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ASSOCIATESA. <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 July 14, 2000. <br /> Water levels ranged from 58.36 to 59.4.9 feet below the tops of.the well casing elevations, <br /> representing an average decrease in the water table elevation of approximately 0.10 .feet since <br /> May 30, 2000. The water level data were used to develop the groundwater elevation contour <br /> map (Figure 2). Assuming that horizontal isotropic conditions prevail, groundwater in the <br /> uppermost aquifer beneath the site flowed towards the south. The.average hydraulic gradient on <br /> July 14, 2000 was calculated to be 0.01 ft/ft or approximately 52.8 R/mile. A summary of <br /> groundwater monitoring data is presented in Table 1. <br /> CONCLUSIONS <br /> The direction of groundwater flow is consistent with the previous monitoring event, to south in <br /> this monitoring event. Groundwater elevations have decreased since May 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 /> D <br /> Drew Van Allen <br /> Project Manager <br /> JEAN <br /> Jeanne Homsey, c ; i <br /> CA Registered Civil Engineer No. 47410 l � �r ��., <U4 t-,��� � <br /> y I�4' " <br /> cc: Mr. Phil Cohn Ems. <br /> Mr. Hanan FradkintX". � �`�- <br /> Marty Hartzell, RWQCB <br /> ��• x5 <br /> wA l 63931quart1yl7-2000.doc 2 <br />