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vi <br />Abbreviations and Acronyms-Continued <br />NTU nephelometric turbidity units <br />NWQL National Water Quality Laboratory <br />PMCL proposed maximum contaminant level <br />POC particulate organic carbon <br />QC quality control <br />SDWR secondary drinking-water regulation <br />TT treatment technique <br />TVS table value standard <br />USEPA U.S. Environmental Protection Agency <br />USGS U.S. Geological Survey <br />WY wateryear (a 12-month period beginning October 1 and ending <br /> September 30 of the following year. A water year is <br /> designated as the year in which it ends.)