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Geosyntec <br /> consultants <br /> of-custody procedures to Curtis & Tompkins Laboratories, of Berkeley, California. <br /> Each groundwater sample will be analyzed for toluene by EPA Method 8260B. <br /> 7.3 Task 2: Collect Samples of Soil and Soil Gas from Approximately 5 ft bgs in <br /> the CPT-13 Area) <br /> Task 2 consists of soil and soil gas sampling at the locations shown on Figure 7. The <br /> field methods and procedures for this task will be the same as those described in the Site <br /> Investigation Report(Geosyntec, 2011). Task.2 is described below. <br /> 7.3.1 Soil Sampling <br /> Soil samples will be collected from 5 ft bgs prior toinstallation of temporary soil gas <br /> wells that are described below. The samples will be collected in triplicate Encore <br /> samplers and analyzed for VOCs (EPA Method 8260) by Curtis & Tompkins <br /> Laboratory. <br /> 7.3.2 Soil Gas Sampling <br /> Temporary soil gas probes will be installed using the procedures described in the <br /> Advisory — Active Soil Gas Investigations (DTSC, 2012). All soil gas probes will be <br /> installed at a depth of 5 ft bgs via Geoprobe® direct push methods. The soil gas probes <br /> will be constructed with a filter pack and bentonite grout and completed with a closed <br /> ball valve and monitoring well box. Construction diagrams for the soil gas probes are <br /> provided as Figure 8. Soil gas samples will be collected through dedicated Nylaflow <br /> tubing attached to each probe with airtight fittings and analyzed for fixed gases <br /> (including oxygen) and volatile organic compounds (VOCs) (EPA Method TO-15). <br /> Temporary soil gas probes will be destroyed by removing the probe_ hardware and <br /> sample tubing via hand auger, filling with grout, and finishing the surface to match.the <br /> surrounding surface. <br /> 7.4 Quality Assurance/Quality Control <br /> During this investigation the following quality assurance/quality control (QA/QC) <br /> samples will be collected: <br /> • Duplicate groundwater samples will be collected at a rate of 10% and submitted <br /> blindly to the analytical laboratory; <br /> CPTH 3 Area Investigation Report and Work Plan 23 30 May 2013 <br />