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" k9lKLEINFELDER <br /> characteristics. The remaining eight tests were performed in underlying soil strata that we <br /> suspected would exhibit acceptable percolation characteristics. The results of our percolation { <br /> tests performed on October 5, 2001, showed that 3 of the 8 deeper percolation test results did not ! <br /> meet SJCPHS requirements. Therefore, on October 9, 2001, three additional percolation tests <br /> were installed. The approximate boring and percolation test locations are presented on the <br /> attached plate. <br /> Based on our findings, the subsurface soils encountered consisted predominately of very stiff, <br /> moderately plastic sandy clays to depths ranging from approximately 2 to 3.5 feet. The clays <br /> were underlain predominately by hard silts, hard clays and discontinuous and interbedded <br /> comparatively thin strata of medium dense to dense silty and clayey sands to the depths explored. <br /> The percolation tests were performed in accordance with accepted guidelines using clear potable <br /> water. The procedure calls for first placing about 2 inches of fine gravel at the bottom of the <br /> bore hole. The hole is then pre-soaked with water at least 24 hours prior to performing the test. <br /> The test is performed by first adding 6 to 12 inches of water above the gravel. From a fixed <br /> reference point, the drop in water level is measured in approximately 30 minute intervals for four <br /> hours, refilling as necessary to maintain about 6 to 12 inches of water over the gravel. Under the <br /> observation of a sanitarian from the San Joaquin County Public Health Department, the last 30 <br /> minute reading of the four hour period is recorded and used to calculate the percolation rate in <br /> minutes per inch. The estimated percolation rates at each test location are as summarized below. <br /> A copy of our field percolation test results is attached. <br />�f _m <br /> r est 1 umbex- a SP lbe th; ft; Percolation Rate(min: <br /> P-1 18.5 20.8 <br /> P-2 10 No percolation <br /> P-3 24.4 25 <br /> P-4 18.6 3.3 <br /> P-5 19.8 12.5 <br /> P-6 20 15 <br /> P-7 19.8 10 <br /> P-8 15 30 <br /> P-9 5.4 No percolation <br /> P-10 20 No percolation <br /> P-11 19.75 20 <br /> P-12 8 30 <br /> P-13 14.9 15 <br /> P-14 18.3 50 <br /> R P-15 12.5 10 <br /> P-16 17 5 <br /> P-17 9.3 20.8 <br /> P-18 4.8 8.9 <br /> P-19 24.5 2.3 <br /> 20-4476-01.G02/201 1 R1242 Page 3 of 6 <br /> ©2001 Klcinfelder, Inc. October 11,2001 <br />