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GROUND WATER INVESTIGATION WORK PLAN BULK TERMINALS SITE, PORT OF STOCKTON, STOCKTON, CALIFORNIA Implementation of this work plan will commence following approval by the Regional Board and as soon as access to the bulk terminals site is feasible and safe for all required personnel and equipment. Following approval of this work plan, appropriate subcontractors will be contacted, contracted, and scheduled. All reasonable attempts will be made to schedule the fieldwork as soon as possible. All work will be performed under the supervision of a California Registered Geologist, or California Professional Engineer. All laboratory analyses will be performed by a California certified laboratory. All drilling and well installation will be performed in accordance with the California Department of Water Resources Well Standards Bulletin 74-81. 3.1 PHASE 1: HYDROGEOLOGIC CHARACTERIZATION 3.1.1 Task 1: Permitting, Utility Clearance, and Health & Safety Plan As described below, drilling activities are planned at the bulk terminals site. Therefore, appropriate permits for these activities will be acquired from the San Joaquin County and the City of Stockton. Underground Service Alert (USA) will be notified to clear the proposed drilling locations for underground utilities, and a private utility locator may be used to clear specific drilling locations. The proposed drilling locations are contingent upon access limitations (e.g., site features, utilities) and final locations may be moved to the closest accessible location. As required by the Occupational Health and Safety Administration (OSHA) 29 CFR 1910.120, Hazardous Waste Operations and Emergency Responses, a site-specific Health and Safety Plan (HSP) will be prepared for use while conducting the proposed field sampling activities. The HSP will be read and approved by the Project Manager, a Quality Assurance Reviewer, and the On-site Safety Officers of all subcontractors working at the Site. 3.1.2 Task 2— Boring Advancement and Sample Collection Borings will be advanced using hydraulic direct-push (e.g., geoprobe) drilling equipment. Prior to drilling, the depth to water will be measured in the four existing monitor wells to identify the likely depth to water in other areas of the site. This task also includes ground water sampling at existing monitor wells MW-1 through MW-4 (Figure 5). This task explains boring methodologies, sampling locations, and sample collection, preservation, and handling procedures. July 2005 Page 8 Environmental Risk Services Corp.