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Environmental Assessment <br /> Design Feature lb: Dust from truck traffic <br /> Dust generated by coal truck traffic is minimized through a variety of measures including applying water <br /> and magnesium chloride solution to unpaved road surfaces,reducing truck speeds on unpaved surfaces, <br /> and covering coal loads to eliminate blown coal dust. Some of the specific measures that GCC has <br /> committed to as part of their LUP include: <br /> ■ Temporary paving of approximately 1 mile from 2541 to 3230 CR 120 was completed in June <br /> 2016 (Phase 1). <br /> ■ Until such time the entirety of north CR 120 between SH 140 and the King II Coal Mine is paved, <br /> GCC shall treat unpaved sections of north CR 120 with dust retardant such as water and/or <br /> magnesium chloride as determined by the LPC Public Works Director. <br /> ■ Until such time that the entirety of north CR 120 between SH 140 and the King II Coal Mine is <br /> paved, GCC shall ensure trucks hauling coal from King II Coal Mine do not cause dust that rises <br /> any higher than a coal truck's wheels to be visually observed. <br /> ■ GCC shall ensure that all coal trucks hauling coal from the King II Coal Mine cover their loads <br /> prior to leaving the mine site. <br /> Design Feature 2: Groundwater Quality <br /> To verify baseline conditions and monitor that the King II Mine is not adversely affecting the water wells <br /> of adjacent landowners, GCC has completed the following measures: <br /> ■ GCC has installed four monitoring well clusters (Technical Revision 426). Refer to Map A-8 for <br /> the locations of the monitoring well clusters. Each monitoring well cluster includes one well <br /> completed above the Menefee Formation"A"coal seam, one well completed in the "A" coal <br /> seam, and one well completed in the lower Menefee Formation below the "A" coal seam where <br /> groundwater is encountered. These clusters are located upgradient and downgradient of the King <br /> II Mine. They will be used to meet monitoring and data requirements for LPC, CDRMS, and the <br /> OSMRE related to groundwater quality and hydrologic balance. Data from these monitoring <br /> wells will also be used to support updates to the Cumulative Hydrologic Impact Assessment <br /> (CHIA) and Probable Hydrologic Consequences (PHC)for the King 11 Mine permit. <br /> ■ GCC has committed to replacing the existing underground water storage with aboveground water <br /> storage as part of its supplemental water supply plan. Closure of the underground water storage <br /> will further eliminate risk to groundwater and be reclaimed or recovered per requirements <br /> specified by CDRMS and the OSMRE as part of the associated mine permit. <br /> Design Feature 3: Subsidence <br /> Compliance by GCC with CDRMS Regulation 2.03.7(3), Relationship to Areas Designated Unsuitable <br /> for Mining, addresses risk of subsidence from underground mining to adjacent surface property.While <br /> this is not a typical design feature, it is highlighted here to directly address scoping issues raised by <br /> adjacent landowners. The regulation restricts mining to an area outside 300 feet of an occupied dwelling. <br /> Furthermore, OSMRE and CDRMS typically requires that"angle-of-draw"be considered in determining <br /> a distance where mining is not permitted. Angle-of-draw accounts for the possibility that the effects of <br /> DOI-B LM-CO-S010-2011-0074-EA <br /> September 2017 <br /> -45- <br />