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s <br /> A S S O C I A T E S I N C <br /> CONCLUSIONS <br /> Concentrations from wells MW1 and MW3 remain consistent with the results from the previous <br /> sampling event Concentrations of TPHg in well MW2 increased by one order of magnitude <br /> The direction of groundwater flow has changed from southwest In the previous monitoring event <br /> to northwest in this monitoring event Groundwater elevations have increased since November <br /> 1998 <br /> RECOMMENDATIONS <br /> Based on the results of the second quarter 1999 monitoring episode, we recommend the <br /> following <br /> o Perform additional site investigation activities to determine the lateral extent of impacted <br /> soil and groundwater and the vertical extent of impacted groundwater <br /> a Conduct the Third Quarter 1999 groundwater monitoring and sampling of wells MW1 <br /> through MW3 and analyze samples for TPHg, BTEX, and oxygenate fuel additives <br /> Please contact our office at (209) 579-2221 if you have any questions or comments <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> bLt"'j L <br /> Drew Van Allen Q4FSl�r� <br /> Staff Scientist <br /> ✓r i"D"'t, <br /> ..1,.f <br /> �L 1• t +3 .r Z,r +1 <br /> Jeanne Hamsey, Z:-),P I z li <br /> CA Registered Civil Engineer No 47410 <br /> cc Mr Phil Cohn ��� ,;��1�'"`� <br /> Mr Hanan Fradk>n <br /> Mark List, RWQCB <br /> W 1163931quanly12gr-1999 doe 3 <br />