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(YVATC <br /> A S S O C I A T E S I N C <br /> GROUNDWATER FLOW DIRECTION <br /> Water level measurements were collected from wells MWI through MW3 on December 30, <br /> 1999 Water levels ranged from 24 45 to 25 03 feet below the tops of the well casings elevation, <br /> representing an average decrease in the water table elevation of approximately 0 03 feet since <br /> October 1999 The water level data were used to develop the groundwater elevation contour map <br /> (Figure 3) Assuming that horizontal isotropic conditions prevail, groundwater in the uppermost <br /> aquifer beneath the site flowed towards the north The average hydraulic gradient on December <br /> 30, 1999 was calculated to be 0 0004 ft/ft or approximately 2 ft/mile A summary of <br /> groundwater monitoring data is presented in Table 1 <br /> CONCLUSIONS <br /> Concentrations from wells MWI through MW3 remain consistent with the results from the <br /> previous sampling event The direction of groundwater flow is generally consistent with the <br /> previous event Groundwater elevations have decreased since October 1999 <br /> RECOMMENDATIONS <br /> • Based on the results of the fourth quarter 1999 monitoring episode, we recommend the <br /> following <br /> • Perform First Quarter 2000 groundwater monitoring event in March 2000 Groundwater <br /> 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 Associ tes Inc <br /> nn <br /> 0�— <br /> Drew Van Allen <br /> Project Manager <br /> JEMNE <br /> Je e Hornsey, c� <br /> HOMSEY <br /> CA Registered Civil Engineer No 47410 0' NO- CO47410 <br /> Jy ERPF 12 b <br /> cc Mr Paul Van Dyken, Sr ,N & S Irrigation <br /> Marty Hartzell, RWQCB 9 CA���Q�C� <br /> w\1498I\quart1yl4gr-1999 doc 3 <br />