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f li • • <br /> Mr Terry Tardih <br /> January 11, 2000 <br /> Page 3 <br /> Discussion. <br /> Based on this quarter's data,groundwater flows to the southwest under an approximate hydraulic <br /> gradient of 0 001 Concentrations of TPH-G and benzene increased in MW-3 and MW-4, and <br /> decreased in MW-1 and MW-2 Based on the groundwater chemical and gradient data, the extent <br /> of the petroleum hydrocarbon plume can be estimated to extend further to the south,west and <br /> east of MW-3 <br /> Attachments <br /> Figure 1 Site Location Map <br /> Figure 2 Site Map <br /> Figure 3 Groundwater Elevation Contour Map,April 27, 1999 <br /> Figure 4 Groundwater Constituent and Isoconcentration Map,April 27, 1999 <br /> Table 1 Well Construction Details <br /> Table 2 Historical Groundwater Elevation Data <br /> Table 3 Groundwater Analytical Data <br /> Table 4 Comparison of Groundwater Analytical Results with Previous Sampling <br /> Event <br /> Attachment A Field Data Sheets <br /> Attachment B Laboratory Analytical Reports <br /> If you have any questions,please contact me at (916) 444-0123 <br /> Sincerely, <br /> BROWN AND CALDWEI L <br /> Tina M Bauer,R G #6893 <br /> Protect Manager <br /> TMB tw <br /> enclosures <br /> cc Mr Ron Rowe, San Joaquin County Public Health Services Environmental Health <br /> Department <br /> U e or dixtavim of date rontmneed as th+r sheet is serbjeer to the erstrwros tptafeed at the beginning of thu daaanent <br /> 01/11/00P%16000 16271\Reports\2nd99gv doc <br />