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i <br /> BMP C140: Dust Control <br /> f <br /> Prnpose 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 /> x <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 /> I; <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. Maintain the original ground cover as long as practical. <br /> Construct natural or artificial windbreaks or windscreens. These may <br /> I <br /> be designed as enclosures for small dust sources. <br /> Sprinkle the site with water until surface is wet. Repeat as needed. To <br /> i prevent carryout of mud onto street, refer to Stabilized Construction <br /> j is Entrance(BM.P C 105). <br /> j • Irrigation water can be used for dust control. Irrigation systems should <br /> is be installed as a first step on sites where dust control is a concern. <br /> F • 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 suppressant. <br /> Local governments may approve other dust palliatives such as calcium <br /> chloride or PAM. <br /> 3 =; PAM (BMP C 126) 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 increased infiltration of water <br /> i. into the soil and reduced evaporation. In addition, small soil particles <br /> are bonded together and are not as easily transported by wind. Adding <br /> PAM may actually reduce the quantity of water needed for dust <br />[ .s control. Use of PAM could be a cost-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 /> Add surface gravel to reduce the source of dust emission. Limit the <br /> amount of fine particles (those smaller than .075 inm) to 10 to 20 <br /> percent. <br /> Volume H—Construction S1011111valer Pollution Prevention-August 2012 <br /> 4-40 <br /> f <br />