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The California Safe Drinking Water Act (SDWA) authorizes the State's Department of Health <br /> Services (DHS)to protect the public from contaminants in drinking water by establishing primary <br /> maximum contaminants levels(MCLs)that are at least as stringent as those developed by the EPA, <br /> as required by the federal SDWA. The California DHS lists any contaminants that may have any <br /> adverse health effects, based on expert opinion, and may occur in public water systems, including <br /> all the substances for which federal MCLs exist. <br /> Partner proposes that the analytical results of groundwater samples be compared to the February <br /> 27, 2015 MCLs promulgated by the DHS, Division of Drinking Water and Environmental <br /> Management. Title 22, California Code of Regulations Division 4. Environmental Health Chapter <br /> 15. Domestic Water Quality and Monitoring Article 4. <br /> June 2016 DTSC Human Health and Ecological Risk Office, Human Health Risk Assessment <br /> Note Number 3 <br /> The DTSC's HERO HHRA Note 3 incorporates modified screening levels based on the USEPA <br /> RSLs for use in the human health risk assessment process at hazardous waste sites and permitted <br /> facilities. <br /> Partner proposes that the analytical results of applicable soil gas samples be compared to the <br /> October, 2015 Screening Levels for Volatile Compounds in Ambient Air using the procedures <br /> outlined in HERO HHRA Note 3. <br /> August 23, 2014 DTSC Human Health and Ecological Risk Office, Human Health Risk <br /> Assessment Note Number 5 <br /> The U.S. EPA Region 9 released TCE guidance on December 3, 2013 for expanded sample <br /> collection in the investigation of the Vapor Intrusion (VI) exposure pathway at specific National <br /> Priority List sites in the San Francisco, California South Bay.Accelerated Response Action Levels <br /> and Urgent Response Level Action Levels for indoor air concentrations of TCE under residential, <br /> commercial/industrial (8-hour workday), and commercial/industrial (10-hour workday) exposure <br /> scenarios were presented in this document. <br /> Use of these Region 9 Interim Action Levels to sites beyond the NPL South Bay sites in San <br /> Francisco, California was provided in the June 30, 2014 U.S. EPA Region 9 Regional <br /> Toxicologist's memorandum,released under a July 9,2014 transmittal memorandum from Enrique <br /> Manzanilla, Director of the Superfund Division, U.S. EPA Region 9 <br /> Partner proposes that any analytical results of TCE detections within indoor air samples be <br /> compared to the August 23, 2014 indoor air Commercial Accelerated Response Action Level <br /> Sampling and Analysis Workplan <br /> Tracy Corners Shopping Center <br /> 3225 North Tracy Boulevard <br /> Tracy,California 95376 <br /> Partner Project Number SM14-129814 <br /> Docket Number HAS-VCA 14/15-108 <br /> August 15,2016 <br /> Page 32 <br />