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• <br />(5) Each drainfield trench line shall'be <br />connected separately to the distribution , <br />box and shall not be subdivided. <br />(6) When sewage tank effluent is delivered <br />to.the'distribution box by pump, either <br />- a baffle wall shall be installed in'the <br />' distribution box or the pump discharge <br />shall. be directed against a wall or side <br />I <br />of the box on which there is no outlet. <br />The baffle .shall be secured to the box <br />_ <br />and shall extend at least one inch above <br />the top of the inlet flow line. <br />t- <br />` <br />3. Sloping Ground <br />(a) 'Where the elevation difference of the ground <br />surface exceeds 28 inches in any direction ` <br />within soil treatment area and a distribution <br />box cannot be used as specified in item A-2. <br />above, a drop box shall be installed at the head <br />end of each lateral line. Connections between <br />drop boxes shall be*by watertight pipes. <br />` • <br />(b) Drop Boxes <br />�- <br />(1) The drop box shall be watertight and constructed <br />of precast concrete. The minimum inside <br />dimension shall be at least ten inches, unless <br />C <br />the box is to. be used .as a valve box. Then <br />each outlet shall -have at least eight inches <br />of sidewall space and the side of 'any outlet <br />C- <br />shall be at, least six inches from any corner. <br />(2) The invert of the inlet pipe shall be at <br />least one inch higher than the invert of the <br />outlet pipe to the`next trench. <br />[_ <br />(3) The invert of the outlet pipe to the next <br />trench shall be at least two inches higher <br />than the invert of the outlet pipe of the <br />!. <br />trench in which the box'is located.. <br />(4) When sewage tank effluent is delivered to the, <br />{. <br />drop box by a pump, the pump discharge shall <br />be directed. against a wall or side of the box <br />on which there is no'outlet. <br />- --32 <br />