Appendix D Traffic Impact Analysis - westplainseis.com

7. CUMMULATIVE ANALYSIS ..................................................................................... 76
7.1.1 2032 Pipeline Conditions ................................................................................................... 76
7.1.2 2032 With Project (Alternatives 1, 2 & 3) ......................................................................... 76
7.1.3 2032 With Project (Alternatives 1, 2 & 3) Mitigations and Descriptions .......................... 84
8. CONCLUSIONS............................................................................................................. 87
9. RECOMMENDATIONS ............................................................................................... 89
FIGURES
Figure 1. Vicinity Map .............................................................................................................................. 22
Figure 2. Site Plan Alt 1 ............................................................................................................................ 23
Figure 3. Existing Lane Geometries and Traffic Control ......................................................................... 32
Figure 4. Existing PM Peak Hour Traffic Volumes .................................................................................. 34
Figure 5. Pipeline Projects ........................................................................................................................ 37
Figure 6. Year 2012 Pipeline Volumes ..................................................................................................... 39
Figure 7. Year 2015 Pipeline Volumes ..................................................................................................... 41
Figure 8. Year 2019 Pipeline Volumes ..................................................................................................... 43
Figure 9. Proposed Project – General Trip Distribution ............................................................................ 51
Figure 10. Proposed Project – 2012 Project Trip Assignment Alt. 1 ........................................................ 52
Figure 11. Proposed Project – 2015 Project Trip Assignment Alt. 1, PH2 ............................................... 53
Figure 12. Proposed Project – 2019 Project Trip Assignment Alt. 1, PH3 ............................................... 54
Figure 13. Proposed Project – 2012 Project Trip Assignment Alt. 2, Buildout ........................................ 55
Figure 14. Proposed Project – 2012 Project Trip Assignment Alt. 3, Buildout ........................................ 56
Figure 15. Alt 1 – Phase 1 Traffic Volumes ............................................................................................. 58
Figure 16. Alt 1 – Phase 2 Traffic Volumes ............................................................................................. 60
Figure 17. Alt 1 – Phase 3 Traffic Volumes ............................................................................................. 62
Figure 18. Alt 2 – Buildout Traffic Volumes ............................................................................................ 68
Figure 19. Alt 3 - Buildout Traffic Volumes ............................................................................................ 72
Figure 20. 2032 Base Traffic Volumes ..................................................................................................... 77
Figure 21. 2032 Alt. 1 Traffic Volumes.................................................................................................... 78
Figure 22. 2032 Alt. 2 Traffic Volumes.................................................................................................... 79
Figure 23. 2032 Alt. 3 Traffic Volumes.................................................................................................... 80
Figure 24. Alt 1 - Buildout Suggested Lane Geometry ............................................................................ 94
TABLES
Table ES- 1. Intersection Substandard Level of Service.............................................................................. 3
Table ES- 2. Operational Analysis Summary-Existing Conditions and Pipeline Project Scenarios ......... 10
Table ES- 3. Operational Analysis Summary-Alternative 1 ...................................................................... 11
Table ES- 4. Operational Analysis Summary-Alternatives 2 & 3 ............................................................. 12
Table ES- 5. MITIGATION - ALTERNATIVE 1 ................................................................................... 13
Table ES- 6. MITIGATION-ALT 2 .......................................................................................................... 15
Table ES- 7. MITIGATION-ALT 3 .......................................................................................................... 17
Table 1. Level of Service Criteria for Signalized Intersections ................................................................ 27
Table 2. Level of Service Criteria for Unsignalized Intersections ............................................................ 27
Table 3. Level of Service for Existing PM Peak Hour Conditions ........................................................... 33
Table 4. Level of Service for Year 2012 Pipeline PM Peak Hour Conditions .......................................... 38
Table 5. Level of Service for Year 2015 Pipeline PM Peak Hour Conditions ......................................... 40
Table 6. Level of Service for Year 2019 Pipeline PM Peak Hour Conditions ......................................... 42
West Plains Development – Spokane Tribe
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Traffic Impact Analysis April 28, 2011