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specificity and is incorporated in the SEIR to address GHG emissions. He then discussed the District’s efficiency standard which calculates a standard of emissions based on a per-service population, noting that GHG emissions would have a significant unavoidable impact on the environment. Mike Tassano provided a breakdown of the Four-Lane Concurrent Extension and the Two-Lane Constrained Extension alternatives, noting that staff looked at the intersection model for each alternative (the Pleasanton model) and roadway segments including freeways and arterial segments (the Alameda County model). Commissioner Blank inquired if the original EIR incorporated the “No Stoneridge Drive Extension” and the Emergency Vehicle Access (EVA). Mr. Tassano confirmed that it did. Commissioner Pentin inquired what the acceptable level of service (LOS) is. Mr. Tassano replied that it was LOS E and below. Mr. Tassano continued that when the Alameda County model was used, the EIR stated there were no impacted intersections; however, at the beginning of the SEIR work, staff reviewed all the data and found an error in one of the projects for the Santa Rita road- link segment, which then identified Santa Rita South of I-580 as having a significant and unavoidable impact. He then briefly discussed the Two- and Four-Lane alternatives and their impacts in terms of the Alameda County and Pleasanton models. Commissioner Blank inquired why opening four lanes would impact I-580 but not having the lanes would not. Mr. Tassano explained that when the roadway is opened to the south, traffic is improved at El Charro Road and now moves farther to the east, thus creating an impact on I-580. Commissioner Blank inquired if a different segment of I-580 was impacted. Mr. Tassano replied that was correct and this is how the other four work, as well. He continued to describe the Two-Lane Constrained alternative and the Alameda County models of the link segments for the freeway and arterial segments, stating that there are no segments impacted and that the Santa Rita Road south of I-580 impact is also removed. He clarified a discrepancy between the Summary and Alternatives sections regarding whether or not mitigation is required in the Two-Lane alternative for the Santa Rita Road at Stoneridge Drive intersection and indicated that the asterisk in the Summary section should be deleted. He indicated that this would be corrected in the Final EIR. Commissioner Blank inquired if calculations are impacted by whether or not Dublin and Livermore implement their mitigations. PLANNING COMMISSION MINUTES, December 9, 2009 Page 5 of 12