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Suggested Air Quality Dust Mitigation Measures (for Construction Sites) Pre-Construction - Emissions generated during the pre-construction process are of a concern to the District. The following dust control practices should be implemented: > All material excavated or graded should be sufficiently watered to prevent excessive amount of dust. Watering should occur at least twice a day with complete coverage, preferably in the late morning and after work is done for the day. > All clearing, grading, earth moving, or excavation activities should cease during periods of high winds greater than 20 mph average over one hour. > All material transported off-site should be either sufficiently watered or securely covered to prevent excessive amounts of dust. > The area disturbed by clearing, earth moving, or excavation activities should be minimised at all times. > The developer should mow, instead of disking, for weed control, thereby leaving the ground undisturbed and with a mulch covering. During Construction - After clearing, grading, earth moving, or excavation operations, during the construction phase, fugitive dust emissions should be controlled by the following methods: > All inactive portions of the construction site should be seeded and watered until grass growth is evident. > All active portions should be sufficiently watered to prevent excessive amounts of dust. General Fugitive Dust - At all times, fugitive dust emissions should be controlled using the following procedures: > On-site vehicle speed should be limited to 15 mph. > All areas with vehicle traffic should be watered periodically or have petroleum-based palliatives' applied for stabilization of dust emissions. > Streets adjacent to the project site should be swept at least once per day to remove silt which may have accumulated from construction activities. > Build a paved "apron" into project from ajoining paved roadways. Ozone Precursors - At all times, ozone precursor emissions should be controlled by the following methods: > All internal combustion engines driven equipment should be properly maintained and well tuned according to manufacturer's specifications. > During the smog season (May through October), the construction period should be lengthened so as to minimize the number of vehicles and equipment operating at the same time. STVUAPCD 8/26/92 ' Use of petroleum-based palliatives shall meet the road oil requirements of the District's Rule 409.5 - Cutback Asphalt Paving Materials.