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tvo Phase I Update and Pre-Gas Station Phase 11 Report Proposed Safeway Store#1769 Gas Station Stockton, Califomia December 12, 2000 1.0 SUMMARY HSI GeoTrans, Inc. was retained by Safeway Inc. to perform a Phase I Environmental Assessment Update (Phase I EA Update) and pre-gas station Phase II sampling program for the Safeway store #1769 proposed gas station site (the Property) located at 2782 Country Club Boulevard in Stockton, California. HSI GeoTrans was subsequently retained by the Property owner, Jacobsen Family Holdings II, LLC, to perform the Phase II sampling work. For this project, a Phase I environmental assessment report prepared for a larger site which included the gas station site, was updated for this report. The report is titled Phase 1 Environmental Site Assessment of Commercial Property, 2780 & 2782 Country Club Boulevard, Stockton, California 95204, dated January 18, 2000, prepared by ATC Associates. The purpose of the Phase I EA Update was to compare existing site conditions regarding known or suspected releases of hazardous substances on or near the Property with those described during the original Phase I EA report. The purpose of the Phase II sampling was to provide a baseline assessment of subsurface soil and groundwater onditions prior to the installation of a Safeway gas station. HSI GeoTrans found no evidence of the presence of Recognized Environmental Conditions at the Property, with one exception; low concentrations of MTBE and xylenes detected in groundwater on the northeast comer of the Property. Fuel releases have been documented at two nearby gasoline stations (7-11 and Exxon) located north and east-northeast of the Property, respectively. The regional groundwater flow direction is reportedly west-southwest; however, the local groundwater flow direction has been calculated to the east-northeast at the Exxon station and due west and the 7- 11 station. This variable groundwater flow direction may be due in part to groundwater pumping from several nearby domestic wells combined with the relatively flat groundwater table expected in this area. Furthermore, the nearby Sacramento River may impart tidal influences on the groundwater flow direction in this area. �? The presence of MTBE and xylenes in groundwater on the Property are not believed to have originated from the Property, but rather appear likely to be from adjacent leaking underground storage tank sites, such as the 7-11 site located approximately 100 feet north from boring SBA. According to Mr. Mike Infuma of the San Joaquin County Environmental Management Department, a catastrophic gasoline release was discovered at the 7-11 site when the on-site USTs were replaced in July 1998. No chemicals were detected in groundwater on the Property in the remaining upgradient boring locations. No further site assessment activities are recommended for the Property at this time. wwRaEcrs%.We"y O4%Stoddw-1o3%1769�_Ei�_Upd8te.aa 2