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<br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman SL, Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866 3567 <br />FAX: (3031 832 8106 <br />Date: August 2, 1999 <br />To: Christina Kamnikar <br />DIVISION Of <br />MINERALS <br />GEOLOGY <br />0.EC LA MATION <br />MINING•SAFETY <br />Bill Owens <br />Governor <br />Greg E Walther <br />Executive Director <br />From: Harry Posey ~bcnael B. Eong <br />Drvision Dveanr <br />Subject: Review: Report on Storage of Cement Kiln Dust, Southdown, Inc. -Lyons Plant, <br />M-77-208 <br />The captioned operation, a limestone quarry, is permitted to discard cement kiln dust (CKD) <br />from the adjacent Lyons cement plant into the quarry pit. Because high alkalinity and leachable <br />metals occur in some kiln dusts the Division requested that the Operator examine the pH <br />characteristics and metals leachability of the CKD. Based on [hose results, for parameters that <br />exceeded water quality standards, the operator was [o examine the potential effects on <br />groundwater receptors via geochemical and/or hydrological modeling. The operator chose a <br />hydrological modeling approach consisting of mixing/dilution and dispersion. <br />TESTING AND MODELING <br />The report is awell-presented rendition of a sufficient geochemical assessment - ]eachate <br />analyses using an aggressive leach procedure - and a rational to conservative hydrological <br />modeling exercise. The leaching and modeling results are based on conservative assumptions. <br />Results were compared with groundwater standards for the more conservative of either the <br />drinking water or agriculture use. <br />Solutes from the CKD leach test exceeded water quality standards for several pazameters <br />as follows: <br />Pazameter Standard Result <br />Selenium (m ) 0.02 0.061 <br />Thallium (m ) 0.002 0.014 <br />TDS (m /L) 400 2050 <br />H (std units) 6.5-8.5 12.38 <br />Gross alpha (pCi/L) 15 26 ±28 <br />Gross beta (mrem/yr) 4 343±37 <br />