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DISCUSSION: <br /> TPHg was detected in one of four wells sampled this quarter at a concentration of 576 ppb(ATR-8) Benzene was <br /> reported in one well this quarter at a concentration of 4 82 ppb (ATR-8) MtBE was reported in three wells at <br /> concentrations ranging from 8 42 ppb in well ATR-4 to 572 ppb in well ATR-7 Hydrocarbon concentrations are <br /> generally consistent with historical data Wells ATR-5 and ATR-12 were inaccessible and could not be gauged and <br /> sampled Groundwater elevations across the site decreased by an average of 0 61 feet this quarter Consistent with <br /> historical data, the groundwater flow was to the northeast Attachment A contains SVE/AS system operational <br /> 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 1- 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 /> cc Mr Marty Hartzell, California Regional Water Quality Control Board-CVR <br /> Mr Harlin Knoll, San Joaquin Public Health Services <br />