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• • <br />land use and increased impervious surfaces and the potential to exacerbate already <br />degraded water quality conditions of the Upper Galveston Bay (including the <br />Taylor Lake/Clear Lake system); <br />^ effects of increasing impervious surfaces on the potential for increasing the risk of <br />flooding off-site. <br />Each impact will be evaluated at a qualitative level, but will also be quantified where <br />existing data allows for such an evaluation. <br />AIR QUALITY <br />The Bayport Terminal Project is located in an air basin that is a "severe" non-attainment <br />area for ozone, and last year, registered worse air quality readings than California's South <br />Coast Air Basin. The Texas ~latural Resource Conservation Commission ('I'NRCC) is <br />responsible for managing air quality in the region and guides efforts to attain the <br />standards. The affected air resources environment will be characterized using the <br />information described below. This data will be acquired with the assistance of the <br />Association. <br />^ description of historical ambient ozone levels and climate data from the TNRCC; <br />^ description of ambient air toxic contaminant conditions (all criteria air pollutants <br />including fine particulates); <br />^ description of regional plans for attainment of ozone standards including the recent <br />attainment demonstration, or State Implementation Plan (SIP) revision, for the <br />Houston/Galveston area adopted in October 1999; and <br />^ description and mapping of sensitive air quality receptors in the project vicinity <br />and location of ambient air quality monitors. <br />Potential impacts that would be associated with construction or operation of the Bayport <br />Terminal Project that will be evaluated include: <br />increased emissions caused by construction of the project and long-term operation <br />of diesel truck traffic, shipping engines, locomotives, employee vehicles, and <br />stationary equipment. Emissions of ozone precursors (hydrocarbons and nitrogen <br />oxides), particulate matter, and sulfur-containing compounds will be quantified. <br />The analysis will account for the long-distance truck and rail trips that will be <br />associated with increased container transport. This analysis will rely on use of the <br />U.S. EPA's AP-42 mobile source emission factors tables and the MOBILEx <br />emission factor model. If U.S. EPA data is unavailable for estimating emissions, <br />appropriate emission factors developed by the California Air Resources Board <br />(GARB) will be used. <br />M:~APPROACH. WPD 3 <br />