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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br />Material <br />Measure <br />Quantity <br />Clear Plastic, 6 mil <br />100 foot roll <br />1-2 <br />Drainpipe, 6 or 8 inch diameter <br />25 foot section <br />4-6 <br />Sandbags, filled <br />each <br />25-50 <br />Straw Bales for mulching <br />approx. 50# each <br />10-20 <br />Quarry Spalls <br />ton <br />2-4 <br />Washed Gravel <br />cubic yard <br />2-4 <br />Geotextile Fabric <br />100 foot roll <br />1-2 <br />Catch Basin Inserts <br />each <br />2-4 <br />Steel T-Posts <br />each <br />12-24 <br />3.2.18 BMP C151: Concrete Handling <br />Purpose <br />Concrete work can generate process water and slurry that contain fine particles and high pH, both of <br />which can violate water quality standards in the receiving water. This BMP is intended to minimize and <br />eliminate concrete process water and slurry from entering waters of the state. <br />Conditions of Use <br />For use any time concrete is used, these management practices shall be utilized. Concrete construction <br />projects include, but are not limited to, the following: <br />1. Curbs <br />2. Sidewalks <br />3. Roads <br />4. Bridges <br />5. Foundations <br />6. Floors <br />7. Runways. <br />Design and Installation Specifications <br />1. Concrete truck chutes, pumps, and internals shall be washed out only into formed areas awaiting <br />installation of concrete or asphalt. <br />2. Unused concrete remaining in the truck and pump shall be returned to the originating batch plant <br />for recycling, as feasible. <br />3. Hand tools including, but not limited to, screeds, shovels, rakes, floats, and trowels shall be <br />washed off only into formed areas awaiting installation of concrete or asphalt. <br />4. Equipment that cannot be easily moved, such as concrete pavers, shall only be washed in areas <br />that do not directly drain to natural or constructed stormwater conveyances. <br />5. Wash down from areas such as concrete aggregate driveways shall not drain directly to natural or <br />constructed stormwater conveyances. <br />Volume 11 — Construction Stormwater Pollution Prevention <br />3-30 <br />