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STATE OF COLORADO <br /> DIVISION OF RECLAMATION,MINING AND SAFETY <br /> Department of Natural Resources <br /> 1313 Sherman St.,Room 215 <br /> Denver,Colorado 80203 D O L O o N DO <br /> Phone:(303)866-3567 RECLAMATION <br /> FAX:(303)832-8106 MINING <br /> &- <br /> SAFETY <br /> February 24,2009 <br /> Bill Ritter,Jr. <br /> Governor <br /> Mr.Joel Bolduc <br /> Harris D.Sherman <br /> Holcim, (US)Inc Executive Director <br /> 3500 Highway 120 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 /> 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) 226 MG/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 /> erhan Keffele <br /> Office of Office of <br /> Mined Land Redamation Denver • Grand Junction • Durango Active and Inactive Mines <br />