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Phase I Environmental Site Assessment Project#:97-0782 Proposed AutoZone Site,Stockton,California 6.1 October 13, 1997 Page 2 of 6 Anthony-Taylor Consultants does not feel that additional environmental assessment is warranted at this time nor do we feel that there is cause for further remediation of the soils impacted. However, although we do not expect the San Joaquin County Environmental Health Division to reopen the case, it is a possibility. Therefore, Anthony-Taylor Consultants recommends that a confirmation letter from the County of San Joaquin Environmental Health Division be obtained indicating that the case is to remain closed. II. INTRODUCTION Anthony-Taylor Consultants performed a Phase I - Environmental Site Assessment on the subject site in October 1997. The results of the assessment indicated that the subject site was once a distribution facility for Coca Cola Enterprises. Associated with the distribution facility were two (2) underground storage tanks - one gasoline tank and one diesel tank. When Coca Cola ceased their operations at the facility,the two underground storage tanks and associated equipment were removed from the site. At the time the tanks were removed an unauthorized release of petroleum hydrocarbons was discovered. Coca Cola Enterprises then assessed and remediated the unauthorized release to the satisfaction of both the Regional Water Quality Control Board and the County Environmental Health Department (PHS, 1996 & RWQCB, 1996). The governing agencies issued closure letters for the site with knowledge that residual concentrations of TPH and BTEX existed in the subsurface and that "Hot Spots" of TPH and BTEX may also exist (Lagoria, 1997). The 1� agencies also believed that the quantities of contaminants remaining in the subsurface would not adversely affect the groundwater beneath the site. The groundwater beneath the site was reported at depths greater than sixty feet below the ground surface. During the Phase I - Environmental Site Assessment, Anthony Taylor Consultants also performed a geotechnical evaluation of the subject site. As part of the geotechnical evaluation several borings were advanced on the site. While advancing borings near the former location of the gasoline storage tank, strong hydrocarbons odors were detected. With the detection of strong hydrocarbons near the surface on the subject site, it was decided to assess the likelihood that gross contamination existed in the shallow soils.