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Section 4.0 — Environmental Setting and Discussion oj'Inipacts <br />4.1$.2.16 Cumulative Transportation Impacts (Cumulative Conditions Intersection LOS) <br />Under the proposed project, Sandpiper Elementary School is projected to operate at capacity (i.e., <br />786 students) in five years (2021-2022 school year). Therefore, future cumulative traffic conditions <br />were estimated for the 2021-2022 school year with and without the proposed project. Cumulative no <br />project conditions were estimated by adding a 1.8 percent annual growth factor compounded for five <br />years to existing traffic volumes.43 The growth factor was not applied to the intersections at the <br />project driveways and Egret Lane, because most of the traffic at these intersections is school -related <br />and reflected in the project trip generation. The net project trip estimates were then added to the <br />cumulative no project traffic volumes to yield cumulative plus project traffic volumes. The LOS <br />results for cumulative conditions with and without the project are summarized in Table 4.16-6 below. <br />Table 4.16-6: Cumulative Plus Project Intersection LOS <br />'Seconds <br />Bold and grey indicates a potentially significant impact <br />As shown in Table 4.16-6, all study intersections would operate at LOS C or better under cumulative <br />plus project conditions. The project would contribute to traffic congestion during the 10- to 15 - <br />minute peak periods before and after school. Outside of the peak 10- to 15 -minute periods before <br />and after school, intersection volumes in the project area would be low. For these reasons, the <br />proposed project would not result in a significant cumulative intersection impact. (Less Than <br />Significant Impact) <br />" Year 2021 traffic volumes were forecasted based on the Valley Transportation Authority (VTA)/City/County <br />Association of Governments (C/CAG) 2035 travel demand forecast model. <br />City of Redwood City 108 Initial Study/Mitigated Negative Declaration <br />Sandpiper Elementary School Facilities Expansion November 2016 <br />Cumulative <br />Cumulative Plus <br />Intersection <br />Peak <br />Conditions <br />Project Conditions <br />Intersection Name <br />Number <br />Hour <br />Average <br />Average <br />Delays <br />LOS <br />Delays <br />LOS <br />Marlin Drive and Redwood <br />AM <br />15.4 <br />C <br />18.0 <br />C <br />I <br />Shores Parkway <br />PM <br />10.1 <br />B <br />10.6 <br />B <br />Shell Parkway and Redwood <br />AM <br />13.9 <br />B <br />16.5 <br />C <br />2 <br />Shores Parkway <br />PM <br />10.4 <br />B <br />11.2 <br />B <br />Egret Lane and Redwood <br />AM <br />11.0 <br />B <br />12.4 <br />B <br />3 <br />Shores Parkway <br />PM <br />9.0 <br />A <br />9.5 <br />A <br />Sandpiper Driveway (V) and <br />AM <br />11.6 <br />B <br />12.9 <br />B <br />4 <br />Redwood Shores Parkway <br />PM <br />9.8 <br />A <br />10.3 <br />B <br />Sandpiper Driveway (E) and <br />AM <br />8.8 <br />A <br />8.8 <br />A <br />5 <br />Redwood Shores Parkway <br />PM <br />7.7 <br />A <br />7.8 <br />A <br />Shearwater Parkway and <br />AM <br />9.1 <br />A <br />9.5 <br />A <br />6 <br />Redwood Shores Parkway <br />PM <br />8.8 <br />A <br />9.0 <br />A <br />'Seconds <br />Bold and grey indicates a potentially significant impact <br />As shown in Table 4.16-6, all study intersections would operate at LOS C or better under cumulative <br />plus project conditions. The project would contribute to traffic congestion during the 10- to 15 - <br />minute peak periods before and after school. Outside of the peak 10- to 15 -minute periods before <br />and after school, intersection volumes in the project area would be low. For these reasons, the <br />proposed project would not result in a significant cumulative intersection impact. (Less Than <br />Significant Impact) <br />" Year 2021 traffic volumes were forecasted based on the Valley Transportation Authority (VTA)/City/County <br />Association of Governments (C/CAG) 2035 travel demand forecast model. <br />City of Redwood City 108 Initial Study/Mitigated Negative Declaration <br />Sandpiper Elementary School Facilities Expansion November 2016 <br />