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t <br /> Ms. Hayes August 3, 2005 <br /> PA-0500467 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 i <br /> - Install wind breaks at windward side(s) of construction areas <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 and/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-term 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 /> • The applicant should use California Air Resources Board (GARB) certified alternative fueled engines <br /> i in construction equipment where practicable. Alternative fueled equipment may be powered by <br /> Compressed Natural Gas (CNG), Propane (LPG), electric motors, or other CARB certified off-road <br /> technologies. To find engines certified by the California Air Resources Board, see their certification <br /> website http://www.arb.ca.-gov/msprog/offroad/Cert/cert.php. For more information on `alternative fuel <br /> engines, please call Mr. Chris Acree, Air Quality Specialist, at(559) 230-5829. <br /> • Construction equipment should have engines that meet the current off-road engine emission standard <br /> (as certified by the California Air Resources Board), or be repowered with an engine that meets this <br /> standard. Tier I and Tier II engines have significantly less NOx and PM emissions compared to <br /> uncontrolled engines. To find engines certified by the California Air Resources. Board, see <br /> htti)://www.arb.ca.gov/msproci/offroad/CerVcert.12hp. This site lists engines by type, then <br /> manufacturer. The "Executive Order" shows what Tier the engine is certified as. For more <br /> information on heavy-duty engines, please contact Mr. Kevin McCaffrey, Air Quality Specialist, at r <br /> (559)230-5831. <br /> District staff is available to meet with you acrd/or the applicant to further discuss the regulatory <br /> requirements that are associated with this project. If you have any questions or require further I <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 /> Borgia tewart <br /> Air Quality Specialist <br /> Central Region <br /> 0: File ! <br /> 1 <br />