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DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline(TPHg) were reported in four of the eight wells sampled this quarter at <br /> . concentrations ranging from 101 ppb(BDH-1)to 4,500 ppb(E-10) Benzene was reported in three of the eight <br /> wells at concentrations ranging from 0 788 ppb(BDH-1)to 87 9 ppb(E-10) Methyl tent-butyl ether(MtBE)was <br /> reported in three of the eight wells at concentrations ranging from 8 92 ppb(E-9) to 2,750 ppb(E-10) <br /> Groundwater elevations across the site decreased by an average of 8 04 ft Groundwater flow was toward the <br /> northeast to northwest at a gradient of 0 001 to 0 005 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 i -Groundwater Elevation and Analytical Data <br /> • Table 2-Historical Groundwater Oxygenate Analytical Data <br /> • Table 3 -Historical Groundwater Gradient 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 Bob Cochran,Chevron Products Company <br /> Ms Lon Duncan,San Joaquin County Health Department <br /> Mr Marty Hartzell,California Regional Water Quality Control Board-CVR <br />