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MINE ENGINEERING <br />MINE RECLAMATION <br />April 12, 2013 <br />Brock Bowles <br />Division of Reclamation, Mining & Safety <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Re: <br />North Thompson Creek Mine (Permit No. C- 1981 -025) <br />February 2013 Discharge Monitoring Report, Adequacy Response #1 <br />Dear Mr. Bowles: <br />J. E. STOVER & ASSOCIATES, INC. <br />2352NORTH 7 STREEET, UNIT B <br />GRAND JUNCTION, COLORADO 81501 <br />PHONE: (970) 245 -4101, FAX 242 -7908 <br />CIVIL ENGINEERING <br />CONST. MANAGEMENT <br />The DRMS' letter dated March 29, 2013 requested additional information. On behalf of <br />MINREC Inc., enclosed is the requested data. <br />1. DRMS: The discharge water maximum weekly average temperature (MWAT) was <br />reported as 2.2 ° C. During the February 2013 inspection conducted by DRMS, no <br />temperature recording device was observed at the site. Please clarify how the <br />temperature was measured. <br />MIN: The temperature was measured in the field using a hand held temperature <br />measuring device. <br />2. DRMS: The discharge flow was reported as 34 million gallons per day (Mgal /d). <br />During the February 2013 inspection conducted by DRMS, no flow meter or recording <br />device was observed at the site. The reported flow seems excessively high. Please <br />clarify how the flow was measured. <br />MIN: The flow was measured in the field by timing the flow into a five gallon bucket. <br />The flow on page 3 of the DMR has been revised and resubmitted. For convenience, <br />revised page 3 is attached. <br />Sincerely, <br />Tamme Bishop, P.E. <br />Project Engineer <br />Cc: MINREC, Inc. <br />