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I <br />I <br />I <br /> <br />I <br />1 <br /> <br />! <br />I <br />i <br />I <br />I <br />I <br />I <br /> <br />- 11 - <br /> <br />(b) SLIGHTLY SLOPING ~{OUND <br /> <br />Where the elevation difference of the ground surface exceeds twenty-eight (28) <br />inches in any direction within the soil treatment area, the sewage tar~( effluent <br />may be distributed by a distribution box, provided the final ground surface <br />elevation of the lowest trench is at least one (1) foot higher than the outlet <br />inverts of the distribution box. <br /> <br /> 1. The box shall be watertight with a removal cover and shall be <br />constructed of durable materials not subject to excessive corrosion or decay. <br />Each outlet shall have at least six (6) inches of sidewall space and the side of <br />any oulet shall be at least six (6) inches from any corner. <br /> <br />2. The inverts of all outlets shall be at the same elevation. <br /> <br /> 3. The inlet inverts shall be at least one (1) inch above the outlet <br />inverts. <br /> <br /> 4, The outlet inverts shall be at least four (4) inches above the <br />distribution box floor. <br /> <br /> 5. Each drainfield trench line shall be connected separately to the <br />distribution box and shall not be subdivided. <br /> <br /> 6. When sewage tank effluent is delivered to the distribution box by <br />p~p, either a baffle wall shall be installed in the distribution box or the <br />pump discharge shall be directed against a wall or side of the box on which <br />there is no outlet. The baffle shall be secured to the box and shall extend at <br />least one (1) inch above the crown of the inlet flow line. <br /> <br />(c) SLOPING GROUND <br /> <br />Where the elevation difference of the ground surface exceeds twenty-eight (28) <br />inches in any direction within soil treatment area and a distribution box <br />cannot be used as specified in Subd. l(b) above, a drop box shall be installed <br />at the head end of each lateral line. Connection between drop boxes shall be by <br />watertight pipes. <br /> <br /> 1. The drop box shall be watertight and constructed of durable <br />materials not subject to excessive corrosion or decay. Each outlet shall have <br />at least six (6) inches of sidewall space and the side of any outlet shall be at <br />least four (4) inches from any corner. <br /> <br /> 2. The invert of the inlet pipe shall be at least one (1) inch higher <br />than the invert of the outlet pipe to the next trench. <br /> <br /> 3. The invert of the outlet pipe to the next trench shall be at least <br />two (2) inches higher than the invert of the outlet pipe of the trench in which <br />the box is located. <br /> <br /> 4. When sewage tank effluent is delivered to the drop box by a pump, <br />the pump discharge shall be directed against a wall or side of the box on which <br />there is no outlet. <br /> <br /> <br />