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Level of Significance After Mitigation: Implementation of Mitigation Measure 4.4-2a would reduce the traffic safety impacts for Altematives 9, 2 and 3 to a less-than-significant level. Impact 4.4-3 Cumulative Effects on Intersection LOS The cumulative effects of each of the alternatives on intersection LOS are.shown in Table 4.4-5. Under cumulative conditions, the SR 132/Koster Road intersection would operate at an unacceptable LOS during the AM Peak Hour (LOS F). This condition would occur in both the north and southbound directions without any of the project alternatives (as !� shown under the. No Project Alternative in Table 4.4-5). A discussion of cumulative i impacts under each alternative is provided below. The effectiveness of the proposed mitigation measures'at intersections adversely affected by the alternatives is demonstrated .` in Table 4.4-6. � I Alternative 1: Prol2osed Project and A : Proposed Project with Alternate Northern Access Road j The SR 132/Koster Road intersection would operate at LOS F during the AM peak hour !� in 2017 without Alternatives 1 and 2. There would not be sufficient gaps in the SR 132 �I traffic during the AM peak hour to accommodate side street traffic from Koster Road. The 4 proposed project would add traffic to this intersection. resulting in increased delays for side i street traffic. The potential result of this defic,ency could be the tendency for side street traffic drivers to become frustrated and attempt to enter SR 132 an P anyway, potentially i resulting in an increased number of accidents The cumulative effects of adding Alternative 1 and 2 traffic to this intersection would be significant. x Altern___Jive 3: Proposed Project with Bird Road A=ss to New Interchancie The intersection of the southbound 1-5 Vernalis interchange ramps with relocated Bird l Road was analyzed as an unsignalized intersection. With stop sign control, the intersection would operate at LOS F without Alternative 3. There would not be sufficient gaps in Bird Road traffic during the AM peak hour to accommodate traffic from the j { : interchange off-ramp. Alternative 3 would add traffic to this intersection resulting in , increased delays for off-ramp traffic. The cumulative effects of adding Alternative 3 traffic to this intersection would be significant. Alternative 4: No-Project Under the No Project Alternative, no mining or excavation activities are proposed and it is 7 assumed that existing land uses (agricultural/residential) at the project site would continue. As a result, this alternative would not contribute new traffic to surrounding roadway segments or intersections, and would therefore not contribute to the cumulative conditions of the study area. This is a less-than-significant impact. r^ Draft Environmental Impact Report 4-51 ER-96-3