2 - EIR18-01; DA18-01; GPA18-06; AA18-10_2525 N MAIN STREET

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Memorandum: The Addington Supplemental Traffic Impact Analysis D:\PROJECTS\RE - 2525 MAIN STREET\ANALYSIS OFFSET SEPTEMBER 2019 REVISED\MEMO SUPPLEMENTAL ANALYSIS.DOCX October 6, 2019 the transportation solutions company...FREEWAY SEGMENT LOS ANALYSIS Freeway segment level of service analyses were conducted for existing and year 2040 with Option E conditions. The existing and year 2040 with project Option E levels of service are shown in Tables I, and J. As shown in Tables I and J, the freeway segments are projected to operate at the same or better levels of service as Option B (Santiago Park-Walkie Way Project Access) from the July 2018 TIA. Therefore, the freeway levels of service under Option E are forecast to be the same or better than the findings disclosed in the July 2018 under Option B (Santiago Park-Walkie Way Project Access). QUEUEING ANALYSIS A queueing analysis was included for the northbound through lanes of Main Street south of Memory Lane to Santa Clara Avenue and for the turn lanes at Main Street and Walkie Way-Driveway and Main Street and Edgewood Road. With the change to intersection geometrics, the storage length for the northbound left turn and the northbound through lanes at the intersection of Main Street/Walkie Way-Driveway, and the southbound through lane at Main Street/Edgewood Road will be reduced by approximately 90 feet. Table K lists the queueing analysis for existing, opening year cumulative, and year 2040 without project conditions. As shown in Table K, all queues fit within the available storage length with the exception of the southbound left-turn lane at Main Street/Edgewood Road under year 2040 conditions. Table L lists the queueing analysis for Option E Main Street and Walkie Way-Driveway project access conditions. As shown in Table L, all queues fit within the available storage length with the exception of the southbound left-turn lane at Main Street/Edgewood Road under year 2040, under the with and without project conditions. It should be noted, that the southbound left-turn queue at Main Street/Edgewood Road also exceeded the available storage length under year existing, opening year, and year 2040 with project Option A: Main Street Access scenario in the TIA submitted in July 2018. Occasionally, additional queueing may occur as a result of the added vehicle travel delay that is expected on Main Street at Walkie Way due to the additional phase necessary to accommodate the intersection offset. However, although Option E does not result in substantial changes to queueing operations surrounding the project site, the project applicant will work with the City to modify the existing raised curb median on Main Street between Walkie Way and Edgewood Road. CONCLUSION The project has been modified to include 278 units instead of 496 units and the project access has been changed to include the east leg of the intersection of Main Street/Walkie Way-Santiago Park-Driveway to create an offset intersection. Under Option E Main Street/Walkie Way-Driveway project access, the study area intersections, roadway segments, and freeway segments are projected to operate at the same or better levels of service as the findings disclosed in the July 2018 TIA. The revised project does not create a significant impact at any intersection based on the thresholds adopted by the City of Santa Ana and other agencies. The revised project also does not result in substantial changes to queueing operations at any intersection. We hope you will find this information helpful. Should you have any questions, please don’t hesitate to call me at (949) 656- 3131. Sincerely, translutions, Inc. Sandipan Bhattacharjee, P.E., T.E., AICP, ENV SP Principal 2-225