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wood. <br /> WELL DECOMMISSIONING AND REPLACEMENT WELL INSTALLATION <br /> WORK PLAN <br /> Olin Chlor Alkali Facility <br /> 26700 South Banta Road, <br /> Tracy, California <br /> 1.0 INTRODUCTION <br /> On behalf of Olin Corporation ("Olin"), Wood Environment & Infrastructure Solutions, Inc. <br /> ("Wood") is submitting this Well Decommissioning and Replacement Well Installation Work Plan <br /> ("Work Plan") to the Central Valley Regional Water Quality Control Board (CVWB) for review <br /> and approval. This Work Plan proposes to decommission select groundwater wells associated <br /> with the Olin Chlor Alkali Facility ("Site") located at 26700 South Banta Road, Tracy, California <br /> (Figure 1). <br /> The existing Monitoring and Reporting Program (MRP) R5-2012-0813 was promulgated on <br /> May 30, 2012 and was last revised on July 30, 2018 (CVWB, 2018). On December 17, 2021, <br /> Wood submitted the Proposed Revisions to Monitoring and Reporting Program R5-2072-0813 <br /> (Wood, 2021), which recommended decommissioning wells MW-1, MW-3, MW-6, MW-7, and <br /> MW-16 (Figure 2). Monitoring well MW-6 will be abandoned and data from MW-5 will be used <br /> instead. These wells are recommended for decommissioning because they are either damaged, <br /> have been dry for the past three years, or are cross-gradient wells with historically low or non- <br /> detect concentrations. Decommissioning the selected wells at the site is appropriate, will not <br /> compromise the MRP objectives, and will reduce or eliminate sampling in wells that do not <br /> provide necessary data. Based on conversations with the CVWB on March 8, 2022, one <br /> replacement well MW-17 will also be installed downgradient of the MW-3 and the former <br /> ponds. <br /> 2.0 BACKGROUND <br /> The Olin Chlor Alkali Facility ("Site") comprises a 15-acre triangular parcel west of the San <br /> Joaquin River within the San Joaquin Valley and is bounded to the west by South Banta Road, <br /> to the south by agricultural lands, and by the California Southern Railroad (owned by Union <br /> Pacific Rail Road and operated by Genesee &Wyoming Inc. [G&W]) to the northeast. The <br /> https://woodpIc.sharepoint.com/teams/OlinTracy/Shared Documents/General/03.0 DocCtrl/2022 Decomm WP/Revised Decomm <br /> WP/01_text/202207_Tracy_Wood_Decomm WP_text.docx <br />