SITE INFORMATION AND CORRESPONDENCE CASE 1

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`.r San Joaquin County Environmental Health Department DIRECTOR �•' —,Ef •� Donna Heran,REHS r. ? 1868 East Hazelton Avenue a. Stockton, California 95205-6232 PROGRAM COORDINATORS Robert McClellon,REHS Jeff Carruesco,REHS,RDI Website: www.sjgov.org/ehd Kasey Foley, REHS Phone: (209)468-3420 Linda Turkatte,REHS Fax: (209)464-0138 July 19, 2012 Bank of Stockton Tony Palma Attn: Reed Rosenberg Palma Properties LLC P O Box 1110 10 Rickenbacker Circle Stockton, CA 95201 Livermore, CA 94551 Subject: Former Western Lift Site Code: 1087 3430 S. EI Dorado Street APN: 175250042 (currently 3930 S. El Dorado Street) Stockton, CA 95206 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 a UST corrective action program. The above referenced Site was placed in the EHD Local Oversight Program (LOP) in August 1991 when soil contamination was discovered beneath three USTs removed from the southern area of the Site. The three USTs (UST-1, UST-2, and UST-3) were removed on 6 June 1991 under EHD permit and inspection. Analytical results for soil samples collected from beneath the USTs documented an unauthorized release of gasoline and diesel fuel. In September 1991, the area was excavated to approximately 32 feet below ground surface (BGS) and soil confirmation samples collected from the excavation were"non-detect" for contaminants analyzed. After backfilling was completed in 1992, several soil borings and monitoring wells (MWs) were completed in the area of the former USTs. Soil and ground water sample results were initially impacted by low contaminant concentrations. In 1996, EHD requested that an on-site abandoned production well in the northern area of your Site be sampled and destroyed prior to Site closure consideration. The out of service production well was approximately 400 feet north of the three former USTs in the southern area undergoing post-remediation monitoring and sampling. The out of service production well was sampled and gasoline contaminants were present in the ground water sample collected and the out of service production well was then destroyed under EHD permit and inspection. Further research of the northern area was conducted by your consultant Phase One Environmental. Documents maintained by the San Joaquin County Assessor's Office had recorded an additional UST (UST-4) on-site. It had been installed approximately 30 feet south of the out of service production well.in the northern area of the Site. No documents of the removal of UST-4 were found by Phase One Environmental. Investigation of the area could not locate UST- 4. The exact time of the UST-4 removal is unknown, but may have occurred prior to the State of California UST regulations that came into effect in 1984. An unauthorized release from UST-4 was suspected of causing the gasoline contamination in the production well in the northern area of the Site.