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chlor. opropane ) which are soil fumigants used in vineyards . A copy <br /> of the test results is contained in the Appendix . The results <br /> indicate that both substances tested for were above the MCL_ <br /> ( m�lximum concentration limit. ) al.l.owed by law,,, <br /> VI . SOIL PROFILE AND PERCOLATION TESTS <br /> A test pit was excavated to a depth of 10 feet adjacent to the <br /> existing leach line to determine the soil profile . The test pit <br /> was excavated with a Cat 41.6 backhoe equipped with a 24 inch <br /> bucket . Visual classification of each soil stratum encountered was <br /> made in the field by a civil engineer at the time the test pit was <br /> excavated . A description of each soil encountered is contained in <br /> the Appendix as Log of Test Pit . <br /> The surface soil. consisted of a brown silty sand that changed <br /> to a slightly silty sand with increased depth. The surface soil <br /> was underlaid by a stratum of brown well graded sand which in turn <br /> was underlaid with a stratum of slightly cemented brown silty sand . <br /> There was a slight amount, of perched water encountered on top of <br /> the cemented stratum at a .depth of 8 feet . <br /> A percolation test was performed adjacent to the existing <br /> Leach line . An 8 inch diameter test hole was excavated to a depth <br /> of 42 inches . The test hole was filled with water 24 hours prior <br /> to running the test . The test data obtained is enclosed in the <br /> Appendix.. The results of the test indicate that the soil had a <br /> percolation rate of 1.4 minutes per inch. <br /> For approximate location of both the test pit and percolation <br /> test please see the Tentative Parcel Map in the Appendix. <br /> VII CONCLUSION <br /> Based on the results of the percolation test, the soil <br /> profile , and the past performance of the existing septic system it <br /> is our opinion that the subject property is well suited for the <br /> continued use of the present septic system. <br /> Although the depth of the dry well is unknown, according to <br /> San Joaquin County Ordinance 549 , established in 1949 , the maximum <br /> depth for dry wells was established as 25 feet . Even at the <br /> maximum depth , the existing dry well should be well above the <br /> present ground water elevation. Based on this information the <br /> existing system should not adversely affect the quality of the <br /> ground water in the area. <br /> VERSslle' Q <br /> 3 D �+ZWO �SSOG <br />