Transportation and Traffic
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City of Walnut Creek Shadelands Gateway Specific Plan and The Orchards at Walnut Creek Project Draft EIR Appendix J: Transportation and Traffic FirstCarbon Solutions H:\Client (PN‐JN)\3611\36110005\EIR\4 ‐ EIR2\36110005 Sec99‐99 Appendix Dividers.doc Whitlock & Weinberger Transportation, Inc. 490 Mendocino Avenue Suite 201 Santa Rosa, CA 95401 voice (707) 542-9500 fax (707) 542-9590 475 14th Street Suite 290 Oakland, CA 94612 voice (510) 444-2600 website www.w-trans.com Traffic Impact Study for Shadelands Gateway Specific Plan in the City of Walnut Creek Updated Draft Report December 13, 2013 Table of Contents Page 1. Executive Summary .................................................................................................................................................. 1 2. Introduction ............................................................................................................................................................... 3 3. Transportation Setting ............................................................................................................................................ 5 4. Analysis Methodology ............................................................................................................................................ 11 5. Existing Conditions ................................................................................................................................................ 15 6. Specific Plan Scenario ............................................................................................................................................. 20 7. Existing plus Specific Plan Scenario..................................................................................................................... 24 8. Baseline Conditions ................................................................................................................................................ 26 9. Baseline plus Specific Plan Scenario .................................................................................................................... 30 10. Cumulative Scenario .............................................................................................................................................. 31 11. Cumulative plus Specific Plan Scenario .............................................................................................................. 35 12. Neighborhood Impacts.......................................................................................................................................... 37 13. Access and Circulation .......................................................................................................................................... 38 14. Alternative Modes .................................................................................................................................................. 42 15. Land Use Alternatives ........................................................................................................................................... 45 16. Freeway Operations .............................................................................................................................................. 46 17. Findings and Recommendations .......................................................................................................................... 50 18. Study Participants and References ...................................................................................................................... 53 Figures 1. Study Area ............................................................................................................................................................ 4 2A. Existing Traffic Volumes .................................................................................................................................. 17 2B. Existing Traffic Volumes .................................................................................................................................. 18 3. Site Plan ............................................................................................................................................................... 21 4A. Specific Plan Traffic Volumes ......................................................................................................................... 22 4B. Specific Plan Traffic Volumes ......................................................................................................................... 23 5A. Baseline Traffic Volumes ................................................................................................................................. 27 5B. Baseline Traffic Volumes ................................................................................................................................. 28 6A. Cumulative Traffic Volumes ........................................................................................................................... 32 6B. Cumulative Traffic Volumes ........................................................................................................................... 33 Traffic Impact Study for Shadelands Gateway Specific Plan in the City of Walnut Creek December 13, 2013 Page i Tables 1. Collision Rates for Analyzed Intersections ................................................................................................... 9 2. Collision Rates for Analyzed Segments ....................................................................................................... 10 3. Signalized Intersection Level of Service Criteria ....................................................................................... 11 4. City of Walnut Creek Level of Service Standards .................................................................................... 12 5. City of Concord Level of Service Standards .............................................................................................. 13 6. Intersection Level of Service Standards ...................................................................................................... 14 7. Existing Intersection Levels of Service ......................................................................................................... 19 8. Existing Route of Regional Significance Operations ................................................................................. 19 9. Existing and Existing plus Specific Plan Intersection Levels of Service ................................................. 24 10. Existing and Existing plus Specific Plan Routes of Regional Significance Operations ........................ 24 11. Baseline Intersection Levels of Service ........................................................................................................ 26 12. Baseline Routes of Regional Significance Operations ............................................................................... 29 13. Baseline and Baseline plus Specific Plan Intersection Levels of Service ............................................... 30 14. Baseline and Baseline plus Specific Plan Routes of Regional Significance Operations ...................... 30 15. Cumulative Intersection Levels of Service .................................................................................................. 34 16. Cumulative Routes of Regional Significance Operations ......................................................................... 34 17. Cumulative and Cumulative plus Specific Plan Intersection Levels of Service ................................... 35 18. Cumulative and Cumulative plus Specific Plan Routes of Regional Significant Operations............. 36 19. Freeway Level of Service Criteria ................................................................................................................. 46 20. I-680 Northbound Freeway Operations ..................................................................................................... 47 21. I-680 Southbound Freeway Operations ...................................................................................................... 47 22. I-680 Freeway Ramp Intersection Operations .......................................................................................... 48 23. Freeway Ramp Intersection 95th Percentile Queue ................................................................................. 49 Appendices A Collision Rate Calculations B Delay Index and Average Speed Memorandum C Intersection Level of Service Calculations D Delay Index Calculations E Trip Generation Assumptions Memorandum F Baseline Traffic Volume Development Memorandum G Cumulative Traffic Volume Development Memorandum H Queuing Calculations I Freeway Mainline Level of Service Calculations J Ramp Level of Service Calculations K Ramp Queuing Calculations Traffic Impact Study for Shadelands Gateway Specific Plan in the City of Walnut Creek December 13, 2013 Page ii 1. Executive Summary The proposed Shadelands Gateway Specific Plan would allow for the development of a mixed use center on the northwest corner of Ygnacio Valley Road/Oak Grove Road in the City of Walnut Creek, replacing two existing office buildings. The mixed use development would include a grocery store, shopping center and senior housing complex. Additionally, one building would be developed as either a fitness center/gym or a medical office building. All study intersections not located