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�' n <br /> Transit Mix Concrete Co. <br /> d. Best Management Practices for Sediment Control <br /> In addition to the primary water management structures, secondary sediment control measures <br /> should be installed to reduce water and sediment loads on the primary basins. <br /> Best Management Practices (BMPs)for sediment control are standard practices on construction <br /> sites. Unlike the primary water management structures which are designed to remove silt-sized <br /> particles from the runoff, BMPs are most effective for settling out fine sand and coarser material. <br /> Some examples of BMP sediment barriers include: <br /> • Sediment barriers (bales, silt fences, and earthen berms), and <br /> • Check structures. <br /> Sediment barriers are placed below affected areas subject to sheet and rill erosion, below the <br /> toes of exposed and erodible slopes, and along the toes of streams and channel banks. Check <br /> structures are small temporary structures constructed across a swale, gully, or small drainage <br /> to reduce gully erosion until stabilization occurs. The check structures reduce flow velocities <br /> and trap and store larger-size sediment. <br /> Maintenance of sediment deposited in the existing basins is another best management practice. <br /> Sediment levels should be examined annually following the highest runoff season (i.e. summer), <br /> and sediment removal should be undertaken in the fall to prepare the sediment basin for the <br /> next rainy season. This is a critical element of the successful operation of the water management <br /> plan. <br /> For effective use of BMPs, regular inspection and maintenance of the structures must occur. <br /> Specific BMP layouts will be required as part of the detailed drainage design. <br /> e. Water Usage <br /> Water needs for the operation include dust control on the roads and in the crushing and screening <br /> process. Water will be recycled whenever practical. The water usage plan minimizes by <br /> preventing impacts to downstream water rights holders, and the sediment basin outlet works <br /> similarly minimize and prevent impacts to water quality. The primary source of water for use in <br /> mining operations on the site will likely be via purchase from Colorado Springs Utilities with water <br /> hauled from Colorado Springs and stored on site. <br /> No water is needed for irrigation as no irrigation will be used in the revegetation program. The <br /> revegetation program is designed to function and develop under natural precipitation levels. <br /> Some manual augmentation methods may be used for tree plantings. <br /> Hitch Rack Ranch Quarry Permit Application <br /> October 3, 2017 G-26 <br />