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Geospte& <br /> consultants <br /> • Landfill Area(Site 39, IAS-3/4, IAS-07 and IAS-16) <br /> • Site 33 <br /> 1.3 Proposed Groundwater Operable Units <br /> The proposed groundwater operable units for RRI follow the previous area groupings with the <br /> Central Area split into two operable units. In the Central Area the petroleum hydrocarbon UST <br /> 817B site is proposed to be kept as a separate operable unit from the rest of the Central Area <br /> which contains chlorinated solvents. The proposed groundwater operable units are as follows: <br /> • Site 4 <br /> • Site 49 Central Area <br /> • UST 817B Central Area <br /> • Landfill Area <br /> • Site 3 <br /> 1.4 Previous Environmental Investigations <br /> Investigations have been completed over the last 40 years to improve the understanding of the <br /> hydrogeology, groundwater quality, and fate and transport of constituents of potential concern <br /> (COPCs) at RRI: <br /> • 89 piezometers and 369 wells were installed and gauged. <br /> • Approximately 370 grab-groundwater samples have been collected. <br /> • 13 stream gauges were installed and monitored by the Navy prior to the property <br /> transfer. <br /> • Approximately 350 wells have been sampled for volatile organic compounds (VOCs). <br /> • Groundwater samples have been collected at RRI for analysis of VOCs, total <br /> petroleum hydrocarbons (TPH), semi-volatile organic compounds (SVOCs), metals, <br /> pesticides, dioxins and furans, herbicides,polychlorinated biphenyl (PCB) aroclors, <br /> polycyclic aromatic hydrocarbons (PAHs), radionuclides,per-and polyfluoroalkyl <br /> substances (PFAS), pharmaceuticals and personal care products including DEET and <br /> bisphenol a, general chemistry parameters and biogeochemical indicators. <br /> • Surface water samples have been collected at RRI for analysis of VOCs, TPH, metals, <br /> organochlorine pesticides (OCPs), dioxins and furans, PCBs, PAHs, radionuclides, <br /> and general chemistry parameters. <br /> • Sediment samples have been collected at RRI for analysis of VOCs, PCBs and <br /> general chemistry parameters. <br /> 3 The Site 3 Area has also been referred to as the Agriculture Area. <br /> RRI 2024 Groundwater Monitoring Work Plan 3 June 13,2024 <br />