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-~ "'~' 2 <br />In 1978, our predecessor, the Soil Conservation Service, frequently recommended the inclusion <br />of crested wheatgrass in reclamation grass mixtures. Through field research conducted in the <br />intervening years, it has been determined that native grass mixes without crested wheatgrass <br />provide much better field results. The following native grass, wildflower and shrub seed mix <br />and application rates are recommended for re-vegetation in soil types found in the mine area, and <br />aze based on MRCS "critical azea" seeding rates that aze double our normal rates. <br />Table A <br />Common Name 100°k <br />PLS/Acre °k in Mix Total LBS of <br />PLS needed <br />per acre <br />Sand Bluestem 16.0 15 2.4 <br />Sideoats rama 9.0 14 1.3 <br />Prairie sandreed 7.0 15 1.1 <br />Blue rama 3.0 8 0.2 <br />Switch rass 5.0 14 0.7 <br />Western wheat rass 16.0 15 2.4 <br />Pur le prairie clover 6.0 5 0.3 <br />Founving saltbush 1.0 5 0.1 <br />Wintertat 1.0 5 0.1 <br />Prairie coneflower 6.0 2 0.1 <br />Scarlet lobemallow 6.0 2 0.1 <br />Total 100°~ 8.8 <br />Note; If seed is broadcast, recommended rate should be doubled. <br />We recommend mulching re-vegetated azeas with clean weed-free straw or native hay. It should <br />be applied at a rate of 4,000 pounds per acre and crimped into the soil to anchor it. Crimping <br />should be cross slope or on the contour, if possible. The State of Colorado has a list of certified <br />weed-free straw available on the Internet or it can be obtained through local county extension <br />service offices. All surface water should be diverted away from the re-vegetated slopes to a <br />point where it can safely flow down slopes without the potential of serious soil erosion. <br />Weeds in the re-vegetated azeas will need to be controlled by mowing or herbicide application <br />until grasses are established, usually the first four years after planting for native species. If <br />needed, the Colorado State University Cooperative Extension can be contacted for herbicide <br />recommendations and best time for weed control. <br />Surface and Subsurface Water <br />The West Adams Conservation District, along with others in the azea, is concerned about the <br />overall loss of water resources, both surface and subsurface, due to projects such as this. A <br />number of questions should be addressed and resolved for this project. Does the applicant plan <br />to install some form of an impermeable liner in the existing sand and gravel pits prior to <br />