Discretionary development projects that will generate construction-related air emissions shall be required to include the following types of emission reduction measures and potentially others, as recommended by VCAPCD in its Air Quality Assessment Guidelines or otherwise, to the extent applicable to the project as determined by the County: maintaining equipment per manufacturer specifications; lengthening construction duration to minimize number of vehicle and equipment operating at the same time during the summer months; use of Tier 3 at a minimum, or Tier 4 if commercially available diesel engines in all off-road construction diesel equipment; and, if feasible2 using electric-powered or other alternative fueled equipment in place of diesel powered equipment..
2. “Feasible” means that this mitigation measure shall be applied to future discretionary projects under the 2040 General Plan when and to the extent it is “capable of being accomplished in a successful manner within a reasonable period of time, taking into account economic, environmental, legal, social, and technological factors” as determined by the County in the context of such future projects based on substantial evidence. This definition is consistent with the definition of “feasible” set forth in CEQA (Pub. Res. Code, § 21066.1) and the CEQA Guidelines section 15164). The County shall be solely responsible for making this feasibility determination in accordance with CEQA