Laserfiche WebLink
DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline(TPHg) were reported in six of the nineteen wells sampled this quarter at <br /> • concentrations ranging from 99 ppb(E-6)to 8,800 ppb(E-10) Benzene was reported in six of the nineteen wells <br /> at concentrations ranging from 0 66 ppb (E-6) to 810 ppb(E-10) Methyl tert-butyl ether(MtBE) was reported in <br /> seven of the nineteen wells at concentrations ranging from 3 8 ppb(E-6)to 13,000 ppb (E-10) Chemical <br /> concentrations are generally consistent with historical data Groundwater elevations across the site decreased by an <br /> average of 2 73 ft Groundwater flow was to the north-northeast at an approximate gradient of 0 002-0 004 ft/ft, <br /> which is generally consistent with historical data Attachment A contains SVE/AS system operational data <br /> Groundwater monitoring and sampling was coordinated with Chevron service station#9-4275, located north across <br /> Benjamin Holt Dr Attachment D contains Chevron groundwater elevation and analytical 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 /> s <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-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,Chain-of-custody Documentation, and Field <br /> Data Sheets <br /> • Attachment D-Chevron Groundwater Elevation and Analytical Data <br /> cc Mr Bob Cochran,Chevron Products Company <br /> Ms Lori Duncan, SJCPHS <br /> Mr Marty Hartzell,California Regional Water Quality Control Board-Central Valley Region <br /> (RWQCB-CVR) <br /> • <br />