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1. The required soil treatment area shall be determined by number of bedrooms for dwellings and definition of "water usage" for other establishments. 2. The minimum soil treatment area required for any dwelling shall provide for at least two (2) bedrooms. 3 . The minimum soil treatment area required for multiple residential units shall consist of the sum of the areas required for each individual unit. 4. Trench and bed size shall be at least as large as set forth in Table II. T ABLE II Required Soil Treatment Area in Square Feet of Trench Bottom Percolation rate m Per Gallon of Sewage Depth of Filter Material Below minutes per inch Flow per day Distribution pioe (c) 6" I 12" 18" 24" Faster Than 0.1 (d) Special Soil Treatment Required. See Section 0.1 to 5(e) 0.83 170 135 115 105 6 to 15 1.27 255 205 170 155 Percolation rate m Per Gallon of Sewage Depth of Filter Material Below minutes per inch Flow per day Distributionpioe (c) 16 to 30 1.67 335 270 225 205 31 to 45 2.00 400 320 265 240 46 to 60 2.20 440 355 290 265 61-120(e) - - - - - a. Table II is based on a sewage flow of two hundred (200) gallons per day per bedroom and shall be used as the basis for sizing household systems. b. In every case, sufficient area shall be provided for at least two (2) bedrooms in dwellings. c. For systems other than household systems, the required treatment area shall be based upon gallons of waste per day. The required treatment area may be reduced, for trenches only, by the following percentages: Twenty percent (20%) for twelve (12) inches of filter materials below the distribution pipe; thirty-four percent (34%) for eighteen (18) inches; and forty percent (40%) for twenty-four (24) inches. The filter material shall completely encase the disposal pipes to a depth of at least two (2) inches. d. Soil is unsuitable for standard system if percolation rate is less than one- tenth (0.1) minute per inch. e. Special requirements for treatment units for problem soils with this percolation range. For soils having more than 50 percent of very fme sand by weight, plus fme sand having a particle size range of 0.05 millimeters (sieve size 270) to 0.25 millimeters (sieve size 60), the required soil treatment area is 1.67 square feet per gallon of sewage flow per day. 50 I I I I I I I I I I I I I I I I I I I