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i <br /> ` l <br /> 4 <br /> BMP C154: Concrete Washout Area <br /> _ Propose Prevent or reduce the discharge of pollutants to stormwater from concrete <br /> waste by conducting washout off-site, or performing on-site washout in a <br /> designated area to prevent pollutants from entering surface waters or <br /> ground water. <br /> Conditions of Use Concrete washout area best management practices are implemented on <br /> construction projects where: <br /> • Concrete is used as a construction material <br /> f <br /> • It is not possible to dispose of all concrete wastewater and washout <br /> off-site {ready mix plant, etc.}. <br /> • Concrete tricks, pumpers, or other concrete coated equipment are <br /> washed on-site. <br /> Note: If less than 10 concrete trucks or pumpers need to be washed out <br /> i on-site, the washwater may be disposed of in a formed area awaiting <br /> i . <br /> ' concrete or an upland disposal site where it will not contaminate <br /> surface or ground water. The upland disposal site shall be at least 50 <br /> feet from sensitive areas such as storm drains, open ditches, or water <br /> bodies, including wetlands. <br /> l <br /> Design and Implementation <br /> i Installation <br />[ The following steps will help reduce stormwater pollution from concrete <br /> Specifications wastes: <br /> is • Perform washout of concrete trucks off-site or in designated concrete <br /> washout areas only. <br /> E. <br />€ Do not wash out concrete trucks onto the ground, or into storm drains, <br /> f: <br /> open ditches, streets, or streams. <br /> fi <br /> • Do not allow excess concrete to be dumped on-site, except in <br /> designated concrete washout areas. <br />¢ Concrete washout areas may be prefabricated concrete washout <br /> containers, or self-installed structures (above-grade or below-grade). <br /> • Prefabricated containers are most resistant to damage and protect <br /> against spills and leaks. Companies may offer delivery service and <br /> r provide regular maintenance and disposal of solid and liquid waste. <br /> If self-installed concrete washout areas are used, below-grade <br /> structures are preferred over above-grade structures because they are <br /> less prone to spills and leaks. <br /> • Self-installed above-grade structures should only be used if excavation <br /> iJ. is not practical. <br /> is <br /> Yohnne 11—Construction Ston nwater Pollution Prevention -August 2012 <br /> 4-47 <br />