- Project/Intersection Description
- Determine air quality/regulatory objectives
- Assemble all data pertaining to intersection-related traffic conditions
- Multiple intersection screening/ranking
- Rank Top 20 by traffic volumes
- Calculate LOS for Top 20
- Rank by LOS
- LOS=A, B, C
- LOS=D, E, F
- No further analysis required unless in Top 3 based on traffic volumes
- Model Top 3 based on LOS
- Model Top 3 based on traffic volumes
- Individual intersection modeling
- Assemble data on traffic, meteorology, site characteristics, background
- Locate receptors
- Compute 1-hour peak-traffic concentrations using CAL3QHC
- Apply persistence factor and background
- Compare results with NAAQS
The flows are as follows:
- 1 into 2
- 2 into 3
- 3 into both 4 and 13
- 4 into 5
- 5 into both 6 and 12
- 6 into 7
- 7 into both 8 and 9
- 8 into 10
- 9 into 11
- 10 is a dead-end
- 11 into 12
- 12 into 14
- 13 into 14 as well
- 14 into 15
- 15 into 16
- 16 into 17
- 17 into 18
- 18 flows into Conformity Determination
