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AlFersconINC. 1.0 INTRODUCTION On May 16, 1997, Versar, Inc. (Versar) conducted a subsurface investigation to further investigate conditions reported in the Phase I Environmental Site Assessment (ESA) conducted at the Bank of America Ripon Branch No. 0852, located at 234 West Main Street in Ripon, California(Site). The investigation included collecting soil and groundwater samples from four soil boreholes to assess whether there were releases to soil or groundwater from the former uses associated with the Site. These former uses were identified in Versar's ESA report entitled Phase I Environmental Site Assessment Bank of America -Ripon Branch No. 0852, 234 West Main Street, Ripon, California 95366, dated April 24, 1997, and during a subsequent telephone interview with a local historian. The Site location and Site layout are shown on Figures 1 and 2, respectively. 1.1 Scope of Work The scope of work consisted of conducting a telephone interview with a local historical authority to locate possible release sources from former facilities or operations at the Site; and using information gathered during the interview and from a Sanborn fire insurance map, install boreholes at appropriate locations for the collection of soil and groundwater samples. The resulting borehole locations are shown on Figure 2. A copy of the Sanborn fire insurance map is included in Appendix A. Boreholes BH-1, BH-2, BH-3, and BH-4 were drilled southwest of and downgradient from auto repair facilities formerly located at the Site, to assess if there have been releases to soil or groundwater from former Site activities. Based on a review of a USGS topographic map of the Site area, the direction of groundwater flow was inferred to be to the southwest. 1.2 Site Location and Layout The Site is located at 234 West Main Street, Ripon, San Joaquin County, California. It is located approximately '/4 mile southwest of State Highway 99. The Site is currently utilized as Bank of America's Branch No. 0852. It consists of a two-story commercial office building with paved, street-level parking, and landscaped areas on 14,418 square feet of land. 1.3 Background On April 9, 1997, Versar was retained by Bank of America to perform a Phase I ESA at the Site. The adjoining and surrounding properties were also investigated to identify any off-site environmental issues that have the potential to impact the Site. The Phase I ESA identified the presence of former auto repair facilities on the Site. 4583-97/3622-500/Jun3097 1