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<br /> <br />Red Morton Community Park Sports Lighting Initial Study <br />City of Redwood City 32 June 2015 <br />Table 4.3-1: BAAQMD Thresholds of Significance Used in Air Quality Analyses <br />Pollutant <br />Construction Operation-Related <br />Average <br />Daily Emissions <br />(pounds/day) <br />Average <br />Daily Emissions <br />(pounds/day) <br />Maximum <br />Annual Emissions <br />(tons/year) <br />Risk and <br />Hazards for <br />New Sources <br />and Receptors <br />(Cumulative) <br />Same as <br />Operational <br />Threshold <br /> Increased cancer risk of >100 in one million <br /> Increased non-cancer risk of > 10.0 Hazard Index <br />(chronic or acute) <br /> Ambient PM2.5 increase: > 0.8 µ/m3 <br />[Zone of influence: 1,000-foot radius from property <br />line of source or receptor] <br />Sources: Bay Area Air Quality Management District CEQA Guidelines (updated May 2011) and BAAQMD <br />Revised Draft Options and Justification Report California Environmental Quality Act Thresholds of <br />Significance. October 2009. <br /> <br />4.3.2.1 Operational Air Quality Impacts <br /> <br />The project proposes to install new and replacement sports lighting at a park where sports lighting <br />currently exists. As described previously, the new lighting would be located on Mitchell Field, while <br />replacement lighting would be installed at Betchet/Griffin Field and the tennis courts. Mitchell Field, <br />which currently operates only until dusk, would be allowed to operate until 10:30 PM up to seven <br />days per week with the proposed installation of new sports lighting. The increased hours of <br />operation at Mitchell Field would result in an incremental increase of vehicle trips as patrons drive to <br />and from the park during those hours. These increase vehicle trips would be the primary source of <br />operational air emissions associated with the project. <br /> <br />BAAQMD has developed screening thresholds that define levels of development below which <br />significant operational air quality impacts would not occur. Although there is no screening threshold <br />for sports lighting projects, the vehicle trip generation of the proposed project can be compared to <br />other land uses to determine whether it is below the BAAQMD screening threshold. As described in <br />Section 4.16 Transportation, the project is expected to result in a maximum increase of 275 vehicle <br />trips per day. This is roughly the equivalent to the trip generation of 29 single family residences.9 <br />The BAAQMD screening threshold for single family dwelling units is 325. As a result, operational <br />air quality impacts resulting from the proposed project would be less than significant. <br /> <br />4.3.2.2 Construction Related Impacts <br /> <br />Installation of lights at the park will require minor excavation for the construction of the footings for <br />the light standard poles. Construction activities, such as excavation and grading operations, along <br />with wind blowing over exposed earth would emit exhaust and dust that affect local and regional air <br />quality. Although the proposed project requires only minimal construction, construction dust could <br />affect local air quality and has the potential for creating a nuisance at nearby properties. <br /> <br /> <br /> <br />9 Institute of Transportation Engineers. Trip Generation Manual, 9th Edition. 2012. <br />8.A. - Page 49