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Geospte& <br /> consultants <br /> • Iron and manganese by USEPA Method 601013; <br /> • Total organic carbon(TOC)by SM 531013; <br /> • Methane, ethane, ethene, and carbon dioxide by USEPA Method RSK-175; and <br /> • Alkalinity by SM 2320B. <br /> 4.3.1 Field Methods and Procedures <br /> All field work will be performed under the supervision of a California licensed professional <br /> geologist or engineer in accordance with the SOP for low-flow sampling provided in Appendix B <br /> and the Health and Safety Plan(HASP)provided in Appendix C. Confluence Environmental of <br /> Rio Linda, California(Confluence)will perform groundwater sample collection under the <br /> direction of Geosyntec using bladder pumps. The groundwater samples will be collected at a <br /> mid-screen depth in each well. <br /> Within each area, groundwater sampling will be conducted starting with the wells that have had <br /> the lowest VOC concentrations, with progressive sampling of the wells with higher VOC <br /> concentrations. Prior to and after each use, reusable sampling equipment will be properly <br /> decontaminated as described in the SOP in Appendix C. Quality assurance/quality control <br /> (QA/QC) samples will be collected in accordance with the Quality Assurance Project Plan <br /> (QAPP)provided in Appendix D. <br /> 4.3.2 Laboratory Methods and Procedures <br /> The groundwater samples will be sent under standard chain-of-custody procedures to Eurofins, a <br /> California-certified laboratory, for analysis as listed in Table 3. The QAPP in Appendix D <br /> provides the reporting and method detection limits for specific analytes. <br /> 4.4 Investigation-Derived Waste Management <br /> Decontamination fluids and purged groundwater from sampling will be collected in 55-gallon <br /> drums,profiled for waste characteristics, and temporarily stored on-site. All IDW generated from <br /> the annual monitoring event will be removed off-site and disposed of by American Integrated <br /> Services of Wilmington, California(AIS). Once the IDW has been accepted for disposal by an <br /> appropriate licensed disposal facility, the Port or an authorized representative of the Port will <br /> sign the waste manifest and the IDW drums will be transported off-site by AIS to the disposal <br /> facility. The IDW is anticipated to be non-hazardous and therefore is expected to be disposed of <br /> at the Crosby and Overton facility in Long Beach, California. <br /> 5. SCHEDULE AND REPORTING <br /> Upon DTSC and CVRWQCB approval of this 2024 GMWP, the groundwater sampling <br /> contractor(Confluence) will be scheduled. If approval of this 2024 GMWP is received from <br /> DTSC and CVRWQCB by August 15, 2024, the 2024 groundwater monitoring event will take <br /> place in the third quarter 2024, as planned. If approval is not received by August 15, 2024, the <br /> 2024 groundwater monitoring event may not be able to be completed, pending precipitation, <br /> because of the inaccessibility of wells at RRI that occurs during wet site conditions. <br /> RRI 2024 Groundwater Monitoring Work Plan 14 June 13,2024 <br />