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Design and Installation Specifications <br />Implementation <br />. Perform washout of concrete truck drums at an approved off -site location or in designated con- <br />crete washout areas only. <br />. Do not wash out concrete onto non -formed areas, or into storm drains, open ditches, streets, <br />or streams. <br />. Wash equipment difficult to move, such as concrete paving machines, in areas that do not dir- <br />ectly drain to natural or constructed stormwater conveyance or potential infiltration areas. <br />. Do not allow excess concrete to be dumped on -site, except in designated concrete washout <br />areas as allowed above. <br />• Concrete washout areas may be prefabricated concrete washout containers, or self -installed <br />structures (above -grade or below -grade). <br />. Prefabricated containers are most resistant to damage and protect against spills and leaks. <br />Companies may offer delivery service and provide regular maintenance and disposal of solid <br />and liquid waste. <br />. If self -installed concrete washout areas are used, below -grade structures are preferred over <br />above -grade structures because they are less prone to spills and leaks. <br />. Self -installed above -grade structures should only be used if excavation is not practical. <br />. Concrete washout areas shall be constructed and maintained in sufficient quantity and size to <br />contain all liquid and concrete waste generated by washout operations. <br />Education <br />. Discuss the concrete management techniques described in this BMP with the ready -mix con- <br />crete supplier before any deliveries are made. <br />. Educate employees and subcontractors on the concrete waste management techniques <br />described in this BMP. <br />. Arrange for the contractor's superintendent or Certified Erosion and Sediment Control Lead <br />(CESCL) to oversee and enforce concrete waste management procedures. <br />. A sign should be installed adjacent to each concrete washout area to inform concrete equip- <br />ment operators to utilize the proper facilities. <br />Contracts <br />Incorporate requirements for concrete waste management into concrete supplier and subcontractor <br />agreements. <br />2019 Stormwater Management Manual for Western Washington <br />Volume // - Chapter 3 - Page 321 <br />