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• <br />1,49 <br />SECTION 4: DISTRIBUTION OF EFFLUENT <br />A. By Gravity Flow Over The Soil Treatment Area <br />1. Level Ground <br />Where the elevation difference of the ground surface <br />does not exceed 28 inches in any direction within the <br />soil treatment area; the sewage tank effluent may be <br />directed to the soil treatment area through a system <br />of interconnected distribution pipes or trenched in <br />a continuous system. The bottom of the trenches and <br />distribution pipes shall be constructed on a relatively <br />level grade,.not to exceed six inches difference in <br />elevation. <br />2. Slightly Sloping Ground* <br />Where the elevation difference of the ground surface <br />exceeds 28 inches in any direction within the soil <br />treatment area, the sewage tank effluent may be <br />distributed -by a distribution box provided the final <br />ground surface elevation of the lowest trench is at <br />least one foot higher than the outlet inverts of'the <br />distribution box. <br />(a) Distribution Box <br />(1) The distribution box shall be precast <br />concrete with a removable cover and shall be <br />constructed of durable materials not subject <br />to excessive corrosion or decay. The minimum <br />inside dimension shall be at least ten inches <br />-" unless the box is to 'be used' as a valve `box. <br />Then each outlet shall have at least eight <br />inches of sidewall space and the side of -any <br />outlet shall be at least six inches from any <br />corner. <br />(2) The inverts of all,outlets shall be at'the <br />same elevation as measured from a liquid <br />surface in the bottom of the box. <br />(3) The inlet invert shall be at least one inch <br />above the outlet inverts. <br />(4) The outlet inverts shall be at least four <br />inches above the distribution box floor. <br />-31 <br />ti <br />• <br />1,49 <br />SECTION 4: DISTRIBUTION OF EFFLUENT <br />A. By Gravity Flow Over The Soil Treatment Area <br />1. Level Ground <br />Where the elevation difference of the ground surface <br />does not exceed 28 inches in any direction within the <br />soil treatment area; the sewage tank effluent may be <br />directed to the soil treatment area through a system <br />of interconnected distribution pipes or trenched in <br />a continuous system. The bottom of the trenches and <br />distribution pipes shall be constructed on a relatively <br />level grade,.not to exceed six inches difference in <br />elevation. <br />2. Slightly Sloping Ground* <br />Where the elevation difference of the ground surface <br />exceeds 28 inches in any direction within the soil <br />treatment area, the sewage tank effluent may be <br />distributed -by a distribution box provided the final <br />ground surface elevation of the lowest trench is at <br />least one foot higher than the outlet inverts of'the <br />distribution box. <br />(a) Distribution Box <br />(1) The distribution box shall be precast <br />concrete with a removable cover and shall be <br />constructed of durable materials not subject <br />to excessive corrosion or decay. The minimum <br />inside dimension shall be at least ten inches <br />-" unless the box is to 'be used' as a valve `box. <br />Then each outlet shall have at least eight <br />inches of sidewall space and the side of -any <br />outlet shall be at least six inches from any <br />corner. <br />(2) The inverts of all,outlets shall be at'the <br />same elevation as measured from a liquid <br />surface in the bottom of the box. <br />(3) The inlet invert shall be at least one inch <br />above the outlet inverts. <br />(4) The outlet inverts shall be at least four <br />inches above the distribution box floor. <br />-31 <br />