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lVeresualINC 1.0 INTRODUCTION Versar, Inc. (Versar) was retained by Bank of America,N.T. & S.A. (B of A) to conduct a Phase I Environmental Site Assessment (ESA) at the Bank of America Ripon Branch No. 0852, located at 234 West Main Street in Ripon, California(Site). The purpose of the 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 report entitled Phase 1 Environmental Site Assessment Bank ofAmerica-Ripon Branch No. 0852, 234 West Main Street, Ripon, California 95366, dated April 24, 1997. During the Phase I ESA, Versar identified former Site uses that could adversely affect the property. In May 1997, Versar, on behalf of B of A, conducted a Phase II subsurface investigation to further assess conditions identified by the Phase I investigation. The results of the May 13, 1997, Phase II investigation were presented in Versar's report entitled Phase II Subsurface Investigation - Ripon Branch No. 0852, 234 Main Street, Ripon, California 95366, dated June 30, 1997. Versar was retained jointly by B of A and Bank of Stockton under the terms of a July 14, 1997, letter agreement between these two banks to conduct a supplementary subsurface investigation to further investigate conditions reported in the Phase I and Phase II investigations. This supplemental investigation included collecting soil and groundwater samples from six soil boreholes and temporary well points to investigate the potential presence of volatile organic compounds (VOC) in subsurface soil and groundwater. The Site location and Site layout are shown on Figures 1 and 2, respectively. 1.1 Scope of Work The scope of work for the Phase IIb investigation was developed with input from the Bank of Stockton and B of A. The scope of work consisted of further inquiry into the direction of groundwater flow in the Site vicinity, and using information gathered during the interview and from a Sanborn fire insurance (Sanborn)map for the installation of 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 map is included in Appendix A. Boreholes BH-5 and BH-6 were drilled on Site at the south edge of the bank, near the rear of a former automobile sales and service business. Boreholes BH-7 and BH-8 were drilled north of the Site, between the Site and a former dry cleaner located across West Main Street. Boreholes BH-9 and BH-10 were drilled west of the Site, within South Locust Street, along the length of the former automobile sales and service business. -98/3622-50 1/Scp04'97 I