Laserfiche WebLink
BMP C154: Concrete Washout Area <br /> Purpose <br /> Prevent or reduce the discharge of pollutants to stormwater from concrete waste by <br /> conducting washout off-site, or performing on-site washout in a designated area to <br /> prevent pollutants from entering surface waters or ground water. <br /> Conditions of Use <br /> Concrete washout area best management practices are implemented on construction <br /> projects where: <br /> • Concrete is used as a construction material <br /> • It is not possible to dispose of all concrete wastewater and washout off-site <br /> (ready mix plant, etc.). <br /> • Concrete trucks, pumpers, or other concrete coated equipment are washed on- <br /> site. <br /> • Note: If less than 10 concrete trucks or pumpers need to be washed out on-site, <br /> the washwater may be disposed of in a formed area awaiting concrete or an <br /> upland disposal site where it will not contaminate surface or ground water. The <br /> upland disposal site shall be at least 50 feet from sensitive areas such as storm <br /> drains, open ditches, or water bodies, including wetlands. <br /> Design and Installation Specifications <br /> Implementation <br /> The following steps will help reduce stormwater pollution from concrete wastes: <br /> • Perform washout of concrete trucks at an approved off-site location or in <br /> designated concrete washout areas only. <br /> • Do not wash out concrete trucks onto the ground, or into storm drains, open <br /> ditches, streets, or streams. <br /> • Do not allow excess concrete to be dumped on-site, except in designated <br /> concrete washout areas. <br /> • Concrete washout areas may be prefabricated concrete washout containers, or <br /> self-installed structures (above-grade or below-grade). <br /> • Prefabricated containers are most resistant to damage and protect against spills <br /> and leaks. Companies may offer delivery service and provide regular <br /> maintenance and disposal of solid and liquid waste. <br /> • If self-installed concrete washout areas are used, below-grade structures are <br /> preferred over above-grade structures because they are less prone to spills and <br /> leaks. <br /> • Self-installed above-grade structures should only be used if excavation is not <br /> practical. <br /> Education <br /> • Discuss the concrete management techniques described in this BMP with the <br /> ready-mix concrete supplier before any deliveries are made. <br /> Page 144 <br />