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CO DEPT HELTH HAZ MAT Fax: 3036399833 Jul 29 2005 13:48 P. 02 <br />STATE OF <br />sm Dwane, Governor <br />Douglas H. aeneventa, Ming Executive Director <br />Dedicated to protecting and lmprov(ng the health and environment of the people of Colorado <br />4300 Cherry Creak Dr. 5. Laboratory and Radiation Services Division <br />Denver, Colorado80246.1530 a100 Lowry Blvd. <br />Phone 1303) 692.2000 Denver, Colorado 80230-6928 <br />TDD Line (303} 69)-7700 f303) 692-3090 '"` ° ~ <br />Located in Glendale, Co~crado '~ ~-: ~ ~ IVED <br />h ttp!/www. cdphe.atate. cv. us <br />July as, coos <br />Bruce Humphries <br />Division of Minerals & Geology <br />Colorado Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Deaver, Colorado 80203 <br />AUG 012005 <br />Owiaion of Mmerels and (iieelOQy <br />RE: 'Request for assistance on radiation monitoring: Clear Creek stnct ater provider, LLC, <br />MMRR Quarry application: File No. M-2004-067 G~~ t ~~~:~` <br />Dear Mr. Humphries: <br />This lctter is written in responsc to your July 13, 2005 letter to Mssrs. Egidi, Hes, and Gates of the <br />Colorado Depardnent of public Health and Environment (the Department) requesting information on <br />radiation monitoring during open-pit mining operations. Replies to your questions come from three of <br />the Department's Environmental divisions. <br />'The Radiation Management Unit (RMin of We hazardous Materials and Waste Management Division <br />offers the following comments. <br />1. 'The RMU has no jurisdictional oversight of quarry operations That may produce radioactive <br />media incidental to the principal mining activities. The RMU will make suggestions based <br />on expertise in radiometric measurement and evaluation. <br />2. The RMU does not have any specific written guidance regarding quarry operations. We can <br />offer reasonable suggestions for assessing coacems about aay produced radioactive media <br />.Drill cuttings and boreholes can be quickly screened using aGeiger-Moiler or Scintilation- <br />type gamma-ray monitoring device. Boreholes can be logged with agamma-ray detector to <br />find zones of increased uranium br thorium mineralization. Samples or zones with elevated <br />readings can be further charactcrized using mineralogy andlor radioisotope measurement <br />techniques. Aradiation-monitoring program for workers would be prudent. Radiation <br />exposure to people should be less than 0.025 REM per year above background. <br />