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percentages: Twenty per cent (20%) for twelve.(12) inches of filter materials below the distribution pipe: thirty-four per cent (34%) for eighteen (18) inches: and forty per cent (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 fine sand by weight, plus fine 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. Subd. 2 - Location 1. On slopes in excess of twelve per cent (12%), the soil profile shall be carefully evaluated in the location of the proposed soil treatment area and downslope to identify the presence of layers with different permeabilities that may cause sidehill seepage. In no case shall a trench be located within fifteen (15) feet of where such a layer surfaces on the downslope. 2. Bed construction shall be limited to areas having natural slopes of less than six per cent (6%). 3. Any soil treatment area shall be set back the following distances from the features given below. Feature Setback Distance in Feet Water supply well less than 50 feet deep and not en- countering at least 10 feet of impervious material Any other water supply well or buried water suction pipe Buried pipe distributing water under pressure Building Property lines 100* 50 10 20 10 *Required for new developments and, where applicable, for existing developments. 3