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8.B. - Page 35 <br /> Operational(Long-Term) Air Quality Impacts <br /> The BAAQMD screening table shows that operation of a residential development results in NOX <br /> exceeding its respective threshold before ROG, PM2.5 or PMIO. The BAAQMD screening level for <br /> operational emissions related to a single-family residential development is 325 dwelling units (at <br /> which point NOX may exceed the 10 tons per year or 54 pounds per day threshold). According to the <br /> screening levels established in the BAAQMD CEQA Guidelines the project,which is substantially <br /> smaller than the screening level,would not result in significant long-term air quality impacts or result <br /> in a cumulatively considerable net increase of criteria pollutants for which the region is classified as <br /> non-attainment. (Less Than Significant Impact) <br /> Construction (Short Term) Air Quality Impacts <br /> The BAAQMD has adopted screening level thresholds for daily emissions of criteria/precursor <br /> pollutants related to construction. The BAAQMD screening table shows that construction of a <br /> residential development results in ROG exceeding its respective threshold before NOX, PM2.5 or PMIO. <br /> The BAAQMD screening level for emissions related to construction of a single-family residential <br /> project is 114 dwelling units (at which point ROG may exceed the 10 tons per year or 54 pounds per <br /> day threshold). Given that the proposed project is substantially smaller than the screening thresholds, <br /> project construction activities would not generate significant amounts of criteria/precursor air <br /> pollutants that would impact sensitive receptors or temporarily increase local pollutant levels. The <br /> project would not,therefore, result in significant short-term air quality impacts related to construction <br /> emissions. (Less Than Significant Impact) <br /> According to the BAAQMD CEQA Guidelines, emissions of ozone precursors (ROG and NOx) and <br /> carbon monoxide related to construction equipment are already included in the emission inventory <br /> that is the basis for regional air quality plans and, as such, construction of the proposed proj ect would <br /> not impede regional attainment or maintenance of ozone and carbon monoxide standards in the Bay <br /> Area. (Less Than Significant Impact) <br /> Construction equipment and heavy-duty truck traffic generates diesel exhaust,which is a known <br /> TAC. Health risks from TACs are a function of both concentration and duration of exposure. Full <br /> build-out of the project would take less than one year with demolition work taking approximately <br /> two days, grading activities taking one to two weeks, foundation work and framing requiring <br /> approximately two months, and interior/exterior finishing and landscaping activities taking a <br /> ma�mum of ten months. Construction diesel emissions are temporary, affecting an area for a period <br /> of days or perhaps weeks. The project is relatively small and associated construction activities would <br /> be short in duration. Health risks from construction emissions from diesel particulates would, <br /> therefore,be a less than significant impact. (Less Than Significant Impact) <br /> While the project is below BAAQMD construction screening levels,the close proximity of the <br /> project site to adjacent residences could result in temporary impacts to nearby residents from <br /> increased dustfall and locally elevated levels of particulate matter(PMio and PM2.5) downwind of the <br /> project site. <br /> Impact AIR-1: Construction-generated dust would result in a short-term significant air <br /> quality impact. (Significant Impact) <br /> Miti�ation Measures: The project includes the following mitigation measure,based on BAAQMD <br /> best management practices,to reduce project construction dust impacts to a less than significant <br /> level: <br /> 1410 Valota Road Residential Project 23 Initial Study <br /> Redwood City January 2012 <br />