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Other Permits and Licenses - Archaeological and Historic Preservation <br />23. Is clearance from the State Historic Preservation Officer regarding properties of <br />historical significance including the need for an archaeological survey, necessary <br />to conduct the proposed operation? (Rule 6.4.13) <br />The applicant arranged for consultants to conduct an archaeological survey of <br />the plant site and mine site areas. The resulting reports have been reviewed by <br />the DMG and found to adequately address concerns regarding archaeological <br />resources of the site. These reports comply with the requirements of Rule <br />6.4.13. In addition, the applicant has received a letter of concurrence from the <br />Colorado Historical Society with respect to the conclusions reached in the <br />reports. <br />Blasting <br />24. Has the applicant demonstrated that blasting will not damage off-site structures, <br />including the 1886 Adobe house and registered water wells? (Rules 6.4.19 and <br />6.5) <br />STRUCTURES <br />The applicant has addressed the proposed blasting plan in accordance with <br />Rule 6.5(4). The quantity of explosives to be detonated in each "8ms delay" <br />period is consistent with accepted blasting practice and according to "the scaled <br />distance formula ", yields peak particle acceleration at the proposed cement <br />plant (1,500 feet away from the mine) under that allowed by the State of <br />Colorado Department of Labor. The nearest residence is located in excess of <br />4,000 feet away. The 4,000 foot separation yields a safetyfactor in the scaled <br />distance formula of approximately 3.8, and solving for peak particle velocity <br />yields a safetyfactor of 8.7. An acceptable safetyfactor for these values would <br />be in the range of l.2 to 1.5. Therefore, the proposed explosive use is well <br />within the range required by the DMG. <br />WELLS <br />The nearest permitted well is located at the Blake Ranch, approximately 4,000 <br />feet away. The above explanation also applies to the well. <br />25. Has the applicant considered potential blasting impacts to Dakota and Cheyenne <br />aquifers? (Rule 6.5(4)) <br />The applicant noted that, "experimental data for limits of the crushed and <br />fractured zone distances are given for a variety of rock and explosive strengths <br />(Siskind and Fumanti, 1974). The crushed zone ranges from 2 to 4 borehole <br />radii away from the center of the borehole ( 5 to I foot in this instance), while <br />the fracture zone averages 20 borehole radii away and extends to 50 radii