & Utility _ f Easement Stone Fireplace Rebar and Cap N 88°44'22" E LS No. 36572 County Road No. 216 wv WaterSpigot Q -Gr 215.00' Rebar and Cap LS No. 36572 —100' Drainage & Utility Easement VICINITY MAP 1" = 60'-0" SCALE: 1#-= 60' WASTEWATER TREATMENT SYSTEM COMPONENT LIST A. SEWER LINE 4'0 UNPERFORATED PLASTIC ASTM STANDARD D 3034 OR BETTER. GRADE AT 2% OR GREATER (NO MORE THAT 4% WITHIN 5 FEET OF SEPTIC TANK INLET). BED IN LOOSE GRANULAR MATERIAL, FREE OF STONES, CLODS, FROZEN SOIL. OR OTHER DELETERIOUS MATERIAL. /1'\ B. SEPTIC TANK t15QQ GALLON CAPACITY w. GALLON (MIN.) 1st COMPARTMENT. MUST BE BE LISTED ON THE COLORXbd DEPARTMENT OF PUBLIC HEALTH AND ENVIROMENT WATER QUALITY CONTROL DIVISION'S 'ACCEPTED SEPTIC TANKS FOR USE IN COLORADO ON-SITE WASTEWATER TREATMENT SYSTEMS' DATED 1/3/2019. PROVIDE TUF-TITE EF -4 (OR EQUAL) EFFLUENT FILTER. INSTALL PER MANUFACTURER'S SPECIFICATIONS. C. DISTRIBUTION BOX OUTLET INVERTS AT LEAST 1" LOWER THAN INLET INVERT. PROVIDE ACCESS WITH MANHOLE RISER AND LID TO SOIL SURFACE. D. SOIL TREATMENT AREA FOUR ROWS 073_ADS3BIODIFFUSER CHAMBERS, OR PER THE FOLLOWING TABLE: /i E. INSPECTION PORT 4"0 VERTICAL PLASTIC PIPE TO BOTTOM OF TRENCH. PERFORATE BOTTOM 12 INCHES. PROVIDE THREADED CAP AT TOP. TOPSOIL FIRM SANDY LOAM w/ LIGHT CLAY TYPE 2A PROFILE HOLE #1 TOPSOIL FIRM SANDY LOAM w/ LIGHT CLAY TYPE 2A PROFILE HOLES 6'-0" 1/4" = 1'-0" MAX. BACKFILL SUITABLE \FOR VEGETATION v ' MIN. CHAMBER 0 ti H NUMBER OF CHAMBERS PER ROW NUMBER OF ROWS IN SOIL TREATMENT AREA 1 2 3 4 5 6 7 CHAMBER MAKE & MODEL INFILTRATOR QUICK 4 PLUS EFFECTIVE CHAMBER WIDTH (INCH) = 32 EFFECTIVE CHAMBER LENGTH (INCH) = 48 MINIMUM TOTAL CHAMBER LENGTH (FEET) = 315 -- -- -- 20 16 14 12 ADS BIODIFFUSER EFFECTIVE CHAMBER WIDTH (INCH) = 32 EFFECTIVE CHAMBER LENGTH (INCH) = 75 MINIMUM TOTAL CHAMBER LENGTH (FEET) = 315 -- -- -- 13 11 9 8 E. INSPECTION PORT 4"0 VERTICAL PLASTIC PIPE TO BOTTOM OF TRENCH. PERFORATE BOTTOM 12 INCHES. PROVIDE THREADED CAP AT TOP. TOPSOIL FIRM SANDY LOAM w/ LIGHT CLAY TYPE 2A PROFILE HOLE #1 TOPSOIL FIRM SANDY LOAM w/ LIGHT CLAY TYPE 2A PROFILE HOLES 6'-0" 1/4" = 1'-0" MAX. BACKFILL SUITABLE \FOR VEGETATION v ' MIN. CHAMBER 0 ti H PROFILE HOLE #2 r PERK IRATE: 21.7 MIN. / IN. INF. SURF. TYPICAL TRENCH (COMPONENT 'D') 1/2" = 1'-0" 0 co W cc Revision Description Bedroom increase. +1 M r? N up 0 o O m PROFILE HOLE #2 r PERK IRATE: 21.7 MIN. / IN. INF. SURF. TYPICAL TRENCH (COMPONENT 'D') 1/2" = 1'-0" 0 co W cc Revision Description Bedroom increase. Rev. Date 07/14/2020 N ft r co 00 rn co 0 00 M O Ni - _c U Dat� ? 00 c ea 1- > Ln O 00 _> in S X M O 3 m 1- .05O d O 0 H 0 0 0 J Vi J O N 0 N O w G DRAWN BY: 1- W W S N