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4. ENVIRONMENTAL ANALYSIS 4.6 AIR QUALITY -- Regulation VIII Fugitive PM 10 Prohibitions, including implementation of all feasible control measures specified in the Valley Air District's Guide for Assessing Air Quality Impacts. The monitor will provide status reports and report all air quality violations to the Port and or the Valley Air District. The following control measures may be required to mitigate significant PM 10 impacts: • Limit traffic speeds on unpaved roads to 15 mph. • Install sandbags or other erosion control measures to prevent silt runoff to public roadways from sites with slope greater than one percent. _ The following additional control measures are strongly encouraged at large construction sites or sites near sensitive receptors: • Install wheel washers for all exiting trucks, or wash off all trucks and equipment leaving the site. • Install wind breaks at windward side(s) of construction sites. • Suspend excavation and grading activity when winds exceed 20 mph. • Limit area subject to excavation,grading, and other construction activity at any one time. The following mitigation measures may be applied to construction sources of combustion: • Use of alternative fueled or catalyst equipped diesel construction equipment. • Minimize idling time. • Limit the hours of operation of heavy duty equipment and/or the amount of equipment in use. • Replace fossil-fueled equipment with electrically driven equivalents (provided they are not run via a portable generator set). • Curtail construction during periods of high ambient pollutant concentrations;this may include ceasing of construction activity during the peak-hour of vehicular traffic on adjacent roads. • Implement activity management (rescheduling activities to reduce short-term impacts). _ Mitigation Measure 4.6.1: Project Construction-Related Emissions Impact This project applicant shall comply with SJVAPCD's Regulation VIII control measures, and shall retain an on-site air quality monitor to ensure compliance with the SJVAPCD's Regulation VIII control measures. The monitor must be familiar with the SJVAPCD Regulation VIII Fugitive — PM 10 Prohibitions, including implementation of all feasible control measures specified in the SJVAPCD's "Guide for Assessing Air Quality Impacts." RMC Pacific vemalis Quarty Mining and Reclamation Project 4.6-20 ESA/203015 Administrative Draft Eni March 2004