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the rubble. The loose debris may contaminate stormwater. <br /> Pollutants of concern include toxic organic compounds, hazardous wastes, high pH, heavy metals, <br /> and suspended solids. <br /> Pollutant Control Approach: Do not expose hazardous materials to stormwater. Regularly clean <br /> up debris that can contaminate stormwater. Protect the drainage system from dirty runoff and loose <br /> particles. Sweep paved surfaces daily. Educate employees about the need to control site activities. <br /> Applicable Operational BMPs: <br /> . Identify, remove, and properly dispose of hazardous substances from the building before <br /> beginning construction demolition activities that could expose them to stormwater. Such sub- <br /> stances could include PCBs, asbestos, lead paint, mercury switches, and electronic waste. <br /> . Educate employees about the need to control site activities to prevent stormwater pollution, <br /> and also train them in spill cleanup procedures. <br /> . Keep debris containers,dumpsters, and debris piles covered. <br /> . Place storm drain covers, or a similarly effective containment device, on all nearby drains to <br /> prevent dirty runoff and loose particles from entering the drainage system. <br /> • Place the covers(or devices)at the beginning of the workday. <br /> • Collect and properly dispose of the accumulated materials before removing the covers <br /> (or devices)at the end of the workday. <br /> Use dikes, berms, or other methods to protect overland discharge paths from runoff if <br /> stormwater drains are not present. <br /> . Sweep street gutters, sidewalks, driveways, and other paved surfaces in the immediate area <br /> of the demolition at the end of each workday. Collect and properly dispose of loose debris and <br /> garbage. <br /> . Lightly spray water(such as from a hydrant or water truck)throughout the site to help control <br /> windblown fine materials such as soil, concrete dust, and paint chips. Control the amount of <br /> dust control water so that runoff from the site does not occur, yet dust control is achieved. Do <br /> not use oils for dust control. <br /> Suggested Operational BMPs: <br /> . Construct a screen to prevent stray building materials and dust from escaping the area during <br /> demolition. Size and orient the screen to capture wind-blown materials and contain them <br /> onsite. <br /> . Schedule demolition to take place at a dry time of the year to prevent stormwater runoff from <br /> the demolition site. <br /> 2019 Stormwater Management Manual for Western Washington <br /> Volume IV-Chapter 7-Page 600 <br />