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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> 3. Stabilize dust-generating soil by growing and maintaining vegetation,mulching,topsoiling, <br /> •'. and/or applying stone,sand, or gravel. <br /> 4. Apply windbreaks in the soil such as trees,board fences,tarpaulin curtains,bales of hay,etc. <br /> 5. Cover dust-generating piles with wind-impervious fabric,or equivalent material. <br /> Additional information on dust control can be found in Volume II of this manual. <br /> A6.2 Dust Control at Manufacturing Sites <br /> Description of Pollutant Sources: Industrial material handling activities can generate considerable <br /> amounts of dust that is typically removed using exhaust systems. This can generate air emissions that can <br /> contaminate stormwater. Dusts can be generated at cement and concrete product mixing facilities,and <br /> wherever powdered materials are handled. Particulate materials that are of concern to air pollution <br /> control agencies include grain dust,sawdust,coal,gravel,crushed rock, cement,and boiler fly ash. The <br /> objective of this BMP is to reduce the stormwater pollutants caused by dust generation and control. <br /> Pollutant Control Approach: Prevent dust generation and emissions where feasible,regularly cleanup <br /> dust that can contaminate stormwater, and convey dust contaminated stormwater to proper treatment. <br /> Required BMPs <br /> I. Clean powder material handling equipment and vehicles that can be sources of stormwater <br /> pollutants as needed to remove accumulated dust and residue. <br /> 2. Regularly sweep dust accumulation areas that can contaminate stormwater. Sweeping should be <br /> conducted using vacuum filter equipment to minimize dust generation and to ensure optimal dust <br /> removal. <br /> 3. Use in the recommended manner, approved dust suppressants such as those listed in Ecology <br /> publication"Techniques for Dust Prevention and Suppression,"No. 96-433 (Ecology 1996). <br /> Application of some products may not be appropriate in close proximity to receiving waters or <br /> conveyances close to receiving waters. For more information, check with the Ecology Northwest <br /> Regional Office or the City. <br /> Suggested BMPs <br /> 1. In manufacturing operations,train employees to carefully handle powders to prevent generation <br /> of dust. <br /> 2. Use dust filtration/collection systems such as bag house filters, cyclone separators,etc.to control <br /> vented dust emissions that could contaminate stormwater. Control of zinc dusts in rubber <br /> production is one example. <br /> 3. Use water spray to flush dust accumulations to sanitary sewers where allowed by the City or to <br /> other appropriate treatment system. Contact the City's Industrial Pretreatment Program at(425) <br /> 257-8874 for details. <br /> 4. For removal of total suspended solids in stormwater,use sedimentation basins,wet ponds,wet <br /> vaults,vegetated filter strips,or equivalent sediment removal BMPs. Refer to Volume III Flow <br /> Control and Treatment for more information about these BMPs. <br /> 5. Additional information on dust control can be found in Volume II of this manual. <br /> Volume IV— Source Control <br /> 3-42 <br />