2015-02-24_REVISION - M1974086 (9)

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Changes in the permit boundary of an operation are appropriate as part of an amendment application. 3. The map labeled `C -2: 2010 Conditions' depicts water at the bottom of the quarry. Please specify if the pit currently contains water and identify the source of this water, e.g. groundwater or surface runoff. Also, demonstrate the operation is in compliance with all applicable Colorado water laws and regulations governing injury to existing water rights. Exposure of groundwater requires, at a minimum, a well permit and substitute water supply plan. Stormwater that is captured by the pit must infiltrate into the ground or be released to the stream system within 72 hours. Otherwise, the Operator is responsible for replacement of evaporative depletions. The water shown in the bottom of the quarry on Map C -2 is merely stormwater captured in the quarry at the time of the survey in 2010. Map C -2 has been revised with a note showing this. All stormwater captured at the Ralston Quarry is either discharged through the sediment pond system, or evaporates /infiltrates within 72 hours. No ground water exposure is part of the Ralston Quarry operations. 4. The map labeled `C -2: 2010 Conditions' depicts several buildings immediately to the west of the processing area located at the southwest corner of the site. Are these structures associated with the quarry operation? The structures west of the permit boundary's southwest corner are owned by Asphalt Paving Co., but are not part of the quarry operations. 5. The map labeled `C -4: Cross Sections' states the vegetation islands will be planted with rangeland shrubs. However, the seed mix provided as part of the Reclamation Plan does not include shrub species. Please clarify if shrubs will be planted on the vegetation islands. If shrubs are to be planted, then specify the species and seeding or transplant rate. If shrubs will not be planted on the vegetation islands, then revise the Reclamation Plan Map accordingly. Shrubs have been removed from Map C -4, they are not part of the proposed reclamation plan. 6. The map labeled `C -4: Cross Sections, Detail B - Eastern Slope Information' states that drilling and blasting will create benches on the eastern slope. However, the Mining Plan states a continuous slope of 650 would be excavated on the east side. Please clarify if the final grade will be one continuous slope or if the final grade will be achieved through benching and revise the map or Mining Plan accordingly. The mining plan on page D -1 has been corrected to remove the reference to the 65° slope. The east slope of the quarry will be established to a continuous final slope. Map C -4 and the Geotechnical Stability Exhibit discuss the maximum allowed configuration.