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Cemex Vemalis Quarry Mining and Reclamation Project Response to Comment B-53 Commenter states that since the San Joaquin Valley air basin is classified as "severe nonattainment"for the state and federal ozone standard and "serious nonattainment"for the federal PMIO standard, that the Project will increase the emission of ozone precursors (ROG, J NOx)and PMl0 and PM2.5, thus causing or contributing to violations ofambient air quality standard, resulting in a new significant impact that was not disclosed in the Draft EIR. The proposed project was found to have significant air quality impacts related to ROG(short term),NOx,and PM (cumulative). This impact is discussed in the DEIR(Impacts 4.6.2 and 6.4). Response to Comment B-54 Commenter argues that the failure of the San Joaquin Valley air basin to meet ozone standards, and the public health threat presented by ozone pollution, mark ozone as a type of pollutant to be analyzed for both its project-specific and cumulative impacts, and that the Draft EIR must be revised to fully analyze,disclose to the public,and mitigate increases in owne-precursor emissions. Ozone is discussed on page 4.6-4. The DEIR identifies contribution to ozone precursors as both a _ direct and cumulative impact(Impacts 4.6.2 and 6.4). This is not a new or substantially different impact than described in the DEIR. Response to Comment B-55 Commenter states that construction and operation of the Project would increase PMI0 and _ PM2.5 emissions and that the DEIR did not evaluate the air quality impacts of the Project on ambient concentrations ofPM10 and PM2.5. See Response to Comment 13-10. Response to Comment B-56 Commenter states that the DEIR's analysis of odor impacts based on estimating the ambient concentration of hydrogen suode (H2S)is incorrect for three reasons: • H2S is only one of many compounds in asphalt plant emissions that cause malodors. The Draft EIR should be revised to include a Dilution-to-Threshold("D/T)analysis for the _ asphalt plant and recirculated for review. • the Draft EIR relied on the California H2S air quality standard as a nuisance threshold for purposes of determining significance of odors. Commenter references studies by the World Health Organization ("WHO')and CARE, and states that "it is now well known that the nuisance odor threshold for H2S is much lower than the state standard and also — much lower than the maximum concentration measured in the Draft EIR's study,"making the project's odor impacts significant and therefore must be mitigated Cemex Vernalis Quarry Mining and Reclamation Project 3-20 ESA 1203015 Final Environmental Impact Report June 2008