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V. ENVIRONMENTAL EFFECTS, MITIGATION MEASURES A~D FINDINGS A. EARTH RESOURCES 1 · ENVIRONMENTAL EFFECTS Implementation of the Main Street Concourse will require grading in order to develop surfaces suitable for the construction of residential and commercial structures, soils exposed during grading will be subject to wind erosion, which could potentially increase the amount of dust in the area. Although soils are currently in moist condition, the hauling of excavated soils could result in dust generation. Approximately 460,000 cubic yards of earth material will be exported from the project site: 300 cubic yards during Phase I, and 160,000 cubic yards during Phase II. As is typical throughout most of Southern California, the project site is subject to sometimes violent shaking from periodic earthquakes. The San Andreas fault lies 43 miles to the northeast of the project site and has the potential to generate an earthquake with a Richter magnitude of 8.3. An event of this size would cause groundshaking intensity of VII (based on the Modified Mercalli Intensity Scale) at the project site. The Newport-Inglewood fault zone lies off the coast of Southern California and extends from Dana Point inland through Newport Beach, Long Beach, Torrance, and up to Beverly Hills. The fault is situated 15 miles to the west of the project site and has the potential Richter magnitude of a 7.0 event. An earthquake of this magnitude will create intensities of VIII at the site. The Whittier fault parallels the Newport-Inglewood fault zone and is located in northeast Orange County. It is approximately 11 miles north of the project site. Recent activity suggests that it has the ability of generating a 7.0 Richter magnitude earthquake. This, too, would result in high intensities (VIII) at the project site. As with contiguous developments, the site is situated within the Santiago and Villa Park Dam inundation areas, 100-year flood zones, and standard project flood areas. In the event of the failure of the Villa Park and Santiago Dams, intense storms, and severe hydrologic conditions, the project site and neighboring developments could be inundated. FINDINGS The mitigation measures contained in the Mitigation Monitoring Program as Mitigation Numbers 1 through 9 have been required in, or incorporated into, the project and those mitigation measures mitigate or avoid the significant environmental effects identified in this EIR and outlined above. Substantial evidence supporting this finding is contained in the record at pages 4-6 and 4-10 of the Revised Draft EIR.