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BMP C140: Dust Control <br />Purpose <br />Dust control prevents wind transport of dust from disturbed soil surfaces onto roadways, <br />drainage ways, and surface waters. <br />Conditions of Use <br />In areas (including roadways) subject to surface and air movement of dust where <br />on -site and off -site impacts to roadways, drainage ways, or surface waters are <br />likely. <br />Design and Installation Specifications <br />. Vegetate or mulch areas that will not receive vehicle traffic. In areas where plant- <br />ing, mulching, or paving is impractical, apply gravel or landscaping rock. <br />. Limit dust generation by clearing only those areas where immediate activity will <br />take place, leaving the remaining area(s) in the original condition. Maintain the ori- <br />ginal ground cover as long as practical. <br />. Construct natural or artificial windbreaks or windscreens. These may be designed <br />as enclosures for small dust sources. <br />. Sprinkle the site with water until surface is wet. Repeat as needed. To prevent <br />carryout of mud onto street, refer to BMP C105: Stabilized Construction Entrance / <br />Exit (p.270). <br />. Irrigation water can be used for dust control. Irrigation systems should be installed <br />as a first step on sites where dust control is a concern. <br />. Spray exposed soil areas with a dust palliative, following the manufacturer's <br />instructions and cautions regarding handling and application. Used oil is pro- <br />hibited from use as a dust suppressant. Local governments may approve other <br />dust palliatives such as calcium chloride or PAM. <br />. PAM (BMP C126: Polyacrylamide (PAM) for Soil Erosion Protection (p.300)) <br />added to water at a rate of 0.5 lbs. per 1,000 gallons of water per acre and applied <br />from a water truck is more effective than water alone. This is due to increased infilt- <br />ration of water into the soil and reduced evaporation. In addition, small soil <br />particles are bonded together and are not as easily transported by wind. Adding <br />PAM may actually reduce the quantity of water needed for dust control. Use of <br />PAM could be a cost-effective dust control method. <br />Techniques that can be used for unpaved roads and lots include: <br />2014 Stormwater Management Manual for Westem Washington <br />Volume ll - Chapter 4 - Page 310 <br />