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Geospte& <br /> consultants <br /> reporting limits for these analyses will be below ESLs listed in Table 1. This will be confirmed <br /> with the analytical laboratory prior to sample analysis. <br /> The laboratory will be responsible for the following tasks: <br /> • Analyze the samples following USEPA methods and laboratory standard operating <br /> procedures. <br /> • Follow documentation and custody procedures. <br /> • Meet all reporting limit requirements. <br /> • Meet laboratory performance criteria and quality assurance/quality control (QA/QC) <br /> frequency requirements described in Section 3.3. <br /> • Deliver electronic data files as specified in this Final Work Plan Addendum. <br /> 3.2.3 Equipment Decontamination Procedures <br /> All down-hole drilling, augering, and/or sampling equipment will be decontaminated after arrival <br /> on-site and after use in each boring. The equipment will be thoroughly cleaned before it is <br /> removed from the Site at the end of field sampling. <br /> The following general decontamination procedures will be followed for all field equipment: <br /> • Perform a pre-wash rinse with tap water. <br /> • Wash with a solution of tap or site water and phosphate-free soap (e.g., Alconox®). <br /> • Rinse three times with distilled water. <br /> • Store in a clean closed container for next use. <br /> 3.2.4 Investigation-Derived Waste <br /> Upon completion of soil and groundwater sample collection at a location, excess soil collected <br /> and not needed for analysis and excess groundwater and decontamination water will be <br /> considered investigation-derived waste (IDW). IDW will be collected in 55-gallon drums, which <br /> will be held in a secure area and appropriately labeled. Composite samples of soil and composite <br /> samples of water will be collected and chemically analyzed to obtain representative data for <br /> disposal profiling. Soil cuttings and water IDW(including equipment rinse water and <br /> groundwater, if encountered)will be at a minimum analyzed for the following constituents: <br /> • VOCs and TPH-g by USEPA Method 8260B. <br /> • TPH Full Scan by USEPA 8015M. <br /> • Title 22 Metals (CAM 17) by USEPA Method 6010B. <br /> • Mercury by USEPA Method 7471A. <br /> Final Investigation Work Plan Addendum—UST 817B 8 June 24,2022 <br />