PERMFILE56460

• Permit No: M2004067
• IBM Index Class Name: Permit File
• Doc Date: 8/12/2005
• Doc Name: req for assistance on radiation monitoring
• From: COPHE
• To: DMG
• Media Type: D
• Archive: No

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STATE OF COLORADO
Bill Owens, Governor
Douglas H. Benevento, Acting Executive Director
Dedicated to protecting and improving the health and environment of the people of Colorado
4300 Cherry Creek Dr. 5.
Denver, Colorado 80246-1530
Phone [phone]
TDD Line [phone]
Located in Glendale, Colorado
http://www.cdphestate. co. us
July 28, 2005
Lahoratory and Radiation Services Division
8100 Lowry elvd.
Denver, Colorado 80230-6928
[phone]

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Colorado Department
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Bruce Humphries - -° - - "~ - '- - - " --
Division of Minerals & Geology
Colorado Department of Natural Resources
1313 Sherman Street, Room 215
Denver, Colorado 80203
RE: Request for assistance on radiation monitoring: Clear Creek District Water Provider, LLC,
MMRR Quarry application: File No. M-2004-067
Deaz Mr. Humphries:
This letter is written in response to your July 13, 2005 letter to Mssrs. Egidi, Hea, and Gates of the
Colorado Department of Public Health and Environment (the Department) requesting information on
radiation monitoring during open-pit mining operations. Replies to your questions come from three of
the Department's Environmental divisions.
The Radiation Management Unit (RMU) of the Hazazdous Materials and Waste Management Division
offers the following comments.
The RMU has no jurisdictional oversight of quarry operations that may produce radioactive
media incidental to the principal mining activities. The RMU will make suggestions based
on expertise in radiometric measurement and evaluation.
2. The RMU does not have any specific written guidance regarding quarry operations. We can
offer reasonable suggestions for assessing concerns about any produced radioactive media.
Drill cuttings and boreholes can be quickly screened using aGeiger-Muller or Scintilation-
type gamma-ray monitoring device. Boreholes can be logged with agamma-ray detector to
find zones of increased uranium or thorium mineralization. Samples or zones with elevated
readings can be further characterized using mineralogy and/or radioisotope measurement
techniques. Aradiation-monitoring program for workers would be prudent. Radiation
exposure to people should be less than 0.025 REM per year above background.