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COLORADO <br /> Division of Reclamation, <br /> Mining and Safety <br /> Depa,trnent of Natural Resource <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> August 10, 2016 <br /> Connie Davis <br /> Aggregate Industries <br /> 1687 Cole Blvd., Suite 300 <br /> Golden, CO 80401 <br /> RE: Lyons Quarry; DRMS File No. M-1977-141; Technical Revision No. 2 —Adequacy <br /> Review No. 1 <br /> Dear Ms. Davis, <br /> The Division of Reclamation, Mining and Safety(Division) received Technical Revision - 2 <br /> (TR-02) for the above referenced site on July 1, 2016 and the Technical Revision was filed for <br /> review on July 1, 2016. The decision date for this Technical Revision is September 29, 2016. <br /> The Division has reviewed the proposed revisions and has the following comments: <br /> Agency Comments <br /> 1. The Division received comments from Boulder County Parks and Open Space. Please review <br /> the attached comments and explain how the Operator intends to address the concerns <br /> expressed by Boulder County Parks and Open Space. <br /> Blasting Plan <br /> 2. The revised reclamation plan calls for establishing the final grade through drilling and <br /> blasting. Pursuant to Rule 6.4.4(i), the Operator must demonstrate that offsite areas will not <br /> be adversely impacted by blasting. Please provide a commitement to conduct seismic <br /> monitoring for each blasting event and specify the location of all seismic instruments. <br /> 3. Please provide the Division with a plan to control flyrock from damaging nearby permanent <br /> man-made structures. <br /> 4. Please commit to conducting a pre-blast survey of all permanent man-made structures which <br /> have the potential to be impacted by blasting operations. <br /> 5. Please provide the Division with the proposed maximum peak particle velocities in <br /> inches/second based on the distance from the blast stie to all structures within one mile of the <br /> blast location. <br /> of -C <br /> y O� <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br /> John W. Hickenlooper, Governor I Robert W. Randall, Executive Director I Virginia Brannon, Director �876 i <br />