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Million Gallon Water Tank Geotechnical Investigations (MR10 -12 <br />Site geotechnical investigations are required to support evaluation, design, and possible <br />future construction, operation, maintenance, and reclamation of a million gallon water tank to <br />supply water to the mine. Two sites are being investigated to determine suitability of the <br />bedrock. A total of twelve (12) holes will be drilled with six (6) being drilled at each site <br />option. If the bedrock at the first site is found to be appropriate for the tank, the other six (6) <br />holes will not be drilled. Appropriate cultural resources surveys for the proposed <br />geotechnical investigations have been completed and can be found on Map 2. Effects to <br />grouse habitat will be mitigated through the Wildlife Mitigation Plan developed in <br />conjunction with the Colorado Division of Parks and Wildlife. <br />The site geotechnical investigations will provide foundation and soils information for <br />evaluation and design of the million gallon tank and pump station. Site geotechnical <br />investigations for the proposed tank will involve completion of 12 shallow (approximately <br />10 -30 foot deep) geotechnical test holes around the possible tank sites. All 12 holes will be <br />within the PSCM permit area. <br />An all- terrain drill rig will be used to complete 4 -inch hollow -stem auger sample holes to <br />characterize foundation materials, assess depth to bedrock and groundwater conditions, and <br />to collect material samples for lab testing. All auger -holes will be backfilled with cuttings, <br />leveled, and hand - seeded with the approved rangeland seed mixture, on completion of <br />drilling and sampling. <br />MR10 -12 2.05.3 -E5 - 2 06/12 <br />