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ACTON • <br /> MICKELSON • APR 2 01995 <br /> van DAM, INC. VIRONMENTAL HEALTH • <br /> Consulting Scientists, Engineers, and Geologists <br /> April 13, 1995 <br /> Mr Kenneth Farnest <br /> Ultramar Inc <br /> 525 West Third Street <br /> Hanford, California 93230 19005 0817 <br /> Subject Ground Water Monitoring Report, First Quarter 1995 <br /> Former Beacon Station #494, 2185 East Fremont Street, Stockton, California <br /> Dear Mr Earnest <br /> Acton • Mickelson • van Dam, Inc (AMV), has been authorizers to continue quarterly <br /> monitoring of ground water conditions at former Beacon Station ##494, located at 2185 East <br /> . Fremont Street, Stockton, San Joaquin County, California (Figures 1 and 2) This letter report • <br /> summarizes the results of ground water sampling conducted on March 2, 1995, during the first <br /> quarter of 1995 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, MW-2, MW-4, and MW-5 <br /> on March 2, 1995 Depth to ground water ranged from 64 79 (MW-4) to 66 59 (MW-5) feed <br /> below the top of the respective monitoring well casings Ground water elevations increased an <br /> average of 3 30 feet between the last sampling event in November 1994 and March 1995 <br /> Ground water level measurements from the March 2, 1995 sampling event, as well as previous <br /> ground water depth measurements, are presented in Table 1 Due to pump installation in <br /> monitoring well MW-3, ground water level measurements were not made in this well The <br /> pump installed in monitoring well MW-3 is activated whenever water level reaches 75 feet below <br /> grade, therefore, as long as the pump is operating, the depth to water in monitoring well MW-3 <br /> will always be 75 feet or more The minimum depth of 75 0 feet was used to infer the ground <br /> water elevation in monitoring well MW-3 under pumping conditions as represented on Figure <br /> 3 Figure 3 illustrates the inferred ground water flow pattern on March 2, 1995 Figure 3 <br /> indicates that ground water pumping from monitoring well MW-3 has influenced the local <br /> direction of ground ter flow toward the center of the site <br /> Irpt053 dmc <br /> 4511 Golden Foothill Parkma1, Suite 1 (916) 939-7550 <br /> Fl Dorado Hills,California 95762 Fax(916) 939-7570 <br />