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<br />b. Slightly sloping ground <br /> <br />1. Sewage tank effluent may be distributed by <br />a distribution box provided the final ground <br />surface elevation of the lowest trench is at <br />least 1 foot higher than the outlet inverts of <br />the distribution box. <br /> <br />2. Distribution box: the box shall be water tight <br />with a removable cover and shall be <br />constructed of durable materials not subject <br />to excessive corrosion or decay. <br /> <br />a. The inverts of all outlets shall be at the <br />same elevation as measured from a <br />liquid surface in the bottom of the box. <br /> <br />b. The inlet invert shall be at least one inch <br />above the distribution box floor. <br /> <br />c. The outlet inverts shall be at least 4 <br />inches above the distribution box floor. <br /> <br />d. Each drain field trench line shall be <br />connected separately to the distribution <br />box and shall not be subdivided. <br /> <br />e. When sewage tank effluent is delivered <br />to the box by pump, either a baffle wall <br />shall be installed in the distribution box <br />or the pump discharge shall be directed <br />against a wall, bottom, or side of the box <br />on which there is no outlet. The baffle <br />shall be secured to the box and shall <br />extend at least one inch above the <br />crown of the inlet flow line. <br /> <br />25 <br />