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Additional Soil and Groundwa'ter Investigation Work Plan CCT Stockton Rail Yard,1645 Cherokee Lane, Stockton,CA October 4, 2007 Page 6 The borings will be advanced at the four locations of the proposed borings are shown on Figure 5. The proposed locations may be adjusted based on the location of buried utilities and overhead power lines. During the advancement of the borings soil samples will be collected continuously to the total depth of each boring. Samples will be collected for soil description in accordance with the Unified Soil Classification System (ASTM D-2487), and field hydrocarbon vapor testing will be carried out using a hand-held photo-ionization detector(PID). A minimum of two soil samples will be collected from each boring and submitted to a laboratory for analysis. Each boring will be completed to a depth sufficient to obtain a representative grab groundwater sample. Collected soil and groundwater samples will be analyzed for TPH-g by GC/MS, TPH-d by EPA method 8015, BTEX, and fuel oxygenates, including MTBE and ethanol by Method 826oB, on a standard turnaround time.. All laboratory analyses will be performed by a state-certified laboratory. Chain of Custody protocol will be followed for all samples selected for analysis, providing a continuous record of sample possession prior to analysis. After sampling is completed, all borings will be sealed with neat cement grout. A tremie pipe will be used to place the grout from the bottom of the boring to one fbg in one pour. The boring will then be completed to grade with asphalt or concrete, dyed to match the surrounding area. 5.3 Waste Disposal Soil cuttings and water generated during site assessment activities will be temporarily stored onsite in Department of Transportation(DOT)-approved 55-gallon drums pending disposal to an approved disposal/recycling facility. Waste manifests will be prepared for proper transport and disposal of the waste. 5.4 Site Assessment Report Upon completion of the site assessment activities,a final report will be prepared which will include boring logs,laboratory analytical results,findings,and conclusions. TRC will evaluate the analytical results from the grab groundwater samples collected during this investigation to determine the need for any additional groundwater assessment or the installation/re-installation of site monitoring wells. The report will be submitted to the SJCEHD. 6.o WORK SCHEDULE Planned activities will be performed according to the following estimated completion schedule: • Agency approval of work plan. • Conduct soil and groundwater investigation within six weeks of receipt of the agency approval. • Advance borings within eight weeks of obtaining analytical results from the soil and groundwater investigation. • Submit technical report within six weeks of obtaining soil and groundwater analytical results from the laboratory.