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San Joaquin County Community Environmental Setting,Impacts,and Mitigation Measures Development Department Air Quality Impact Analysis '- Approach and Methodology Impacts on air quality were assessed based on information contained in the SJVAPCD's Guide forAssessing and Mitigating Air Quality Impacts(2002). Construction and operation activities could result in direct and indirect impacts on air quality caused by ground disturbance or vegetation clearing as part of i project construction and/or as a result of project operations. The thresholds of significance found in the State CEQA Guidelines(discussed ... below)were used to determine the significance of these impacts. �. Construction-Related Emissions A review of the District's Guide for Assessing and Mitigating Air Quality Impacts(2002), indicates the SJVAPCD considers PM 10 to be the primary pollutant of concern from construction activities,and compliance with the SJVAPCD Regulation VIII will constitute sufficient mitigation to reduce PMIO emissions to less-than-significant levels. For the CEQA analysis,construction emission estimates were not quantified,as the SJVAPCD requires implementation of effective and comprehensive control measures rather than detailed quantification of emissions(SJVAPCD 2002). The amount of PM 10 emitted during construction activities varies greatly depending on the level of activity,the specific operations taking place,the equipment being operated, soil characteristics, and weather conditions. Despite this variability in emissions, •' experience has shown that several feasible control measures can be reasonably implemented to reduce PMIO emissions during construction. >. The SJVAPCD has determined that compliance with its Regulation VIII Fugitive PMIO Prohibitions, including implementation of all feasible control measures specified in its Guide for Assessing Air Quality Impacts (SJVAPCD 2002), is .. sufficient mitigation to minimize adverse air quality effects from construction. All construction projects must abide by this regulation. Since the publication of the District's guidance manual,the SJVAPCD has revised some of the rules comprising Regulation VIII. Guidance from the SJVAPCD staff indicates that implementation of a Dust Control Plan would satisfy all of the requirements of the SJVAPCD Regulation VIII (Cadrett pers. comm.). This analysis assumes the project Applicant would comply with Regulation VIII through implementation of a Dust Control Plan,which would be sufficient to eliminate any potentially substantial adverse air quality effects generated by construction activities. DeSilva Gates Quarry Project Draft Environmental Impact Report 3.0-9 As 05105.05