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• Ms. Margaret Lagorio San Joaquin County Public Health Services Environmental Health Division May 6, 1997 Page 2 • Groundwater was encountered during the geotechnical investigation at approximately 13 feet below the ground surface(bgs). • The Phase I ESA performed by Blymyer was deemed incomplete and a Phase I update was proposed by SECOR. PHASE II SCOPE OF WORK To further evaluate whether or not previous onsite and/or nearby offsite activities have adversely impacted soil and/or groundwater quality underlying the Site,SECOR recommends collecting soil and groundwater samples for chemical analysis, as feasible. This section describes SECOR's specific recommendations, including the quantity and location of soil and groundwater samples to be collected and the types of chemical analyses to be performed. Phase I Update A Phase I update will be conducted by SECOR to complete the previous Phase I ESA performed by Blymyer. SECOR will conduct a Site inspection to review and update current Site conditions and verify access to proposed drilling locations. The Manteca Building and Fire Departments and the San Joaquin County Building Department files listed under both the current Site address and the previous two Site addressees will be reviewed. Available city directories and aerial photographs will be reviewed and past tenants of the Site will be interviewed to obtain additional information regarding historical uses of the Site. Pre-Field Activities Prior to beginning field work, SECOR has prepared a site-specific health and safety plan (H&S Plan) in accordance with applicable State and Federal regulations. The H&S Plan was based on available information and will describe specific procedures and protocols for mitigating potential hazards, both physical and chemical,which could potentially be encountered during implementation of the proposed field activities. A copy of the H&S Plan is attached. Following approval of this Work Plan and H&S Plan and the issuance of well construction permits from the San Joaquin County Environmental Health Division(SJCEHD), SECOR will proceed with preliminary field activities. SECOR will retain a private underground utility locator to clear each of the proposed boring locations for buried utilities. SECOR will also review available Site drawings depicting utility locations. It will be the responsibility of WilldnsBixby to provide SECOR with these drawings,if available. SECOR will also contact Underground Services Alert(USA)to notify them of the proposed activities. Soil Borings SECOR will advance a total of eight(8)soil borings(SB-1 through SB-8)at the approximate locations shown on the attached Site Plan (see Figure 2). In general, the boring locations were selected to evaluate soil and groundwater quality in areas of the Site previously occupied by businesses. Locations may be modified based on the Phase I update findings. The rationale for each of the proposed boring locations is provided below: H MAISERWANT AWANTECA.W