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DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline(TPHg)were detected in two of the six wells sampled this quarter,both <br /> at concentrations of 150 ppb(ATR-5 and ATR-8) Benzene was reported in one of the six wells at a concentration <br /> of 17 ppb(ATR-5) Methyl tert-butyl ether(MtBE)was reported in three of the six wells at concentrations ranging <br /> from 96 ppb(ATR-2)to 580 ppb(ATR-7) Groundwater elevations across the site decreased by an average of 0 16 <br /> ft Groundwater flow was variable to the northeast,southeast,and southwest at an approximate gradient of 0 002 - <br /> 0 006,generally consistent with historical data Attachment A contains 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 in accordance with current standards of professional <br /> practice,no other warranty is expressed or implied SECOR assumes no responsibility for exploratory borings or <br /> data reported by other consultants or contractors <br /> ATTACHMENTS: <br /> • Table 1 -Groundwater Elevation and Analytical Data <br /> • Table 2-Historical Groundwater Gradient Data <br /> • Table 3-Fuel Oxygenates Data <br /> • Figure 1-Groundwater Elevation Contour Map <br /> • Figure 2-Groundwater Concentration Map <br /> • Attachment A-Remedial System Performance Evaluation <br /> • Attachment B -Field and Laboratory Procedures <br /> • Attachment C-Certified Laboratory Analytical Reports,Cham-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 />