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0 4. INVESTIGATION IMPLEMENTATION 4.1 Pre-Field Activities Prior to the start of field activities, the following will be performed: • Drilling permits will be obtained from San Joaquin County Environmental Health Department; • Access agreements will be established with the off-Site property owners as necessary to complete the data gap investigation. All property owners, including Simplot, will be notified of the proposed scope of work, work hours, and schedule in advance of field implementation. • A site-specific health and safety plan (HASP) will be prepared. The HASP will be available on-Site during all field activities. Prior to the start of field activities and at the beginning of each work day, a safety tailgate meeting will be conducted; • All contractors working on Simplot property will successfully complete Simplot's Contractor Health and Safety Training. • The boring locations will be marked with white paint or stakes and underground service alert (USA) will be contacted a minimum of 48 hours prior to commencement of drilling activities; and • A private utility locator will perform physical surveys to clear potential subsurface utilities, pipelines, or other obstructions at the proposed boring locations prior to drilling work. 4.2 Investigation Activities 4.2.1 Drilling and Geologic Logging The borings will be drilled by a C57-licensed drilling contractor using a sonic drilling rig. The continuous geologic core from the sonic drilling will be logged by a field geologist under the direction of a California Professional Geologist using the Unified Soil Classification System (USCS). All downhole equipment will be decontaminated prior to use. The borings will be advanced until the top of the Corcoran Clay is encountered. The Corcoran Clay is expected to be encountered at depths between 210 and 300 ft bgs. Once the Corcoran Clay has been encountered at the boring location the drilling will be stopped. To better understand the characteristics of the soil from the borings for use in evaluation of remedial alternatives and potential future remedy extraction or injection well designs, two to six soil samples will be collect from boring Locations 2 and 3 and submitted to a laboratory for sieve analysis. The number and depths of the samples will be based on the geologic log. Soil core boxes for all the borings will be prepared and kept on-Site for future use in remedial design, as needed. Site Characterization Work Plan 6 June 22,2018