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kn KLEINFELDER File No.: 20-2314-01ND o August 10, 1988 AUG ENVIROMENTAL HEALTH F ERM IT/SERVICES Zagaris Management Services 1230 Orangeburg Modesto, CA 95350 Attention: Mr. Dave von Savoye Subject: PERCOLATION TESTS 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 and 28, 1988 reports. A plot plan and vicinity map showing the approxi- mate locations of the proposed subdivision and percolation test locations are presented on Plate I of our July 11, 1988 report. Six percolation tests were set up on August 3, 1988, by representatives of our firm. The tests were performed at locations 1, 11, 12, 14, 17 and 20, which are shown on Plate I of our July 11, 1988 report. The test holes were drilled to depths of 10 feet and had a diameter of 6 inches. PVC pipe was then inserted into the test holes and approximately 6 inches of gravel 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 August 9, 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 1-1/2 to 24 minutes per inch. 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