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150.01.4F —FINAL TREATMENT AND DISPOSAL - STANDARD SYSTEM <br />Final treatment and disposal of all sewage tank effluent shall be <br />by means of soil treatment and disposal. <br />Subd. 1 - Sizing <br />1. The required soil treatment area shall be determined by <br />number of bedrooms for dwellings and definition of "water usage" <br />for other establishments. <br />2. The minimum soil treatment area required for any dwelling <br />shall provide for at least two (2) bedrooms. <br />3. The minimum soil treatment area required for multiple <br />residential units shall consist of the sum of the areas required <br />for each individual unit. <br />4. Trench and bed size shall be at least as large as set <br />forth in Table II. <br />TABLE II <br />Required Soil Treatment Area in Square Feet of Trench Bottom <br />Percolation Per Gallon <br />rate in min- of Sewage Flow Depth of Filter Material Below <br />utes per inch per day Distribution pipe (c) <br />6" 12" 18" 24" <br />Faster Than <br />0.1 (d) <br />0.1 to 5(e) <br />6 to 15 <br />Percolation <br />rate in min- <br />utes per inch <br />16 to 30 <br />31 to 45 <br />46 to 60 <br />61 -120 (e) <br />a. <br />b. <br />c. <br />Special. Soil Treatment Required. <br />0.83 170 170 135 115 <br />1.27 255 255 205 170 <br />Per Gallon <br />of Sewage Flow <br />per day <br />1.67 335 <br />2.00 400 <br />2.20 440 <br />335 <br />400 <br />440 <br />2 <br />270 225 <br />320 265 <br />355 290 <br />See Section <br />105 <br />155 <br />Depth of Filter Material Below <br />Distribution pipe (c) <br />205 <br />240 <br />265 <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 />In every case, sufficient area shall be provided for <br />at least two (2) bedrooms in dwellings. <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 />