HomeMy WebLinkAboutpitkin.eh.264503201002 (2001)_ISDS REQMTSASPEN/PITKIN ENVIRONMENTAL HEALTH DEPARTMENT
SDS DEIGN REQUIREMENTS -DEPARTMENT USE ONLY
Name
House SIZE 1,200 (75 gpd, 100 gpd, or 130 gpd) 75
#of Bedrooms, Similar Rooms accessible to baths in Main Residence 2
# of Bedrooms, similar rooms w/ access to bath in ATTACHED caretaker
# of Bedrooms & Similar Rooms w/ access to baths in DETTACHED caretaker
Average Daily Waste Flow 300 # bedrooms X 2 people/br X 75
State Review Required? no
Perc Rate 30 (T)
3 equals # of Perc Holes Required
Design Flo w (Q) = # bedrooms X 2 people/bedroom X gpd X 1.75
Q= 525
Minimum tank capacity 656 gallons
Absorption Area (A== Q/5 X SART)
A = 575 sq. ft. of absorption area required
37 infiltrator units without reduction
A maximum 30% reduction is allowed for use of deep gravel or gravelless chambered system.
403 sq.ft. with reduction
26 infiltrator units with reduction
AREA NEEDED FOR STANDARD ABSORPTION TRENCHES
192 575 Total sq ft /3 =lineal ft of trench needed
4 192 lineal ft/assumed trench length of 60ft = # of 60ft trenches needed
3 # trenches minus 1 = rows of 6ft wide undisturbed soil between trenches
12 4 times 3 = total width of of 60" long field needed for just the trenches
18 3 times 6' = total width of 60' long field needed just for undisturbed soil
30 width of trench +width of undisturbed soil = total width needed
30 by 60 ft is the area needed for a standard absorption field in a trench configuration with no
reductions taken and ASSUMING AN AVERAGE PERCOLATION RATE OF 30
SLOWER PERCOLATING SOILS WOULD REQUIRE MORE AREA.
SETBACK FROM WELL SETBACK FROM POND, STREAM OR IRRIGATION DITCH
# of feet = 100 # of feet = 50
SETBACK FROM DRY GULCH
# of feet = 2.5
Remember: 8 feet of additional distance for each 100 gallons/day of design flow over 1,000 gallons/day
should be added unless an RPE can verify that it is not necessary to prevent contamination.
1/20/99
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