2015-01-16_PERMIT FILE - M2015001 (2)

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GEOTECHNICAL EVALUATION CROSSFIRE BONDS GRAVEL PIT BONDAD,COLORADO JOB NO. 3124JS057 1.0 PURPOSE This report contains the results of our geotechnical evaluation for the development of a gravel pit in Bondad, Colorado. The purpose of these services is to provide information and discussion regarding: • the potential impact of geologic hazards on the proposed improvements and development area • the potential impact of mining or reclamation operations on geologic hazards within or in the vicinity of the development area • evaluation of maximum allowable slope heights and angles for short-term and long-term conditions for cut and fill operations that may occur on the project site, and the potential impact of the slopes on nearby improvements • recommendations for reducing potential for off-site impacts due to mining operations The results of the field exploration and the field and laboratory testing programs are presented in the Appendices. 2.0 PROJECT DESCRIPTION The development is located on the west side of County Road 213, near the intersection of County Road 213 and Highway 550. The location of the proposed gravel pit is shown on the attached Site Location Map (Figure 1). The limits of the proposed gravel pit area are shown on the attached Site Plan (Figure 2). The project is currently in its preliminary design stage and therefore details regarding the anticipated excavation depths, stockpile locations, and proposed improvements were not available. It is understood that the clay overburden will be removed to expose the underlying granular deposits (sand, gravel, cobbles and boulders), and stockpiled on-site for future use as backfill. The granular deposits will be mined, processed on-site, and transported for use off-site. The excavations to mine the granular deposits are expected to extend to the top of the sandstone bedrock. The mined area will then be reclaimed by backfilling the excavations created by mining operations with the clay overburden. 1