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Boron can be a lab contaminant if borosiIicate -lass—Pyrex— is used in the analyses. I would not expect <br /> boron in this environment,but as it appears in some analyses, its actual presence should be verified.) <br /> Cations/Anions to retain: <br /> Ca Mg (hardness) <br /> Parameters such as major cations and anions, which will be useful for evaluating changes <br /> in water sources (if they occur) or in general geochemical modeling, could be eliminated <br /> from the list of analytes. In addition, cyanide, the N-bearing ligands, and several other <br /> parameters that appear in negligible amounts could be eliminated from further analyses. <br /> The following parameters I believe have been adequately characterized and could be <br /> eliminated from the list. <br /> Cr Se Ag <br /> Total Suspended Solids Total Dissolved Solids <br /> Cyanide <br /> Ammonia Chloride <br /> Nitrate Nitrite <br /> Sulfate Sulfide <br /> K Na <br /> In the past, the Division has allowed operators to submit baseline information for fewer <br /> than five quarters. It is generally to the operators advantage to characterize water quality <br /> under low flow conditions as metals concentrations are usually highest during that season, <br /> and baseline water quality would probably be established based on worst water quality. An <br /> October or November sample, collected after a precipitation-free period of a few weeks, <br /> could properly characterize the low flow season. <br /> Please call if you have questions or further comments. <br /> cc: Jim Pendleton <br />