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W-4 14� SECOR ✓v: c c !„ W'FFRNA1!0NAi_ 3017 Kilgore Road,Suite 100 S E C R J X CC)ll PO IL",i :3 Rancho Cordova,CA 95670 st6-861-0400 TEL 40 916-861-0430 FAx January 10, 2003 Margaret Lagorio .J A N 1 3 Z003 San Joaquin County !=NV;RuINMENT HEALTH Environmental Health Division PERMIT/SERVICES 304 East Weber Avenue, Third Floor Stockton, CA 95202 RE: Chevron Groundwater Monitoring Report (402002) Former Chevron Station 9-0557 139 S. Center Street Stockton, California SECOR Project No.: 77CH.00000.00.0002 Dear Ms. Lagorio: SECOR International Incorporated is providing this report to summarize the recently completed groundwater monitoring event at the above-referenced site. The site is located at 139 S. f Center Street, Stockton, California. 1 ACTIVITIES COMPLETED FOURTH QUARTER 2002 Gettler-Ryan Inc. conducted quarterly groundwater monitoring and sampling and prepared the enclosed quarterly groundwater monitoring report. SECOR curtailed the ozone sparging pilot test at the site in preparation for station demolition activities. A workplan for the abandonment of all onsite monitoring and ozone sparging wells was submitted to and approved by San Joaquin County Environmental Health Division. PROPOSED ACTIVITIES FOR FIRST QUARTER 2003 Gettler-Ryan Inc. will conduct quarterly groundwater monitoring and sampling and prepare a quarterly groundwater monitoring report. Nine monitoring wells and four ozone sparging well pairs will be properly destroyed. The station will be demolished, including removal of all USTs, product piping, and dispenser islands. DISCUSSION Groundwater monitoring and sampling was performed by Gettler-Ryan Inc. on October 18`h, 2002. Fifteen wells were sampled during this event. TPHd was detected in the samples collected from eleven of the fifteen wells at concentrations ranging from 57 µg/I in the sample collected from MW-5 to 50,000 µg/I in the sample collected from MW-9S. TPHmo was detected in samples collected from three of the fifteen wells at concentrations ranging from 2,900 µg/l in the sample collected from MW- 9A to 14,000 µg/l in the sample collected from MW-9S. TPHg was detected in samples collected from four of the fifteen wells at concentrations ranging from 1,900 µg/1 in the sample collected from \ MW-7 to 240,000 µg/I in the sample collected from MW-9S.' Benzene was detected in samples collected from four of the fifteen wells at concentrations ranging from 28 �tg/I in the sample collected from MW-7 to 16,000 µg/l in the sample collected from MW-9A. MtBE was not detected in any of the samples collected during this event. 1,2-DCA was detected in the samples collected from MW-4 and i Il Chevron1905571Periodic MonitoringT000402002 QMR.doc SECOR Intemational Incorporated