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PUBLIC NOTICE <br /> Former Olin Chlor Alkali Facility <br /> Tracy, California <br /> California Public Notice: The Central Valley Regional Water Quality Control Board <br /> Environmental (Water Board) invites public comment on a request for regulatory closure, <br /> Protection Agency made on behalf of Olin Corporation (Olin), for groundwater at the former <br /> Yana Garcia Olin Chlor Alkali facility, located at 26700 South Banta Road in Tracy, <br /> San Joaquin County, California (Site). This Public Notice fact sheet <br /> Secretary for provides general information on the Site and a map showing the location <br /> Environmental of the Site (Figure 1). <br /> Protection PUBLIC COMMENT PERIOD: 7 November 2025 — 7 December 2025 <br /> CASE SUMMARY: <br /> 0 Wo Water Board staff concur with Olin's request for regulatory closure, or 'no <br /> 00further action' (NFA) for groundwater at the Site. In 2000, the Water <br /> C A L I F 0 R N I A Board concluded there had been sufficient cleanup of Site soil and issued <br /> Water Boards a staff acceptance letter. This fact sheet relates to NFA for the Site <br /> groundwater. <br /> State Water Resources From 1975 to 1989, All-Pure Chemical Company operated the Site as a <br /> Control Board bleach manufacturing and distribution facility. In 1989, Pioneer Americas <br /> Inc. (Pioneer) acquired the All- Pure business and began leasing the Site. <br /> E. Joaquin In 2007, Olin acquired Pioneer and continued bleach production on the <br /> Site. From 1975 through 2022, Site operations included production of <br /> Esquivel, Chair sodium hypochlorite (liquid bleach) from chlorine and caustic soda, <br /> Central Valley Regional storage and distribution of calcium hypochlorite, repackaging of chlorine <br /> Water Quality Control gas and sulfuric acid, and truck maintenance in an on-Site shop. Bleach <br /> manufacturing and distribution operations ceased during the second <br /> Board quarter of 2022. The Site is currently vacant. <br /> Nicholas Avdis, Chair Between 1988 and 1998, elevated concentrations of chloroform and <br /> carbon tetrachloride were found in soil and groundwater near six ponds. <br /> Public Notice — Four were wastewater ponds for manufacturing process liquid <br /> No Further (Stormwater Pond, Small Wastewater Pond, and Ponds 1 and 2) and two <br /> Action Status were water storage for fire suppression (Fire Ponds 1 and 2). Between <br /> 1994 and 1997, the former Stormwater Pond, Small Wastewater Pond, <br /> Former Olin Chlor and Fire Ponds 1 and 2 were sampled and it was determined that <br /> Alkali Facility excavation was not warranted. Therefore, the four ponds were backfilled <br /> for closure. In 1999, 3,200 cubic yards of soil were excavated from Ponds <br /> 1 and 2 and disposed of off-Site. The excavation areas were backfilled <br /> with clean soil, and the ponds were closed. In 2000, the Water Board <br /> concluded there had been sufficient cleanup of Site soil and issued a <br /> staff acceptance letter for the closure of the soil investigation. <br /> In 2001, monitored natural attenuation was selected as the groundwater <br /> remedy for low concentrations of chloroform and carbon tetrachloride <br /> present in on-Site groundwater and off-Site groundwater to the <br /> Page 1 of 3 <br />