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Mr Terry Tarditi <br /> Y March 14, 2001 <br /> Page 3 <br /> Discussion. <br /> Based on this quarter's data, groundwater flows southwest under a hydraulic <br /> gradient of approximately 0 001 Benzene concentrations decreased in well <br /> MW-3 from the previous quarter, increased in wells MW-1 and MW-4, and <br /> were not detected in the sample from MW-2 Toluene, ethylbenzene, and <br /> total xylenes concentrations remained consistent with the previous quarter's <br /> results in MW-1, MW-2 and MW-4, but toluene and total 7lenes decreased <br /> slightly in MW-3 TPH-G decreased in MW-3 and MW-4, but increased in <br /> MW-1 TPH-G was not detected in MW-2 MTBE concentrations increased <br /> slightly in MW-2 and MW-4, but decreased in MW-1 and MW-3 <br /> The following documents are enclosed with this letter <br /> Figure 1 Site Map <br /> Figure 2 Groundwater Elevation Contour Map,July 21, 2000 <br /> Figure 3 Groundwater Constituent and Isoconcentration Map, <br /> July 21, 2000 <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 /> If you have any questions, please contact me at (916) 4440123 <br /> Sincerely, <br /> BROWN AND CALDWELL <br /> Tina M Bauer, R G #6893 <br /> Project Manager <br /> TMB)w <br /> enclosures <br /> cc Ms Margaret Lagorio, San Joaquin County Public Health Services <br /> Environmental Health Department <br /> • <br /> Use or disclosure of data continued on this sheet is sublet[to the restriction specified at the beginning of this document <br /> 03/13/01P\16000\16271\Aeporu\3rd00grdoe <br />