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2. All pits shall have an inside diameter of at least five <br />(5) feet. <br />Construction of all seepage pits shall conform to the following <br />requirements: <br />1. To prevent cave -in, the pit shall be precast concrete or <br />lined with brick, stone or block at least four (4) inches thick, <br />laid in a radial arch to support the pit walls. <br />2. The brick, stone, or block shall be laid watertight <br />above the inlet and with open joints below the inlet to provide <br />adequate passage of liquids. <br />3. A minimum annular space of twelve (12) inches between <br />the pit lining and excavation Wall shall be filled with crushed <br />rock or gravel. <br />4. The seepage pit shall be so constructed at the top as to <br />be capable of supporting the overburden of earth and any <br />reasonable load to which it is subjected. Access to the pit <br />shall be provided by means of a manhole or inspection hole <br />equipped with a watertight cover. The seepage pit may terminate <br />in a conventional manhole top, frame and cover, but if a manhole <br />is used, it shall extend through the earth cover to a point <br />within twelve (12) inches, but no closer than six (6) inches, <br />below finished grade. The manhole cover shall be covered with at <br />least six (6) inches of earth. The top of the seepage pit shall <br />be not less than twelve (12) inches below the ground surface. <br />The top shall be provided with an inspection pipe of not less <br />than four (4) inch diameter extending to a point flush with <br />finished ground level. The top of the inspection pipe shall be <br />provided with a readily removable watertight cap. <br />Holding Tanks <br />General <br />Holding tanks may be allowed only as replacements for existing <br />non- conforming urban service area systems and only where it can <br />conclusively be shown that a standard or approved alternative <br />system cannot be feasibly installed, or where holding tanks can <br />be demonstrated to be more economical than alternative systems. <br />Construction <br />A holding tank shall be constructed of the same materials and by <br />the same procedures as those specified for watertight septic <br />tanks, except that there be no outlet pipe. <br />Access <br />A cleanout pipe of at least six (6) inches diameter shall extend <br />