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GIOELLO Nick From: GIOELLO Nick R Sent: Monday, September 25, 2017 11:45 AM To: 'Brent Lorscheider' Subject: FW: Road Load on Capital and Spring Brent, See below from Scott Gillespie. Thanks, Nick From: GILLESPIE Scott N Sent: Monday, September 25, 2017 11:35 AM To: GIOELLO Nick R <Nick.R.Gioello@ci.eugene.or.us> Cc: FAVREAU Eric J <Eric.J.Favreau@ci.eugene.or.us> Subject: FW: Road Load on Capital and Spring Hi Nick, 1) Pavement design for public streets is addressed in the most current City of Eugene 2016 Public Improvement Design Standards Manual. Here is a link to the 2016 Public Improvement Design Standards Manual. The City utilizes the 1993 AASHTO Guide for Design of Pavement Structures including the 1998 supplement, as amended by the 2016 City of Eugene PIDS. The current AO 58-16- 01 adopts the PIDS Manual and repealed AO 58-11-11. 2) Class counts are typically an average 24 volume. 5.6 Class 5 vehicles would not be unexpected for a residential area like Capital Drive. 3) Pavement design does not directly factor in construction traffic from surrounding areas as a design input. It's factored indirectly through empirical data. Construction traffic is temporary and nearly impossible to directly predict. ESAL growth factors are empirical and anticipate construction activity, seasonal fluctuations and anticipated heavy vehicles. The growth factors include averages of all activity that can be expected on Oregon's roadways. This includes construction traffic. Practically speaking, the 5.6 heavy vehicles on daily basis over 30 years has a larger impact on ESAL's than construction traffic from a specific project. The existing pavement section far exceeds the require design based upon the calculated Structural Number (SN) and can accommodate more vehicles (including heavy vehicles) than what is minimally required for the existing neighborhood and proposed development. 1