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mater, and to a lesser degree increases in carbon monoxide and ozone. Peak day construction emissions for most pollutants arising from construction of the proposed project would occur during the grading and excavation phases. Using the South Coast Air Quality Management District CEQA Air Quality Handbook as a guideline, the threshold for potentially significant short-term air quality impacts would involve the grading of 1,309,000 square feet of area. Assuming grading of the entire project site, approximately 18,000 square feet of area would be graded. The proposed grading would be considerably less than the threshold of significance established by the CEQA Air Quality Handbook. While the construction of the proposed project would not exceed SCAQMD thresholds, dust that would be generated by grading activities could be a nuisance to nearby land uses. To contain and minimize dust impacts on the project site, the proposed proj ect would be subj ect to SCAQMD Rule 403. To ensure the proposed project complies with Fugitive Dust Rule 403, the following mitigation measures shall be implemented. . Grading plans for the proposed project shall reflect the following notes: 1. All material excavated or graded will be sufficiently watered to prevent excessive amounts of dust. Watering with complete coverage shall occur at least twice daily, once in the late morning and once after work is done for the day. 2. All clearing and earthwork activities shall cease during period of high winds (winds greater than 25 mph averaged over one hour) or during Stage 1 or Stage 2 smog episodes. 3. Streets surrounding the proj ect site should be cleaned at the end of each day of construction. 4. All material transported offsite shall either be sufficiently watered or securely covered to prevent excessive amounts of dust. 5. The amount earthwork times. of area activities disturbed shall be by clearing minimized at and all 7 758-22