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Riprap and sediment traps - Riprap and sediment traps may be used at discharge points, due <br />to the potential for high velocities. <br />Perimeter sediment control - A perimeter sediment control system will be used adjacent to <br />wetlands or other waterways where adjacent mining areas have the potential to drain to these <br />waterways and deposit sediment or other pollutants. A perimeter sediment control system will <br />also be used in areas where adjacent mining areas have the potential to drain off-site and <br />deposit sediment or other pollutants. The perimeter sediment control system may include silt <br />fence, soil berms/swales, straw bales/logs or other structural practices. <br />Surface roughening - During final reclamation, surface roughening of slopes may be <br />performed. Surface roughening may include driving equipment across the surface of slopes <br />so that the soil surface has numerous divots and depressions to slow and capture stormwater <br />runoff. <br />Hall Irwin may also employ the following non-structural site management practices. <br />• Existing vegetation will be preserved where possible. <br />• Seeding and mulching - stockpiles left in place for more than six months will be seeded with a <br />dryland grass seed mix to stabilize the side slopes. <br />• Good Housekeeping - Routine removal of trash and debris will be performed. <br />• Routine Inspections - Observations of the storm water management program for the site will <br />be performed at a minimum of every 14 days and after a major precipitation event as required <br />by the permit. Any deficiencies noted during the inspection will be corrected within 7 days. <br />The inspections will be reported on an inspection log and will be included in the SWMP binder <br />for the project. <br />Identification of Discharges other than Stormwater <br />Site conditions will dictate when/which control measure will be used. This plan will be revised as <br />necessary to address varying site conditions and to resolve any issues that are identified through <br />routine site inspections. <br />SWMP Administrator- Jim McFarland, of Hall Irwin will be responsible for implementing the SWMP <br />as well as maintaining and revising the SWMP. The goal of the SWMP is to improve water quality by <br />reducing pollutants in stormwater discharges. <br />D:\Adobe\Bestway Concrete\Rocky Flats\Updated Slormwater Management Plan 09.doc <br />Hall-Irwin Corporation's Church McKay -3- July 2008 <br />Stormwater Management Plan