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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 amounts 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 minimized at all times. ► Where acceptable to the fire department, weed control should be accomplished by mowing instead of discing, 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. ► During rough grading and construction, streets adjacent to the project site should be swept at least once per day, or as required by the Revised 1/15/93