10200 19TH AVE SE COSTCO FUEL STATION 2022-05-23

• Educate employees and subcontractors on the concrete waste management techniques described in this BMP. • Arrange for contractor's superintendent or Certified Erosion and Sediment Control Lead (CESCL) to oversee and enforce concrete waste management procedures. • A sign should be installed adjacent to each temporary concrete washout facility to inform concrete equipment operators to utilize the proper facilities. Contracts Incorporate requirements for concrete waste management into concrete supplier and subcontractor agreements. Location and Placement • Locate washout area at least 50 feet from sensitive areas such as storm drains, open ditches, or water bodies, including wetlands. • Allow convenient access for concrete trucks, preferably near the area where the concrete is being poured. • If trucks need to leave a paved area to access washout, prevent track-out with a pad of rock or quarry spalls (see BMP C105: Stabilized Construction Entrance/ Exit (p.270)). These areas should be far enough away from other construction traffic to reduce the likelihood of accidental damage and spills. • The number of facilities you install should depend on the expected demand for storage capacity. • On large sites with extensive concrete work, washouts should be placed in multiple locations for ease of use by concrete truck drivers. On-site Temporary Concrete Washout Facility, Transit Truck Washout Procedures: • Temporary concrete washout facilities shall be located a minimum of 50 ft from sensitive areas including storm drain inlets, open drainage facilities, and watercourses. See Figure II-4.1.7a Concrete Washout Area (p.322), Figure II- 4.1.7b Concrete Washout Area (p.323), and Figure 11-4.1.8 Prefabricated Concrete Washout Container w/Ramp (p.324). • Concrete washout facilities shall be constructed and maintained in sufficient quantity and size to contain all liquid and concrete waste generated by washout operations. • Washout of concrete trucks shall be performed in designated areas only. • Concrete washout from concrete pumper bins can be washed into concrete pumper trucks and discharged into designated washout area or properly disposed of off-site. • Once concrete wastes are washed into the designated area and allowed to harden, the concrete should be broken up, removed, and disposed of per applicable solid waste regulations. Dispose of hardened concrete on a regular basis. • Temporary Above-Grade Concrete Washout Facility Page 145