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OXBOW MINING, LLG '� <br />I�1 <br />3737 Hw 133 P.O. Box 535 Somerset, Colorado 81434 USA Tel (970)929-5122 Fax <br />(970)9-A'209-5177 <br />Februar 24, 20 10 <br />Mr. Mike Boula <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Minin and Safet <br />10 1 South 3", Suite 3 01 <br />Grand Junction, Co. 81501 <br />Re: Re§p to Febru 22, 20 10- PAR <br />TR-66 Application for Borehole Sealin Modification <br />Oxbow Minimp, LL C, Permit No. C- 1981-022 <br />Dear Mr. Boula <br />The purpose of this letter is to respond to the Preliminar Ade Review, dated Februar 22, <br />20 10 for our Technical Revision No. 66 to the Oxbow Minin LL C (0MLLQ Permit No. C- <br />1981-022, <br />Ade Items. <br />Item 4 1. PAP pa 2.05-69a has been modified to reference PAP Section 2.04.6 - Geolo <br />Description and Section 2. 04.7 — H Description. Oxbow has demonstrated in these <br />sections the lack of an a or acid or toxic producin materials in the coal bearin <br />fomiations where the g ob vent boreholes are completed. <br />Item #2. Please see i tem #I above. <br />Item #3. Oxbow has modified the PAP pa 2.05-69b to provide for a 50' cement plu to <br />seal the steel cased borehole. Oxbow reco that subsidence effects with lon miffl"n is <br />unceftain with respect to the abilit of surroundin g eolo g ic strata to prevent methane mi <br />but the proposed 50'cement plu located Within the borehole will prevent methane mi <br />from the borehole. <br />Item 94. Oxbow has no plans to construct g ob vent boreholes M* alluvial/colluvial water <br />bearin zones. Oxbow is confident the 5,0 cement plu will prevent potential methane rm* rata on <br />from the cased borebole to surroundin strata. <br />0 Pa I <br />