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PES Environmental,Inc. <br /> Ms. Emily Cushman <br /> November 24, 2015 <br /> Page 3 <br /> Field Preparation Activities <br /> The following activities will be performed prior to the commencement of field sampling <br /> activities: <br /> • Modify the site-specific Health and Safety Plan (HSP) in accordance with applicable <br /> occupational safety and health requirements; <br /> • Obtain drilling permits from the San Joaquin County Environmental Health Department <br /> (SJCEHD) and the local Reclamation District; <br /> • Contact Underground Services Alert for public utility clearance; <br /> • Retain and schedule drilling and laboratory subcontractors; and <br /> • Perform utility clearances at sampling locations. <br /> Field Investigation <br /> General Procedures <br /> As part of this investigation, soil and groundwater samples will be collected from up to <br /> 12 locations (see Plate 2). Borehole drilling and sampling services will be provided by a <br /> licensed contractor possessing a valid C-57 water well contractor's license issued by the State <br /> of California, and in accordance with California Department of Water Resource Water Well <br /> Standards (Bulletin 74-90). <br /> The soil and grab groundwater sampling will be conducted under the supervision of a <br /> California-registered geologist or engineer. A PES field geologist or engineer will observe <br /> the borehole drilling and will prepare a lithologic log of the borings using the Unified Soil <br /> Classification System. Soil samples will be field screened for VOCs using a photoionization <br /> detector (PID), and the PID readings will be recorded on the lithologic log. <br /> To reduce the potential for cross-contamination between sampling locations, downhole drilling <br /> and sampling equipment will be thoroughly cleaned prior to initiating work and between <br /> sampling locations. Sampling equipment will be washed in a dilute Alconox (or equivalent) <br /> solution, rinsed with potable water, and final rinsed with distilled water between each sampling <br /> location. Direct-push drilling equipment will be decontaminated as necessary with a <br /> high-pressure hot water wash between sampling locations. Soil cuttings and decontamination <br /> fluids will be temporarily stored on-site pending characterization and proper off-site disposal. <br /> Upon completion of sampling activities, each borehole will be grouted to the surface in <br /> accordance with SJCEHD requirements. <br /> 148400101w003.dmx <br />