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9.0 EIR Subject Areas Requiring No Change in Analysis <br />Avion Project SEIR <br />Page 9-5 <br />9.5 Air Quality <br />The 1998 EIR identified significant direct and cumulative air quality impacts to regional air quality as <br />a result of vehicle traffic and construction-related activities, respectively. Relative to direct <br />(operational) air quality impacts, the 1998 EIR concluded that buildout of the subarea would not <br />conform to the Regional Air Quality Strategy, and impacts would be significant and unmitigated. The <br />project is consistent with the land use and buildout assumptions for the perimeter properties as <br />described in the 1998 EIR; therefore, the project would not result in any new significant or <br />substantially increased adverse impacts beyond those previously identified in the 1998 EIR. <br />The EIR incorporated mitigation measures that would reduce fugitive dust impacts from <br />construction activity. Dust control during construction and grading operations would be regulated in <br />accordance with the rules of the San Diego Air Pollution Control District. Incorporation of these <br />mitigation measures would reduce construction-related air quality impacts to below a level of <br />significance. The project would incorporate such mitigation as described in the 1998 EIR. However, in <br />addition to the land development activities described in the 1998 EIR, the project may require <br />blasting in areas of shallow bedrock. Construction-related air quality impacts associated with <br />blasting are discussed in Section 5.5.3 of the EIR. <br />9.6 Geology and Soils <br />The 1998 EIR states that there are no significant soil or geologic conditions observed or known to <br />exist within the subarea that would preclude implementation of future development. The southeast <br />perimeter parcels are generally underlain by Santiago Peak metavolcanics, which exhibit good <br />bearing and stable slope characteristics, although expansive soils may be encountered. <br />The 1998 EIR concluded that potentially significant geologic conditions exist, which would require <br />mitigation as part of any future tentative maps. The site-specific Geotechnical Report prepared for <br />the project concluded that no soil or geologic conditions exist at the project site that would preclude <br />the proposed development, provided the measures recommended in the report are implemented <br />for design and construction. <br />The City’s Geology Section has reviewed and determined that the site-specific Geotechnical <br />Investigation, which includes recommendations to be followed during project construction, <br />adequately addresses the geologic conditions potentially affecting the project site (Geocon 2018a). <br />Furthermore, implementation of proper engineering design and utilization of standard construction <br />practices to be verified at the building permit stage, in conjunction with implementation of the <br />recommendations of the Geotechnical Investigation, would ensure that the potential for impacts <br />associated with geologic hazards would be less than significant. Therefore, based on the results of <br />the Geotechnical Investigation, there would be no new significant or substantially increased adverse <br />impacts beyond those previously identified in the EIR. <br />The 1998 EIR also concluded that without erosion control measures, there is a potentially significant <br />increased erosion impact associated with the implementation of the Subarea Plan. These impacts <br />would be mitigated to a level below significance by incorporation of appropriate control measures,