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File No. 20-2982-02 <br /> July 20, 1990 <br /> On July 12 , 1990, the 3-foot deep test holes were filled <br /> with relatively clean water and left to soak overnight. <br /> On July 13 , 1990, a representative of our firm returned <br /> to the site to perform the 3-foot deep percolation tests. <br /> As per San Joaquin County guidelines, the tests were <br /> performed for periods of from 30 minutes to 4 hours. The <br /> last 30 minutes of each test were used to calculate the <br /> percolation rates. In order to use standard leach lines, <br /> the County requires a percolation rate of 60 minutes per <br /> inch or faster at the 3-foot depth. All of the 3-foot <br /> deep tests performed passed. Therefore, the deeper <br /> percolation tests were not required and the test holes <br /> were backfilled. Table I summarizes the test results <br /> obtained. The County approved field test sheets are <br /> included with this report. <br /> TABLE I <br /> PERCOLATION TEST RESULTS <br /> TEST DEPTH PERCOLATION RATE <br /> PARCEL(TEST) NOS. (FEET) (MINUTES/INCH) <br /> 1 (P-1) 3 7-1/2 <br /> 2 (P-3) 3 15 <br /> 3 (P-2) 3 60 <br /> 3 <br />