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013-040-52 Michael & K. Luiz , 18880 North Ray Road <br /> Septic system is 4 years old <br /> No problems with leach area <br /> Depth to ground water unknown <br /> 013-040-53 Everett & L . Luiz , 18721 North Ray Road <br /> Original septic system was 64 years old <br /> when replaced <br /> New system is 8 years old <br /> No problems with leach area <br /> Depth to ground water is unknown <br /> GROUND WATER <br /> From the San Joaquin County Flood Control and Water <br /> Conservation District Study we find that the ground <br /> water depth is approximately 20 feet and that the <br /> gradient falls westerly at approximately feet per <br /> mile . See Exhibits 2 and 3. <br /> SOILS AND PERCOLATION TEST <br /> Per the "Soils of San Joaquin County" , as published by <br /> the University of California , the soil is Hanford Sandy <br /> Loam. <br /> On July 17 , 1992, we ran percolation tests on Parcels 1 <br /> and 2. It was found that the percolation rates were 12 <br /> and 16/min/inch respectively. See Exhibit 4. <br /> In all cases the test holes were 6" diameter by 3 feet <br /> deep. The tests were run under permit and inspection <br /> by the San Joaquin County Health Department . <br /> CONCLUSION <br /> The area is suitable for septic systems. It is <br /> recommended that 8,000 S.F. be reserved on Parcels 1 <br /> and 2. Seepage pits should not be allowed . <br /> Based upon the percolation test and interviews, it is <br /> my professional opinion that a septic system will not <br /> adversely effect the first water aquifer . <br /> LIMITATIONS <br /> The conclusions of this report are based on the <br /> information provided regarding the existing and <br /> proposed development , and on the site conditions as <br /> they existed at the time we performed the percolation <br /> test . It was assumed that the test hole and <br /> percolation test results are representative of an <br /> average of the subsurface conditions in the general <br /> area . <br />