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7.2 SIGNIFICANT AND UNAVOIDABLE IMPACTS 7.2.1 INTRODUCTION _ Consistent with the requirements of Section 15126.2(6) of the State CEQA Guidelines,this section identifies the significant and unavoidable impacts of the proposed College Park project, as well as the significant and unavoidable cumulative impacts, that could not be eliminated or reduced to a less-than-significant level by feasible mitigation measures. 7.2.2 SUMMARY OF SIGNIFICANT AND UNAVOIDABLE IMPACTS The significant and unavoidable potential impacts of the proposed project are discussed in Chapter 4, "Environmental Setting,Impacts, and Mitigation Measures,"while the significant and unavoidable cumulative impacts of the project are discussed in Chapter 6,"Cumulative Impacts." The significant and unavoidable impacts identified in each of these chapters are summarized below. Land Use and Agriculture—Direct Conversion of Important Farmland.The proposed project would result in the direct conversion of approximately 760 acres(730 on the College Park project site and 30 acres on the Pombo property) of Important Farmland(Prime Farmland and Farmland of Local Importance) to urban land uses. Transportation—Effects on 2025 Cumulative With-Project Conditions on Anticipated Network.This scenario evaluates the traffic impact on the roadways in the project vicinity from the buildout of the proposed project and the remaining portions of the MHMP in the cumulative 2025 scenario.Under the cumulative 2025 scenario, some of the arterials in the project vicinity are projected to operate at an unacceptable LOS.Without mitigation,traffic impacts on these roadways would be significant.With implementation of the mitigation adopted previously for MHMP development, however,traffic effects on all but two of the arterial segments evaluated would be less than significant. Altamont Pass Road west of Grant Line Road would still be projected to operate at LOS F,resulting in a significant and unavoidable impact.This result is consistent with the results of the MHMP EIR. Also,Byron Road east of Grant Line Road is projected to operate at LOS D, while the current acceptable standard for this roadway segment is LOS C. This segment was not projected to operate at an unacceptable LOS in the MHMP EIR.The effect on this segment would be potentially significant.In addition, several freeway segments in the project area are projected to operate at LOS F,as found in the MHMP EIR. Air Quality—Potential Generation of Toxic Air Contaminants.The proposed project could include the demolition or renovation of existing structures that contain asbestos,resulting in an exposure hazard from the .s airborne entrainment of asbestos. In addition,the proposed project could include the use of diesel-fueled vehicles that could result in the generation of diesel PM emissions that exceed SJVAPCD significance thresholds. Air Quality—Increased Long-Term Regional Emissions of Criteria Pollutants.Implementation of the College Park project would result in increases in long-term regional emissions,primarily associated with mobile sources that would exceed SJVAPCD's recommended significant thresholds of 10 TPY for ROG and 10 TPY for NOx. Visual Quality—Alteration of Visual Character along Grant Line Road from Tree Removal.The proposed project would result in the removal of approximately 188 mature trees along Grant Line Road, altering the visual character along this roadway. Cumulative Toxic Air Contaminants.The proposed project would result in significant and unavoidable air quality impacts in terms of toxic air contaminants(TACs).TACs could result from the demolition or EDAW College Park at Mountain House Spec'rfic Plan III Draft EIR Other CEQA-Required Sections 7-4 San Joaquin County