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equipment used during the construction activities within the EDZ area be equipped with engines that meet or exceed either U.S. Environmental Protection Agency or California Air Resources Board Tier 2 off-road emission standards, and are fitted with Level 3 Verified Diesel Emissions Control (VDEC), which would reduce diesel particulate emissions by at least 85 percent; or ensure that off-road diesel -powered construction equipment engines meet interim or final Tier 4 emission standards. Site(s) affected: All sites within the proposed Zone located within 1,000 feet of sensitive receptors such as church, school, senior housing, recreational, or other sensitive uses. (Draft SEIR, pp. 4.B-14 to 4.B-18.) Impact 4.B-4 Operation of uses that would be developed within the area of the proposed Zone would expose sensitive receptors to substantial concentrations of toxic air contaminants or respirable particulate matter (PM2.5). The SEIR evaluates the impacts related to the exposure of sensitive receptors, such as senior housing or outdoor recreation within the proposed Zone, in close proximity to sources of toxic air contaminants (i.e., within 300 feet of a fuel station or within 1,000 feet of warehouse loading docks or Highway I-680). Significance Before Mitigation: Significant Significance After Mitigation: Less than Significant Finding: Changes have been incorporated into the proposed Zone that would avoid the significant environmental effect as identified in the SEIR. Mitigation Measure 4.B-4, which has been incorporated into the proposed Zone, will reduce the significant environmental impact to a less -than -significant level. Facts in Support of Finding: The following facts and mitigation measure indicate that the impact will be reduced to less than significant. 1. Some of the sites within the proposed Zone that would be developed are within areas of concern related to TAC emissions from one or more stationary TAC sources. On -road vehicular traffic on nearby highway segments and arterials could also expose receptors within the area of the proposed Zone to TAC sources. 2. Implementation of Mitigation Measure 4.B-4 set forth in Table 6-1 of the Final SEIR and listed in the MMRP will ensure that Impact 4.B-4 would be reduced to a less -than -significant level, and is hereby incorporated by reference and described below. Mitigation Measure 4.B-4: If a new sensitive residential use, such as senior housing or a child-care or healthcare facility, is proposed within the EDZ area and within 300 feet of a fuel station or within 1,000 feet of warehouse loading docks or 19