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likely to be practical from a geotechnical perspective. Less aggressive configurations (i.e., ones with shallower mine slope angles) are possible. Operational considerations, rock quality, slope stability, and visual impacts will all influence the actual buildout for any phase which may necessarily be less extensive than the geometries shown, However, in no case will the limits of mining be outside the limits shown. Brief summaries of activities during each phase are as follows: A. Phase I Phase I develops the Central Quarry to its final buildout configuration down to approximately EI 6360 ft in preparation for the temporary Central Quarry Reservoir, and it expands the North Quarry immediately north of the existing process facilities resulting in a platform at approximately EI.6,455 ft. The Central Quarry and the North Quarry will continue to be developed simultaneously during Phase I resulting in the end highwall and bench configuration shown in Figure D-], Exhibit D- Phase i Mining Plan Map. It is anticipated that the bench at EI. 6,455 ft in the North Quarry and the pad at El. 6,490 ft north of the Central Quarry Reservoir will be utilized as an expansion of the present process and stockpile areas, and still including the possible installation of concrete and/or asphalt batch plants as described in the approved Amendment No. 4. B. Phase II Phase II develops the North Quany to its final buildout configuration down to approximately El. 5,770 ft in preparation for the North Quarry Reservoir, and opens the South Quarry to future development. The proposed new Phase R configuration is shown in Figure D-2, Exhibit D -Phase II Mining Plan Map. Development and reclamation will be coordinated and at times will proceed concurrently in different areas to open up limited land at any given time, to reduce potential visual impacts, and for operational considerations. Existing highwalls in the southwest comer of the North Quarry will be covered with an engineered fill slope. Additionally, land in the northwest comer of the North Quarry will not be mined as extensively as previously planned to improve visual appearance. Also to improve visual appearance, the upper benches will be limited in height to 40 ft with benches 40 to 80 ft wide. These configurations will allow for reclamation fills to extend higher up the rock highwalls visible to viewers of the Front Range vista from the east. Note [hat interim visual impacts will also be minimized by maintaining a natural ground ridge at EI. 6,455 ft along the east edge of the Noah Quarry until reclamation higher and to the west is completed. In addition to North Quarry development Phase II opens up the South Quarry for future development. This is generally accomplished by extending the Central Quarry farther to the south. c:waoiFrrs-nzmm'n~rrxn.+MFxoos.rxr IV - 2