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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 24 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 minimized 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. f 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. STVl7APCD 8126192 ' Use of petroleum-based palliatives shall meet the road oil requirements of the District's Rule j 409.5 - Cutback Asphalt Paving Materials.