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I BMP C151: Concrete HandlingI Purpose I Concrete work can generate process water and slurry that contain fine particles and high pH, both of which can violate water quality standards in the receiving water. Concrete spillage or concrete discharge to surface waters of the State is prohibited. Use this BMP to minimize and eliminate concrete, concrete process water, and concrete slurry from entering waters of the state. I Conditions of Use Any time concrete is used, utilize these management practices. Concrete construction I projects include, but are not limited to, the following: • Curbs I . Sidewalks . Roads I . Bridges . Foundations . Floors . Runways Design and Installation Specifications I . Assure that washout of concrete trucks, chutes, pumps, and internals is performed at an approved off-site location or in designated concrete washout areas. Do not wash out concrete trucks onto the ground, or into storm drains, open ditches, streets, or streams. Refer to BMP C154: Concrete Washout Area (p.317)for inform- ation on concrete washout areas. I • Return unused concrete remaining in the truck and pump to the originating batch plant for recycling. Do not dump excess concrete on site, except in designated con- I crete washout areas. • Wash off hand tools including, but not limited to, screeds, shovels, rakes,floats, and trowels into formed areas only. . Wash equipment difficult to move, such as concrete pavers in areas that do not dir- ectly drain to natural or constructed stormwater conveyances. . Do not allow washdown from areas, such as concrete aggregate driveways, to drain directly to natural or constructed stormwater conveyances. I • Contain washwater and leftover product in a lined container when no formed areas I 2014 Stormwater Management Manual for Western Washington Volume Il- Chapter 4 -Page 313 I