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TJi'9N Mr. Joshua Pock, P.E. 71at~sporhtlan May 2Q 2008 Comukum Page 4 External Site Access and Internal Vehicle Circulation Tf KM reviewed the project site plan for adequacy of external access to the site and internal vehicle circulation. One external project site access is proposed via Ironwood Drive, which connects to the site via a roundabout at Reimers Drive. This access will be controlled by a gate for both residents and visitors. The access is expected to adequately serve project traffic. The site plan shows 36-foot curb-to-curb street widths along internal project streets, except for the Street "A" and Street "B" segments immediately adjacent to the proposed recreation area. The Street "A" segment includes an additional 8-foot width for a recessed parallel parking bay of eight spaces, while Street "B" includes a recessed perpendicular parking bay of 12 spaces. The 36-foot roadway width elsewhere consisu of two ten-foot travel lanes and two eight-foot parallel parking lanes. The roadway design width and parking layout are expected to adequately serve project residents and guests. As shown in the site plan (Figure I ), Reimers Drive would meet Street "A" at an acute angle. It is recommended that the warning sign "W I- I" (curve ahead) be posted on both sides of this curve. The warning sign will advise drivers to lower their speed to safely negotiate this curve. For internal vehicle circulation, it is recommended that a "STOP" sign be installed on the minor approaches of the Street "A" / Courc "D", Street "A" /Street "B", Street "C" /Street "B", Street "A" I Street "I", Street "A" /Street "C" /Court "H", and Street "B" /Street "C" intersections, based on the likely access patterns to the residences. Installing "STOP" signs will help to assign the right-of-way at these intersections and provide controlled access to the main roadway. Comparison of Ironwood Project Impacts to Previous High School Proposal Under a previous development proposal, a 1,000-student high school was proposed at the Ironwood project site. In 2002, a Dowling tragic study estimated that this proposed high school would generate approximately 1,160 a.m. peak hour trips and 100 p.m. peak hour trips. By contrast, it is expected that the Ironwood Active Adult Community Project will generate approximately 30 a.m. peak hour trips and 53 p.m. peak hour trips. The Ironwood a.m. trip total is approximately 97 percent less than the comparable high school a.m. trip total, while the Ironwood p.m. trip total is approximately 47 percent less than the comparable high school p.m. trip total. Therefore, the Ironwood project is expected to generate significantly fewer vehicle trips at this project site than was anticipated under the high school proposal. If you have any questions about our traffic study, please contact us at (925) 463-061 I . Thank you for giving us the opporcunity to study this significant project in the City of Pleazanton. Sincerely, >~r~,~ Andrew R. Kluter, P.E. Senior Transportation Engineer Attachments: Attachment A (Level of Service Methodology); Attachment B (Intersection Level of Service Calculation Sheets) J:\JURISDICTIOM%Pleasanton\013-516 Ironwood\Letter Report\LR052708.doa