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Level of Significance After Mitigation: Significant Impact 4—Traffic Signal Warranted at the Bird Road/SR-132 Eastbound Ramps Intersection The year 2027 base conditions operational analysis indicated that the SR-132 eastbound ramps/Bird Road intersection geometries will provide sufficient capacity at acceptable Levels of Service. The traffic study prepared in support of the interchange project,however, identified that a traffic signal would be warranted by the year 2027 at this intersection. This is a less-than-significant impact with mitigation. — Mitigation Measure 4 The installation of a traffic signal at the Bird Road/SR-132 eastbound ramps intersection is not warranted when the interchange is first constructed and open for use, and is not projected to be warranted for at least 15-20 years. As such,the traffic signal will not be installed as part of the interchange project but would be — installed when traffic or safety warrants its' installation. Level of Significance After Mitigation: Less-Than-Significant Impact 5—Structural Damage to Existing County Roadways Traffic forecasted for the year 2027 base condition would increase the structural section T.I. resulting in — impacts to the structural sections on Bird Road, Blewett Road and Koster Road within the study area. This is a significant impact which can be reduced to less than significant with mitigations. Mitigation Measure 5 To mitigate the year 2027 base condition would require reconstructing Koster Road from SR-132 south to Blewett Road to provide a 32-foot paved roadway surface with 50 feet of right of way according to the County's typical rural road sections. The roadway structural section would need to be designed based on a calculated T.I. of 9.5. The existing conditions T.I. and the year 2007 base conditions T.I. was calculated _ at 9.0. Reconstruct Blewett Road segments that are less than the County's rural road standard between Koster — Road and Bird Road to provide a 32-foot paved roadway surface with 50 feet of right of way according to the County's typical rural road sections. The roadway structural section would need to be designed based on a calculated T.I. of 11.5. The existing conditions T.I. was calculated at 9.0 and a T.I. value of 9.5 was calculated for year 2007 base conditions. _ Add an AC lift on Bird Road north of Blewett Road sufficient to accommodate a calculated T.I. of 12.5. The existing conditions T.I. and the year 2007 base conditions T.I. was calculated at 10.5. Level of Significance After Mitigation: Less-Than-Significant TRANSPORTATION AND CIRCULATION IMPACTS — YEAR 2027 PLUS PROJECT CONDITIONS Impact 6A—Change in Level of Service on SR 132 between the I-580 and I-5 Interchanges The year 2027 base conditions weave section, ramp junction and mainline peak hour analysis identified — projected Levels of Service with a four-lane freeway between the I-580 and I-5 interchanges that would 2'Draft DeSilva Gates Quarry Trafc&Circulation Analysis 51 October 1005 Jones&Stokes (R905TIS001/15-4000-01)