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Mr. Richard Haygood July 14, 1999 Page 3 3. Middlefield Road/Costco South Driveway 4, Middlefield Road/Flynn Avenue D KS shall use existing turning movement counts collected as part of the March 25, 1999 Costco Gasoline Station Addition Traffic Impact Analysis for this environmental assessment and no new counts will be conducted at the study intersections, DKS staff will also conduct a field visit and observe weekday peak period vehicular and pedestrian traffic near the elementary school on Charter Street. Task 2. Trip Generation Analysis DKS will review trip generation data at the Sunnyvale Costco Gas Station, data previously collected for other Costco gas station projects (Santa Clara and South Sacramento), and also material provided by Barghausen Engineers regarding membership levels/trip generation at existing Costco facilities where refueling facilities have been installed. In order to verifY that the trip generation data collected at these other gas stations are valid for the proposed project, DKS shall compare the anticipated fuel gallonage to be delivered to the proposed project with the gallonages experienced at the sample gas stations, DKS will prepare a memo to the City of Redwood City summarizing the suggested trip generation rates for the proposed Redwood City project. The trip generation to be used for the project should be approved by City staffbefore proceeding to Task 3, Task 3. Impact Analysis For this project, DKS will modifY the TRAFFIX model previously created as part of the March 25, 1999 Costco Gasoline Station Addition Traffic Impact Study to analyze impacts at intersections and arterial streets, For each intersection analyzed, DKS staff will estimate the weekday AM, and P,M, peak hour level of service (LOS) using the Circular 212 Planning methodology (as specified in the 1997 Congestion Management Program for San Mateo County), All critical assumptions will be confinned with City staff prior to their incorporation into the traffic impact model. We will review pass-by and diverted vehicle trip calculations with City staff to confirm our assumptions regarding vehicles on Woodside Road and Middlefield Road that would access the proposed gas station, The impact analysis will include the following scenarios: 1. Existing Condition (no new analysis assumed; information to corne directly from March 25, 1999 Costco Gasoline Station Addition Traffic Impact Analysis) 2. Existing + Background Condition 3. Existing + Background + Project Condition 4. Cumulative Condition In addition to intersection impacts, particular attention will be given to the following transportation- related impacts: ........-".--- .._. T'