Reso13 PC 13-09 2859 Initial Study Mitigated Negative Declaration Kensington

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TJ KM Transportation Consu Itants Analysis Methodology Study Methodology TJKM evaluated traffic conditions at the signalized intersection of EI Camino Real and Oakwood Drive, during typical weekday a.m., school dismissal p.m., and commute p.m. peak hours. As presented in a subsequent section of this report, the project would generate substantially less than 50 peak hour trips, which would not necessarily require detailed intersection traffic analysis to evaluate potential impacts. However, evaluating the need for a right-turn lane on eastbound Oakwood Road, which would be precluded by the proposed vacation of an existing easement allowing for such lane, requires the detailed, peak-hour intersection analysis that follows. TJKM also evaluated the potential increase in traffic volume on Oakwood Drive as a neighborhood street west of EI Camino Real based on daily as well as peak period traffic volumes. The peak time periods analyzed are as follows: • A.M. (7:00-9:00 a.m.) • School p.m. (2:00-4:00 p.m.) • P.M. (4:00-6:00 p.m.) This study addresses the following two traffic scenarios: I. Existing Conditions—This scenario evaluates operational conditions at the study intersection based on existing traffic counts, which include traffic generated by the existing retail use on the site, as well as field surveys. 2. Existing plus Project Conditions—This scenario is identical to Existing Conditions, but with the addition of net new traffic that the proposed project is expected to generate. Intersection Level of Service Analysis Methodology Traffic impacts on the study intersection were quantified through the determination of level of service (LOS), a qualitative measure describing operational conditions within a traffic stream. There are six levels of service defined for each type of facility (i.e., intersection) that is analyzed. LOS has letter designations ranging from A to F, with LOS A representing the best operating conditions and LOS F the worst. Procedures for analyzing each type of facility are based on the Highway Capacity Manual 2000 (HCM 2000). Generally speaking,for intersections, average delay per vehicle is the quantitative measure that is used to determine LOS. Signalized Intersections For the signalized study intersection, the operating conditions and LOS will be evaluated using the 2000 Highway Capacity Manual (HCM) Operations Method as incorporated in the Synchro traffic software. Peak hour intersection conditions are reported as average delay per vehicle with corresponding levels of service for the intersection as a whole. The methodology is described in detail in Appendix A. Local Residential Street Traffic Volume Analysis Methodology Traffic impacts on Oakwood Drive west of EI Camino Real were quantified by determining the percentage increase to existing traffic volumes that would be expected with the proposed project during the peak periods and for the daily 24-hour traffic volume. Dra ft Report— Tra�c Impad Study for Assisted Living Facility Development at 2808 EI Camino Real Page 5 in the City of Redwood City March 12, 2012