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GCC <br />GCC Energy, LLC <br />Energy Telephone: 970.385.4528 6473 County Road 120 <br />"Safety as a Value" Facsimile: 970.385.4638 Hesperus, CO 81326 <br />May 10, 2019 <br />State of Colorado <br />Division of Reclamation, Mining & Safety <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Attn: Rob Zuber, Environmental Protection Specialist II <br />Re: GCC Energy, LLC, King II Mine <br />CDRMS Permit # C-1981-035 <br />Minor Revision No. 48 (MR -48) Initial Submittal <br />• Add Elevated TOC Evaluation Work Plan <br />Mr. Zuber: <br />Please find attached Minor Revision MR -48, "Add Elevated TOC Evaluation Work <br />Plan". <br />GCC Energy (GCC) maintains a network of hydrologic monitoring sites, including <br />monitoring wells, for compliance monitoring at the King II mine. Each site is subject <br />to monthly monitoring of water quantity and quality, which includes quarterly water <br />quality laboratory analysis for an established and permitted analytical suite, to <br />document baseline conditions over the course of the first year (four quarters) of <br />monitoring. Subsequent to the initial four quarters of baseline monitoring, data is <br />interpreted to determine baseline conditions and address the adequacy of monitoring. <br />This includes identification of outlier data when compared to the collective body of <br />GCC hydrologic data by type: surface water, groundwater or spring/seep. <br />Section 2.05.6 has been revised to include a work plan in the event that outlier data is <br />encountered in the course of normal water sampling. Current section 2.05.6 pages 11 <br />thru 13 have been reformatted, and their page numbers have been updated, to allow <br />for logical placement in the PAP of the aforementioned work plan. <br />