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Io- $ATC . <br /> ASSOCIATES 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 MW through MW3 on October 17, 2000. <br /> Approximately 0.44 inches of free product was encountered in well MW2. Water levels ranged <br /> from 61.34 to 62.42 feet below the tops of the well casing elevations; representing an average <br /> decrease in the water table elevation of approximately 1.30 feet since August 22, 2000. The <br /> 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 October' <br /> 17, 2000 was calculated to be 0.007 ft/ft or approximately 37.0 ft/mile. A summary of <br /> 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 decreased since August 2000. ATC is <br /> currently negotiating with nearby property owners for permission to sample their-drinking water <br /> wells.' ATC has scheduled the additional site investigation activities for December 4 through S, <br /> 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 /> V � <br /> /UJW <br /> Drew Van Allen - <br /> Project Manager <br /> Jeanne Homsey, EA . z o <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:1163931quartly110-2000.doe 2 <br />