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TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. <br /> HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233-0695 303-452-6111 <br /> March 7, 2019 <br /> Mr. Zach Trujillo <br /> Environmental Protection Specialist <br /> Colorado Division of Reclamation, Mining & Safety <br /> Department of Natural Resources <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> RE: Colowyo Coal Company L.P. R EIVED <br /> Permit No. C-1981-019 MAR 11 2019 <br /> Technical Revision No. 125 <br /> Adequacy Response DIVISION OF RECLAMATION <br /> MINING AND SAFETY <br /> Dear Mr. Trujillo, <br /> Tri-State Generation and Transmission Association Inc. (Tri-State), is the parent <br /> company to Axial Basin Coal Company, which is the general partner to Colowyo Coal Company <br /> L.P. (Colowyo). Tri-State received your adequacy letter dated November 6, 2018 and is <br /> providing the response below to your adequacy concern on behalf of Colowyo. The Colowyo <br /> Mine operates under Permit No. C-1981-019. <br /> 1. To date, monitoring data at the Mine shows that TDS is generally well below 10,000 <br /> mg1L and due to the fact that site specific standards have not been adopted by WQCC, <br /> the applicable water quality standard for groundwater at the Mine is the Interim <br /> Narrative Standard. This remains consistent with the Division's second adequacy review <br /> letter dated March 26, 2007 of the Mine's PR-02 application, of which Stipulation 7 was <br /> attached. <br /> Given Colowyo and the Division's acknowledged potential for negative impacts to <br /> alluvial groundwater qualityfrom operations at the Mine, the rules require that points of <br /> compliance be established. After further review and given the current operations at the <br /> Mine, the Division recommends the use of the existing monitoring wells; Gossard Well, <br /> MT-95-02 and the North Good Spring Well as points of compliance and would satisfy <br /> Rule 4.05.13(1)(b). Based upon the Division's comments above,please provide the <br /> Division updated text and maps as necessary to included points of compliance to satisfy <br /> Rule 4.05.13. <br /> For additional information and the Division's rational,please refer the interoffice memo. <br /> Response: The Division's response focuses on only a very small part of the discussion in the <br /> proposed Exhibit 7 Item 16 submittal materials and does not consider other information provided <br /> in the exhibit, which is relevant to the Regulations of the Colorado Mined Land Reclamation <br /> Board for Coal Mining (1980 et seq.) Rule 4.05.13 requires that this additional information be <br /> taken into consideration. Section (1)(b)(ii) of Rule 4.05.13 reads: <br /> ANGOUALOPPOHTUNIJV AFFIHMAIIVLACIIDNEMPLOVEN CRAIG STATION ESCALANTE STATION NUCLA STATION <br /> PO BOX 1307 PO BOX 577 P.O BOX 698 <br /> A Touchstone Etlergy'Coo lerArlve � � CRAIG.CO 81626.1307 PREWITT,NM 87045 NUCLA,CO 81424-0698 <br /> I l 970-874-4411 505-876-7771 970-864-7316 <br />