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6.4.4 Exhibit D — Mining Plan <br />7. The Applicant has stated the permit boundary will be marked. Please note that Rule <br />3.1.12(2)(b) requires the Operator to delineate the boundary of the affected area, which <br />would be 210 acres of the total 271.61 acres permitted at the Ralston Quarry. <br />For the purposes of this application, the affected area and the permit area are the same. While <br />Asphalt Paving Co. may not disturb all of the permit area during operations, it reserves the right <br />to disturb anywhere within the permit area as needed. The DRMS bond will reflect this. <br />8. The Applicant has stated that concrete and asphalt may be recycled through the on- <br />site plants. Please clarify if all of the recycled material will leave the site as product or if <br />some will remain on -site to be used as backfill material. <br />All recycled asphalt and concrete will be used in the production of construction materials that are <br />then used off site. No recycled asphalt or concrete will be used as backfill. <br />9. The Mining Plan calls for maintaining a vertical distance of no less than 40 ft. <br />between the pit floor and the Denver Water Tunnel. Please specify the horizontal distance <br />between the Denver Water Tunnel and the open pit to the south of the tunnel. <br />Map C -4 has been revised to show that mining will stay at least 40' away from the water tunnel <br />both horizontally and vertically. <br />10. The Applicant has stated that security fencing and wildlife fencing will be installed <br />upon the completion of the reservoir. The cost for installing fencing must be included in the <br />bond calculation. Please provide the following additional information regarding the <br />fencing: <br />a) Type(s) of fencing to be installed, e.g. chainlink, three strand, etc. <br />b) Dimensions for each type of fencing (length and height). <br />Asphalt Paving Co. will install a four -strand barbed wire fence on the three sides adjacent to the <br />City of Denver property: northwest, north, and east. A six foot chain link fence will be installed <br />on the South side, and a portion of the south end of the west side. The cost of said fencing has <br />been determined based on a contractor quote. Please see the revised Exhibit L. <br />11. The Mining Plan map illustrates the contact zone between the basalt and the <br />underlying shale. Please specify if shale will be exposed along any point of the western <br />quarry wall. <br />Generally the mining avoids exposing the shale. However, the shale contact is irregular in <br />isolated areas where mining does expose the shale from time to time. <br />