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Workplan for Additional Assessment and Sensitive Receptor Survey Tracy Office Plaza 324 E. 11th Street,Tracy,CA January 27,2017 Task 1 -Pre-Field Activities Prior to initiating field activities,Pangea will conduct the following tasks: • Obtain drilling permits from SJCEHD as necessary; • Pre-mark the boring locations with white paint, notify Underground Service Alert (USA) of the drilling and sampling activities at least 72 hours before work begins,and conduct private line locating as merited; • Prepare a site-specific health and safety plan to educate personnel and minimize their exposure to potential hazards related to site activities;and • Coordinate with drilling and laboratory subcontractors and other involved parties. Task 2—Soil Borings To evaluate potential waste oil tank impact,Pangea proposes to advance soil boring B-11 near soil boring B-1, as shown on Figure 1.To evaluate for a potential second source area,Pangea proposes drilling boring-1 n the planter on the east side of the building(due east from boring B-1).If soil samples from boring B-12 yield field indications of contamination, a contingent step-out boring(B-13) will be drilled near boring B-3. At borings B-11, B-12,and B-13,soil samples will be collected from 5 ft bgs and 10 ft bgs. Pangea will conduct site investigation using a direct-push sampling rig.The direct-push sampling rig will be equipped with a hydraulic hammer and steel drive rods to advance the borings to total depth.With hydraulic- push drilling, continuous soil collection is conducted using acetate liners. Soil samples will be obtained by cutting 6-inch subsections,trimming the excess soil from the ends,and capping the ends with Teflon®tape and plastic caps.Additional soil samples may be collected near the water table and at lithologic changes.The soil samples will be classified according to the Unified Soil Classification System(USCS)and screened for field indications of petroleum hydrocarbons using visual and olfactory observations and a photo-ionization device (PID). All site investigation activities will be performed under the supervision of a California Registered Civil Professional Engineer (P.E.). Additional soil and assessment procedures are presented in our Standard Operating Procedures(SOPS)in Appendix B. 3