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Ponderosa Homes at 6900 Valley Trails Drive Initial Study and Negative Declaration of this Initial Study. In view of the court's order, and subsequent decisions, the BAAQMD is no longer recommending that the thresholds of significance from the 2011 CEQA Air Quality Guidelines be used as a generally applicable measure of a project's significant air quality impacts. Although reliance on the 2011 thresholds is no longer required, local agencies still have a duty to evaluate impacts related to air quality and greenhouse gas emissions. In addition, CEQA grants local agencies broad discretion to develop their own thresholds of significance, or to rely on thresholds previously adopted or recommended by other public agencies or experts so long as they are supported by substantial evidence. Accordingly, the City of Pleasanton has been using the BAAQMD's 2011 Draft CEQA Guidelines for thresholds and other guidance to evaluate project impacts in order to protectively evaluate the potential effects of the project on air quality.2 DISCUSSION a-c) The proposed project is expected to generate short-term impacts related to construction activities (e.g., demolition, clearing/grubbing, site grading). Construction activity on the site is required to implement dust control measures (e.g., periodic watering of the site, covering of all trucks hauling soil, sand, and other loose material) to control airborne particulate matter, as standard conditions of approval. Construction equipment is required to meet all current exhaust standards for emissions. These requirements will be conditions of project approval and would reduce construction period emissions to a less-than-significant level. Long-term operational emissions would be generated by both stationary and mobile sources as a result of normal day-to-day activities on the site during operation of the project. Stationary area source emissions would be generated by space (HVAC) and water heating devices and operation of landscape maintenance equipment. Mobile source emissions would be generated by motor vehicles traveling to and from the project site. Based on the 9th Generation of the Institute of Transportation Engineers Trip Generation Handbook, the proposed 36 single-family lot development would generate up to 343 daily trips. These new trips would not exceed the BAAQMD significance standards for mobile source emissions. Therefore, the potential impact would be less than significant. 2 Bay Area Air Quality Management District. California Environmental Quality Act Air Quality Guidelines, May 2011. Updated May 2012. 15