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-' "~' 2 <br />In 1978, our predecessor, the Soil Conservation Service, frequently recommended the inclusion <br />ofcresfed wheatgrass in reclamation grass mixtures. Through field research conducted in the <br />imervening 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 />are based on MRCS "critical area" seeding rates that are double our normal rates. <br />Table A <br />We recommend mulching re-vegetated areas with clean weed-free straw or native hay. It should <br />be applied at a rate of4,DD0 pounds per acre and crimped into the soil to anchor iY. Crimpiag <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 caa be obtained through local county extension <br />service offices. All surface water should be diverted away from the ro-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 aeeas will need to be controlled by mowing or herbicide application <br />urtil grasses are established, usually the first four yeazs 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 area, is concerned about the <br />overall loss ofwater 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 ofaa impermeable liner is the existing sand and gravel pits prior to <br />Common Name 100°~ <br />PLS/Acre °~ in Mix Total LBS of <br />PLS needed <br />er acre <br />Sand Bluestem 16.0 15 2.4 <br />Sideoats Tama 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 />Pu le rairie clover 6.0 5 0.3 <br />Fourwin saltbush 1.0 5 0.1 <br />Wintertat 1.0 5 0.1 <br />Prairie coneflower 6.0 2 0.1 <br />Scarlet iobemallow 6.0 2 0.1 <br />Total 100°~ 8.8 <br />Note: if seed is broadcast, recommended rate should be doubled. <br />