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'- `COLORADO LEGACY LAND <br /> Chromium III=Trivalent Chromium <br /> Chromium IV=Tetravalent Chromium <br /> Source: CDPHE. 2021. 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 9 OF 15 <br />