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1 <br /> ' . Lower speed limits. High vehicle speed increases the amount of dust stirred up <br /> from unpaved roads and lots. <br /> . Upgrade the road surface strength by improving particle size, shape, and mineral <br /> types that make up the surface and base materials. <br /> . Add surface gravel to reduce the source of dust emission. Limit the amount of fine <br /> particles (those smaller than .075 mm)to 10 to 20 percent. <br /> . Use geotextile fabrics to increase the strength of new roads or roads undergoing <br /> reconstruction. <br /> . Encourage the use of alternate, paved routes, if available. <br /> . Restrict use of paved roadways by tracked vehicles and heavy trucks to prevent <br /> damage to road surface and base. <br /> . Apply chemical dust suppressants using the admix method, blending the product <br /> with the top few inches of surface material. Suppressants may also be applied as <br /> 1 surface treatments. <br /> . Pave unpaved permanent roads and other trafficked areas. <br /> . Use vacuum street sweepers. <br /> . Remove mud and other dirt promptly so it does not dry and then turn into dust. <br /> . Limit dust-causing work on windy days. <br /> . Contact your local Air Pollution Control Authority for guidance and training on other <br /> dust control measures. Compliance with the local Air Pollution Control Authority <br /> constitutes compliance with this BMP. <br /> IMaintenance Standards <br /> Respray area as necessary to keep dust to a minimum. <br /> 1 <br /> 1 <br /> 1 <br /> I <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume II- Chapter 4 -Page 311 <br />