SITE INFORMATION AND CORRESPONDENCE

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San Joaquin County Environmental Health Department DIRECTOR Donna Heran, REHS 1868 East Hazelton Avenue Stockton, California 95205-6232 PROGRAM COORDINATORS � � r_ �� Robert McClellon,REHS Jeff Carruesco, REHS, RDI • c;._,_� _,.P • Kasey Foley, REHS gcIFoR`�� Website: : (209)468-3 20 Linda Turkatte,REHS Phone: (209) 468-3420 Fax: (209) 464-0138 November 14, 2012 Mr. Cyrus Youssefi Mr. Joe Mulligan 601 Main Street Investors PTP Supervising Real Property Agent 1006 Fourth Street, Suite 701 City of Stockton — Economic Development Dept. Sacramento, California 95814 425 North EI Dorado Street Stockton, California 95202 Subject: Main Street InvestorstVillas de Amistad 601 East Main Street Stockton, California 95202 By letter dated 15 April 2011, the San Joaquin County Environmental Health Department (EHD) notified you that additional information was needed before the EHD would consider this site for closure. The EHD noted that the former underground storage tank (UST), located beneath a sidewalk on Main Street in Stockton, was very near a residential apartment that has a basement, presenting concerns of a potential vapor intrusion problem. To evaluate health risks posed by the close proximity of the former UST to the apartment building, the EHD requested: • Descriptions of the north wall and floor of the excavation following removal of the UST, considering the apartment building is approximately 5 feet north of the former UST site; • Calibration records for the photo-ionization (PID) detector on 25 March 2009 when the PID screened soil concentrations during the advancement of soil boring B1, west of the former UST site, and "non-detect' results were reported; • Documentation of the final disposition of the contaminated soil referred to as the "hot pile"; • Sensitive receptors that may be impacted by the unauthorized release since, to date, a sensitive receptor survey has not been submitted to the EHD; and • Potential human and environmental health hazard indicated by the contaminant concentrations in soil thatexceeded the San Francisco Bay Regional Water Quality Control Board Environmental Screening Levels (ESLs). It has been over a year-and-a-half and the EHD has not received a response to any of the bulleted items listed above. Upon review of the files from the UST removal, the EHD can find no evidence that the highly contaminated soil identified as "hot pile" was removed from the site during the tank removal. This leads the EHD to conclude that the soil from the "hot pile" may have been returned to the former UST pit.