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CO DEPT HELTH HAZ MAT Fax:3036399833 Jul 29 2005 13: d8 P. 02 <br />STATE OF COLO~O <br />8111 Owem, Goverrar <br />Dou8lar H. Benevenlq Acting Executive Diretmr <br />Dedicated to protecting and lmprovlrlg dre lteahh and envirnrrment d t!a pegob olCO/orado <br />4300 Cherty Creek Dr. 5. tabormxy and Radiation Services Divlilon <br />Denver, Co aado 80446.1530 8100 Lowry etvd. <br />Fhorte (303) 694.4000 Darver, Cobndo 80230-692a <br />1DD Line U03) 691-7700 (303) 692-3090 _ -~ v r= ~VE~~ _ _ -- _ - <br />-- ~ocatad-1nLkndale,tolorado ------ --- <br />httpJMww.cdphe.rOk.co. car <br />ltrly 28, zoos <br />Bruce Hurrrphrios <br />Division ofMinerale & C3eology <br />Colorado Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denier, Colorado 80203 <br />AUG 012005 <br />Bv+Ma+ of Mxtarak and Geolop/ <br />RE: Request for assiatanca on radiation monitoring: Clear Creek District Water Provider, ]..LC, <br />MMRR Quarry application: File No. M-2004-067 <br />Dear Mr. Humphries: <br />This letter is written in response to your July 13, 200s letter to Marrs. Egidi, Haa, and (~atea of t13a <br />Colorado Deparhrrtmt of Public Health sad Environmorrt (the Department) ieque;stiug information on <br />radiation monitoring during open-pit mining operations. Replica to your questions come firm throe of <br />the Depaztment's Environmomal divisions. <br />TheRadiation Management Unit (RMIn of the Hazardous Materials and Waste Management Division <br />offers the following oommoats. <br />1. The RMU has no jurisdictional ovemBiglmt of quarry operations that may produce radioactive <br />media incidental to rho principal mining activities. The RMU will make suggestions based <br />on expertise in radiometric meaeurament and evaluation. <br />2. The RMU does not have any specific written guidance regarding quarry operations. We can <br />offer reasonable suggestions £or' assessing concerns about atiy produced radioactive media <br />. Drill cuttings and boreholes can be quiokly screamed using a C3elgar-Mullar or 5ciatilation- <br />type gamma-ray monitoring device. Boreholos can beloggedwith sgamma-ray dateetor to <br />find zones of incrteased ruanium or thorium mineralization Samples or zones with elevated <br />reading can be further characterized using mineralogy aadJor radioisotope measurement <br />techniques. A radiation-monitoring program for workers would bo prudent. Radiation <br />acposlrre m people should be leas than 0.025 REM per year above background. <br />