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- � ' Cuero IV- �J VHr Li UU i 1 KHL ILL NO: 559-221-4269 #350955 PAGE: 3/3 <br /> Mr.Matti) July 6,2006 <br /> RMC Pacific Vernalis Quarry Pape 2 <br /> • The Diesel Particulate Matter (DPM) emissions were analyzed using both a 70-year and 20-year <br /> lifespan. The District recommends using a 70-year lifespan for residents and a 40-year life span J-5 <br /> for workers. <br /> Although the DPM emissions were analyzed using the Office of Environmental Health Hazard <br /> Assessment (OEHHA) risk factors, the Hot Spots Analysis and Reporting Program (HARP) was <br /> not used to model the health risk The District recommends use of the latest version of the HARP J-6 <br /> released by the Air Resources Board because it is the only software that is compliant with the _ <br /> OEHHA guidelines. <br /> Toxic Air Contaminant (TAC) risk impacts from different project emission sources were run <br /> Individually. The emissions from asphalt plant, concrete plant and DPM Impacts need to be runI J-7 - <br /> concurrently. <br /> The toxic emission factors in Appendix D were not Identified. The emission factors for the J_8 <br /> concrete batch plant and aggregate processing are needed. <br /> • The CALINE4 dispersion model was used to quantify the risk from mobile emissions. CALINE4 <br /> should only be used to analyze carbon monoxide impacts. The AERMOD dispersion was used to J-9 _ <br /> quantify the risks from other sources. The District recommends that AERMOD be used to model <br /> all risks. <br /> The met data was not included in the DEIR. Also, data gap filling in the met data was not <br /> discussed in the analysis. This Information is necessary for the District to verify the adequacy of I J-10 <br /> the met data and modeling. <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) 230-5818 or Mr. Dave Mitchell, Planning Manager, at (559) 230-5800 <br /> and provide the reference number at the top of this letter. <br /> Sincerely, <br /> Jessica R. Willis <br /> Air Quality Specialist <br /> Central Region — <br /> c: file <br />