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COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />February 17, 2021 <br />Tony Tennyson <br />Colowyo Coal Company L.P. <br />5731 State Highway 13 <br />Meeker, CO 81641 <br />Re: Colowyo Coal Mine (Permit No. C-1981-019) <br />Technical Revision No.145 (TR-145) <br />Second Adequacy Review <br />Dear Mr. Tennyson: <br />After reviewing from Coal Company L.P. (Colowyo) Reponses to the Divisions original adequacy letter <br />regarding TR-145, the Division has the following comments: <br />1. No additional response required. <br />Volume 2D <br />2. No additional response required. <br />3. When reviewing the Streeter Pond figures: <br />a. Comparing the proposed Streeter Pond As -Built drawing (Figure Exh. 7-14SP-1) to the <br />currently approved drawing (Exhibit 7-SP, Attachment 4), the stage/storage curve is the <br />same but the table with Storage Volume Computations has changed significantly. Please <br />explain this apparent discrepancy (the Division acknowledges that the graph and table <br />match in the proposed drawing). <br />The currently approved version of the Streeter Pond As -built does not contain a storage volume <br />computation table, so it is unclear on what the Division is reviewing. As stated by the Division, <br />Figure Exh. 7-14SP-I as submitted under TR-145, the stage storage curve and storage volume <br />computations table do match; therefore, no explanation is necessary. Further, please see <br />response to comment 4. e. below. <br />It has come to the Division's attention that it has been reviewing page 8 in the file in <br />Laserfiche that is dated 9/9/2015, has the Doc Name "Attachment 1 to Attachment 12," and <br />the Section_ Exhibit Name "Exhibit 07 Streeter Pond 001A." This document was replaced <br />by the Colowyo TR-135 however was maintained to preserve the Streeter Pond As -Built <br />located within. This As -Built drawing has the Storage Volume Calculations being referred <br />to. With the addition of the provided newly proposed as -built for the Streeter Pond <br />included in the Colowyo TR-145, this referenced document will be removed. No additional <br />response is required. <br />OF COlO <br />n O <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us * * <br />Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director * 1876 * <br />