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Department of Toxic Substances Control Meredith Williams, Ph.D., Director Yana Garcia 8800 Cal Center Drive Gavin Newsortt Secretary for Governor Environmental Protection Sacramento, California 95826-3200 RESPONSIVENESS SUMMARY FOR THE REMEDIAL ACTION PLAN, SITE 47, ROUGH AND READY ISLAND, PORT OF STOCKTON, STOCKTON, CALIFORNIA October 18, 2023 The purpose of this document is to present a written response by the Department of Toxic Substances Control (DTSC) during the 30-day comment period held for the Draft Remedial Action Plan (RAP). DTSC provided a comment period to solicit public comments on the August 2023 draft RAP for the Rough and Ready Island (RRI). The RRI is located at 2201 W. Washington Street, Stockton, California, 95203. Concurrent with the release of the RAP for public review and comment, DTSC placed the public notice in the Stockton Records-on August 8, 2023, to announce the public comment period. The RAP was available for public review at DTSC' EnviroStor website, the Cesar Chavez Central Library in Stockton, Port of Stockton at 2201 W. Washington Street, Stockton, and DTSC Sacramento Office at 8800 Cal Center Drive in Sacramento. The RAP, Fact Sheet, Public Notice, Remedial Investigation/Feasibility Study, and the California Environmental Quality Act (CEQA) documents were also posted on the Internet at: https://www.envirostor.dtsc.ca.gov/public. The 30-day comment period started August 10, 2023, and ended September 12, 2023. A public virtual meeting was held on August 30, 2023 from 6:00 p.m. — 8:00 p.m. to address the public's concerns. During the public comment period no public comments were received. The military used the RRI after World War I, and the navy transferred the RRI to the Port in 2000 — 2011. The Port received Site 47 in 2003. Site 47 is in an industrial area within the southern portion of RRI. Site 47 contains a former model airplane landing strip and skeet / trap shooting range. Most of Site 47 is unpaved. Investigation conducted between 1995 — 2020 found metals (primarily arsenic), polycyclic aromatic hydrocarbons and organochlorine pesticides in the soil and sediment. The RAP was prepared to select a remedy for soil and sediment within Site 47 and adjacent areas on RRI. The remedy would be implemented to support redevelopment of Site 47 for commercial/industrial use. The RAP proposed five remedial alternatives: 1) No Action, 2) Existing Durable Cover, Fence, and Institutional Controls (IC), e Printed on Recycled Paper