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considers an air quality impact to be significant if it exceeds the criteria pollutant thresholds identified in the Table 1. Table 1 EMISSION THRESHOLDS OF SIGNIFICANCE Project Pollutant Construction Tons/ Operations Pounds/Day Quarter Pounds/Day Carbon Monoxide 550 24.75 550 Reactive Organic Compounds 75 2.5 55 Nitrogen Oxides 100 2.5 55 particulate Matter 150 6.75 150 Long-ter.m Operational Air Quality Impacts The proposed project would involve the development of 17 single- family dwelling units. The primary source of operational emissions would be generated by vehicle travel to and from the project site. A relatively minor amount of gaseous emissions would also occur from natural gas and electricity usage. Using the South Coast Air Quality Management District CEQA Air Quality Handbook as guideline, the threshold for potentially significant long-term air quality impacts would involve the development of 166 single-family dwelling units. The proposed proj ect would be less than the threshold of significance for long-term air quality impacts established by the CEQA Air Quality Handbook. Short-ter.m constructed Related Air Quality Impacts Construction operations associated with the proposed project could potentially result in short-term increases in particulate mater, and to a lesser degree increases in carbon monoxide and ozone. Peak day construction emissions for most pollutants would occur during the clearing, excavation and grading 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 117,612 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. To minimize dust impacts during 5 3'~~8