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accumulated dirty runoff and solids must be collected and disposed of before removing the cover at the end of the day. Suggested BMPs The following BMPs are not required,but can provide additional pollution protection: 1.Materials should be recycled whenever possible. 2. Light spraying of water on the work site can control some of the dust and grit that can blow away. Oils must never be used for dust control.Never spray to the point of runoff from the site. 3.Activities such as tool cleaning should occur over a ground cloth or within a containment device such as a tub. A6.1-Dust Control at Disturbed Land Areas and Unpaved Roadways and Parking Lots Description of Pollutant Sources: Dust can cause air and water pollution problems particularly at demolition sites,disturbed land areas,and unpaved driving and parking areas. Pollutant Control Approach: Minimize dust generation and apply environmentally friendly and government approved dust suppressant chemicals, if necessary. Required BMPs 1. Sprinkle or wet down soil or dust with water as long as it does not result in a wastewater discharge. 2. Only local and/or state government approved dust suppressant chemicals shall be used, such as those listed in Ecology publication No.96-433, "Techniques for Dust Prevention and Suppression."See BMP C126, Polyacrylamide for Soil Erosion Protection,in Volume II of this manual. 3.Avoid excessive and repeated applications of dust suppressant chemicals. Time the application of dust suppressants to avoid or minimize their wash-off by rainfall or human activity such as irrigation. 4.Apply stormwater containment to prevent the conveyance of sediments and or dust suppressant chemicals into storm drains or receiving waters. 5.The use of motor oil for dust control is prohibited.Care should be taken when using lignin derivatives and other high BOD chemicals in excavations or areas easily accessible to surface water or groundwater. 6. Consult with the Ecology Northwest Regional Office on discharge permit requirements if the dust suppression process results in a wastewater discharge to the ground,groundwater,storm drain,or surface water. Suggested BMPs for Roadways and Other Trafficked Areas 1. Consider limiting use of off-road recreational vehicles on dust generating land. 2. Consider paving unpaved permanent roads and other trafficked areas at municipal,commercial,and industrial areas. 3.Consider paving or stabilizing shoulders of paved roads with gravel, vegetation,or City approved chemicals. 4. Encourage use of alternate paved routes,if available. 5.Vacuum or wet sweep fine dirt and skid control materials from paved roads soon after winter weather ends or when needed.