WORK PLANS - Laserfiche WebLink

Home Browse Search

Geosyntec consultants These sites have been grouped into the following areas: • Site 41 • Central Areae (Sites 2, 5A, 513, 5C, 51), 43, 49 and UST 81713) • Landfill Area(Site 39, IAS-3/4, IAS-07 and IAS-16) • Site 33 In 2024, the areas were categorized into OUs to facilitate the RDFS process. The OUs follow the previous area groupings, with the Central Area split into two OUs. In the Central Area, the petroleum hydrocarbon UST 817B site was kept as a separate OU from the rest of the Central Area, which contains chlorinated solvents. The groundwater OUs are as follows: • Site 4 • Site 49 Central Area • UST 817B Central Area • Landfill Area • Site 3 1.3 Previous Environmental Investigations Investigations have been completed over the last 41 years to improve the understanding of the hydrogeology, groundwater quality, and fate and transport of constituents of potential concern (COPCs) at RRI: • Eighty-nine piezometers and 370 wells were installed and gauged. • Approximately 370 grab-groundwater samples have been collected. • Thirteen stream gauges were installed and monitored by the Navy prior to the property transfer. • Approximately 350 wells have been sampled for volatile organic compounds (VOCs). • Groundwater samples have been collected at RRI for analysis of VOCs,total petroleum hydrocarbons (TPH), semi-volatile organic compounds (SVOCs), metals, pesticides, dioxins and furans, herbicides, polychlorinated biphenyl (PCB) aroclors, polycyclic aromatic hydrocarbons (PAHs), radionuclides, per-and polyfluoroalkyl substances (PFAS),pharmaceuticals and personal care products including DEET and bisphenol a, general chemistry parameters, and biogeochemical indicators. ' The Site 4 Area has also been referred to as the Warehouse Area. 2 The Central Area has also been referred to as the Administrative Area or the Site 49 Area. 3 The Site 3 Area has also been referred to as the Agriculture Area. RRI 2025 Groundwater Monitoring Work Plan 3 May 2025