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CvvATC <br /> A S S O C I A T E S I N C <br /> I <br /> GROUNDWATER FLOW DIRECTION <br /> Water level measurements were collected from wells MW1 through MW3 on October 8, 1999 <br /> Water levels ranged from 24 39 to 25 00 feet below the tops of the well casings elevation, <br /> representing an average decrease in the water table elevation of approximately 2 54 feet since <br /> February 1999 The water level data were used to develop the groundwater elevation contour <br /> map (Figure 3) Assuming that horizontal isotropic conditions prevail, groundwater in the <br /> uppermost aquifer beneath the site flowed towards the north-northeast The average hydraulic <br /> gradient on October 8, 1999 was calculated to be 0 001 ft/ft or approximately 5 ft/mile A <br /> summary of groundwater monitoring data is presented in Table 1 <br /> CONCLUSIONS <br /> Concentrations from wells MW 1 through MW3 remain consistent with the results from the <br /> previous sampling event The direction of groundwater flow is consistent with the previous <br /> event Groundwater elevations have decreased since February 1999 <br /> RECOMMENDATIONS <br /> Based on the results of the third quarter 1999 monitoring episode, we recommend the following <br /> • Perform Fourth Quarter 1999 groundwater monitoring event in December 1999 <br /> Groundwater samples should be analyzed for TPHg and BTEX <br /> Please contact our office at (209) 579-2221 if you have any questions or comments <br /> Respectfully submitted, <br /> ATC <br /> Associates tes Inc <br /> �t',� <br /> Drew Van Allen <br /> Project Manager <br /> �l <br /> I-Xp. .1 . <br /> Jeanne Homsey, <br /> CA Registered Civil Engineer No 47410 CiV11ILL <br /> cc Mr Paul Van Dyken, Sr , N & S Irrigation OF <br /> Mark List, RWQCB <br /> w 1149811quan1yl3gr-1999 doc 3 <br />