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Geosyntec'� consultants 3.2.6 Investigation-Derived Waste Upon completion of soil sample collection at a station, excess soil collected and not needed for analysis and decontamination water will be considered investigation-derived waste (IDW). IDW will be collected in 55-gallon drums, which will be held in a secure area and appropriately labeled. Composite samples of soil will be collected and chemically analyzed to obtain representative data for soil disposal profiling. Soil cuttings will be at a minimum analyzed for: • Benzene, toluene, ethylbenzene, xylene, and MTBE by USEPA Method 8260B/C; • TPH Full Scan by USEPA 8015M; • Title 22 Metals (CAM 17) by USEPA Method 601013; and • Mercury by USEPA Method 7471A. Soil analytical profile will be used to characterize the decontamination water. The IDW, once characterized, will be removed from the site by American Integrated Services,Inc, from Fairfield, California, a California-certified waste hauler,and disposed of at an appropriate facility in accordance with state and federal regulations. All disposable sampling materials and PPE used in sample collection and processing(e.g., disposable gloves and paper towels) will be placed in heavy-duty garbage bags for disposal as solid waste. 3.3 Quality Assurance Procedures The purpose of this project section is to provide confidence in the analytical results through a system of QA/QC performance checks with respect to sample collection methods, laboratory analyses, data reporting, and corrective action procedures to achieve compliance with established performance and data quality criteria. This section presents the QA/QC procedures to ensure that the data derived from this investigation meet program QA parameters and are defensible and usable for their intended purpose. 3.3.1 Field Quality Assurance Field QA for this program includes the collection of: 20190122- FINAL UST Data Gap Work Plan 11 22.01.2019