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(VY <br /> o W(: <br /> • A S S O C I A T E S I N C <br /> California Drinking Water Action Level for TBA, 12 pg/L, was exceeded in the groundwater <br /> samples collected from MW1, MW2, MW3, and MW7 A summary of the laboratory analytical data <br /> is presented in Table 2 A copy of the laboratory analytical report is included in Attachment 2 An <br /> isoconcentration map depicting MTBE concentrations in the groundwater samples collected during <br /> the first quarter 2005 is shown on Figure 4 <br /> GEOTRACKER DATA UPLOAD <br /> The depth to water and the laboratory data was submitted electronically to the State Water Resources <br /> Control Board (SWRCB) Geotracker database (confirmation numbers 4816990494 and 5893372237, <br /> respectively) Documentation of the data submittal is contained in Attachment 3 <br /> CONCLUSIONS <br /> Groundwater flow direction and gradient are generally consistent with previous sampling events <br /> Water table elevations have decreased since the October 2004 monitoring event The laboratory <br /> analytical results of the groundwater samples collected from MW1 through MW7 are generally <br /> similar to the results of the groundwater samples collected from these wells in October 2004 <br /> RECOMMENDATIONS <br /> • Based on the results of the first quarter 2005 monitoring event, we recommend continued quarterly <br /> groundwater monitoring and evaluating remedial action alternatives for the site The next quarterly <br /> sampling event is scheduled for April 2005 <br /> Please contact our office at(209) 579-2221 if you have any questions or comments <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> David Scrimger <br /> Staff Scientist � O �,}r <br /> ta.� rtlt' 'Sx "' <br /> rzf yyh5� "i/ fc <br /> Jeanne Homsey, P E <br /> CA Registered Civil Engineer No 47410 <br /> cc Mr Robert Eggiman <br /> Jim Barton, RWQCB <br /> 10 <br /> s Ienvironmental1224931ReportsUQR-05 doc 4 <br />