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OWTS Design Report 02.13.2020
Design Calculations For Lisa Locke On-site Wastewater Treatment System 329 County Road 216 Rifle, Colorado February 13, 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: 02/07/2020 Chk'd: wk Date: 02/13/2020 Section contains calculations sizing the components of the On-site Wastewater Treatment System. Design Standards CDPHE On-site Wastewater Treatment System Regulation CCR 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:= 3 Perk Test Results: OWTS SIZING Page 2 By: WK Date: 02/07/2020 Chk'd: wk Date: 02/13/2020 Minutes Elapsed Test Hole 1 Test Hole 2 Test Hole 3 Water Level Drop (in.) Perk Rate (Min./In.) Inches Measured to Wtr Surf Perk Rate (Min./In.) Inches Measured to Wtr Surf Perk Rate (Min./In.) 15.00 0.5 30.00 1.5 10.00 1 15.00 30.00 0.5 30.00 1.5 10.00 1 15.00 45.00 0.5 30.00. 0.75 20.00 1 15.00 60.00 1 15.00 0.5 30.00 1 15.00 Hole Perk Rate: 15.00 30.00 15.00 Ave. Perk Rate: 20.00 SEPTIC TANK Required Tank Volume First Compartment Volume OWTS SIZING.mcdx Vtank:— if Nbed< 3 11( 1 000. g4 else 1000•gal+(Nbed-3) •250•gal) [CCR TABLE 9-1] Vlst comp= = 1000 gal if Nbed<3 =500 gal 500 • ga. else 0(500 • gal+Nbed— 3) • ! 25 • ga/) [CCR 43.9.B.4.a] CIVCO Engineering, Inc. PO Box 1758, Vernal, UT, 84078 Ph: (435)789-5448 Fx: (435)789-4485 SOIL TREATMENT AREA Design Flow Q:= LOCKE RESIDENCE 329 County Road 216 Rifle, Colorado OWTS SIZING Page 3 By: WK Date: 02/07/2020 Chk'd: wk Date: 02/13/2020 if /Vbed< 2 = 450 ! [CCR Table 6-1] day 300 gal day else if Nbed= 3 450 gal day else if Nbed> 3 450 daygal + (Nbed— 3) 75day Long-term Acceptance Rate (LTAR) gal Perk Rate t:= tave- - 20 min Type 2 soil.... LIAR:- 0.6 day in ft2 [CCR Table 10-1] Unfactored Soil Treatment Area STA.— a-750 ft2 LTAR Soil Treatment Area (Factored for Trenched Chambers)... Application Method Size Adjustment Factor.... 5AFAM:= 1 .0 (gravity) [CCR Table 10-2] Distrib. Media Size Adjustment Factor 5AFDM:=0.7 (chambers) [CCR Table 10-3] Cumulative Size Adjustment Factor.... SAF:= if 5AFAM• SAFoM> 0.5 = 0.7 5AFAM• 5AFam else 110.5 [CCR 43.10.D.3] Trenched Chambers Soil Treatment Area 5TArc:= 5AF• STA= 525 ft2 Chamber Bottom Width 5,:=34 in Required Trenched Chamber Length Lrc:= SrA,c — 185.29 ft 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 OWTS SIZING Page 4 By: WK Date: 02/07/2020 Chk'd: vvk Date: 02/13/2020 Soil Treatment Area (Factored for Bedded Chambers)... Application Method Size Adjustment Factor.... 5AfAM:= I .2 (gravity) [CCR Table 10-2] Distrib. Media Size Adjustment Factor .SAFDM:=0.7 (chambers) [CCR Table 10-3] Cumulative Size Adjustment Factor.... 5AF= if 5AFAM• 5AFDM> 0.5 =0.54 5AFAM• 5AFDM else 0.5 [CCR 43.10.D.3] Bedded Chambers Soil Treatment Area 5TATc:= 5AF• STA= 630 ft2 Chamber Bottom Width .13,:= 34 in Required Trenched Chamber Length LTC:— SrrArc = 222.35 ft BG OWTS SIZING.mcdx