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i, <br /> Ms.Allen (C October 27, 2005 ' <br /> PA 0500686(UP) Page 4 <br /> Construction activity mitigation measures include: <br /> — Install sandbags or other erosion control measures to prevent silt runoff to public roadways from <br /> sites with a slope greater than one percent. <br /> - Limit area subject to excavation, grading;and other construction activity at any one time- <br /> - Limit the.hours of operation of heavy-duty equipment acrd/or the amount of equipment in use. <br /> — Replace fossil-fueled equipment with electrically driven equivalents (provided they are not run via <br /> a portable generator set). <br /> — Curtail construction during periods of high ambient pollutant concentrations; this may include <br /> ceasing of construction activity during the peak-hour of vehicular traffic on adjacent roadways, and <br /> "Spare the Air Days," declared by the District. <br /> — Implement activity management(e.g. rescheduling activities to reduce short-terra impacts). <br /> — During the smog season (May through October), lengthen the construction period to minimize the <br /> number of vehicles and equipment operating at the same time. <br /> — Off road trucks should be equipped with on-road engines when possible. <br /> — Minimize obstruction of traffic on adjacent roadways. <br /> District. staff is available to meet with you and/or the applicant to further discuss the regulatory <br /> requirements that are associated with this project. If you have any questions or require further <br /> information, please call me at (559) 230-5800 or Mr. Hector R. Guerra,Senior Air Quality Planner, at(559) <br /> 230-5820 and provide the reference number at the top of this letter. <br /> Sincerely, <br /> eorgia A Stewart <br /> Air Quality Specialist <br /> Central Region <br /> C:File <br />