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r• f. <br /> ACTO [p ,f, ICKWgN le 4;s AM, INC. <br /> Consulting S4ieptist�;;Engi'ne s; nd Geologists <br /> 5090 R ?3 OCT 21 FH 2: 00 <br /> Obert J. Mathews Parkway. #4- (916) 939-7550 <br /> El Dorado Hills, California 95762 Fax (916) 939-7570 <br /> October 5, 1993 <br /> Mr. Kenneth Earnest <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93230 19005.08 <br /> Subject: Ground Water Monitoring Report, Third Quarter 1993 <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 a hydrogeologic <br /> investigation of ground water conditions at Beacon Station#494, located at 2185 Fremont Street, <br /> Stockton, California (Figures I and 2). The investigation is intended to assess the distribution <br /> of petroleum hydrocarbon constituents in the ground water beneath the site. This letter report <br /> summarizes the results of ground water sampling conducted on July 27, 1993, during the third <br /> quarter of 1993. The procedures used to purge and sample monitoring wells and measure water <br /> levels are 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 July 27, <br /> 1993. Depth to ground water on July 27, 1993, ranged from 72.48 to 74.30 feet below top of <br /> casing. Ground water level measurements from the July 27, 1993, sampling-event, as well-as <br /> previous ground water depth measurements, are presented in Table 1. The inferred direction <br /> of ground water flow on July 27, 1993, was toward the northeast (Figure 3). Gradient was <br /> calculated to be approximately 0.008 ft/ft on July 27, 1993. <br /> Ground Water Sample Analytical Results <br /> Ground water samples were collected from monitoring wells MW-1 through MW-5 on July 27, <br /> 1993, using the procedures outlined in Enclosure A. Field observations and ground water <br /> sampling documentation are presented in Enclosure B. The July 27, 1993, ground water <br /> 1 sampling event was witnessed by Mr. Michael J. Infurna, Jr., Public Health Services, County <br /> LR MIS.SCD <br />