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northeast. Based on monitoring conducted between 2002 and 2025, natural attenuation is occurring, and <br /> the extent of carbon tetrachloride and chloroform in on- and off-Site groundwater has been delineated. <br /> Where present, remaining concentrations of carbon tetrachloride and chloroform in groundwater are <br /> localized, stable or decreasing over time, and not migrating. <br /> On-site concentrations of contaminants are below maximum contaminant levels (MCLs), the highest level <br /> of a contaminant that is allowed in drinking water. Off-site detections above MCLs are limited to carbon <br /> tetrachloride at two locations, where concentrations are expected to decrease to below the MCL within <br /> approximately 10 years. <br /> If there are no major concerns raised during the public comment period, the Water Board concurs with <br /> Olin's request for NFA for groundwater at the Site. <br /> The request for NFA is now open to the public for comments and concerns for a period of 30 days. <br /> WHERE DO I GET MORE INFORMATION? <br /> Historical reports and the request for NFA for groundwater can be viewed by accessing the State Water <br /> Resources Control Board's GeoTracker website for the Site by scanning the QR code below or visiting: <br /> (https://geotracker.waterboards.ca.gov/profile_report?global_id=SL185422914). Documents from the <br /> public comment period will be published to GeoTracker. <br /> The case file for the Site is also available for review at the Central Valley Regional Water Quality Control <br /> Board office located at 11020 Sun Center Drive, Suite 200, Rancho Cordova, CA 95670. To make an <br /> appointment for a file review, please email Amber Ginorio at amber.ginorio(a)waterboards.ca.gov. <br /> HOW DO I PARTICIPATE? <br /> Contact Amber Ginorio with the Water Board below to learn more about the case. Please submit <br /> comments on the planned regulatory closure for the Site to Amber Ginorio at the Water Board by <br /> 7 December 2025. <br /> Ms. Amber Ginorio O O Central Valley Regional Water Quality Control BoardM. <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> 916-464-4670 <br /> amber.ginorio(a)waterboards.ca.gov <br /> Scan this QR code to visit the <br /> GeoTracker webpage for the Site. <br /> Page 2 of 3 <br />