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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL 3.3.5 Activity Code A5 - Construction and Demolition Activities A5.1 Demolition of Buildings Description of Pollutant Sources: This activity applies to removal of existing buildings by controlled explosions,wrecking balls,or manual methods,and subsequent clearing of the rubble. The loose debris can contaminate stormwater. Pollutants of concern include toxic organic compounds,heavy metals,and suspended solids. Pollutant Control Approach: Regularly cleanup debris that can contaminate stormwater. Protect the stormwater drainage system from dirty runoff and loose particles. Sweep paved surfaces daily. Required BMPs The following BMPs or equivalent measures are required of all businesses and public agencies engaged in building demolition: 1. Storm drain covers or a similarly effective containment device must be placed on all nearby drains to prevent dirty runoff and loose particles from entering the stormwater drainage system. Covers shall be placed at the beginning of the workday and the accumulated materials collected and disposed of before removing the covers at the end of the workday. If storm drains are not present,dikes,berms,or other methods must be used to protect overland discharge paths from runoff. See BMPs S.2 and S.7 in Chapter 4 for more information on runoff control and disposal options.Street gutters,sidewalks, driveways,and other paved surfaces in the immediate area of the demolition must be swept at the end of each workday to collect and properly dispose of loose debris and garbage. 2. Check with the City's Building Department(425)257-8810 to obtain required permits. Suggested BMPs 1. Water should be sprayed throughout the site to help control wind blowing of fine materials such as soil,concrete dust,and paint chips. The amount of water must be controlled so that runoff from the site does not occur,yet dust control is achieved. Oils must never be used for dust control. 2. If possible,a wall should be constructed to prevent stray building materials and dust from escaping the area during demolition. 3. Schedule demolition to take place at a dry time of the year. A5.2 Building Repair, Remodeling, Painting, and Construction Description of Pollutant Sources: This activity refers to activities associated with construction of buildings and other structures,remodeling of existing buildings and houses,and general exterior building repair work. Concrete pouring is covered under A3.2 Concrete Pouring and Asphalt Application at Temporary Sites. Pollutants of concern include toxic hydrocarbons,toxic organics, suspended solids,heavy metals,pH, oils,and greases. Pollutant Control Approach: Employees must be educated about the need to control site activities. Control leaks,spills,and loose material. Utilize good housekeeping practices. Volume IV—Source Control 3-39