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Kathy Allen June 13, 2006 PA-0600190(SA);Chatfield Construction;10800 E. State Route 120 Hwy;APN 228-030-24 Page 4 - Off road trucks should be equipped with on-road engines when possible. - Minimize obstruction of traffic on adjacent roadways. • Construction equipment may be powered by diesel engines fueled by alternative diesel fuel blends or Ultra Low Sulfur Diesel (ULSD). The California Air Resources Board (CARB) has verified specific alternative diesel fuel blends for NOx and PM emission reduction. Only fuels that have been certified by CARB should be used. Information on biodiesel can be found on CARB's website at http://www.arb.ca.g_ov/fuels/diesel/altdiesel/altdiesel.htm and the EPA's website at http://www.epa.gov/oms/models/biodsl.htm. The applicant should also use CARB certified alternative fueled engines in construction equipment where practicable. Alternative fueled equipment may be powered by Compressed Natural Gas (CNG), Liquid Propane Gas (LPG), electric motors, or other CARB certified off-road technologies. To find engines certified by the CARB, see their certification website http://www.arb.ca.gov/msprog/offroad/cert/cert.php. For more information on any of the technologies listed above, please contact Mr. Chris Acree, Senior Air Quality Specialist, at (559) 230- 5829. • Construction equipment may be used that meets the current off-road engine emission standard (as certified by the CARB), or be re-powered with an engine that meets this standard. Tier I, Tier II and Tier III engines have significantly less NOx and PM emissions compared to uncontrolled engines. To find engines certified by the CARB, see http://www.arb.ca.qov/msprog/offroad/cert/cert.php. This site lists engines by type, then manufacturer. The "Executive Order" shows what Tier the engine is certified as. Rule 9510 requires construction exhaust emissions to be reduced by 20 percent for NOx and 45 percent for PM10 when compared to the statewide fleet average or to pay an in lieu mitigation fee. For more information on heavy-duty engines, please contact Mr. Thomas Astone, Air Quality Specialist, at (559) 230-5800. District staff is available to meet with you and/or the applicant to further discuss the regulatory requirements that are associated with this project. If you have any questions or require further information, please call me, Chris Kalashian at (559) 230-5818, or Mr. Dave Mitchell, Planning Manager, at (559) 230-5807, and provide the reference number at the top of this letter. Sincer ly, M Chris J. Kal shian Air Quality Specialist Central Region C: file