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GROUND WATER <br /> The owner stated that the ground water on-site is <br /> approximately twenty feet below the surface. <br /> From the San Joaquin County Flood Control and Water <br /> Conservation Study, we find that the ground water depth <br /> is approximately twenty-two feet (Exhibit 2) and that <br /> the water gradient is approximately eight feet/mile, <br /> westerly . (Exhibit 3) . <br /> The owners contacted F.G.L . Laboratory to take and test <br /> their water . The results are attached as Exhibits 4a <br /> and 4b. <br /> SOILS AND PERCOLATION TESTS] <br /> Per the "Soils of San Joaquin County" as published by <br /> the University of California , the soil is Hanford Sandy <br /> Loam. <br /> Under permit from the San Joaquin County Health <br /> Department , percolation tests were run September 22, <br /> 1992. The tests passed with results as shown on <br /> Exhibit 5. <br /> Test 1 was near the home (Parcel 1 ) and percolated at <br /> 27 minutes/inch. This is compatible with the septic <br /> system, history and soil type. <br /> Test 2 was run in the vineyard ( Parcel 1 ) and <br /> percolated at 17 minutes/inch. <br /> CONCLUSION <br /> Based upon the percolation test results, interviews and <br /> soil type, it is my opinion that the subject property <br /> is suitable for septic tank and leach field , and that <br /> the use of the septic system should not degrade the <br /> existing groundwater at the density proposed . I also <br /> recommend that 10,000 S. F . be retained for leach field <br /> for Parcel 1 and 8,000 S.F . be retained for leach field <br /> for Parcel 2. <br />