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COLORADO LEGACY LAND <br /> Chromium III=Trivalent Chromium <br /> Chromium VI=Hexavalent Chromium <br /> Source: CDPHE. 2 02 1. Regulation No.38 Stream Classification and Water Quality Standards,Clear Creek Basin,Segment 17b.Mainstem of Ralston Creek Including all Tributaries and Wetlands from the Source to the Inlet of Arvada Reservoir.December. <br /> PAGE 10 OF 17 <br />