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-,e,?.0000 <br />0.0 0.0-0-0 <br />OXBOW MINING, LLC <br />3737 Hwy 133 P.O. Box 535 Somerset, Colorado 81434 USA Tel (970)929-5122 Fax <br />(970)929-5177 <br />April 27, 2009 <br />VtECEjVE® <br />Mr. Joe Dudash APR 3 0 20n <br />Environmental Protection Specialist aton, <br />Colorado Division of Reclamation, Mining and bafeW 1) rtecSafety <br />1313 Sherman Street, Room 215 M;n,ng and <br />Denver, CO 80203 <br />Re: 2007 Annual Hydrology Report <br />CDRMS Permit C-1981-022 Oxbow Mining,_LLC <br />Response to March 9, 2009 Adequacy Review <br />Dear Mr. Dudash: <br />Oxbow is in receipt of the cited 2007 AHR Adequacy Review dated March 9, 2009. We <br />appreciate the Division's comments and review of the AHR to insure we have a quality product. <br />Due to the timing of the comments, the responses will largely be addressed by the submittal of <br />the 2008 AHR which was currently in the midst of preparation. The overall AHR database <br />includes the data, queries, tables and charts and was updated for the preparation of the 2008 <br />AHR and included the Division's recommendations. <br />Comment 1 - SAR is a calculation based upon NA, MG and Ca. We have removed the <br />reference to SAR in the 2008 SAR. <br />Comment 2 - The 2008 AHR has been modified to reference the two North Fork sites. <br />Comment 3 - Oil and grease observations have been added to the 2008 AHR. <br />Comment 4 - The 2008 AHR has been modified to include reference to dissolved oxygen for <br />streams. <br />Comment 5 - The 2008 AHR reflects the removal of well B-6 and EC-7. <br />Comment 6 - Note 2 of the 2008 AHR page 5 and future AHRs will reflect the full 41' quarter <br />laboratory analysis for NF-1 and NF-3. Lack of such analysis was an oversite and will be <br />reflected in future AHRs. <br />0 Page 1