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GAMIN NEWSOM <br /> Gâť‘YrrtNOtt <br /> YANA <br /> c s u F x R x l a GARCIA BEORETAARY FOR <br /> Water Boards ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 20 April 2026 <br /> Dane Grimshaw <br /> Olin Corporation, Environmental Remediation Group <br /> 3855 North Ocoee Street, Suite 200 <br /> Cleveland, Tennessee 37312 <br /> DRGrimshaw(D_olin.com <br /> CONDITIONAL NO FURTHER ACTION DETERMINATION, OLIN CHLOR ALKALI <br /> FACILITY, TRACY, SAN JOAQUIN COUNTY, CALIFORNIA <br /> The California Central Valley Regional Water Quality Control Board (Central Valley <br /> Water Board) has reviewed the 19 September 2025 Revised Request for No Further <br /> Action (Revised NFA Request) for the Former Olin Chlor Alkali Facility (Olin Chlor), <br /> Tracy, San Joaquin County, California (Site; Geosyntec Consultants [Geosyntec], <br /> 2025). The Central Valley Water Board concurs with a No Further Action (NFA) <br /> determination for the Site, conditional upon additional closure actions by Olin Chlor. <br /> On 7 November 2025, the Central Valley Water Board provided a 30-day public notice <br /> to PG&E for distribution and notification to adjacent property owners and other <br /> interested stakeholders of their opportunity to provide comments on this request for <br /> closure (Attachment 1). The Central Valley Water Board also placed the notice on their <br /> public webpage. No public comments were received. <br /> The Final NFA Determination will be granted once the following tasks are completed: <br /> 1. Olin Chlor submits the necessary documentation for the destruction of the <br /> existing groundwater monitoring wells and any other borings or structures used <br /> for site assessment and remediation, in accordance with all applicable County <br /> and State requirements (i.e., well destruction work plan, completion report, etc.). <br /> Once the above tasks are completed, Central Valley Water Board staff will send written <br /> confirmation of the effective date of Final NFA Determination and termination of revised <br /> Monitoring and Reporting Program (MRP) No. R5-2012-0813-02 issued on <br /> 31 May 2022 (Central Valley Water Board, 2022). <br /> Issuance of a No Further Action determination does not preclude future action by the <br /> Central Valley Water Board if subsequent monitoring, testing, or analysis indicates that <br /> the remedial action standards and objectives were not achieved; a new or previously <br /> undiscovered release occurs at the Site; or if new information indicates that further site <br /> investigation and remedial action are required to prevent a significant risk to human <br /> health and safety, the environment, or water quality. <br /> NICHOLAS AVDIS, CHAIR I PATRICK PULUPA, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive,#200, Rancho Cordova,95670-6114 1 www.waterboards.ca.gov/centralvalley <br />