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5TATE OF COLORADO <br /> DIVISION OF MINERALS AND GEOLOGY <br /> Department of Natural Resources <br /> 1313 Sherman St, Room 215 <br /> Denver,Colorado 80203 <br /> Phone (303)866-3567 <br /> FAX (303)832-8106 <br /> DEPARTMENT OF <br /> NATURAL <br /> RESOURCES <br /> FAX COVER SHEET (Fax # 303-832-8106) cove Omer <br /> James S Lochhead <br /> TO: Bryce Romig Executive Director <br /> Michael B Long <br /> Division Director <br /> COJAGENCY: Climax Molybdenum Company <br /> FROM: Allen Sorenson FAX NO.: (719) 486-2252 <br /> MESSAGE TO RECIPIENT: <br /> During the Climax mine site inspection conducted on 7-2-98, we discussed chemical <br /> compatibility testing of soil/bentonite ground water cutoff walls with acidic or otherwise <br /> contaminated liquids. There is considerable discussion in the slurry wall literature <br /> discussing the necessity of establishing compatibility of wastes and contaminants in contact <br /> with slurry wall materials. There is also discussion of the potential to develop alternate <br /> trench Backfill mixtures designed to resist attack by acids, bases, salt solutions, and organic <br /> chemicals. However, I have been unable to locate much information on how the chemical <br /> compatibility testing is conducted. ASTM standard D6141-97 (summary attached) discusses <br /> a test method of the effect on bentonite swelling. Ion exchange capacity testing (summary <br /> attached)should also be conducted. The following articles,which I have not as yet read,may <br /> be useful. <br /> Zappi, M.E., D.D. Adrian, and R.R. Shafer, 1989. "Compatibility of Soil-Bentonite <br /> Slurry Wall Backfill Mixtures with Contaminated Groundwater," in Proceedings of <br /> the 1989 superfund Conference, Washington, DC. <br /> Zappi, M.E., R.A. Shafer, and D.D. Adrian, 1990. "Compatibility of Ninth Avenue <br /> Superfund Site Ground Water with Two Soil-Bentonite Slurry Wall Backfill <br /> Mixtures," WES Report No. EL-90-9. <br /> DATE: 7/16/98 \/ NUMBER OF PAGES TO FOLLOW: 2 <br /> PROGRAM: MINS. l'... COAL AML M. SAFETY <br /> TIME TO BE SENT: ASAP" or NIGHT RATE <br /> Woss\Fa For gaw <br />