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compliance with this BMP. <br /> . Use vacuum street sweepers. <br /> . Remove mud and other dirt promptly so it does not dry and then turn into dust. <br /> . Techniques that can be used for unpaved roads and lots include: <br /> o Lower speed limits. High vehicle speed increases the amount of dust stirred up from <br /> unpaved roads and lots. <br /> • Upgrade the road surface strength by improving particle size,shape, and mineral types <br /> that make up the surface and base materials. <br /> o 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 recon- <br /> struction. <br /> o Encourage the use of alternate, paved routes, if available. <br /> o Apply chemical dust suppressants using the admix method, blending the product with <br /> the top few inches of surface material.Suppressants may also be applied as surface <br /> treatments. <br /> o Limit dust-causing work on windy days. <br /> o Pave unpaved permanent roads and other trafficked areas. <br /> Maintenance Standards <br /> Respray area as necessary to keep dust to a minimum. <br /> BMP C150: Materials on Hand <br /> Purpose <br /> Keep quantities of erosion prevention and sediment control materials on the project site at all times <br /> to be used for regular maintenance and emergency situations such as unexpected heavy rains. Hav- <br /> ing these materials on-site reduces the time needed to replace existing or implement new BMPs <br /> when inspections indicate that existing BMPs are not meeting the Construction SWPPP require- <br /> ments. In addition,contractors can save money by buying some materials in bulk and storing them at <br /> their office or yard. <br /> Conditions of Use <br /> . Construction projects of any size or type can benefit from having materials on hand.A small <br /> commercial development project could have a roll of plastic and some gravel available for <br /> immediate protection of bare soil and temporary berm construction.A large earthwork project, <br /> such as highway construction, might have several tons of straw,several rolls of plastic,flexible <br /> 2019 Stormwater Management Manual for Western Washington <br /> Volume ll-Chapter 3-Page 314 <br />