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COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Interoffice Memorandum <br />March 11, 2016 <br />To: Jason Musick <br />From: Tabetha Lynch <br />RE: Bowie No. 2 Mine (Permit No. C-1996-083) <br />TR -99, adequacy review #2 <br />This memo is a review of the Bowie No. 2 Mine Technical Revision #99, Revise Hydrologic <br />Monitoring Program Adequacy Response #1, submitted to the Division on 8 February 2016. This <br />revision was submitted by Bowie to address Division concerns relative to point of compliance <br />monitoring wells and to incorporate changes resulting from the 2014 monitoring well <br />rehabilitation project. <br />Second adequacy review items are italicized below. <br />First Adequacy Review Discussion: <br />This review took into account materials provided by Bowie in TR -99 as well as the findings of <br />previous revisions submitted to the Division in relation to the Monitoring Program at the mine. <br />Interoffice memoranda related to previous relevant Permit Revisions provide a narrative as to <br />the development of the groundwater monitoring program at the Bowie 2 mine. <br />Briefly, as summarized in the PR -14 groundwater review: <br />The HydroGeo report of September 2008, which was incorporated into Volume III, <br />Exhibit 3 of the PAP with the approval of PR -10, analyzed water quality data from the B - <br />seam and from the strata above the B -seam. Although there remain concerns with both <br />the quality and quantity of data on which the analysis was based - which were <br />acknowledged in the report - the Division accepted the conclusions of the report that: (i) <br />the data show little North-South variation in water quality within the permit area; and <br />(ii) there is no reason to expect the water quality to change beyond the permit <br />boundary to the North. <br />With the approval of PR -11 the Division accepted the demonstration of the hydrologic <br />separation of the Rollins Sandstone from the effects of mining operations and, as a <br />result, concluded that BRL would not be obliged to install deep down -gradient wells to <br />monitor this member. <br />QF GQ�Q <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br />John W. Hickenlooper, Governor I Mike King, Executive Director I Virginia Brannon, Director * * 1g76 <br />