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memorandum DATE: October 6, 2019 TO: Zed Kekula, P.E., Senior Civil Engineer FROM: Sandipan Bhattacharjee, P.E., T.E., AICP, ENV-SP SUBJECT: The Addington — Supplemental Traffic Impact Analysis Translutions, Inc. (Translutions) is pleased to provide this memorandum discussing the supplemental traffic impact analysis for the Addington project (previously Magnolia at the Park). The project is located at 2525 Main Street in the City of Santa Ana, California. Translutions prepared a traffic impact analysis (TIA) for the project in July 2018. Since then, the project has been modified to include 278 units instead of 496 units and the project access has been changed. As proposed now, the project will have one main access and will move the east leg of the intersection of Main StreeNWalkie Way -Santiago Park approximately 90 feet to the south to create an offset intersection. Along with offsetting the intersection, the project will be modifying the existing traffic signal, channelization and other components of the intersection as deemed necessary during the redesign process. This Option is being called Option E. Under Option E, the existing southbound left turn pocket on Main Street at Walkie Way will serve both the project and the park and will be extended from 80 feet to 90 feet with the removal of the north leg crosswalk. The east leg of the intersection is intermittently dosed off by an existing gate but provides full access to park maintenance vehicles and to the public who by reservation use park facilities. Under the current project proposal, maintenance vehicles and the public will access the park through the proposed project site access as shown in Figure 1. The signalization of the east and west legs will operate with split -phasing and the northbound and southbound left -turn lanes will operate with lead/lag phasing. The Main Street pedestrian crossing will be relocated to the south leg of the intersection. The south side of the lot will be dedicated to the Discovery Cube. Access for Cube Parking will be through a right-in/right-out driveway south of the Main Street/Walkie Way -Santiago Park -Driveway and used by only Cube patrons and not by the project. A shared parking agreement will be made between the Cube and the Addington, wherein residents and/or guests for the Addington will not be allowed to use the parking lot between the hours of 7:00 a.m. and 6:00 p.m. Based on discussion with the City, the Addington Management will ensure that the parking area dedicated to the Cube will not be used by Addington residents and/or guests. Further, the right-in/right-out driveway will be restricted to Cube patrons only. It should be noted that Cube patrons use the parking lot under existing conditions. The existing trips for the Discovery Cube are low and have been included in the analysis at Main Street and Discovery Cube Driveway based on existing traffic counts. Once the project is completed, the Discovery Cube parking lot will include 180 parking stalls. This access scenario (Option E) is very similar to Option B (Santiago Park-Walkie Way Project Access) evaluated in the July 2018 TIA, with the following two differences: 1. The existing signalized access has been relocated on site and a right-in/right-out driveway for the Discovery Cube has been added; and 2. The number of units has been reduced from 496 to 278. The analysis for Option E includes evaluation of all intersections, roadway segments, and freeway segments that were evaluated in the July 2018 TIA for consistency between analyses. Figure 1 (all figures and tables attached) illustrates the site plan. Project Trip Generation. The number of apartment units has been reduced from 496 apartment units to 278 apartments. The trip generation has been revised to reflect the reduced number of apartment units. Trip generation for the proposed project is