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GROUND WATER <br /> The owner stated that the ground water on-site is <br /> thirty 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 four feet/mile, <br /> falling westerly . (Exhibit 3) . <br /> The owners contacted F .G.L . Laboratory to take and test <br /> their water . The results are attached as Exhibits 4 <br /> and D. <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 <br /> Loamly Sand . <br /> Under permit from the San Joaquin County Health <br /> Department , percolation tests were run September 19, <br /> 1992. The tests passed with results as shown on <br /> Exhibit 6 and 7 . <br /> Test 1 was near the home (Parcel 1 ) and percolated at <br /> 48 minutes/inch. This is compatible with the septic <br /> system, history and soil type. <br /> Test 2 was run near the home (Parcel 2) and percolated <br /> at 16 minutes/inch. <br /> Test 3 was run in the vineyard and percolated at 20 <br /> minutes/inch. <br /> Based upon the range of the percolation test results <br /> the following recommendations are conservative. <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 Parcels 2 & 3 and 12,000 S.F . be retained for leach <br /> field for Parcel 1 . <br />