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DISCUSSION. <br /> • TPHg was detected in well ATR-5 this quarter at a concentration of 80 8 ppb Benzene was not reported in any of <br /> the eleven wells sampled this quarter MtBE was reported in five of the eleven wells sampled at concentrations <br /> ranging from 18 0 ppb(ATR-5) to 526 ppb(ATR-3) Hydrocarbon concentrations in groundwater were generally <br /> consistent with historical data,with the exception of wells MW-3 and MW-8, in which TPHg was reported this <br /> quarter Groundwater elevations across the site decreased by an average of 0 12 feet this quarter The groundwater <br /> flow was to the north at a gradient of 0 004 ft/ft, generally consistant with historical data Attachment A contains <br /> SVE/AS system operational data <br /> This report presents our understanding of existing conditions at the subject site The conclusions contained herein <br /> are based on the analytical results and professional judgment, which are in accordance with current standards of <br /> professional practice,no other warranty is expressed or implied SECOR assumes no responsibility for <br /> exploratory borings or data reported by other consultants or contractors <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 Laboratory Analytical Reports,Chain-of-Custody Documentation,and Field <br /> Data Sheets <br /> cc Mr Marty Hartzell,California Regional Water Quality Control Board-CVR <br /> Mr Harlin Knoll,San Joaquin Public Health Services <br />