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KLEINFELDER <br /> An emP�oree nHmrd mmpeny <br /> File No. 13384.602 <br /> March 22, 2002 <br /> Mr. Ian Wiebenga <br /> Calaveras Materials, Inc. <br /> 1945 Lathrop Road <br /> Lathrop, California 95330 <br /> Subject: PERCOLATION TEST RESULTS <br /> PROPOSED CONCRETE BATCH PLANT <br /> 28983 SOUTH MCARTHUR DRIVE <br /> TRACY, CALIFORNIA <br /> Dear Mr. Wiebenga: <br /> As requested, this letter presents the results of our percolation tests performed in the leach field <br /> area for the proposed concrete batch plant in order to complete the soil suitability study for the <br /> subject project. We reference our letter of March 15, 2002, for information regarding the <br /> proposed development, present use of the site, historical groundwater depths in the project area, <br /> our evaluation for nitrate-loading, and the results of chemical tests performed on groundwater <br /> samples. <br /> The percolation tests were performed in accordance with accepted guidelines using clear,potable <br /> water. The procedure calls for first placing about 2 inches of fine gravel at the bottom of the <br /> bore hole, installing a perforated PVC casing, and then placing additional gravel. The holes were <br /> then pre-soaked with water at least 24 hours prior to performing the tests. The tests are <br /> performed by first adding about 6 to 12 inches of water to the hole. From a fixed reference <br /> point, the drop in water level was measured in approximate 30-minute intervals for 4 hours, <br /> refilling as necessary to maintain the original head of water over the gravel. Under the <br /> observation of a sanitarian from the San Joaquin County Public Health Department, the last 30- <br /> minute reading of the monitoring period was recorded and used to calculate the percolation rate <br /> in minutes per inch. The estimated percolation rates at each test location are as summarized <br /> below. A copy of our field percolation test results is attached. <br /> Test Number Depth, ft. Percolation Rate min./inch <br /> P-1 3.5 15 <br /> P-2 10 8 <br /> P-3 15 7 <br /> 13384.G02/2002R289 March 22,2002 <br /> ©2002 Kleinfelder,Inc. Page 1 of 2 <br /> KLEINFELDER 2825 East Myrtle Street,Stockton,CA 95205-4794 (209)948-1345 (209)948-0621 fax <br />