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DIVISION OF RECLAMATION,MINING AND SAFETY STATE OF COLORADO <br /> Department of Natural Resources <br /> 1313 Sherman St.,Room 215 <br /> Denver,Colorado 80203 D O L D RA D O <br /> Phone:(303)866-3567 D t v t s t o N o f <br /> RECLAMATION <br /> FAX:(303)832-8106 MINING <br /> ' SAFETY <br /> February 24,2009 <br /> Bill Ritter,Jr. <br /> Mr.Joel Bolduc Governor <br /> Holcim (US)Inc Harris D.Sherman <br /> � Executive Director <br /> 3500 Highway 120 <br /> g y Ronald W.Cattany <br /> Florence, CO 81226 Division Director <br /> Natural Resource Trustee <br /> Re: Proposed Groundwater Monitoring Plan,DRMS Permit#M-1977-344 Portland Cement Plant. <br /> 1 <br /> Dear Mr.Joel <br /> To fulfill the requirements of Technical Revision#6,for permit#M-1977-344, Portland Cement quarry and <br /> plant,ground water monitoring plan, the Division sets the following monitoring and compliance wells . <br /> ' The site is located in Fremont County, North side of the Arkansas River. Groundwater flows in the area in a <br /> southerly direction towards the river. <br /> Holcim will sample MW-7 WELL Compliance well,annually for the following parameters. <br /> Total Dissolved Solids (TDS) 3,918 MG/L <br /> Sulfate (SO4) 2,080 MG/L <br /> Potassium(K) 17 MG/L <br /> Sodium (Na) 22261bIG/L <br /> Iron (Fe) 4.5 MG/L <br /> Manganese (Mn) 0.88 MG/L <br /> In addition Holcium will drill in April 2009, compliance well MW-13 near the entrance to the quarry and <br /> will provide five quarters of data, so the Division will determine the appropriate parameters for the well. and <br /> set compliance parameters. In addition to MW-7, Holcim will also monitor MW-12, as a background well <br /> and provide the same parameters as MW-7 on an annual basis. When two consecutive parameters are <br /> exceeded more than 10%, during the reporting year for compliance well MV-7, Holcim will increase the <br /> frequency of monitoring to bi-yearly. If the upward trend continues, Holcim will submit an explanation and <br /> provide a remedial plan. <br /> ' If you have questions, please contact me at 302 866-3567 xt 8129. <br /> _Sincerely, <br /> Bcrhan f lew <br /> ' Office of Office of <br /> Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines <br />