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ASSOCIATESCA <br /> I NC . <br /> and groundwater are impacted by petroleum hydrocarbons. Site activities were summarized in <br /> ATC's Summary Report of.Subsurface Investigation, dated January 15, 1999. <br /> GROUNDWATER FLOW DIRECTION <br /> Water level measurements were collected from wells MW1 through MW3 on November 17, <br /> 2000. Approximately 0.26 inches of free product was encountered in well MW2. Water levels <br /> ranged from 61.41 to 62.38 feet below the tops of the well casing elevations, representing an <br /> average increase in the water table elevation of approximately 0.02 feet since October 17, 2000. <br /> The water level data were used to develop the groundwater elevation contour map (Figure 2). <br /> Assuming that horizontal isotropic conditions prevail, groundwater in the uppermost aquifer <br /> beneath the site flowed towards the west-southwest. The average hydraulic gradient on <br /> November 17, 2000 was calculated to be 0.004 ft/ft or approximately 21.1 ft/mile. A summary <br /> of groundwater monitoring data is presented in Table 1. <br /> CONCLUSIONS <br /> The direction of groundwater flow is to the west-southwest. This is generally consistent with the <br /> previous monitoring events. Groundwater elevations have increased since October 2000. ATC <br /> is currently negotiating with nearby property owners for permission to sample their drinking <br /> water wells. ATC has scheduled the additional site investigation activities for December 4 <br /> through S, 2000. <br /> Please contact our office at (209) 579-2221 if you have any questions or comments. <br /> Respectfully submitted, <br /> ATC Associates Inc. <br /> Drew Van AllenNrE <br /> Project Manager x - <br /> KIMSEY <br /> Je e Homsey P.E. <br /> CA Registered Civil Engineer No. 47410 <br /> cc: Mr. Phil Cohn, Cohn Enterprises <br /> Mr. Warren Treisman, Attorney at Law <br /> Marty Hartzell, RWQCB <br /> w:1163931quartly111-2000.doc 2 <br />