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ADDITIONAL ABBREVIATI <br />E <br />GC/MS <br />HPLC <br />l~g~- <br />µm <br />mm <br />MRL <br />NAWQA <br />NWQL <br />UCOL <br />USEPA <br />WY <br />chromatography/mass spectrometry <br />i-performance liquid chromatography <br />rograms per liter <br />method reporting limit <br />National Water-Quality Assessment <br />National Water Quality Laboratory <br />~Jpper Colorado River Basin study unit <br />U.S. Environmental Protection Agency <br />water year <br />CONTENTS VII <br />