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<br /> <br />37 <br />per inch unless the moisture content is lower than the <br />plastic limit of the soil. <br /> <br />3. In no case shall construction equipment, wheels or <br />tracks, be placed in contact with the bottom of the <br />excavation during the construction of a soil treatment <br />system in soils having a percolation rate slower than <br />15 minutes per inch. <br /> <br /> 4. The size of the soil treatment system shall be based on <br />2.2 square ft/gallon/day for a soil at 60 m.p.i.; 4.2 <br />square ft/gallon/day for a soil at 120 m.p.i. <br /> <br /> <br /> e. Rapidly permeable soils: <br /> <br /> 1. Filter material for a soil treatment unit using gravity <br />distribution effluent shall not be place placed in contact <br />with original soil having a percolation rate faster than <br />one- tenth minute per inch. <br /> <br /> 2. For course soils having a percolation rate faster than <br />one-tenth minute per inch, at least 6 inches of sandy <br />loam textured soiling having a percolation rate <br />between 5 and 15 minutes per inch after placement <br />(loamy sand to sandy loam) shall be placed between <br />the filter material and the coarse soil along the <br />excavation bottom and sidewalls. <br /> <br /> 3. For soils with percolation rates between one-tenth and <br />5 minutes per inch at least one of the following <br />treatment techniques shall be used: <br /> <br /> a. Provide at least 6 inches of sandy loam textured soil <br />with a percolation rate between 5 and 15 minutes <br />per inch after placement between the filter material <br />and the coarse soil. <br />