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I <br />,I <br />I <br /> <br />The location of seepage pits, in addition to the general provisions under <br />Chapter 150.014F, shall be not less than the stated minimum distances from the <br />fo 1 lowing: <br /> <br />- 23 - <br /> <br />I <br />I <br /> <br />I <br />I <br />I <br />I <br /> <br />Wells less than fifty (50) feet in depth and not encountering at least <br />ten (10) feet of { ~mpervious materialo~-~v ~+~~n'p~ <br />Any water supply well or buried water ....... ....... 150 75 ft. ft. <br />Buildings ............... 20 ft. <br />Property liras and buried ~i~' ~stri~tio~ wa~e~ &~er <br />pressure ............................ 10 ft. <br />Other seepage pits ............. 3 times <br />the diameter of the ia~Js~ pig ~ed~ to ~) <br /> <br />Effective soil treat,~nt area of a seepage pit shall be calculated as the <br />sidewall area below the inlet, exclusive of any hardpan, rock, or clay <br />formations. The sidewall area shall be based on the outer diameter of the pit <br />lining plus twelve (12) inches of rock in the annular space. <br /> <br />Required treatment area shall be determined by the percolation test described in <br />Chapter 150.014A and from using the col,,.,,-~ for seepage beds in Table 4-1. In no <br />case shall a seepage pit be installed in soils where the percolation rate of any <br />stratum is faster than one-half (1/2) minute per inch (coarse sand). A <br />percolation test shall be made in each vertical stratum penetrated by the <br />seepage pit, and the weighted average of the results, exclusive of results from <br />soil strata in which the percolation rate is slower than thirty (30) minutes per <br />inch, shall be computed and applied to the seepage bed column of Table 4-1 as <br />indicated. <br /> <br /> 1. A minimum of four (4) feet composite depth of porous formation for <br />each installation shall be provided in one (1) or more pits. <br /> <br />2. All pits shall have an inside diameter of at least five (5) feet. <br /> <br />Construction of all seepage pits shall conform to the following requirements: <br /> <br /> 1. To prevent cave-in, the pit shall be precast concrete or lined with <br />brick, stone or block at least four (4) inches thick, laid in a radial arch to <br />support the pit walls. <br /> <br /> 2. The brick, stone, or block shall be laid watertight above the inlet <br />and with open joints below the inlet to provide adequate passage of liquids. <br /> <br /> 3. A minimum anmlar space of twelve (12) inches between the pit <br />lining and excavation wall shall be filled with crushed rock or gravel. <br /> <br /> 4. The seepage pit shall be so constructed at the top as to be capable <br />of supporting the overburden of earth and any reasonable load to which it is <br />subjected. Access to the pit shall be provided by means of a mnhole or <br />inspection bole equipped with a watertight cover. The seepage pit may terminate <br />in a conventional manhole top, fram~ and cover, but if a mnhole is used, it <br />shall extend through the earth cover to a point within twelve (12) inches, but <br />no closer tkan six (6) inches, below finished grade. The manhole cover shall be <br />covered with at 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. The top shall be <br />provided with an inspection pipe of not less than four (4) inch diameter <br /> <br /> <br />