Criteria for Evaluating Project |
Pollutants |
Comments |
CO |
PM (PM10 and PM2.5) |
MSATs |
GHG (CO2) |
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Regulatory Basis |
NEPA, Conformity Rule |
NEPA, PM Hotspot Conformity Rule |
NEPA, FHWA MSAT Guidance |
State Regulation only |
No Federal regulations for GHG |
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Criteria defining analysis approach |
Defined by EPA, FHWA 1986 Memo |
AADT, diesel % of fleet |
AADT, diesel % of fleet, receptor distance |
Defined by State |
Variables, thresholds used to select analysis approach |
AADT Volume |
Defined by LOS? |
125, 000 |
140, 000 – 150, 000 |
Defined by State |
Is AADT or LOS a better criteria? IAC Consultation |
Percent Diesel Traffic |
Not defined |
8% |
High diesel volumes (>8% ?) |
Defined by State |
Defined by IAC Consultation |
Receptor Sensitivity or Population Proximity |
30 feet from pavement |
Not defined |
Proximity to population areas (300 feet from roadway ?) |
Defined by State |
Defines human or instrument serving as human surrogate |
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Other Considerations |
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Urban Background Concentration |
Defined in EPA Guidance, FHWA Memo |
Indirectly considered; Qualitative analysis suggests comparisons with monitors which may or may not represent background |
Not Defined |
Not Defined |
Urban background concentration only relevant for comparison with measured concentration |
Definition of Project Boundary |
Not Defined |
Not Defined |
Not Defined |
Not Defined |
Defined by % AADT change, other? |
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Analysis Methods |
Qualitative, Quantitative (concentration oriented) |
Qualitative |
Qualitative, Quantitative (inventory oriented) |
Dependent on State, typically mass or energy consumption oriented |
Methods defined in Guidance documents; MOBILE/MOVES for EF; CAL3QHC for concentrations |
TRAINING
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