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L <br /> ' June 4, 2004 <br /> ` NOA Project Number: E04065A <br /> ` 6.3 Presaturation of Borings <br /> L Presaturation of the percolation test holes occurred on June 1, 2004. The depth of water used <br /> to presoak was 12 inches above the bottom of the borings. After the 24-hour soak period, the <br /> presaturated holes were found to be intact on June 2, 2004. The deep holes were found to be <br /> L. dry, while the shallow holes were found to have standing water. <br /> 6.4 Percolation Test Procedure and Results <br /> L <br /> Four 4-hour percolation tests were conducted on June 2, 2004 in accordance with the <br /> Lrequirements of San Joaquin County EHD. Due to scheduling problems, an inspector was <br /> not available to observe the last half hour of the 4-hour tests. Instead,the tests were run an <br /> additional hour for a total of five hours. The last half hour of the percolation tests was <br /> L observed by Ms. Linda Turkette, Registered Environmental Health Inspector, EHD. <br /> Measurement of the water level during the percolation test was from a fixed reference point <br /> L on the PVC casing using an electric well sounder with an depth accuracy of 1/100th foot. All <br /> values on the field data sheet (appendix) are in decimal feet unless otherwise noted. After <br /> water drop was observed, the holes were checked for refill. The refill level is 6 inches of water <br /> above the bottom level of the percolation test hole. The readings were taken approximately <br /> every 30-minutes for the 5-hour duration tests. <br /> ` A satisfactory percolation rate for a deep (greater than 3.5-foot deep) test is 30 min/in or less, <br /> and a satisfactory rate for a shallow (3-3.5 foot deep) test is 60 min/in or less. <br /> On Parcel 1 (P-1), the shallow percolation test failed due to no movement of the water, but <br /> the deep percolation test achieved a satisfactory percolation rate of 8.1 min/in. On Parcel 2 <br /> L (P-2),the shallow percolation test failed with a percolation rate of 250 min/in, but the deep <br /> percolation test achieved a satisfactory percolation rate of 15.6 min/in. A summary of the <br /> Lpercolation tests is presented in Table 5. <br /> L <br /> L <br /> 9 <br /> L <br /> L <br />