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r <br /> DISCUSSION: <br /> • Total petroleum hydrocarbons as gasoline(TPHg) were detected in two of the nine wells sampled this quarter at <br /> concentrations of 170 ppb(ATR-8) and 2,300 ppb(ATR-3) Benzene was reported as nondetect to all nine wells <br /> sampled this quarter Methyl tert-butyl ether(MtBE) was reported in four of the nine wells at concentrations <br /> ranging from 1 8 ppb(ATR-6)to 710 ppb(ATR-4) Tert-butyl alcohol(TBA)was reported as nondetectable <br /> above the laboratory reporting limits in all nine wells sampled this quarter Chemical concentrations were generally <br /> consistent with historical data Groundwater elevations across the site decreased by an average of 0 03 ft this <br /> quarter Groundwater flow was to the northeast at an approximate gradient of 0 002 ft/ft which is consistent with <br /> the historical northeasterly trend Attachment A contains S VE/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-Fuel Oxygenates Analytical Data <br /> • Table 3 -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 Marty Hartzell,Regional Water Quality Control Board-Central Valley Region (RWQCB-CVR) <br /> Mr Harlin Knoll, SJCPHS <br />