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CVV: <br /> o V <br /> • A S S O C I A T E S I N C <br /> contained no detectable concentrations of oxygenate fuel additives Analytical results of � <br /> groundwater samples are summarized in Table 2 Laboratory data sheets and chain-of-custody <br /> documentation are contained in Attachment 2 <br /> GROUNDWATER FLOW DIRECTION <br /> r <br /> Water level measurements were collected from wells MW1 through MW10 on April 4, 2002 <br /> Water levels ranged from 62 03 to 64 05 feet below the tops of the well casing elevations, <br /> representing an average increase in the water table elevation of approximately 1 65 feet since <br /> December 2001 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 mounds around well MW7 A summary of groundwater <br /> monitoring data is presented in Table 1 <br /> FREE PRODUCT REMOVAL <br /> Floating petroleum product has previously been observed in well MW2 On January 18, 2002, <br /> ATC installed a passive skimmer system in well MW2 in accordance with ATC's Workplan for <br /> Drinking Water Well Replacement, Temporary Water Source, and Free Product Skimmer <br /> . Installation at Pacific Coast Recreation, 3755 Munford Avenue, Stockton, California, dated <br /> October 11, 2001 This workplan was approved by SJCEHD with minor modifications <br /> On January 18 and February 15, 2002, only a slight, unmeasurable sheen was observed in well <br /> MW2 No free product was recovered from the well because the quantity was too small to be <br /> collected into a baler Table 3 summarizes the product thickness measurements and volume of <br /> product removed to date <br /> detlrAIA dv <br /> CONCLUSIONS 9 % <br /> Concentrations from wells MW1 through MW6 and MWS through MW10 remain consistent <br /> with the results from the previous sampling event Concentrations in well MW7 increased by at <br /> least one order of magnitude The direction of groundwater flow was not discernable due to <br /> mounding around well MW7 Groundwater elevations have increased since December 2001 <br /> • <br /> w U63931quartly\Igr-2002 doe 3 - <br />