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Mr. Sandi De Jong <br /> September 25,2003 <br /> Page 10 <br /> tabulated values on the field data sheet(appendix) are in decimal feet. After water drop was <br /> observed, the holes were checked for refill. The refill level is approximately 6 inches of water <br /> above the bottom level of the percolation test hole. The readings were taken approximately every <br /> 30-minutes for a period of 4 hours. <br /> ` A satisfactory percolation rate for a deep (greater than 3.5-foot deep) test is 30 min/in or less, and <br /> a satisfactory rate for a shallow (3-3.5 foot deep) test is 60 min/in or less. <br /> The shallow percolation did not achieve a satisfactory percolation rate and failed due to no <br /> movement of the water during periods of the test. The deep percolation test achieved a <br /> satisfactory percolation rate of less than 3.8 min/in. The deep test emptied during the 30 minute <br /> period however Lisa Medina observed the test and indicated that the deep test demonstrated <br /> percolation capacity. Our office agrees with this opinion. <br /> A summary of the percolation tests is presented in Table 5. <br /> Table 5. <br /> Summary of Percolation Tests. <br /> Test No., Percolation Percolation Rate Test Comment <br /> Date Tested Test Depth(ft) (minutes/inch) Duration <br /> P-1 shallow, 7-11-03 3.5 Greater than 250 4 hr No movement,failed. <br /> P-1 deep, 7-11-03 14.5 Less than 3.8 4 hr Achieved a satisfactory <br /> percolation rate. <br /> 6.5 Discussion of Percolation Tests <br /> The deeper percolation test whose soil strata is composed of sandy material, demonstrated a <br /> satisfactory percolation rate in accordance with the requirements of the San Joaquin County <br /> EDH. The shallow zone failed the percolation test due to the presence of cemented soils or a <br /> "hard pan"zone. The soils of the site appear to be suitable for a septic system utilizing shallow <br /> leach lines and seepage pits. <br /> �pE RSO <br /> b <br /> Z W <br /> O ti <br />