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lVel'ths"falINC. EXECUTIVE SUMMARY Versar, Inc. (Versar) was retained by Bank of America,N.T. & S.A. (B of A) to perform a Phase I Environmental Site Assessment (ESA) at the B of A Ripon Branch No. 0852, located at 234 West Main Street in Ripon, California(Site). The purpose of this Phase I ESA was to investigate and evaluate the environmental condition of the Site and surrounding properties to identify the presence or likely presence of any hazardous substances or petroleum products on the Site that could adversely affect property use and/or value or give rise to potential liability to a government agency or private party. Versar issued a Phase I Environmental Site Assessment report on April 24, 1997. During the Phase I ESA, Versar identified former Site uses that could adversely affect the property. Versar also was retained by B of A to conduct a Phase II subsurface investigation to further assess conditions from former facilities located at the Site reported in the Phase I ESA. The Phase II investigation was conducted in May 1997 and found low concentrations of diesel- range petroleum hydrocarbons (TPH-D) in groundwater near the west boundary of the Site. Versar was retained jointly by B of A and Bank of Stockton to conduct a supplementary Phase II investigation (Phase IIb) to assess Site soil and shallow groundwater conditions with respect to the potential presence of solvents. Historic information reviewed as part of the Phase I and Phase II investigations indicated that auto repair operations were conducted at the Site in the 1940s. However, this historic information could not conclusively rule out the possibility that solvents may have been used as part of these auto repair operations. B of A and Bank of Stockton requested that the Phase IIb investigation specifically address this possibility. Site and near-site soil and groundwater were sampled on August 6, 1997, at six locations during the Phase IIb investigation, and analyzed for volatile organic compounds (VOC) by Environmental Protection Agency (EPA) Method 8240 (soil samples) and EPA Method 624 (water samples). The following summarizes the findings of Versar's Phase IIb investigation at the Site: • Volatile organic compounds were not detected in any of the soil samples. • Trace concentrations of ethylbenzene and xylene were detected at one off-site location west of the Site. These compounds are normally associated with petroleum hydrocarbons. No other VOCs were detected in groundwater samples. -98/3622-50 1/Sep04'97 ES-I