Laserfiche WebLink
TABLE II <br />Required Soil Treatment Area in Square Feet <br /> of Trench Bottom <br /> <br />Percolation <br />rate in min- <br />utes per inch <br /> <br />Per Gallon <br />of Sewage Flow <br /> per day <br /> <br />Depth of Filter Material Below <br /> Distribution pipe (c) <br /> <br />Faster Than <br />0. i (d) <br />0.1 to 5(e) <br />6 to 15 <br />16 to 30 <br />31 to 45 <br />46 to 60 <br />61-120 (e) <br /> <br />6" 12" 18" 24" <br /> <br />Special Soil Treatment Required. See Section <br />0.83 170 170 135 115 105 <br />1.27 255 255 205 170 155 <br />1.67 335 335 270 225 205 <br />2.00 400 400 320 265 240 <br />2.20 440 440 355 290 265 <br /> <br />Table II is based on a sewage flow of two hundred <br />(200) gallons per day per bedroom and shall be used <br />as the basis for sizing household systems. <br /> <br />be <br /> <br />In every case, sufficient area shall be provided for <br />at least two (2) bedrooms in dwellings. <br /> <br />For systems other than household systems, the <br />required treatment area shall be based upon gallons <br />of waste per day. The required treatment area may <br />be reduced, for trenches only, by the following <br />percentages: Twenty per cent (20%) for twelve (12) <br />inches of filter materials below the distribution <br />pipe; thirty-four per cent (34%) for eighteen (18) <br />inches; and forty per cent (40%) for twenty-four (24) <br />inches. The filter material shall completely encase <br />the disposal pipes to a depth of at least two (2) inches. <br /> <br />Soil is unsuitable for standard system if percolation <br />rate is less than one tenth (0.1) minute per inch. <br /> <br />Special requirements for treatment units for problem <br />soils with this percolation range. For soils having <br />more than 50 percent of very fine sand by weight, plus <br />fine sand having a particle size range of 0.05 <br />millimeters (sieve size 270) to 0.25 millimeters (sieve <br />size 60), the required soil treatment area is 1.67 <br />square feet per gallon of sewage flow per day. <br /> <br />Location <br /> <br /> 1. On slopes in excess of twelve per cent (12%), the soil <br />profile shall be carefully evaluated in the location of the <br />proposed soil treatment area and downslope to identify the presence <br /> <br /> <br />