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SAN JOAQUIN COUNTY <br /> AIR POLLUTION CONTROL DISTRICT <br /> Suggested Mitigation Measures <br /> A. Emissions generated during the construction process are of <br /> concern to the District. The following dust control <br /> practices should be implemented: <br /> 1) All material excavated or graded should be sufficiently <br /> watered to prevent excessive amount of dust. Watering <br /> should occur at least twice a day with complete <br /> coverage, preferably in the late morning and after work <br /> is done for the day. <br /> 2) All clearing, grading earth moving or excavation <br /> activities shall cease during periods of high winds <br /> greater than 20 mph average over one hour. <br /> 3) All material transported off-site shall be either <br /> sufficiently watered or securely covered to prevent <br /> excessive amount of dust. <br /> 4) The area disturbed by clearing, earth moving or <br /> excavation activities should be minimized at all times. <br /> 5) The developer should mow instead of disking for weed <br /> control, thereby leaving the ground undisturbed and with <br /> a mulch covering. <br /> B. After clearing, grading, earth moving, or excavation <br /> operation, fugitive dust emissions during construction phase <br /> should be controlled by the following methods: <br /> 1) All inactive portions of the construction site should be <br /> seeded and watered until grass growth is evident. <br /> 2) All active portions of the site shall be sufficiently <br /> watered to prevent excessive amount of dust. <br /> C. At all times, fugitive dust emissions should be controlled <br /> using the following procedures: <br /> 1) On-site vehicle speed shall be limited to 15 mph. <br /> 2) All area with vehicle traffic should be watered <br /> periodically for stabilization of dust emissions. <br />