SITE INFORMATION AND CORRESPONDENCE CASE 1

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**Owl I-W" San Joaquin County PIC). Environmental Health Department DIRECTOR Donna Heran, REHS 600 East Main Street Stockton, California 95202-3029 PROGRAM COORDINATORS Robert McClellon, REHS Jeff Carruesco, RENS,RDI Cq - ..•��P Website: www.sjgov.org/ehd Kasey Foley, REHS �IFOR Phone: (209) 468-3420 Fax: (209)464-0138 January 5, 20M ip Bank of Stockton Tony Palma Attn: John Urrutia Palma Properties LLC P O Box 1110 10 Rickenbacker Circle Stockton, CA 95201 Livermore, CA 94551 Subject: Former Western Lift 3430 S. EI Dorado Street (currently 3930 S. EI Dorado Street) Stockton, CA 95206 The San Joaquin County Environmental Health Division (EHD) is the lead agency providing the oversight of the investigation and cleanup of releases from underground storage tanks (USTs) within San Joaquin County. The EHD has a contract with the California State Water Resources Control Board to conduct a UST corrective action program. The above referenced site was placed in the EHD Local Oversight Program (LOP) in August 1991 after soil contamination was discovered beneath three USTs removed from the southern area of your site. The three USTs (UST-1, UST-2, and UST-3) were removed on June 6, 1991, under the EHD permit and inspection. The removed USTs had been used to contain gasoline and diesel fuel. 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 excavation and backfilling with clean material the excavated soil was hauled and was disposed at Forward Landfill. After backfilling was completed, several soil borings and monitoring wells (MWs) were completed in the area of the former USTs. Ground water samples results were low in concentration with declining trends established over time and the plume appeared to be localized to a small impacted area. The site was being considered for closure by EHD and some of the non-detect MWs were destroyed in March of 1997. Ground water was monitored from 1992 through 2009. The only contaminant reported in 2009 was MTBE from MW-1 at a concentration of 1.2 ug/L. In 1997 the EHD requested that an on-site abandoned production well be sampled and decommissioned/destroyed prior to site closure. The out of service production well was approximately 400 feet north of the former three USTs. The well was sampled and gasoline was discovered in the ground water. This well was later decommission/destroyed under EHD permit and inspection.