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• <br />WARNING <br />0 <br />Water quality samples collected by BLM personnel in the Montrose District, <br />prior to 1983, were analyzed by the United States Geological Survey National <br />Water Quality Lab in Arvada, Co. It has been brought to our attention that <br />waters analyzed by this lab, during the late 1970's and early 1980's, may <br />experience elevated levels of lead, cadmium and chromium. Apparently, sealant <br />used on ampules of acid used to fix water samples contained these constituents <br />and resulted in sample contamination. Therefore, the accuracy of lead, cadmium <br />and chromium concentrations in water samples analyzed prior to 1983 are in <br />question and should not be used to make determinations that attempt to reflect <br />actual water quality conditions. <br />BLM Montrose District Hydrologist <br />