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7.B. - Page 59 Redwood City Chapter 4.Environmental Impact Analysis Impact Discussion Would the project: a. Cause an increase in traffic which is substantial in relation to the existing traffic load and capacity of the street system(i.e.,result in a substantial increase in either the number of vehicle trips,the volume to capacity ration on roads,or congestion at intersections)?For intersection circulation,an impact may be identified as significant according to Redwood City thresholds if a project: • Increases the delay at an intersection that currently operates at a LOS E or LOS F by five (5)seconds or more;if the intersection is unsignalized, then additional traffic volumes must meet the Caltrans peak hour volume warrant for traffic signal installation • Causes an unsignalized intersection currently operating at LOS D or better to degrade to LOE E,and either:1)increases the delay by 5 seconds or more, or 2)traffic volumes exceed the Caltrans peak hour traffic signal warrant criteria. For local residential roadway segments, a significant traffic impact would occur if • The roadway segment currently carries less than 3,000 vehicles per day;and • There is an increase in traffic volume of more than 5 percent of the daily or peak hour traffic. The absolute minimum threshold is an increase of 5 peak hour trip of 50 daily trips for low volume roadways. As discussed below,the proposed modifications would not result in any new or more severe significant traffic impacts beyond those previously addressed in the 2007 FEIR and 2007 Addendum No. 1,and there are no other changes in circumstances,or new information that would necessitate any major modification of the traffic,circulation and access discussions in the 2007 FEIR and 2007 Addendum No. 1. Construction Less-than-Significant New Impact.Construction activities would generate construction-related traffic,which could create a temporary increase in localized traffic.Construction of the proposed modifications is anticipated to take place in April 2013 and last for approximately 7 weeks.The construction is expected to generate truck trips ranging from 4 to 26 trips per day(2 to 13 truckloads per day).Assuming these trucks would enter and exit the project site over an 8-hour work day,construction of the proposed modifications would result in a maximum of four truck trips per hour.The number of construction workers would vary during construction with no more than 15 workers at any given time.Assuming the workers would mostly enter the project site during the AM and PM peak hours,construction of the proposed modifications would result in a maximum of 15 worker trips per hour.Therefore,during the construction period,the proposed modifications are expected to generate a maximum of 19 vehicle trips per hour(4 truck trips plus 15 worker trips) in the AM and PM peak hours. As shown in Table 4.3-2,the intersections near the project site are expected to operate better than the City and C/CAG standards.The construction work would only temporarily generate a maximum of 19 vehicles per hour in the project vicinity and is not anticipated to degrade the intersection LOS at the study intersections.Therefore,the increase in construction traffic would not conflict with the Addendum No.2 to the Environmental Impact Report for 4-14 September 2012 the Redwood City Costco Wholesale Project ICF 00154.12