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MININL AN(",I1NF I 1 <br /> PRUCE E,S 1 If tAC A, P.IF. <br /> NALCO CHEMICAL COMPANY <br /> 2422 SDUTH DOV/NING STREET DENVEFR COLORADO B0210 - AREA 303-777-9590 <br /> November 12, 1984 <br /> Mr. Doug Bowman <br /> Mid-Continent Coal & Coke <br /> P.O. Box 158 <br /> Carbondale, Colorado 81623 <br /> Dear Mr. Bowman: <br /> I realize the difficulties imposed upon you by the State to meet certain <br /> effluent standards, but as we both concluded, some are obtainable while <br /> others are economically impractical. Given your situation and environment <br /> where feed systems would have to be installed, the drip system, as you <br /> suggested, adjusted by a valve and measured by hand with a graduated <br /> cylinder would be by far the most practical and economical. Since the <br /> State in concerned that at times you might be overdosing and possibly <br /> polluting the river I suggest you consider using NALCO 8103 which is a <br /> potable version of the product you are now using, NALCO 8852. Enclosed <br /> you will find a Product Bulletin and Material Safety Data Sheet. <br /> I have looked through the file for Mid-Continent to see if I could find <br /> the dosage and dilution that we previously recommended and have come up <br /> with the following. The dosage should be 1 to 2 ppm and as far as dilution <br /> goes I could find no record of this information. I would suggest that we <br /> derive a dilution based upon some guess as to chemical consumption per <br /> feed location and dilute so that the drum need not be changed to frequently <br /> or whatever is acceptable to you. I will have to discuss this aspect in <br /> greater detail with you so we can come up with a reasonable way to estimate <br /> product dilution. <br /> Sincerely, <br /> Rolf B. Arndt <br /> District Representative <br /> Mining and Mineral Process Chemicals <br /> Nalco Chemical Company <br /> RBA:jep <br /> Enclosures <br /> cc: Mr. John Turner <br /> CORPORATE OFFICES 2901 BUTTERFIELO ROAD ❑ OAK BROOK, ILLINOIS BC521 ❑ AREA 312-BB7-7500 <br />