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May 21,2002 <br /> ` Job Number: LGO2-140 <br /> Page 8 <br /> ` Proposed Parcel No. 4 had three(3)percolation tests due to a drilling error. Instead of <br /> abandoning the 3.5-foot deep hole that was intended to be a 3-foot hole, it was decided to <br /> evaluate it anyway. <br /> All the percolation test casings were a 2-inch PVC pipe with several holes drilled on the <br /> bottom of the casing. Approximately 6 inches of"pea gravel"was placed in the bottom of each <br /> r. hole, the casing was installed, and several feet of"pea gravel"was backfilled in the annular <br /> space. Presaturation of the holes was performed the day before the percolation test. <br /> The percolation tests were conducted on May 7 and May 15, 2002 in accordance with the <br /> requirements of San Joaquin County Environmental Health Division. The last '/2 hour of the tests <br /> were observed by Johnny Yoakum and Lisa Medena of that office. A satisfactory percolation rate <br /> for a shallow test (3-feet) is 60 min/in or less. A satisfactory percolation rate for a deep <br /> percolation test (>3 feet and<=25 feet) is 30 min/in or less. In order to "pass"the inspected <br /> _ percolation test, either the shallow or deep test is required to exceed the minimum specified rates. <br /> Shallow and deep tests were conducted on each of the proposed parcels. Parcel No. 2 <br /> i (deep test) was the only parcel that exhibited a satisfactory percolation rate. Parcel No.'s 1, 3, <br /> and 4 did not exhibit a satisfactory percolation rate on either the shallow or deep tests. Either a <br /> shat ow or de percolation test needs to obtain a satisfactory percolation rate for a satisfactory <br /> test. A summary of the percolation tests are presented in Table 4. <br /> Table 4. <br /> Summary of Percolation Tests. <br /> Lot Test,Date Test Depth Percolation Rate <br /> r I Shallow,5-7-02 3-ft Fail:No movement observed <br /> 1 Deep,5-7-02 21.5-11 Fail: 250-min/in <br /> `. 2 Shallow,5-7-02 3-ft Fail:No movement observed <br /> 2 Deep,5-7-02 21-ft Pass:25-min/in <br /> 3 Shallow,5-7-02 3-ft Fail:No movement observed <br /> 3 Deep,5-7-02 20.5-11 Fail: 83-min/in <br /> 4 Shallow,5-7-02 3-ft Fail: 125-min/in <br /> 4 Deep, 5-7-02 3.5-ft Fail: 50-min/in <br /> 4 Deep,5-15-02 14.5-11 Fail: 125-min/in <br /> 1o�gso <br /> P i <br /> Z <br /> O <br /> �SSOC\ <br />