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<br /> <br />43 <br /> u. Shrubs must not be planted on the top of the mound. <br />Shrubs may be placed at the foot and side of the <br />mound. <br /> <br /> v. The side slopes on the mound must not be steeper than <br />3 to 1. <br /> <br />w. Whenever mounds are located on slopes, a diversion <br />must be constructed immediately upslope from the <br />mound to intercept and direct runoff. <br /> <br /> x. A pump must be used as specified in these rules and <br />regulations. <br /> <br /> 4. Holding Tanks <br /> <br /> a. General – Holding tanks may be allowed only as <br />replacements for existing non-conforming systems or on <br />existing parcels or lots as the date of the enactment of <br />these standards and only where it can conclusively be <br />shown that a standard or mound system cannot be <br />feasibly installed. <br /> <br /> b. Construction – A holding tank shall be constructed of the <br />same materials and by the same procedures as those <br />specified for water tight septic tanks. <br /> <br /> c. Access – A cleanout pipe of at least 6 18 inches in <br />diameter shall extend to the ground surface and be <br />provided with seats to prevent odor and to exclude <br />insects and vermin. A manhole of at least 30 18 inches in <br />diameter shall extend though the cover to finished grade. <br />least dimension shall extend through the cover to a point <br />within 12 inches, but no closer than 6 inches below <br />finished grade. The manhole cover shall be covered with <br />at least 6 inches of earth <br /> <br /> d. Depth of bury – The tank shall be protected against <br />flotation under high water table conditions. This shall be