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Geosyntec <br /> consWtants <br /> 4.6.3 Groundwater Samples <br /> Groundwater samples from monitoring wells MW-5B and MW-7B will be collected for analysis <br /> of the following: <br /> • 1,2,3-TCP by United States Environmental Protection Agency (USEPA) Method 8260 <br /> in selected ion monitoring mode; <br /> • 1,2-DCP and chloroform by USEPA Method 8260B; and <br /> • DBCP by USEPA Method 504.1. <br /> The following quality assurance/quality control samples will be collected: <br /> • A duplicate groundwater sample will be collected and analyzed for 1,2-DCP, 1,2,3- <br /> TCP, DBCP and chloroform by the respective USEPA Methods referenced above; and <br /> • Two laboratory-provided trip blanks pre-filled by the laboratory with deionized water <br /> that will accompany the sample containers during transport, prior to, during, and after <br /> sampling, will be analyzed for VOCs by USEPA Method 8260B. <br /> 4.7 Investigation-Derived Waste <br /> Soil cuttings and any other investigation-derived waste (IDW) will be temporarily stored in 55- <br /> gallon drums at the Site. The IDW will be profiled and disposed of at an appropriate off-Site <br /> facility. <br /> Work Plan for Vapor Intrusion Investigation 10 July 30,2021 <br />