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IP-RZ, <br /> GAVIN NEWSOM <br /> GOVERNOR <br /> C0.LI i0 R LI I• JAIREo NFELD <br /> SECRETARRY FOR <br /> Water Boards ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 22 June 2022 <br /> David M. Share, Director <br /> Olin Corporation, Environmental Remediation Group <br /> 3855 North Ocoee Street, Suite 200 <br /> Cleveland, Tennessee 37312 <br /> DMShare(a)olin.com <br /> CENTRAL VALLEY WATER BOARD RESPONSE TO: WELL DECOMMISSIONING <br /> AND REPLACEMENT WELL INSTALLATION WORK PLAN, OLIN CHLOR ALKALI <br /> FACILITY, TRACY, SAN JOAQUIN COUNTY, CALIFORNIA <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br /> has reviewed the 11 April 2022 Well Decommissioning and Replacement Well <br /> Installation Work Plan (Work Plan) for the Olin Chlor Alkali Facility (Olin Chlor), Tracy, <br /> California (Site). Prepared on your behalf by Wood Environment & Infrastructure <br /> Solutions, Inc. (Wood), the Work Plan proposes to decommission five groundwater <br /> monitoring wells (MW-1, MW-3, MW-6, MW-7, and MW-16) and install one new <br /> groundwater monitoring well (MW-17). <br /> Central Valley Water Board staff has the following comments: <br /> COMMENT 1 <br /> Issue: Section 3.0 Decommissioning Methods states each well will be over drilled using <br /> the same size drilling auger used during installation. The San Joaquin Well Standards <br /> (Well Standards (sigov.org)), Section 6.3.6, states, <br /> "For the protection of the seal, and to facilitate the future use of the land <br /> site, a hole at least one foot larger in diameter than the originally drilled <br /> hole shall be excavated around the outside of the well casing" <br /> Requested Action: Central Valley Water Board staff requests over drilling each well at <br /> least one foot larger in diameter than the original borehole to comply with the San <br /> Joaquin Well Standards. <br /> MARK BRADFORD, CHAIR I PATRICK PULUPA, ESQ., EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200, Rancho Cordova, CA 95670 1 www.waterboards.ca.gov/centralvalley <br />