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San Joaquin County May 18, 1998 QX-98-1 Page Additionally, the following list highlights some effective measures to reducing PM-10 emissions generated by this facility. ♦ The areas disturbed by clearing, earth moving, or excavation activities should be minimized at all times. All inactive portions of the site should be seeded and watered until vegetation has sufficiently grown to cover bare earth. • All materials transported off-site (trucks hauling earth, gravel or other materials to and from the project site) shall be either sufficiently watered or securely covered to prevent excessive amounts of dust. • If fill dirt is brought to the excavation site, then tarps or soil stabilizers should be placed on the dirt piles to minimize dust problems. ♦ When heavy equipment leaves the construction site, all excessive dirt accumulations on the equipment should be cleaned. • On-site vehicle speed should be limited to 15 miles per hour. Vehicle speed control can reduce fugitive dust emissions from unpaved roads and areas at construction sites by up to 60% assuming compliance with the 15 mph speed limit. To reduce ozone precursor emissions, the District strongly recommends the project proponent implement the following feasible measures which are designed to reduce this project's impact to the ambient air quality. ♦ Ensure all internal combustion engine driven equipment is properly tuned to manufacturer's specifications. ♦ Limit on-site idle time of heavy equipment to 10 minutes. ♦ Encourage employees to rideshare or carpool to job site to reduce the amount of vehicle traffic to and from the project area. During smog season (May through October), the construction period should be lengthened to minimize the number of vehicles and equipment operating at the same level. • When available, natural gas powered or electric equipment shall be utilized in lieu of gasoline and diesel powered engines.