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the Water Quality Control Division of the Colorado Department of Public Health <br /> and Environment. <br /> Response: <br /> Aggregate Industries does have a current discharge permit, COG-500077. <br /> 12. The Reclamation Plan calls for watering the planted grass species. As required <br /> by Rule 6.4.7(3), please indicate the projected amount of water for the project and <br /> identify the source of the water. <br /> Response: <br /> Technical Revision No. 2 is revised to state that the focus of revegetation is native <br /> plant species, adapted to area climate, that require no irrigation. If irrigation is <br /> required, an estimated 0.2 to 0.8 maximum total acre feet is projected to establish <br /> vegetation with the goal of no watering once plants are established. The water <br /> would be pumped from the existing pond at a rate of 40 to 80 gallons per minute, <br /> depending upon the irrigation system setup, season, and weather conditions. <br /> 13. The Applicant is proposing to import 31,460 cubic yards of soil growth medium, <br /> which will cover 39 acres with six inches of topsoil. The current Reclamation Plan <br /> calls for replacing twelve inches of topsoil over the affected area. Please provide a <br /> technical justification for reducing the depth of topsoil/plant growth medium from <br /> twelve to six inches. <br /> Response: <br /> An assessment of site conditions by an HDR soil scientist indicates that parent <br /> material (fine grained sedimentary overburden rock) is sufficiently weathered to <br /> support vegetative growth (as evidenced by the observed vegetation along the <br /> high wall area during a site visit in September 2016). Blending available onsite <br /> material with imported topsoil/plant growth medium will provide additional organic <br /> matter and nutrients to help establish vegetation. The intent of Technical Revision <br /> No. 2 is to develop the majority of the soil growth medium on site and blend only <br /> the necessary imported topsoil/soil growth medium into the top 6 to 12 inches of <br /> onsite subsoil over an area of approximately 39 acres. Technical Revision No. 2 is <br /> revised to include additional discussion of the revegetation plan including test plots <br /> to determine the appropriate blend of onsite and imported topsoil/growth medium <br /> for revegetation. <br /> 6 <br /> hdrinc.com <br /> 1670 Broadway, Suite 3400, Denver, CO 80202-4824 <br /> (303)764-1520 <br />