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v TC . <br /> A S S O C I A T E S I N C . <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 August 22, 2000. <br /> Water levels ranged from 60.01 to 61.11 feet below the tops of the well casing elevations, <br /> representing an average decrease in the water table elevation of approximately 1.5 S feet since <br /> July 14, 2000. The water level data were used to develop the groundwater elevation contour map <br /> (Figure 2). Assuming that horizontal isotropic conditions prevail, groundwater in the uppermost <br /> aquifer beneath the site flowed towards the southwest. The average hydraulic gradient on August <br /> 22, .2000 was calculated to be 0.005 ft/ft or approximately 26.4 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 southwest. This is generally consistent with the <br /> previous monitoring events. Groundwater elevations have decreased since July 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 Allen <br /> r �w - <br /> Project Manager � ' � :{� <br /> EMP>V <br /> Jeanne Homsey, 0 � :}. <br /> CA Registered Civil Engineer No. 47410 p' <br /> cc: Mr. Phil Cohn 'S OF <br /> Mr. Warren Treisman <br /> Marty Hartzell, RWQCB <br /> wA 163931quan1yl8-2000.doc 2 <br />