4.4. SR 03-15-1999 - Laserfiche WebLink

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. 4.5.2.2 Wetland Impact Analysis The Contractor-will identify wetlands that are likely to be affected by the project and will analyze the impacts to those wetlands. Wetland data to be collected will include vegetation types; observations of fauna inhabiting the area; morphology of each'wetland; an evaluation Qfwetland function; quality and value; and potential project impacts and mitigation. Wetlands will be -classified as defined by the U.S. Fish and Wildlife Service. A voidance of these habitats will be addressed during the study. Coordination with environmental and regulatory agencies will -continue throughout the project's development to avoid and minimize harm to wetlands. No -WET2 analysis will be conducted in this phase. The Contractor will develop conceptual mitigation alternatives, as required, for unavoidable impacts to wetland areas. 4.5.2.3 Biological Assessment Habitats within the project limits having the potential to harbor threatened or endangered species will be identified through field observations. Findings will be documented. Plans for investigating whether threatened or endangered species could be affected will be coordinated with federal, state and local agencies and organized interest groups. 4.5.3 Physical Impact Assessment 4.5.3.1 Air Quality Analysis . The Contractor will collect the data necessary and perform the air quality impact analysis for the proposed alternatives (i.e., park and ride lots, maintenance yards). The Contractor will collect and summarize existing ambient air quality and meteorological data for the study area. Previously developed traffic and air quality studies conducted in the area will also be collected, reviewed, and examined as to their applicability to this study. Air Quality levels will be estimated at each air quality analysis site under each of the proposed alternati ves for the project's first year of operation and its design year. At each of the analysis sites, maximum one- and eight-hour concentrations will be calculated for the AM and PM peak periods. Future air quality levels estimated for this build alternative (for each of the two analysis years) will be compared with National Ambient Air Quality Standards (NAAQS) and predicted no-build levels to determine the effects of each alternative. Assessments will be made of the potential air quality impacts associated with proposed park-and-ride facilities using FT A- approved methodologies. The Contractor will prepare an assessment of the consistency of each alternative with the strategies contained in the applicable parts of the areas SIP. This analysis will include a ,discussion of possible traffic control measures and physical improvements that may be necessary for each alternative to attain air quality standards as specified in the SIP. Potential air pollution mitigation measures will be evaluated for sites where exceedances are estimated. . A mesoscale analysis will be conducted to estimate annual area-wide emissions of CO, NOx, and NMHC under each of the proposed alternatives for the project's first and design years. These emissions will be based on area-wide projections of ADT and corresponding vehicular speeds for each build scenario. The emission burden estimated for each alternative will be compared with Work Program for Northstar Corridor MIS and EIS For the Proposed Commuter Rail Service February 25. 1999 .~. ~-:~ 15 Work Program