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STATE OF COLORADO <br />OI VISION OF MINERALS AND GEOLOGY <br />Department o/Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80703 <br />n l V 15 1 o N. O F <br />Phone: (3031 866-3567 MINERAL S <br />FA%: t3o31 93 2-81 06 & <br /> GEOLOGY <br />' <br />' 0.ECLA NATION <br />NINING•s AF ETV <br />November 7, 2002 <br /> siu ovens <br />Mr. Steve Mossberg Gwemor <br />CEMEX ~ Greg E. Watcher <br />P.O. Box 529 Executive DireR« <br />Lyons, CO 80540 Acing Dlvu ~ D ect« <br />RE: CEMEX, Inc., Lyons Mine, Permit No. M-1977-208 <br />Groundwater Monitoring for CKD <br />Deaz Mr. Mossberg, <br />The Division of Minerals and Geology has reviewed the groundwater monitoring requirements for the <br />CKD as specified in Technical Revision Ol (TR-01). Attached is a memo from Harry Posey of DMG <br />providing a synopsis and recommendation for CKD groundwater monitoring. <br />In summary, the numeric protection levels (NFL's) are as follows: <br />pH 6.5-8.5 std. units <br />Conductivity Measure and report <br />Se 0.02 mg/L <br />Tl 0.002 mg/L <br />Monitoring must be reported twice yearly, and submitted with the Annual Reclamation Report. The <br />Division recommends that more frequent monitoring be conducted for pH and conductivity than what <br />was appzoved in TR-01. In the event pH of conductivity increases, the Division should be notified and <br />more frequent monitoring far possible metal contaminants should be conducted and reported. <br />Jn regard to the test bum of tires in the plant, CEMEX will need to subject the ash to representative leach <br />tests. The particular leach test can be determined by the operator with DMG approval of the method. <br />The SPLP EPA Method 1312, analyzed for soluble organics, metals, SO4, and pH might be an acceptable <br />method. <br />Jf you have any questions, please do not hesitate to contact me at 303-Sbfr4943. <br />Sin ely, c / ^ <br />J ' (.~1J <br />Erica S. Crosby <br />Environmental Protec pecialist <br />Enclosure (Memo from Harry Posey; DMG) <br />cc: Cazl Mount; DMG <br />Hazry Posey; DMG <br />John Lohr; CEMEX (wJenclosure) <br />