New Search
Attachment 2 City of Eugene Contract 2007-00226 <br /> Air Quality Analysis Report Scope of Work Exhibit C <br /> CH2M HILL will conduct an air quality impact analysis and write an air quality technical report <br /> which will follow the guidelines provided in the U.S. Environmental Protection Agenc~s (EPA) <br /> Guideline for Modeling Carbon Monoxide from Roadway Intersections (U.S. EPA, 1992). This is a <br /> two-step process consisting first of estimating vehicle emission factors, and then using a <br /> dispersion model to calculate CO concentrations in the vicinity of the project site. Air quality <br /> impacts will be assessed for existing, opening year no build, opening year one build alternative, <br /> horizon year no build and horizon year one build alternative. <br /> The air quality report will include discussion of the project's inclusion in the state <br /> <br /> I transportation plan, a summary of the existing air quality with respect to National Ambient Air <br /> Quality Standards (NAAQS), discussion of the hot spots analysis, a discussion of intersection <br /> selection, model inputs and assumption for MOBILE 6.2 and CAL3QHC and a discussion of CO <br /> concentrations and backgrounds and a comparison to NAAQS. In addition, a discussion about <br /> PMIO hot spot analysis and Mobile Source Air Toxics (MSAT) will be included in the report. <br /> CO Hot Spots Analysis <br /> A local hot spot analysis will be performed to determine carbon monoxide (CO) concentrations <br /> using the USEPA model CAL3QHC Version 2. Vehicular emissions will be computed using <br /> USEPA's MOBILE 6.2 model. Readily available data will be used for this model and default <br /> values will be assigned when relevant. The intersection selected for the modeling and the <br /> corresponding receptor siting will be based on the Level of Service (LOS). It is assumed that no <br /> <br /> ' more than 3 intersections will require modeling for this project. Potential air quality impacts <br /> will be evaluated at no more than three intersections with LOS of D, E and F intersections that <br /> would be affected by the proposed project: Maximum one-hour and eight <br /> hour CO <br /> concentrations will be estimated for each intersection. Background CO concentrations will be <br /> added and the results will be compared to the NAAQS. The background CO values will be <br /> obtained from Lane Regional Air Pollution Authority. <br /> Conformity <br /> As part of the project level conformity process, CH2M HILL will contact the Metropolitan <br /> Planning Organization (MPO) to verify the status of the project as conforming to the most <br /> recent Regional Transportation Plan and Transportation Improvement Plan. <br /> Mobile Source Air Toxics (MSAT) <br /> MSAT will be addressed according to FHWA's Interim Policy on Mobile Source Air Toxics. This <br /> project will be exempt from MSAT since the estimated Annual Average Daily Traffic for the <br /> year of project completion is anticipated to be less than 150,000, and a qualitative analysis will <br /> be sufficient. A short qualitative discussion of MSAT will be included in the report. <br /> PMio Hot Spot Analysis <br /> According to the guidance document Transportation Conformity Guidance for Qualitative Hot-spot <br /> Analyses in PMzs and PMIONon-attainment and Maintenance Areas, this project is not considered to <br /> be a project of air quality concern. A project of air quality concern would include certain <br /> highway and transit projects that involve significant levels of diesel vehicle traffic. This project <br /> <br />