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' h'q KLEINFELDER <br /> concentration of TPH-G and benzene in the December 2001 sampling event decreased <br /> approximately 75 percents, as compared to the August 2001 sampling event <br />' The December 2001 sampling event revealed to date the highest concentrations of TPH-G in <br /> MW-3, and the second highest benzene concentration Based on review of historical data, it is <br />' Kleinfelder's opinion that this is likely a result of a change in groundwater flow direction as <br /> illustrated on Plate 4 and Table 2 Groundwater flow during the December 2001 sampling event <br /> was east by southeast The only other sampling event with a similar groundwater flow direction <br />' was in December 2000, when groundwater flow was calculated to the east During the December <br /> 2000 sampling event, TPH-G was also relatively elevated in MW-3 (The second highest TPH-G <br /> concentration from groundwater collected from MW-3 to date) <br />' Based upon this data it appears that the overall petroleum constituents in the contaminant plume <br /> have decreased, with an increase of petroluem constituents in groundwater from MW-3, <br /> apparently from a change in groundwater flow direction <br /> For a review of historical laboratory analyses conducted, refer to Table 1 Copies of the <br />' laboratory data sheets along with the laboratory reporting limits are presented in Attachment C <br /> Kleinfelder recommends that a copy of this report be submitted to the San Joaquin County Public <br /> Health Services, Environmental Health Division (PHS/EHD) for their review and comment if <br /> necessary <br />' 20-4419-01 E03/2002RO10 Page. 5 of 7 <br /> Copp fight 2002 KleinFLI&I Inc January 23, 2002 <br />