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<br /> <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 | Robert W. Randall, Executive Director | Virginia Brannon, Director <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />Re: Colowyo Coal Mine (Permit No. C-1981-019) <br /> Technical Revision No. 125 (TR-125) <br /> Adequacy Review <br /> <br />Dear Mr. Tennyson: <br /> <br />TR-125 seeks to address the requirements of Stipulation 7, as stated in the cover letter submitted with the <br />application. Stipulation 7 was added to the permit on May 4, 2007 as part of the permitting process of PR- <br />02, and reads: <br /> <br />THE COLOWYO COAL COMPANY SHALL SUBMIT A TECHNICAL REVISION TO THE <br />DIVISION WHICH PROVIDES AN ANALYSIS OF GROUNDWATER POINTS OF COMPLIANCE <br />AT THE COLOWYO MINE PURSUANT TO RULE 4.05.13(1). THIS ANALYSIS WILL BE DONE <br />IN CONSULTATION WITH THE DIVISION AND WILL INCLUDE A WRITTEN <br />DETERMINATION OF THE NEED FOR GROUNDWATER POINTS OF COMPLIANCE AT THE <br />MINE. IF DEEMED APPROPRIATE, BASED ON THIS ANALYSIS, COLOWYO SHALL <br />ESTABLISH ONE OR MORE POINTS OF COMPLIANCE FOR THE COLOWYO MINE. <br /> <br />After reviewing TR-125 from Colowyo for the Colowyo Mine (the Mine), the Division has the following <br />comments: <br /> <br />1. To date, monitoring data at the Mine shows that TDS is generally well below 10,000 mg/L and <br />due to the fact that site specific standards have not been adopted by WQCC, the applicable water <br />quality standard for groundwater at the Mine is the Interim Narrative Standard. This remains <br />consistent with the Division’s second adequacy review letter dated March 26, 2007 of the Mine’s <br />PR-02 application, of which Stipulation 7 was attached. <br /> <br />Given Colowyo and the Division’s acknowledged potential for negative impacts to alluvial <br />groundwater quality from operations at the Mine, the rules require that points of compliance be <br />established. After further review and given the current operations at the Mine, the Division <br />recommends the use of the existing monitoring wells; Gossard Well, MT-95-02 and the North <br />Good Spring Well as points of compliance and would satisfy Rule 4.05.13(1)(b). Based upon the <br />Division’s comments above, please provide the Division updated text and maps as necessary <br />to included points of compliance to satisfy Rule 4.05.13. <br /> <br />For additional information and the Division’s rational, please refer the interoffice memo. <br />November 6, 2018 <br /> <br />Tony Tennyson <br />Colowyo Coal Company L.P. <br />5731 State Highway 13 <br />Meeker, CO 81641 <br /> <br />