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REV: 06-17-2021 SK <br />B.Air Quality. As previously indicated, the size of the ice rink building would <br />be the same as that previously analyzed in the Draft EIR as the Community <br />Commons Building. Therefore, Consultant anticipates that construction <br />emissions would remain the same as previously disclosed. In addition, the <br />operation of the ice rink would generate air pollutant emissions from the <br />following sources and need to be analyzed by Consultant as follows: <br />Mobile emissions from the increase in traffic associated with the ice <br />rink. Consultant will rely on trp generation and VMT estimates from the traffic <br />consultant (described above) to estimate mobile emissions. Air quality is a <br />regional issue, hence the analysis will consider if the trips generated are <br />new trips in the region or are diverted trips that are currently occurring to <br />other ice rinks in the area, consistent with the VMT assessment described <br />in Subtask 1. Consultant will either modify the previously conducted <br />CalEEMod run to include new trips attributable to the ice risk or will use <br />EMFAC2021 to estimate emissions if the traffic report determines that <br />there would only be a VMT change due to existing trips being made diverted <br />to the Project site. <br />Emissions from possible emergency generators. Consultant will <br />estimate these emissions using factors from the California Air Resources <br />Board’s (CARB) Final Regulation for the Air Toxic Control Measure for <br />stationary engines. The potential ice rink operator has indicated that a <br />generator is likely not required for the use, but if so, there would be many. <br />Self-contained battery packs may be used for emergency egress lighting. <br />However, because the ice rink scenario is conceptual at this time, <br />Consultant will confirm with the potential future ice rink operator and its own <br />review of similar existing facilities the maximum number of generators <br />likely. This approach will ensure a conservative analysis in the EIR. <br />Data Needs: <br />a)Clarification on maximum number, fuel used, and <br />ratings (horsepower) of emergency generators that <br />would be required, if used; <br />b)Confirmed assumption regarding use of self-contained <br />battery packs in lieu of emergency generators, for purposes <br />of this analysis; and <br />c)Confirmed assumptions for use of rooftop solar photovoltaics (PV). <br />Emissions from natural gas powered components of the HVAC <br />system. Consultant will estimate these emissions using estimated annual <br />natural gas usage data and U.S. EPA’s AP-42 emission factors and initial <br />data provided from the potential ice rink operator, which identified the <br />following HVAC equipment fueled by natural gas: <br />ATTY/AGR.2021/Amend No. 4/Environmental Science Associates (ESA) (Page 6 of 9)