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Fencing internal to the property will be removed as needed to facilitate on site activities. Upon <br /> completion of the reservoir, a combination wildlife fence and security fence will be installed <br /> around the reservoir. Due to the steep slopes and long drop from the crest of said slopes in some <br /> places, wildlife and people will need to be kept out of the reservoir area for their own safety. <br /> The operator commits to clearly marking the permit boundary on site. <br /> The currently existing access road will be maintained throughout the life of the mine and will <br /> remain following reclamation to facilitate access of the reservoir. <br /> Blasting <br /> The basalt is blasted in place using a blasthole drill which sits on a bench created by previous <br /> 3.2 <br /> blasting. The drill creates a series of holes which are then loaded with ammonium nitrate and <br /> fuel oil. Blasting caps and delays are employed to minimize the amount of explosives used. The <br /> holes are generally 5.25 inches in diameter and 38 feet deep. <br /> Seismic measurements are recorded for every shot to ensure that no damage will occur to <br /> surrounding properties and structures. The mine has not had any complaints of blasting damage. <br /> See Appendix 3 for the previous year's blasting reports. <br /> 3.3 <br /> Denver Water Tunnel <br /> As shown on Maps C-1, C-2, C-3 and F, a water tunnel of approximately six feet diameter was <br /> constructed many years ago by the Denver Water Board. This tunnel carries water from a ditch <br /> west of the permit area underneath the permit area to Upper Long Lake Reservoir located east of <br /> the permit area. This tunnel has operated for many years. <br /> The mining plan will avoid this tunnel by maintaining a minimum 40 feet height of existing rock <br /> (basalt) between the bottom of mining in this location and the top of the water tunnel. This <br /> higher elevation will be maintained, as shown on Map C-2. This area from the tunnel to the north <br /> edge of the pit will not be part of the planned water reservoir. <br /> Ralston Quarry t:"g I. k*i and Associates,PI.IA' <br /> January 2019 D-5 <br />