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ACTON • <br /> MICKELSON • - ,, -,. . . , ,.- <br /> van DAM, INC. "':-T`f <br /> V <br /> tonsultin Scynl�sts►-Fngineers, and Geologists <br /> May 19, 1994 <br /> Mr. Kenneth Earnest <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93230 19005.08 <br /> Subject: Ground Water Monitoring Report, First Quarter 1994 <br /> Beacon Station #494 <br /> 2185 East Fremont Street, Stockton, California <br /> Dear Mr. Earnest: <br /> Acton • 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 March 25, 1994, during the first quarter of 1994. <br /> 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 /> March 25, 1994. Depth to ground water ranged from 66.98 (MW-4) to 68.90 (MW-5) feet <br /> below the top of the respective monitoring well casings. Ground water elevation increased an <br /> average of 4.62 feet between October 1993 and March 1994. Ground water level measurements <br /> from the March 24, 1994, sampling event, as well as previous ground water depth <br /> measurements, are presented in Table 1. Due to pump installation in monitoring well MW-3, <br /> ground water level measurements were not made in this well. The pump installed in monitoring <br /> well MW-3 is activated whenever water level reaches 75 feet below grade; therefore, as long <br /> as the pump is operating, the depth to water in monitoring well MW-3 will always be 75 feet <br /> or more. The minimum depth of 75.0 feet was used to infer the ground water elevation in <br /> monitoring well MW-3 under pumping conditions, presented on Figure 3. Figure 3 illustrates <br /> the inferred ground water flow on March 25, 1994. Figure 3 indicates that ground water <br /> pumping from monitoring well MW-3 has influenced the direction of ground water flow towards <br /> the center of the site. <br /> 1rpt002.maf <br /> 4511 Golden Foothill Parkway, Suite 1 (916)939-7550 <br /> El Dorado Hills, California 95762 Fax (916)939-7570 <br />