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0 <br />BMP C151: Concrete Handling <br />Purpose Concrete work can generate process water and slurry that contain iine <br />particles and high pH, both of which can violate water quality standards in <br />the receiving water. This BMP is intended to minimize and eliminate <br />concrete process water and slurry from entering waters of the state. <br />Conditions of Use Any time concrete is used, these management practices shall be utilized. <br />Concrete construction projects include, but are not limited to, the <br />following: <br />Design and <br />Installation <br />Specifications <br />Maintenance <br />Starc dai�ds <br />• Curbs <br />• Sidewalks <br />• Roads <br />. Bridges <br />• Foundations <br />• Floors <br />. Runways <br />• Concrete truck chutes, pumps, and internals shall be washed out only <br />into formed areas awaiting installation of concrete or asphalt. <br />• Unused concrete remaining in the truck and pump shall be returned to <br />the originating batch plant for recycling. <br />• Hand tools including, but not limited to, screeds, shovels, rakes, floats, <br />and trowels shall be washed off only into formed areas awaiting <br />installation of concrete or asphalt. <br />• Equipment that cannot be easily moved, such as concrete pavers, shall <br />only be washed in areas that do not directly drain to natural or <br />constructed stormwater conveyances. <br />• Washdown from areas such as concrete aggregate driveways shall not <br />drain directly to natural or constructed stormwater conveyances. <br />• When no formed areas are available, washwater and leftover product <br />shall be contained in a lined container. Contained concrete shall be <br />disposed of in a manner that does not violate groundwater or surface <br />water quality standards. <br />Containers shall be checked for holes in the liner daily during concrete <br />pours and repaired the same day. <br />February 2005 Volume ll — Construction Stormwater Pollution Prevention 4-43 <br />