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Remedial Investigation QAPP Stockton Army Aviation Support Facility,California supplied de-ionized water. Paper towels containing recycled paper content are prohibited. Decontamination activities will be performed in accordance with Parsons SOP PFAS ENV-11:Field Decontamination (Appendix D). 14.2A8 Site Survey and Geographic Position Measurement The subcontracted land surveyor will be licensed in the state of California. Survey standards for any well and sample locations shall meet the following accuracy at a minimum: horizontal accuracy of grid intersections and planimetric features at(±)0.1 feet; horizontal accuracy for boundary surveys 1 in 10,000 feet;vertical accuracy for ground surface elevations at(±)0.1 feet; and elevations of benchmarks, permanent features and wellheads at(±)0.01 feet.All data will be provided in the Universal Transverse Mercator projection in zone 10 and will have a datum of World Geodetic System 1984(WGS84). Newly installed permanent monitoring wells and staff gauges will be surveyed by a state- registered surveyor to a horizontal accuracy of 0.1 feet and a vertical accuracy of 0.01 feet. A small notch will be cut on the northern side of the well casing, which will be surveyed. The top of casing and ground surface elevation, and horizontal location will be surveyed for each newly installed well. Sample locations which are not permanent monitoring wells (i.e., hand auger soil locations, surface water locations, and sediment/stormwater-transported solids locations) will be documented using a hand-held GPS device(level of precision of(±)3 to 5 meters). 14.2.19 Investigation-Derived Waste Management Currently, the disposal of PFAS IDW is not regulated federally. Transportation is now federally regulated for reportable quantities(RQs). Under 40 CFR Part 302 the designation of PFOA and PFOS as hazardous substances under CERCLA has created an obligation for the DOT to report CERCLA designated hazardous substances as Hazardous Material Transportation Act(HMTA) hazardous materials. The reportable quantity is listed as 1 pound for these substances,which will require reporting of these compounds on manifests for DOT if the total quantity of PFOA or PFOS exceed the RQ.PFAS IDW is considered a non-hazardous waste and will be managed in accordance with USEPA, Management of Investigation Derived Waste (USEPA, 2014) and applicable state regulations. Any containerized waste will also be managed in accordance with the Army Guidance for Addressing Releases of PFAS, Q18 (DA, 2018), the memorandum Interim Guidance on Destruction or Disposal of Materials Containing Per- and Polyfluoroalkyl Substances in the United States (Assistant Secretary of Defense, 2023a), the Memorandum for Incineration Prohibition Policy Update(Assistant Secretary of Defense,2023b),and the Interim Guidance on the Destruction and Disposal of Perfluoroalkyl and Polyfluoroalkyl Substances and Materials Containing Perfluoroalkyl and Polyfluoroalkyl Substances -Version 2 (USEPA, 2024) Soil IDW(i.e.,soil cuttings)generated during RI activities will be containerized, properly labeled, and temporarily stored onsite at a location designated by the CAARNG; Parsons will coordinate these activities. In accordance with the Interim PFAS Disposal Decision Tree(Assistant Secretary of Defense, 2023a), PFAS-containing soils will be sent to a permitted hazardous waste landfill or solid waste landfill with DoD-identified controls. Liquid IDW(i.e., purge water,development water,and decontamination fluids)generated during RI activities will be handled accordingto the Interim PFAS Disposal Decision Tree(Assistant Secretary of Defense,2023a). Liquid IDW under 300 gallons will be solidified and disposed of in a permitted hazardous waste landfill or solid waste landfill with DoD-identified controls. Liquid IDW over 300 gallons will be: 1) treated if there is an economical technology available to separate or destroythe PFAS from the liquid to reduce the quantity that requires disposal, or 2) handled in the manner of liquid IDW under 300 gallons. PARSONS Worksheet#14&16: Project Tasks and Schedule Page 72