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V Geosynte& consultants • One equipment blank will be ''collected during each' day of groundwater sampling. The equipment blanks .will'be collected by'pouring organic-free, deionized water provided by Curtis & Tompkins over the stainless steel bailer following decontamination; and - • Trip blanks consisting of organic-free, deionized water will be prepared by the laboratory and will accompany, the sample containers during transport prior to, during,and after sampling. The trip blank sample bottles will not be opened. All QA/QC samples will be analyzed for toluene .by EPA Method 8260B (groundwater and soil) or TO-15 (soil gas). 7.5 Site Restoration and Investigation=Derived Waste(IDW) r Following CPT, groundwater.sampling, and.soil/soil gas sampling,, borings will be grouted using the tremmie method from the bottom up. All grouting will be conducted under the supervision of the County.. Ground surfaces will be completed to match surrounding surfaces (e.g., dirt,asphalt, or concrete). Soil cuttings, decontamination water;'and purge water generated during investigation activities will be labeled and stored at the 'Site in Department of Transportation- approved containers, pending characterization and disposal' at an appropriate off-Site facility. 41... , 7.6 Data Evaluation and Reporting + . � IF Geosyntec will- evaluate the analytical results and review the• QA/QC`. data for completeness, accuracy, precision, sample contamination, conformance with holding times, and appropriateness of detection limits., Following the data review, Geosyntec will compare Site data to LTCP criteria in a report to the RWQCB.. Recommendations for case closure or remedial action will be provided based on the comparison of Site data to LTCP criteria. i CPT-13 Area Investigation Report and Work Plan 24 30 May 2013