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i <br /> ACTON <br /> MICKELSON • <br /> van DAM, INC. <br /> Consulting Scientists, Engineers, and Geologists <br /> August 2, 1994 RECEIVED <br /> AUG 0 5 1994 <br /> Mr. Kenneth Earnest ENVIRONMENTAL HEALTH <br /> Ultramar Inc. PERMIT/SERVICES <br /> 525 West Third Street <br /> Hanford, California 93230 19005.08 <br /> Subject: Ground Water Monitoring Report, Second Quarter 1994 <br /> Beacon Station #494 <br /> 2185 East Fremont Street, Stockton, California <br /> Dear Mr. Earnest: <br /> I <br /> Acton a Mickelson • van Dam, Inc. (AMV), has been authorized to continue quarterly <br /> monitoring of ground water conditions at Beacon Station #494, located at 2185 Fremont Street, <br /> Stockton, San Joaquin County, California (Figures 1 and 2). This letter report summarizes the <br /> results of ground water sampling conducted on May 31, 1994, during the second quarter of <br /> 1994. The procedures used to purge and sample monitoring wells and measure water levels are <br /> described in Enclosure A. <br /> Ground Water Level Measurements, Hydraulic Gradient, and Flow Direction <br /> Depth to ground water was measured in monitoring wells MW-1 through MW-5 on <br /> May 31, 1994. Depth to ground water ranged from 66.06 (MW-4) to 68.02 (MW-5) feet below <br /> the top of the respective monitoring well casings. Ground water elevation increased an average <br /> of 0.84 foot between March and May 1994. Ground water level measurements from the <br /> May 31, 1994, sampling event, as well as previous ground water depth measurements, are <br /> presented in Table 1. Due to pump installation in monitoring well MW-3, ground water level <br /> measurements were not made in this well. The pump installed in monitoring well MW-3 is <br /> activated whenever water level reaches 75 feet below grade; therefore, as long as the pump is <br /> operating, the depth to water in monitoring well MW-3 will always be 75 feet or more. The <br /> minimum depth of 75.0 feet was used to infer the ground water elevation in monitoring well <br /> MW-3 under pumping conditions as represented on Figure 3. Figure 3 illustrates the inferred <br /> ground water flow pattern on May 31, 1994. Figure 3 indicates that ground water pumping <br /> from monitoring well MW-3 has influenced the direction of ground water flow towards the <br /> center of the site. <br /> 1ipt026.maf <br /> 4511 Golden Foothill Parkway,Suite 1 (916) 939-7550 <br /> El Dorado Hills,California 95762 Fax (916) 939-7570 <br />