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DISCUSSION: <br /> TPHg was detected in two of ten wells sampled this quarter at concentrations of 2,350 ppb (ATR-3) and 2,720 <br /> (ATR-8) Benzene was reported in one well this quarter at a concentration of 56 3 ppb (ATR-8) MtBE was <br /> reported in four wells at concentrations ranging from 8 93 ppb in well ATR-11 to 464 ppb in well ATR-3 <br /> Hydrocarbon concentrations are generally consistent with historical data,except for a slight increase in MtBE in <br /> well ATR-11 Wells ATR-9 and ATR-12 were inaccessible and could not be gauged and sampled Due to the <br /> alterations in well casing elevations measurements(ATR-3,ATR-4, and ATR-5) could not be used Well heads <br /> will be repaired and resurveyed for the next quarterly monitoring report Based on current available data, <br /> groundwater elevations across the site decreased by an average of 0 5 feet this quarter The groundwater flow was <br /> to the north and northeast with a gradient ranging from 0 004 ft/ft to 0 005 ft/ft Attachment A contains SVE/AS <br /> system operational data <br /> ATTACHMENTS: <br /> • Table 1 -Groundwater Elevation and Analytical Data <br /> • Table 2 -Historical Groundwater Oxygenate Data <br /> • Table 3 -Historical Groundwater Gradient Data <br /> • Figure i-Groundwater Elevation Contour Map <br /> • Figure 2-Groundwater Chemical Results <br /> • Attachment A-Remedial System Performance Evaluation <br /> • Attachment B -Field and Laboratory Procedures <br /> • Attachment C-Certified Analytical Reports,Cham-of-Custody Documentation, and Field Data Sheets <br /> • <br /> cc Mr Marty Hartzell,California Regional Water Quality Control Board -CVR <br /> Mr Harlin Knoll,San Joaquin Public Health Services <br /> i <br />