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F _ m SAN JOAQUIN VALLEY UNIFIED AXR POLLUTION CONTROL DISTRICT . SAN JOAQUIN COUNTY ZONE Suggested Mitigation Measures A. Emissions generated during the construction process are of concern to the District. The following dust control practices should be implemented: 1) 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. 2) All clearing, grading earth moving or excavation activities shall cease during periods of high winds greater than 20 mph average over one hour. I 3 ) All material transported off-site shall be either sufficiently watered or securely covered to prevent excessive amount of dust. 4 ) The area disturbed by clearing, earth moving or excavation activities should be minimized at all times . 5) The developer should mow instead of disking for weed control, thereby leaving the ground undisturbed and with a mulch covering. B. After clearing, grading, earth moving, or excavation operation, fugitive dust emissions during construction phase should be controlled by the following methods : 1) All inactive portions of the construction site should be seeded and watered until grass growth is evident. 2) All active portions of the site shall be sufficiently watered to prevent excessive amount of dust. C. At all times , fugitive dust emissions should be controlled using the following procedures : 1) On--site vehicle speed shall be limited to 15 mph. 2) All area with vehicle traffic should be watered periodically for stabilization of dust emissions . 3) Use of petroleum-based dust palliative shall meet the road oil requirements of the District ' s Rules 409 . 5 Cutback Asphalt Paving Materials .