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BMP C140: Dust Control <br /> Purpose Dust control prevents wind transport of dust from disturbed soil surfaces <br /> onto roadways, drainage ways, and surface waters. <br /> Conditions of Use • In areas(including roadways)subject to surface and air movement of <br /> dust where on-site and off-site impacts to roadways, drainage ways, or <br /> ' surface waters are likely. <br /> Design and • Vegetate or mulch areas that will not receive vehicle traffic. In areas <br /> Installation where planting,mulching, or paving is impractical,apply gravel or <br /> Specifications landscaping rock. <br /> • Limit dust generation by clearing only those areas where immediate <br /> ' activity will take place, leaving the remaining area(s)in the original <br /> condition,if stable. Maintain the original ground cover as long as <br /> practical. <br /> ' • Construct natural or artificial windbreaks or windscreens. These may <br /> be designed as enclosures for small dust sources. <br /> ' • Sprinkle the site with water until surface is wet. Repeat as needed. To <br /> prevent carryout of mud onto street, refer to Stabilized Construction <br /> Entrance(BMP C105). <br /> ' a Irrigation water can be used for dust control. Irrigation systems should <br /> be installed as a first step on sites where dust control is a concern. <br /> ' • Spray exposed soil areas with a dust palliative, following the <br /> manufacturer's instructions and cautions regarding handling and <br /> application. Used oil is prohibited from use as a dust suppressants <br /> Local governments may approve other dust palliatives such as calcium <br /> chloride or PAM. <br /> • PAM (BMP C126) added to water at a rate of 0.5 lbs.per 1,000 <br /> ' gallons of water per acre and applied from a water truck is more <br /> effective than water alone. This is due to the increased infiltration of <br /> ' water into the soil and reduced evaporation. In addition, small soil <br /> particles are bonded together and are not as easily transported by wind. <br /> Adding PAM may actually reduce the quantity of water needed for <br /> ' dust control, especially in eastern Washington. Since the wholesale <br /> cost of PAM is about$4.00 per pound,this is an extremely cost- <br /> effective dust control method. <br /> Techniques that can be used for unpaved roads and lots include: <br /> • Lower speed limits. High vehicle speed increases the amount of dust <br /> ' stirred up from unpaved roads and lots. <br /> • Upgrade the road surface strength by improving particle size, shape, <br /> and mineral types that make up the surface and base materials. <br /> 4-40 Volume II—Construction Stormwater Pollution Prevention February 2005 <br />