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FILE COPY ENVIRONMENTAL HEALTH DEPARTMENT SAN JOAQUIN COUNTY �• _-_�•':� Unit Supervisors Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. Director 304 East Weber Avenue, Third Floor Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins, S.,R.D.I. �:• Douglas W.Wilson, R.E.H.S. • Cq, P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. ��FORS Laurie A.Cotulla,R.E.H.S. Fax: (209) 464-0138 Robert McClellon,R.E.H.S. Program Manager Mark Barcellos,R.E.H.S. TOM BRENKW=Tz JUL 0 3 2002 EDEN GARDEN 3711A WEST KENNER ROAD TRACY CA 95376 RE: 541 W. Grant Line Road Tracy, CA In August 2000, the San Joaquin County Environmental Health Department (EHD) received a "Preliminary Phase II Site Assessment Work Plan" prepared by Advanced GeoEnvironmental, Inc. (AGE) for procurement of a soil boring permit for the above referenced site. The work1proposed was to determine whether soil and/or groundwater had been impacted by petroleum hydrocarbons from surrounding sites. The EHD issued a permit for the work and the work was performed on August 30, 2000. On September 29, 2000, the EHD received a facsimile copy of the report prepared by AGE (dated September 20, 2000) of the work that included soil and groundwater sample analytical results. The report information shows that both soil and groundwater at the site have petroleum hydrocarbon contamination. The highest concentrations of contamination were found in soil and groundwater samples collected from boring B4 that is in the central western portion of the site. The consultant recommended that the responsible party (Chevron) at 575 West Grant Line Road, Tracy, be advised of the findings in the report. The EHD is the lead agency overseeing the investigation of the Chevron and has required them to investigate the extent of the contamination at their site. To date, the information gathered by Chevron indicates that their site is not the source of the contamination at 541 West Grant Line Road. The information in the September 20, 2000, AGE report shows that the analytical results from the soil and groundwater collected from boring B3 had lower concentrations of contamination than those from B4. Since B3 is closer to the Chevron station, this would indicate that the source of the contamination is likely from past land uses in the area of B4, not contamination migrating from Chevron. Since the source of the contamination is not known and has not been shown to be from an underground storage tank system unauthorized release, the EHD would not be the regulatory agency that would provide oversight for the investigation or remediation of this site.