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' 21 December 2001 <br /> i AGE-NC Protect No 96-0254 <br />' Page 4 of 4 <br />' The prevailing ground water flow direction at the site is generally toward the north which is <br /> consistent with the previously determined flow directions <br /> • Petroleum hydrocarbon-impacted ground water was encountered in samples from momtonng <br />' wells MW-1B, MW-4 and MW-7 with benzene concentrations exceeding the State of <br /> California maximum contaminant level(MCL)of 1 gg/l in samples collected from the wells <br />' Low concentration of MTBE was detected in the ground water samples collected from <br /> MW-1B and MW-4 The MTBE concentrations did not exceed the State of California <br /> primary maximum contaminant level (MCL) of 13 ppb In general, overall hydrocarbon <br />' concentrations have increased slightly this quarter Isocontour maps illustrating the <br /> approximate distribution of dissolved TPH-g, benzene and MTBE in the shallow screened <br /> wells are presented in Figures 4, 5, and 6 <br /> 1 <br />' 5.0. RECOMMENDATIONS <br /> Based on the results of this investigation, AGE recommends, continued quarterly ground water <br />'• monitoring at the site The next monitoring event should be scheduled for January 2002 <br /> Additionally, AGE recommends analysis of water samples for ethylene dibromide and <br />' 1,2-dichloroethane and the preparation of a Corrective Action Plan (CAP) as discussed during a <br /> meeting with San Joaquin County PHS-EHD on 02 November 2001. <br /> 6.0. LIMITATIONS <br /> I Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based mainly <br /> upon analytical results provided by an independent laboratory Evaluation of the <br /> geologic/hydrogeologic conditions at the site for the purpose of this investigation are made from a <br /> limited number of available data points(i a monitoring well ground water samples),and subsurface <br /> conditions may vary away from these data points No other warranty, expressed or implied,is made <br /> as to the professional recommendations contained in this report <br /> Advanced GeoEnvironmental Inc <br /> I <br />