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Mr Terry Tardin <br /> August 17, 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 /> 1'qtr,01 2nd qTr,Ol 1"qtr,01 2"d tr,01 1tt Er,01 2"d r,O1 <br /> Highest concentration,(}t /L) 1,900 650 390 190 1,900 5,800 <br /> Well with highest concentration MW 3 MW 3 MW 3 MW 3 MW 1 MW-1 <br /> Number of wells with detection 2/4 1/4 3/4 1/4 2/4 4/4 <br /> Discussion: <br /> Based on this quarter's data, groundwater flows southwest under a hydraulic <br /> gradient of approximately 0 002 as shown in Figure 2 Benzene <br /> concentrations remained consistent with the previous quarter in wells MW-1, <br /> MW-2 and MW-4, and decreased slightly in well MW-3 Toluene, <br /> ethylbenzene, and total xylenes concentrations remained consistent with <br /> historical results in all four wells TPH-G concentrations were below the <br /> laboratory reporting limit of 2,000 ug/L in MW-1, decreased in MW-3 and <br /> were not detected in MW-2 and MW-4 Due to the elevated concentrations of <br /> MTBE in the sample from MW-1, the method reporting limit for BTEX, <br /> . TPH-G, and MTBE were increased due to sample dilution The dilution is <br /> necessary because the MTBE concentration is out of the calibration range for <br /> the target analyte MTBE concentrations increased 1n MW-1 and MW-3, <br /> remained consistent with previous quarter's results in MW-2, and decreased <br /> in MW-4 <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 Isoconcentration Map, <br /> May 18, 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 /> Thu 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 which was authorized This 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\2nd 01gtr doc <br />