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Pages 13-23

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From page 13...
... 13 This guidebook is primarily intended to help air quality analysts identify, collect, and/or develop the data and information necessary to compute GAV emissions. It also is intended to assist specialists (e.g., traffic engineers or planners, airport planners, and others)
From page 14...
... 14 Guidebook for Quantifying Airport Ground Access Vehicle Activity for Emissions Modeling The General Conformity Rule of the Clean Air Act (CAA) also may apply to an airport project if the project is located in an area designated as being either "non-attainment" or "maintenance" for any of the NAAQS (40 CFR 93)
From page 15...
... Emissions Model Data Requirements 15 of GAV data appropriate for one project can differ substantially from what is needed for another project. In the "Traffic Volume" category, for example, a major airport reconstruction or expansion effort may need to incorporate data from existing traffic counts and future forecasts for a substantial number of roadway segments.
From page 16...
... 16 Guidebook for Quantifying Airport Ground Access Vehicle Activity for Emissions Modeling Figure 5-1. Temporal factors.
From page 17...
... Emissions Model Data Requirements 17 Figure 5-2 depicts the three tiers, along with the appropriate project characteristics for determining to which tier a given project should be categorized for purposes of computing GAVrelated emissions. Factors are listed on the left side of the matrix (i.e., federal document type, attainment status, and public interest)
From page 18...
... Table 5-2. Description of tier factors.
From page 19...
... Emissions Model Data Requirements 19 Table 5-3. Airport project/tier assignment.
From page 20...
... Table 5-4. Required GAV data -- Tier I
From page 21...
... Table 5-5. Required GAV data -- Tier II.
From page 22...
... 22 Guidebook for Quantifying Airport Ground Access Vehicle Activity for Emissions Modeling 5.2.2.3 Tier III GAV Data Requirements For those airport projects that require a Tier III analysis (the highest level of analysis using the most precise and customized data) , the collection effort is the most comprehensive, timeconsuming, and resource-intensive.
From page 23...
... Table 5-6. Required GAV data -- Tier III.

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