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INITIAL STUDY <br /> (CONT'D) <br /> SII-91-15 <br /> NOTE: The project known alternately as the River Oaks, or <br /> Diamond Bar Subdivision (SU-91-15) , has been analyzed for its <br /> potential environmental impacts by Environmental Impact Report <br /> (EIR) No. ER-90-3. That EIR, which also analyzed the impacts <br /> associated with the accompanying General Plan Map Amendment <br /> application (GP-90-5) and Zone Reclassification application (ZR-90- <br /> 5) , concluded that the project would result in significant, <br /> unavoidable adverse impacts in the following areas: 1) the <br /> conversion and subsequent loss of 124 .73 acres of agricultural f <br /> grazing land to urban uses, 2) the loss of oak trees and oak !� <br /> woodland habitat, and 3) the disruption of the Swainson's hawk <br /> nesting and breeding habitat may discourage the site's pair of <br /> hawks from returning to the nest, 4) exceeding threshold limits for <br /> carbon monoxide, ozone, and PM-10 and would contribute to County- <br /> wide and regional air quality problems, and 5) the cumulative <br /> impacts to State Route 88/12 due to increased vehicular traffic. <br /> The first is no longer considered significant, due to the Board's <br /> approval of the earlier General Plan Map Amendment application and <br /> the third requires the implementation of the California Department <br /> of Fish and Game's mitigation measures in order for the project to <br /> proceed. In approving the General Plan Map Amendment and Zone <br /> Reclassification applications, the Board of Supervisors certified <br /> the Final EIR and adopted both "Findings of Significant <br /> Environmental Impact" and "Statements of Overriding <br /> Considerations. " <br /> Initial Study (Rev:01/91) <br /> 10 <br />