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5) Powertech will comply with DRMS rules and regulations related to the sampling of mud pits that <br />are used for drilling activities. <br />These rules and regulations state: <br />• The concentration of radium-226 or radium-228 in soil may not exceed the background <br />level by more than 5 picocuries per gram (pCi/g) or 0.185 becquerels per gram (8q1g), <br />averaged over the first 15 centimeters (cm) of soil below the surface; and <br />• The concentration of natural uranium in soil, with no radioactive decay products present <br />may not exceed the background level by more than 30 pCi/g or 1.11 Bq/g, averaged over <br />the top 15 cm of soil below the surface, and 150 pCi/g or 5.55 Bq/g, average <br />concentration at depths greater than 15 cm below the surface, so that no individual <br />member of the public will receive an effective dose equivalent in excess of 100 mrem per <br />year or 1 millisievert (mSv) per year. <br />The DRMS will require test results demonstrating that these limits have not been exceeded; the <br />tests are to be conducted during or immediately following the reclamation of the mud pits. If <br />these limits are exceeded, DRMS may require appropriate off site disposal of mud pit contents. <br />if you have any questions or require additional information, please contact us at 303-790-7528. <br />Sincerely Yours, <br />Richard E. Blubaugh <br />Vice President-Environmental Health & Safety Resources <br />enclosure(s) <br />cc: Terry Walsh, Jim Bonner, Michael Beshore