SITE INFORMATION AND CORRESPONDENCE

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ENVIRONMENTAL HEALA DEPARTMENT SAN JOAQUIN COUNTY Unit Supervisors Donna K.Horan,R.E.H.S.: .. Director 304 East: Weber Avenue, Third Floor Carl Bergman,R.E-H,S. Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S-,R.D.I. Douglas W.Wilson,R-E.H.S. Program Manager Laurie A.Cotulla,R.E..H.S: Telephone: (209) 468-342.0 Margaret Lagorio,R.E.H.S. � Program Manager. Fax: (209) 464-0138 Robert McClellon,R,E.H.S. Mark Barcellos,'R.E.H.S. DENNIS KIM JUN Q 4 200¢ 22633 MOUNT EDAN SARATOGA CA 95070 RE: 2450 S EI Dorado Street, Stockton Site Code: 0001475 San Joaquin County Environmental Health Department(EHD) is the lead agency providing the oversight of the investigation'and cleanup of releases from underground storage tanks (USTs) within San Joaquin County. EHD has a contract with the California State Water Resources Control Board (SWRCB)to conduct an UST corrective action program. The above referenced site was placed in the EHD Local Oversight Program (LOP) in January 2003. EHD issued a permit to Advanced Geo Environmental Inc. (AGE) on May 7, 2002, for shallow soil borings to 20 feet below ground surface. The soil sampling was being performed for a Phase 11 Site Assessment. On May 21, 2002,AGE completed a Phase 11 Assessment Report for Construction, Testing & Engineering Inc. (CET) summarizing the findings for the 4 shallow borings; the soil results evidenced petroleum hydrocarbon contamination from non-UST sources. The AGE report recommended additional soil and groundwater sampling. The additional work was performed on July 24, 2002. On August 19, 2002, EHD received a Subsurface Investigation Report prepared by AGE dated August 15, 2002. The report contained the analytical results for the sampling performed by AGE on July 24, 2002. Due to the petroleum hydrocarbon contamination found in the soil and groundwater from non-UST sources, EHD referred you to the Central Valley Regional Water Quality Control Board (CVRWQCB)for site investigation and cleanup oversight. The CVRWQCB J_ responded to you in a recommendation letter dated September 4., 2002. On November 11, 2002, AGE notified EHD of two abandoned USTs found during exploratory excavation. EHD staff performed an inspection to verify the presence of the two USTs and the reported release. EHD filed"an Unauthorized .Release Report on November 12, 2002, for the petroleum released beneath.the two abandoned redwood USTs. The USTs were removed on November 27, 2002. Free phase petroleum hydrocarbon liquid was pumped from the UST excavation and soil sampleswere collected for analyses 3 feet beneath. the USTs. i Due to the petroleum hydrocarbon release into the soil from the USTs, the site was placed in the LOP on January 9, 2003 and further investigation was required: On February 20, 2003, three monitoring wells (MW)were,installed near the former UST area. On May 12, 2003, one Geoprobe (PB-20)was completed to 45 feet below ground surface in the excavation near the former USTs. Soil and groundwater samples collected and analyzed from MW-1, MW-2, and MW-3 and PB-20 are the only samples associated with UST release investigation: The other work performed during the Phase 11 Investigation is from non-UST sources and should not be submitted to the Cleanup Fund for reimbursement.