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f ~ C ~_ would be allowed within the Caltrans safety zones identified in the Draft Airport Land Use Compatibility Plan: • Medium to Large indoor assembly room (greater than 300 people and less than 1,000 people) • Low Capacity indoor assembly room (less than 300 people) • Medium outdoor assembly area (greater than 300 people and less than 999 people) • Small outdoor assembly area (greater than 50 people and less than 300 people) The safety zones recommended by Caltrans suggest the Ice Center Alternative may have the potential to create safety risks at the project site due to its proximity to the Livermore Airport. However, as stated on page 3.4-19 of the DEIR, an assessment of the potential for aircraft accidents at the Staples Ranch site was conducted in 1994 by Charles Salter Associates. Data was applied to the Livermore Municipal Airport taking into account the airport's projected volume of operations and proximity to the Staples Ranch site. The report determined that there would be a low potential frequency of aircraft crashes on the site (identified as once every 712 years). Consequently, the report concluded that the risk of death or injury on the ground would be considered less than significant. This same conclusion applies to the Ice Center Alternative. Traffic: The EIR determined that the environmental impacts of the Ice Center would be slightly greater than the proposed project, because of additional trips particularly during the PM peak hour; however, these additional trips did not result in additional intersection or roadway impacts beyond those identified for the proposed project. Water Quality: The increase in runoff and conversion of land use from parks under the proposed project to the ice center under this alternative would increase mean annual runoff from the site and slightly alter the amount of pollutants in stormwater runoff. Changing pollutant loads and increased runoff would result in a higher mean annual pollutant load for the Ice Center Alternative compared to the proposed project. The Ice Center Alternative would have a potentially substantial increase in pollutants loads compared to the proposed project. Even slight increases (more than 5 percent) are considered potentially substantial because the proposed project already increases pollutant loads substantially compared to existing conditions. Nevertheless, implementation of Mitigation Measures HY-1.1 and HY-1.2 recommended for the proposed Stoneridge Drive Specific Plan Amendment and Staples Ranch Project Environmental Impact Report Findings and Statement of Overriding Considerations Page 9 of 30