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I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> I <br />I <br /> I <br /> <br /> I <br /> ! <br /> I <br /> I <br /> I <br /> <br />a. · Table 4-1 ]s based on a sewage fl'ow of two hundred <br /> (2_00) gallons per day per bedroom and shall be used <br /> as the basis for sizing household systems. <br />b. In every case, sufficient area shall be provided for <br /> at least two (2) bedrooms in dwellings. <br />c. For systems other than household systems, the required <br /> treatment area shall be based upon gallons of waste <br /> per day. The required treatment area may be reduced, <br /> for trenches only, by the following percentages: <br /> Twenty percent (20%) for twelve (12) inches of filter <br /> material below the d~stribution pipe; thirty/four <br /> percent (34%) for eighteen (18) inches; and forty <br /> percent (40%) for twenty-four (24) inches. The filter <br /> material shall completely encase the disposal pipes <br /> to a depth of at least two (2) inches. <br /> d. Soil is unsuitable for standard system if percolation <br /> rate is less than one-half (1/2) minute per inch. <br /> See Chapter 150.014G. <br /> e. Consider sewage treatment units for problem soils with <br /> this percolation range. See Chapter 150.014G. <br /> <br />Subd. 2 If)CATION <br /> <br /> 1. On slopes in excess of twelve percent (12%), the soil pro- <br />file shall be carefully evaluated in the location of the proposed soil <br />treatment area and downslope to identify the presence of layers that <br />may cause sidehill seepage. In no case shall a trench be located within <br />fifteen (15) feet of such a layer surfacing on the downslope. <br /> <br /> 2. Bed construction shall be limited to areas having natural <br />slopes of less than six percent (6%). <br /> <br /> 3. Any s~il treatment area other than seepage pits shall be <br />set back the following distances from the features given below. <br /> <br /> Feature <br />Water supply well less <br /> than 50 feet deep and <br /> not encountering at <br /> ]east 10 feet of <br />impervious material <br />Any other water supply <br /> well or buried water <br /> suction pipe <br />Bur~ed pipe distributing <br /> water under pressure <br />Bu~ lding <br />Property lines <br /> <br />Setback Distance in Feet <br /> <br />100' <br /> <br />50 <br /> <br />10 <br /> <br />20 <br />10 <br /> <br />*Required for new developments and, where practicable, <br />for existing developments. <br /> <br /> 4. Any soil treatment area other than seepage pits shall be <br />set back the following distances if located in an area which has been <br /> <br /> <br />