HomeMy WebLinkAboutOWTS Design Report 07.12.2019Design Calculations
For
Long Residence
Onsite Wastewater Treatment System
Parachue, Colorado
July 12, 2019
CIVCO Engineering Inc
Civil Engineering Consultants
Vernal, Utah
1256 W. 400 S. 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
ONSITE WASTEWATER TREATMENT SYSTEM Page 1
LONG RESIDENCE By: WK Date: 07/12/2019
Parachute, Colorado Chk'd: wk Date: 07/12/2019
ONSITE WASTEWATER TREATMENT SYSTEM
Referenced Calculations
Description
Section contains calculations sizing the components of the OWTS to be located near
Parachute, Colorado.
Design Standards
CDPHE On-site Wastewater Treatment System Regulation CCR
01 OWTS.mcdx
CIVCO Engineering, Inc.
PO Box 1758, Vernal, UT, 84078
Ph: (435)789-5448
Fx: (435)789-4485
Number of Bedrooms
Perk Test Results:
ONSITE WASTEWATER TREATMENT SYSTEM Page 2
LONG RESIDENCE By: WK Date: 07/12/2019
Parachute, Colorado Chk'd: wk Date: 07/12/2019
Nbed:= 4
Minutes
Elapsed
Test Hole 1
Test Ho:e 2
Test Hole 3
Water
Level Drop
(in.)
Perk Rate
(Min./In.)
Inches
Measured
to Wtr Surf
Perk Rate
(Min./In.)
nches
Measured
to Wtr Surf
Perk Rate
(Min./In.)
15.00
2
7.50
2.5
6.00
2
7.50
30.00
1.5
10.00
1.5
10.00
1.5
10.00
45.00
1
15.00
1
15.00
0.75
20.00
60.00
1
15.00
0.75
20.00
0.75
20.00
Hole Perk Rate: 15.00 20.00 20.00
Ave. Perk Rate: 18.33
SEPTIC TANK
Required Tank Volume
Vtank:=
if Nbed<3
1000 . gal)
else
11( 1000 • gal+ (Nbed— 3) • 250. gal)
[CCR TABLE 9-1]
=1250ga/
First Compartment Volume V,st comp:=
01 OWTS.mcdx
if Nbed<3 =625 gal
500 • gal)
else
11(500.gal+ (Nbed— 3) • 125 • gal)
[CCR 43.9.6.4.a]
CIVCO Engineering, Inc.
PO Box 1758, Vernal, UT, 84078
Ph: (435)789-5448
Fx: (435)789-4485
SOIL TREATMENT AREA
Design Flow Q:=
ONSITE WASTEWATER TREATMENT SYSTEM Page 3
LONG RESIDENCE By: WK Date: 07/12/2019
Parachute, Colorado Chk'd: wk Date: 07/12/2019
if /V,8,<2
300 gal
day
else if Nbed= 3
450 gal
day
else if Nbed> 3
450 gal +(Nbed-3) 75
day
Long-term Acceptance Rate (LTAR)
gal
day
= 525 ga/ [CCR Table 6-1]
day
gal
Perk Rate t:= tave—
= 18.33 min Type 2 soil.... LTAR:= 0.6 day
1/9 2
[CCR Table 10-1]
Unfactored Soil Treatment Area STA:— 0— 875 ft2
LTAR
Soil Treatment Area (Factored for Trenched Chambers)...
Application Method Size Adjustment Factor.... SAFAM:= I .0 (gravity)
[CCR Table 10-2]
Distrib. Media Size Adjustment Factor SAFoM:= O.7 (chambers)
[CCR Table 10-3]
Cumulative Size Adjustment Factor.... SAF:= if 5AFAM. SAFDM> 0.5 = 0.7
5AFAM• SAFoM
else
0.5
[CCR 43.10.D.3]
Trenched Chambers Soil Treatment Area STArc:= SAF• 57-A=6 12.5 ft2
Chamber Bottom Width 8,:= 34 /n
STArc
Required Trenched Chamber Length LTC:= = 216. 18 ft
B
01 OWTS.mcdx
CIVCO Engineering, Inc.
PO Box 1758, Vernal, UT, 84078
Ph: (435)789-5448
Fx: (435)789-4485
ONSITE WASTEWATER TREATMENT SYSTEM Page 4
LONG RESIDENCE By: WK Date: 07/12/2019
Parachute, Colorado Chk'd: vvk Date: 07/12/2019
Soil Treatment Area (Factored for Bedded Chambers)...
Application Method Size Adjustment Factor..... SAFAM:= 1.2 (gravity)
Distrib. Media Size Adjustment Factor 5AF0M:=0.7 (chambers)
[CCR Table 10-2]
[CCR Table 10-3]
Cumulative Size Adjustment Factor.... SAF:= if SAFAM• SAFoM> 0.5 =0.54
II SAFAM• SAFoM
else
110.5
[CCR 43.10.D.3]
Bedded Chambers Soil Treatment Area STATS:= SAF• STA= 735 ft2
Chamber Bottom Width 5,:= 34 in
Required Trenched Chamber Length Lir:— STATS _ 259.41 ft
5,
01 OWTS.mcdx
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).
B. SEPTIC TANK
1250 GALLON CAPACITY w/ 625 GALLON (MIN.) 1st COMPARTMENT. MEET
STRUCTURAL CRITERIA OF ASTM C1227-12 FOR PRE -CAST CONCRETE TANKS.
MEET STRUCTURAL CRITERIA OF IAPMO/ANSI Z1000-2007 FOR FIBERGLASS,
FIBERGLASS -REINFORCED POLYESTER, AND PLASTIC TANKS. SEAL PIPE
INLETS & OUTLETS WITH WATER -TIGHT MATERIALS.
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
216 MINIMUM COMBINED LINEAR FEET OF 34 -INCH WIDE CHAMBER. CHAMBER
ROWS MUST BE 100 FEET OR LESS IN LENGTH FROM INLET TO END.
E. INSPECTION PORT
4"0 VERTICAL PLASTIC PIPE TO BOTTOM OF TRENCH. PERFORATE BOTTOM
12 INCHES. PROVIDE THREADED CAP AT TOP.
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PROFILE HOLE
PERK TEST
LOCATIONS
SYSTEM PLAN
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