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Quarry Site Emissions at the proposed quarry site would consist of exhaust from mobile earthmoving equipment and haul trucks, and fugitive dust from unpaved haul roads and extraction activities. Estimates of the emission rates from these sources are summarized in Table 3.5-2. The calculations and assumptions used for the emissions estimates are contained in Appendix B. The estimated emissions are compared in Table 3.5-2 to the APCD trigger levels for environmental review. The estimated emissions, except for NOx, are well below these trigger levels, indicating a level of emissions that would be less-than-significant. The NOx emissions were slightly above the EIR trigger level; however, by an insignificant amount. Furthermore, the NOx emission factors are worst-case emission factors that would be conservative for estimating emissions. Therefore, there would not be any significant impacts from extraction activities, if the recommended mitigation measures for controlling fugitive dust are implemented. Processing Facility Existing emissions at the processing facility are described in a general manner in section 3.5.1. The proposed project would not change any of the existing operations at the processing facility, i.e., the quantity of material processed would not change and the resulting emissions would not change. The existing emissions from the processing facility are already acceptable and permitted by the APCD (except for the fugitive dust violations); therefore, if the applicant brings the facility into compliance with the fugitive dust permit requirements, there would be no significant impact since there would be no change in emissions. Mobile source emissions associated with truck traffic to and from the site would continue at their current level since the volume and type of trucks associated with the proposed quarry are the same as existing conditions. Proposed Regulation VIII - Fugitive Dust It should be noted that a new APCD regulation relating to fugitive dust (Regulation VIII, Fugitive Dust) was proposed in January 1990 that would impose stricter conditions on the processing facility and the proposed extraction site. The purpose of the proposed regulation is to reduce the amount of particulate matter 77