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10 0 GROUND WATER MONITORING WORK PLAN DREDGE MATERIAL DISPOSAL SITE 1,ROBERTS ISLAND,PORT OF STOCKTON wells proposed herein may be provided along with recommendations regarding the four existing monitor wells at DMD1. Implementation of this work plan will commence following approval by the RWQCB and when access to DMD1 is feasible and safe by the required personnel and associated equipment. Following approval of this work plan, appropriate subcontractors will be contacted, contracted, and scheduled. All reasonable attempts will be made to schedule the field work 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 and supplemental update 74-90. The work proposed herein incorporates by reference the standard operating procedures, protocols, and forms submitted previously in the Groundwater Sampling and Analysis Plan (Geomatrix, 2003). 3.1 PHASE 1: DREDGE MATERIAL AND HYDROGEOLOGIC CHARACTERIZATION 3.1.1 Task 1: Permitting, Utility Clearance, and Health & Safety Plan As described below, drilling activities are planned at DMD1. Therefore, appropriate permits for these activities will be acquired from the San Joaquin County and the City of Stockton. Underground Services Alert (USA) will be notified to clear the proposed drilling locations for underground utilities. 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 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 through dredge materials and agricultural fields using hydraulic direct-push (e.g., geoprobe) drilling equipment. Prior to beginning drilling, the depth to water will be measured in the existing monitor wells to identify the likely depth to water within the dredge sediment materials. This task explains boring methodology, sampling locations; and sample collection, preservation, and handling procedures. January 2005 Page 8 Environmental Risk Services,Corp.