8F Consent 2007 0618 - Laserfiche WebLink

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III. AIR QUALITY - Where available, the significance criteria established by the applicable air quality management or air pollution control district may be relied upon to make the following detenninations. Would the project: a) Conflict with or obstruct implementation of the applicable air quality plan? b) Violate any air quality standard or contribute substantially to an existing or projected air quality violation? c) Result in a cumulatively considerable net increase of any criteria pollutant for which the project region is non-attainment under an applicable federal or state ambient air quality standard (including releasing emissions which exceed quantitative thresholds for ozone precursors)? d) Expose sensitive receptors to substantial pollutant concentrations? e) Create objectionable odors affecting a substantial number ofpeop]e? DISCUSSION: Potentially Significant Impact Potentially Significant unless Mitigation Incorporated Less than Significant Impact No Impact o o o o ~ The project site is located in Alameda County within the San Francisco Bay Area Air Basin, which is a designated "non-attainment" area for the federal and state ozone standards and for the state particulate matter standard. Air quality impacts of the project would result from short-term construction activities. o o ~ o Regarding short term air quality impacts, construction activities associated with the proposed trail and bridge would generate a small amount of truck and employee vehicle trips on local roads. Exhaust from these truck and employee vehicle trips would generate emissions, including reactive organic gases (ROG), carbon monoxide (CO), nitrogen oxides (NOx), and particulate matter (PMlO) emissions. Construction of the trail and bridge is expected to take approximately four months, using up to 20 employees per day. Approximately 260 trucks (or 520 trips) would be required to deliver construction materials to the site or remove excavated materials over the four-month period. The combined auto and truck trips would result in insignificant emissions, since the construction project is relatively small and would be completed over a four-month construction period. o ~ Some shallow grading on the existing levee may be required prior to the installation of the asphalt trail. Grading and drilling of the levees on either side of Oyster Bay Slough would be required for the bridge footings. Soil disturbance caused by construction activities would be exacerbated by wind erosion. As aresult, short-term dust emissions would cause a temporary increase in localized PMlO emissions. The highest potential for dust impacts would occur when the soils are dry, during the late Y4204IS.00693.doc - 4/5/07 o o ~ o o o o ~ o -]0-