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e <br /> Mr Terry Tarditi <br /> October 5, 2001 <br /> • Page 3 <br /> Table 4. Comparison of Groundwater Analytical Results <br /> with Previous Sampling Event <br /> TPH G Benzene MTBE 8260 B <br /> 2"d 9tr,01 3`dqtr,01 —2. qtr,01 3rd qtr,01 2nd tr,01 3rd QIr,01 <br /> Fli hest concentration,(µ L) 650 240 190 72 5,800 1,900 <br /> Well with iu hest concentration MW 3 MW-3 MW 3 MW 3 MW 1 MW 1 <br /> Number of wells with detection 1/4 2/4 1/4 1/4 4/4 3/4 <br /> Discussion- <br /> Based on this quarter's data, the groundwater table is generally flat The <br /> hydraulic gradient was not calculated and groundwater elevation contours <br /> were not shown on Figure 2 due to relatively flat groundwater surface <br /> Benzene concentrations were measured above detection levels in only MW-3 <br /> Toluene, ethylbenzene, and total xylenes concentrations were not detected in <br /> any of the four wells TPH-G concentrations were above the laboratory <br /> reporting limit in MW-3 and MWA and were not detected in MW-1 and <br /> . MW-2 Due to the elevated concentrations of MTBE in the sample from MW- <br /> 1, the method reporting limit for BTEX, TPH-G, and MTBE were increased <br /> due to sample dilution The dilution is necessary because the MTBE <br /> concentration is out of the calibration range for the target analyte MTBE <br /> concentrations decreased in all four wells <br /> The following documents are enclosed with this letter <br /> Figure 1 Site Map <br /> Figure 2 Groundwater Elevation Contour Map, May 18, 2001 <br /> Figure 3 Groundwater Constituent and Isoconcent ration Map, <br /> August 20, 2001 <br /> Table 1 Historical Groundwater Elevation Data <br /> Table 2 Groundwater Flow Direction and Gradient <br /> Table 3 Groundwater Analytical Data <br /> Table 4 Comparison of Groundwater Analytical Results with Previous <br /> Sampling Event <br /> Attachment A Field Data Sheets <br /> Attachment B Laboratory Analytical Reports <br /> This report was prepared in accordance with the standards of the environmental consulting industry at the time it was <br /> prepared It should not be relied upon by parties other than those for whom it was prepared,and then only to the extent of <br /> the scope of work whish was authorized Thu report does not guarantee that no additional environmental contamination <br /> beyond that described in this report exists at the site <br /> P\21000\21417\Reports\3rd-0igtr doc <br />