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® ('a AVIN I`IEWSOM <br /> C'CJVFHN(]H <br /> Water Boards ENV E GAR CIA <br /> ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> TO: Christopher T. Flower, P.G. <br /> Supervising Engineering Geologist <br /> Site Cleanup Program Manager <br /> LA G N0��Cis� <br /> o <br /> FROM: Amber L. Ginorio, P.G. <br /> Engineering Geologist x 10216 x <br /> Site Cleanup Program <br /> Federal Cleanup Unit s <br /> TqT fOF CAL1FO�a`P <br /> Mark W. Clardy, P.G. <br /> Senior Engineering Geologist <br /> Unit Chief - Site Cleanup Program 7055 <br /> Federal Cleanup Unit <br /> �oF <br /> DATE: 26 March 2026 <br /> SUBJECT: RATIONALE FOR CONSIDERING CONDITIONAL NO FURTHER <br /> ACTION, OLIN CHLOR ALKALI FACILITY, 26700 SOUTH BANTA ROAD, TRACY, <br /> SAN JOAQUIN COUNTY <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br /> has prepared this memo summarizing the Olin Chlor Alkali Facility (Olin Chlor) request <br /> for regulatory closure at 26700 South Banta Road, Tracy, San Joaquin County, <br /> California (Site; Figure 1). This memo serves only as a summary of significant activities <br /> conducted at the Site and does not constitute a complete summary of all Site activities. <br /> For a complete case history, please review the files regarding this site on GeoTracker at <br /> https://geotracker.waterboards.ca.gov/profile report.asp?global id=SL185422914 or at <br /> the Central Valley Water Board office. <br /> Setting: <br /> The Site is a 15-acre triangular parcel bound by South Banta Road to the west, <br /> agricultural property to the south, and the California Northern Railroad line to the east <br /> (Figure 2). The Site is currently developed with a former production building, tank farm, <br /> and maintenance and storage areas, and a stormwater pond is in the southeast portion <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 />