Laserfiche WebLink
(t <br /> DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline(TPHg) were detected in one of the five wells sampled this quarter at a <br /> concentration of 380 ppb(ATR-8) Benzene was reported in one of the five weIIs sampled this quarter at a <br /> concentration of 0 81 ppb(ATR-8) Methyl tert-butyl ether(MtBE) was reported in three of the five wells at <br /> concentrations ranging from 7 2 ppb(ATR-7)to 250 ppb(ATR-2) Chemical concentrations are generally <br /> consistent with historical data,with the exception of ATR-8,which contained MtBE for the first time this quarter <br /> Groundwater elevations across the site increased by an average of 0 27 ft Groundwater flow was to the northeast <br /> at an approximate gradient of 0 002 ft/ft, which is consistent with the historical northeasterly trend Attachment A <br /> 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-Fuel Oxygenates Analytical Data <br /> • Table 3-Groundwater Gradient Data <br /> I <br /> • Figure i- 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 />