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UP-90-7 <br /> C) All material transported off-site shall be either <br /> sufficiently watered or securely covered to prevent <br /> excessive amounts of dust . <br /> D) The area disturbed by clearing , earth moving or <br /> excavation activities should be minimized at all times . <br /> E ) Instead of disking for weed control , the developer <br /> should mow, thereby leaving the ground undisturbed and <br /> with a mulch covering . <br /> After clearing , grading, earth moving, or excavation <br /> operations , during construction j)hase fugitive dust should <br /> be controlled using the following methods : <br /> A) All inactive portions of the construction site <br /> should be seeded and watered until grass growth is <br /> evident . <br /> B) All active portions of the site shall be <br /> sufficiently watered to prevent excessive amounts of dust. <br /> At all times, fugitive dust emissions should be controlled <br /> using the following procedures : <br /> A) On-site vehicle speed shall be limited to 15 mph . <br /> B) All areas with vehicle traffic should be watered <br /> periodically for stabilization of dust emissions . <br /> C) Use of petroleum-based dust palliative shall meet <br /> the road oil requirements of San Joaquin County Rule <br /> 409 . 5 , Cutback Asphalt Paving Materials . <br /> D) Streets adjacent to the project site should be <br /> swept as needed to remove silt which may have accumulated <br /> from construction activities . <br /> At all times , ozone precursor emissions should be <br /> controlled using the following methods : <br /> A) Equipment engines should be maintained in good <br /> condition and in proper tune as per manufacturer' s <br /> specifications. <br /> B) During the smog season (May through October) , the <br /> construction period should be lengthened so as to minimize <br /> the number of vehicles and equipment operating at the same <br /> time. <br />