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Geospte& consultants cuttings will be sampled and profiled, and the material will be transported off-site for disposal at an appropriate disposal facility. A composite soil sample will be collected of the investigation derived waste (IDW) soil cuttings and sent to Eurofins Environment Testing Calscience Inc., of Tustin California(Eurofins), a California state certified laboratory for analysis of the following: • Metals by United States Environmental Protection Agency(USEPA) Method 6020 • TPH as gasoline and diesel by USEPA Method 8260B and 801513, respectively • VOCs by USEPA Method 8260B In addition to the analytes listed above, if well destruction within Site 3 occurs, a composite soil sample will be collected from the cuttings and will be analyzed for the following: • PFAS by USEPA Method 537 • Dioxins and furans by USEPA Method 8290 The disposal facilities that will accept the soil cuttings will be dependent on the analytical results of the soil sample collected for waste profiling during fieldwork. It is anticipated that if the soil is characterized as non-hazardous, it will be accepted and disposed of at Forward Landfill in Manteca, California(a permitted Class II and III landfill), and if the soil profiles as hazardous, it will be accepted and disposed of at the Kettleman Hills Facility in Kettleman City, California(a permitted Class I and III landfill). 2.5 Well Protection Activities Geosyntee plans to take the following measures to protect the newly repaired wells and other wells at RRI in good condition: • Monitoring wells at Site 3 are currently protected by railroad ties and signage that have been placed on the perimeter of the area as documented in the Draft 2020 Site Control Plan (Geosyntec, 2020). These railroad ties will be maintained to restrict vehicle access to the area to protect the wells. • Monitoring wells at Site 4 will be marked on the paved ground surface with paint to make them more visible, and signage will be added to the fence or side of the building indicating the presence of monitoring wells. The Port will also notify the building tenants of the presence of the monitoring wells and require the wells are not damaged by activities tenants conduct at the site. • Monitoring wells in the Central Areas (Site 49 &UST 81713) will be marked with paint in paved areas and marked with t-posts in vegetated areas to make the wells more visible. No well maintenance activities in the Landfill Area will be conducted in 2024 due to construction activities. The monitoring wells in the Landfill Area will be located and further assessed after construction activities are completed. Previous well maintenance activities were conducted in the Landfill Area between 2018 and 2020. RRI 2024 Groundwater Monitoring Work Plan 11 June 13,2024