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Department of Toxic Substances Control Site Investigation Environmental investigations of Area 47 were conducted from 1995 through 2020. Contaminants detected include metals (primarily arsenic), polynuclear aromatic hydrocarbons (PAHs), and organochlorine pesticides. The contaminants in soil and sediment were determined to pose a risk to humans and wildlife and require remediation. Proposed Cleanup Alternative The draft RAP considered five remedial alternatives and compared the alternatives to nine criteria. The proposed remedy for soil and sediment is to excavate and consolidate the material under a cover. Approximately 57,000 cubic yards of material with the highest concentrations will be excavated and consolidated under the planned Warehouse and Distribution Facility (Project Sierra). The proposed remedy would be implemented along with planned Project Sierra. The remaining materials will be placed under a concrete or asphalt cover or clean soil. The remedy will be implemented in two remediation phases. Remediation Phase 1 will begin in 2023 and completed in 2025. Remediation Phase 2 will start between 2025 and 2027 and be completed within two years. California Environmental Quality Act (CEQA) The Port of Stockton is the Lead Agency for the proposed development project. The Port of Stockton held a public comment period in January 2022 through February 2022 and a virtual public meeting on February 1, 2022, on the Development Warehousing and Distribution Facility Project Environmental Impact Report (EIR) (More information can be found at https://www.portofstockton.com/cega- documents/). DTSC will depend on the EIR to comply with CEQA if the alternative chosen after the draft RAP was reviewed by the public is not materially different from that suggested in the draft RAP. The EIR will be located on EnviroStor database for review. As the Lead Agency for the corrective action and a Responsible Agency under CEQA, DTSC will file a Notice of Determination with the State Clearinghouse if the RAP is authorized. Next Steps DTSC will review and consider all public comments before making a final decision on the draft RAP. At the end of the public comment period, DTSC will evaluate all comments received to determine if the draft RAP should be rejected, revised, or finalized. DTSC will prepare and send a Responsiveness Summary to all who submitted comments. Information Repositories To review the draft RAP, and other related documents at the following: • DTSC Sacramento Office, 8800 Cal Center Drive, Sacramento, California 95826, For an appointment, call (916) 255-3758 • The Port's Offices, 2201 W. Washington Street, Stockton, California 95203, for hours, call (209) 946-0246 • Cesar Chavez Central Library, 605 North El Dorado Street, Stockton, California; for hours, call (209) 937-8221 • https://www.envirostor.dtsc.ca.gov/public/profile report?global id=39420010