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). H. KLEINFELDER & ASSOCIATES File No. S-1805-2 <br /> May 5 , 1975 <br /> PAGE THREE <br /> PERCOLATION TESTS <br /> Percolation tests were performed in each of the four <br /> borings . Each percolation hole was initially filled with <br /> water on April 24, 1975 , to presoak the soils . The percolation <br /> tests were performed on April 25 , 1975 Approximately 2 inches <br /> of pea gravel was placed in the bottom of each hole prior to <br /> filling . Perforated Orangeburg pipe was also installed in each <br /> boring. The tests were performed by filling each hole with <br /> water to a fixed reference point and allowing the water to <br /> percolate into the soil. The rate at which the water percolated <br /> into the soil was measured . The tests were performed for a <br /> period of 32 hours _ The percolation test data are presented <br /> graphically on Plates III through VI . <br /> Based on the field percolation data , we have calculated <br /> the following rates of percolation: <br /> CALCULATED PERCOLATION RESULTS <br /> Depth Calculated Average <br /> Test of Percolation in Rate of Percolation <br /> No. Hole Minutes/Inch in Gal./SF /Day <br /> 1 25 ' 2 .5 2.24 <br /> 2 4 ' 40.0 0.73 <br /> 3 25 ' 3 .9 L4 <br /> 4 4 ' 28.2 1. 1 <br /> It should be noted that the tests were made using clear <br /> water, and do not necessarily directly measure the rate at <br /> which a sewage effluent will percolate. If these data are to <br /> be used for design purposes , it is recommended that an appro- <br /> priate factor of safety be applied . <br />