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§ 8.30 <br /> <br />Page 246 <br /> <br />Sub& 4. Distr~ution of effluent. <br /> <br />Gravity ~utio-- <br /> <br />1, Level Ground. Where the elevation rl~i~erences of the ground <br /> surface does not exceed 28 inches in any direction within the <br /> soil treatment area, the sewage tank may be directed to the <br /> soil treatment area through a system of interconnected <br /> distribution pipes or trenched in a continuous system. <br /> SHghtly Sloping Gro11Fl& Where the elevation difference of <br /> the ground surface exceeds 28 inches in any direction within <br /> the soil treatment area, the sewage tank effluent may be <br /> distributed by a distribution box, provided the final ground <br /> surface elevation of the lowest trench is at least 1 foot higher <br /> than the outlet inverts of the distribution box. <br /> (a) The box shall be watertight vcith a removable cover and <br /> shall be constructed of durable materials not subject to <br /> excessive corrosion or decay. Each outlet shall have at <br /> least 6 inches of sidewall space and' the side of any outlet <br /> shall be at least 6 inches from any corner. <br /> 0o) The inverts of all outlets shall be at the same elevation. <br /> (c) The inlet inverts shall be at least 1 inch above the outlet <br /> inverts. <br /> (d) The outlet inverts shall be at least 4 inches above the <br /> distribution box floor. <br /> (e) Each drainfield trench line shall be connected <br /> separately to the distribution box and shall not be <br /> subdivided. <br /> (f) When sewage tank effluent is delivered to the <br /> distribution box by pump, either a baffle wall shall be <br /> installed in the distribution box or the p,rnp discharge <br /> shall be directed against' a wall Or-s~de of the box on <br /> which there is no outlet. The baffle shall be secured to <br /> the box and shall extend at least 1 inch above the crown <br /> of the inlet flow line. <br /> <br />Sloping Ground. Where the elevation difference of the <br />ground surface exceeds 28 inches in any direction within soil <br />treatment area and a distribution box cannot be used as <br />specified in subdivision 1 above, a drop box shall he installed <br />at the head end of each lateral line. Connection between drop <br />boxes shall be by watertight pipes. <br />(a) The drop box shall be watertighf and constructed of <br /> durable materials not subject to excessive corrosion or <br /> decay. Each outlet shall have at least 6 inches of <br /> sidewall space and the side of any out]et shall be at least <br /> 4 inches from any corner. <br /> <br />Printed 12/28/90 <br /> <br />I <br />I <br />I <br />t <br />I <br />I <br />I <br />I <br />! <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />i <br /> <br /> <br />