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III. Air Quality <br /> <br />Effects: Emissions generated by construction equipment <br />are very minor when compared with the total emissions <br />released in Orange County and are not significant. <br />since the emissions projected for the project are such a <br />small fraction of regional and area emissions, there <br />will be no significant regional or receptor air quality <br />impacts. Vehicle related emissions due to the project <br />are not expected to exceed 1-hour or 8-hour standards. <br /> <br />Mitigation: Specific measures contained in the AQMP for <br />the basin will be incorporated into the proposed <br />project. <br /> <br />C® <br /> <br />Finding: The mitigation measure referenced above will <br />reduce project-related impacts associated with vehicle <br />emissions to a level of insignificance. <br /> <br />GEOLOGY AND SOILS <br /> <br />Effects: Site soils have high potential for <br />compressibility, collapsibility and expansion. Project <br />implementation will involve excavations up to 20 feet below <br />grade. Several known active faults in the southern <br />California area are capable of producing ground shaking on <br />the project site. <br /> <br />Mitigations Subsurface exploration sampling and testing <br />shall be conducted. Densification techniques shall be <br />performed on site soils and constant moisture content <br />maintained. Soils shall be over excavated and recompacted. <br />Chapter 23 of the Uniform Building Code shall be adhered to. <br /> <br />Finding: The mitigation measures described <br />completely mitigate impacts related to <br />instability; project-related excavations; and, <br />instability due to ground shaking. <br /> <br />above will <br />site soil <br />structural <br /> <br />VI. MYDROLOGY AND DRAINAGE <br /> <br />Effects: Increased erosion and sediment transport in <br />surface waters due to construction. Increase in urban <br />pollutants in runoff from vehicular activity. Increased <br />site runoff. Subterranean structures coul~ intercept <br />groundwater. <br /> <br />Mitigation: Conformance with surface runoff pollution and <br />sediment control features established by SCAG, Regional <br />Water Quality Control Board and policies of the City of <br />Santa Ana. <br /> <br />-3- <br /> <br /> <br />