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. Add surface gravel to reduce the source of dust emission. Limit the <br />amount of fine particles (those smaller than .075 mm) to 10 to 20 <br />percent. <br />• Use geotextile fabrics to increase the strength of new roads or roads <br />undergoing reconstruction. <br />• Encourage the use of alternate, paved routes, if available. <br />• Restrict use by tracked vehicles and heavy trucks to prevent damage to <br />road surface and base. <br />. Apply chemical dust suppressants using the admix method, blending <br />the product with the top few inches of surface material. Suppressants <br />may also be applied as 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 <br />into dust. <br />. Limit dust-causing work on windy days. <br />• Contact your local Air Pollution Control Authority for guidance and <br />training on other dust control measures. Compliance with the local Air <br />Pollution Control Authority constitutes compliance with this BMP. <br />Maintenance Respray area as necessary to keep dust to a minimum. <br />Standards <br />February 2005 Volume ll — Construction Stormwater Pollution Prevention 4-41 <br />