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ALS <br /> ye <br /> j•} <br /> Drinking Water Action Level for TBA, 12 µg/L, was exceeded in the groundwater samples collected <br /> from MW1, MW2, MW3, and MW7 A summary of the laboratory analytical data is presented in <br /> Table 2 A copy of the laboratory analytical report is included in Attachment 2 An isoconcentration <br /> map depicting MTBE concentrations in the groundwater samples collected during the third quarter <br /> 2005 is shown on Figure 4 <br /> GEOTRACKER DATA UPLOAD <br /> The depth to water and the laboratory data were submitted electronically to the State Water <br /> Resources Control Board (SWRCB) Geotracker database (confirmation numbers 6055129826 and <br /> 2188600540, 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 April 2005 monitoring event The laboratory <br /> analytical results of the groundwater samples collected from MWl through MW7 are generally <br /> similar to the results of the groundwater samples collected from these wells in April 2005 TPHg and <br /> BTEX constituents generally increased in concentration with respect to recent sampling events in all <br /> of the samples except for the groundwater sample collected from MW4, TPHg and BTEX remain <br /> undetected in groundwater samples collected from this well <br /> RECOMMENDATIONS <br /> Based on the results of the third 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 October 2005 <br /> s lenvironmentai1224931Reporlsl3QR-05 doc 4 <br />