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Six inch diameter by three feet deep test holes were dug on <br /> the property and percolation tests were run under the <br /> supervision of San Joaquin County Health Department . <br /> The first test was run on the East side of the house. The <br /> test hole was very hard to dig , but percolated well until <br /> the last '/ hour when the water level only dropped 1/8 inch. <br /> The test failed . The next hole was dug farther South but <br /> because the ground was very hard it was abandoned . <br /> We then went Northeast of the house . The ground was easier <br /> to dig and the percolation rate was 19 min/inch. See <br /> Exhibit 3 . <br /> Because of the soil inconsistency , I recommend at least <br /> 10,000 square feet located North and East of the house be <br /> reserved for leach field expansion/replacement . <br /> WATER GRADIENT <br /> The terrain is rolling , sparcely settled , and there are few <br /> wells that could be sounded . None were. <br /> Based upon the San Joaquin County Flood Control and Water <br /> Conservation study ( See Exhibit 4 ) the water gradient <br /> drops southwesterly at about ten feet per mile. <br /> WATER QUALITY <br /> The client had the water analyzed about ten months ago. <br /> The results of those tests are presented in Exhibit 5. <br /> CONCLUSION <br /> Based upon the results of the percolation tests , <br /> interviews, and other data, it is my opinion that the <br /> subject property is suitable of septic systems and that the <br /> use of septic systems will not adversely affect the quality <br /> of ground water . <br /> Because of soil inconsistency , I conservatively recommend <br /> that 10,000 S.F . be reserved for leach fields . <br />