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k" KLE1 N FELDER File No.: 20-2314-01 July 28, 1988 Zagaris Management Services 1230 Orangeburg � ' `�` � I Modesto, CA 95350 Attention: Mr. Dave von Savoye ENVIROVE.,,'TAL HE-ALTH Subject: PERCOLATION TESTS FERIAII/SERVICLS NORTH MORADA ESTATES SAN JOAQUIN COUNTY, CA Gentlemen: Presented in this letter are the results of our percolation testing performed for the north Morada Estates Subdivision located between Eight-Mile and Quashnick Roads just east of Highway 99 in San Joaquin County, California. The tests performed at this time were a result of failing tests as reported in our July 11, 1988 report. A plot plan and vicinity map showing the approximate locations of the proposed subdivision and percolation test locations are pre- sented on Plate I of our July 11, 1988 letter. Nine percolation tests were set up on July 21, 1988, by representatives of our firm. The tests were performed at locations 1, 3, 11, 12, 14, 1% 20, 21 and 22 which are shown on Plate I of our July 11, 1988 letter. The test holes were drilled to depths of 8 feet and had a diameter of 6 inches. PVC pipe was then inserted into the test holes and approximately 2 inches of clean sand was placed on the soil surface within the pipe to avoid disturbance of the soil when the water was poured into the pipe. The test holes were filled with approximately 3 feet of relatively clean water the day before they were to be performed and left to soak overnight. On July 26, 1988, a representative of our firm returned to the site to perform the percolation tests. The tests were performed according to guidelines established by San Joaquin County officials. The percolation tests were measured to have percolation rates of from 11-1/2 minutes per inch to no per- colation. The results of the percolation tests are presented on Table I. Copies of the county approved test sheets are attached to this letter. KLEINFELDER 2825 East Myrtle Street, Stockton, CA 95205 (209) 948-1345