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III. ENVIRONMENTAL SETTING,IMPACTS AND MITIGATION MEASURES B. AIR QUALITY These standards are typically applied to the results of a health risk assessment or detailed air dispersion modeling effort using the ARB's Industrial Source Complex Short-Term(ISC3ST) model. Lastly, any proposed project that would individually have a significant air quality impact would also be considered to have a significant cumulative air quality impact. Impacts of local pollutants (e.g., CO and toxic air contaminants)are cumulatively significant when modeling shows that the combined emissions from the project and other existing and planned projects will exceed air quality standards. IMPACT STATEMENTS AND MITIGATION MEASURES Impact B.1: Fugitive dust generated by construction activities would be substantial and would contribute to intermittent ambient respirable particulate matter concentrations that, could violate state PM-10 standards(Significant). Fugitive dust emitted during construction would vary greatly from day to day depending upon the level of activity, the equipment being operated, silt content of the soil, and the prevailing weather. Larger-diameter dust particles(i.e.,greater than 30 microns)generally fall out of the atmosphere within several hundred feet of construction sites,and represent more of a soiling nuisance than a health hazard. Smaller-diameter particles (e.g., PM-10)generally remain airborne until removed from the atmosphere by moisture, and are associated with adverse health effects. As indicated in the Setting section,residential land uses are located immediately west of the project site; therefore,unmitigated construction dust emissions could result in significant local effects. The SJVUAPCD recommends determination of significance with respect to construction impacts be based not on quantification of emissions and comparison to thresholds,but upon inclusion of feasible control measures for PM-10 and compliance with Regulation VIII,Rule 8010. For all construction projects, implementation of all Regulation VIII fugitive dust control measures are required by law. Therefore, the applicant would include in all contract documents the SJVUPACD-required Regulation VIII control measures that would require contractors to reduce fugitive dust generation. Implementation of the Regulation VIII fugitive dust control measures would reduce construction fugitive dust emissions associated with the project to a less- than-significant level based on the short-term exposure of any single sensitive receptor to residual fugitive dust emissions. Construction equipment,on-road heavy-duty trucks and construction-worker commute vehicles would also generate criteria air pollutant emissions. Heavy-duty trucks would be used to transport excavated soil materials from the construction area to off-site disposal or deposition sites to be determined by the contractor and to bring in imported fill material to the sites to replace the excavated soils. Emissions from construction-worker commute trips would be minor compared to emissions from heavy-duty trucks. Criteria pollutant emissions of ROG and NOx from these emissions sources Stockton Scavenger Transfer Station Erpansion III.B.11 ESA/990190