2011-12-09_REPORT - M1977004 - Laserfiche WebLink

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Location microR (pr /hr) Average Counts Per Minute Pitch Mine Workshop 90 138 IC -10300 Undisturbed soil 90 -- IC -10300 Utility Excavation Pit 100 -- IC -10370 Undisturbed Soil 87 -- IC -10370 Utility Excavation 255 -- Ty Camp Creek Disposal Cell 87 -- Indian Hill Disposal Cell 82 -- Personnel Survey (Hand) -- 81 Personnel Survey (underside of boot) -- 50 AR IS Model 19 microR meter were deployed to provide a baseline assessment of radiation at the drilling locations. Results are detailed in Table A. Table A - baseline radiation survey results. The Ludlum model 44 -40 is considered a "frisker" or a meter used to determine if radioactive particles have accumulated on surfaces during interaction with site materials. A background measurement was taken at the Pitch Mine workshop, located onsite. Results indicate that the site team did not accumulate radiation during the visit, and that frisker levels were below background. The Ludlum model 19 microR meter is a gamma ray meter that measures radioactivity. Results from this survey indicate that waste rock materials at locations shown in Table A are at or near site background or 90 microRems per hour (pr /hr). The only exception was at the IC -10370 drilling location. Though this location was above the background level, the exposure rate was 165 pr /hr or an activity of 66 picoCuries per gram (pCi /g) (Schiager, 1974). The OSHA whole body 1 hour dose is 430 pr /hr. Environments with gamma radiation higher than 25% of 430 pr /hr (108.5 pr /hr) are considered a `radiation area" under the US Code of Federal Regulations (CFR) 1910.1096 part b. Pitch Reclamation Project - Piezometer Replacement Field Activities Report g:laprojed\banick 0000102.0001 pitch reclamation projec0ao102, hanick- pdch\piezo replacement reporting \ draft Var _pdch_piezo_replacement_pdd.doc 3