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<br />Stormwater runoff will flow across the site toward the excavated pit or the detention ponds <br />within the processing azea that will act as settling basins for suspended solids. The excavations <br />will retain runoff from small storm events on-site. <br />Some channelization may need to be added during future mining phases in order to continue <br />collecting all runoff in the mining excavations. The stormwater conveyance improvements will <br />be described in future annual SWMP reports if they are constructed. <br />This site is located in the floodplain of the South Platte River. However, no problems associated <br />with sediment transport through the floodplain are expected to occur. Flood elevations in this <br />area are not expected to be impacted by this operation, as they are currently less than 2 foot deep <br />in a 100-year event. <br />Equipment used for the extraction and hauling of the aggregate will be stored on-site, near the <br />office azea. Daily equipment monitoring and maintenance will occur on-site. Major repair and <br />overhaul activities will be performed off-site. Periodically, a mobile service truck will be <br />brought on site to perform oil changes. <br />3.0 Potential Pollutant Sources/Material Inventory <br />Potential pollutants expected to be stored on-site would include but not be limited to, diesel fuel, <br />gasoline and small amounts of miscellaneous equipment fluids and oils. There will be three <br />diesel fuel tanks with the capacity for 20,000 gallons of fuel. Flocculents may also be used at <br />this site. <br />One pazking azea for both employee vehicles and the mining equipment will be located neaz the <br />office and shop. Additional pazking areas will be located near the asphalt plant, concrete plants <br />and the recycle plant. These areas will be gravel. <br />Haul routes within the site will be gravel or dirt, depending on their location, and can be <br />expected to be a source of potential pollution to stormwater runoff. The access road into the site <br />will be paved for a minimum of 100 feet. <br />Components of the asphalt batch plant will consist of approximately 10,000 gallons of emulsified <br />asphalt, approximately 25,000 gallons of ac cement and approximately 10,000 gallons of burner <br />fuel to operate the plant. Waste asphalt will also be used (recycled) at this plant. Waste oils <br />from the mining equipment at the site may be recycled and used in the production of asphalt. <br />The concrete batch plant consists only of the plant itself. Used or return concrete may be <br />recycled at the plant. Ad mixtures for the concrete will be stored adjacent to the plant on a <br />covered concrete pad. <br />No spills of significant quantities of any substance are known to exist at this site. <br />