From: Brent Lorscheider [maiIto: lorsch2728(@_pacbell.net] <br />Seat: Monday, September 25, 2017 12:41 AM <br />To: GIOELLO Nick R <Nick.R.Gioello@ci.eugene.or.us> <br />Cc: Faris Cassell <fcasselI6E~comcast. net> <br />Subject: Road Load on Capital and Spring <br />Nick, <br />I have some follow up questions: <br />1. 1 found two documents that appear to cover this topic, the Administrative Order No. 58-11-11 and the Public <br />Improvement Standards Manual dated Oct 2007. Could yuou pls find out if these are the two documents that <br />cover this topic, of is it another document(s)? <br />2. 1 interpret the reading of the info below to mean that only 6 Class 5 trucks (GVWR of 8 to 20 tons) were <br />observed (registered) during 2105...That seems like an extremely low number??? <br />3. The statement "so the existing ACP thickness meet the 30 year design." factor in the ESAL's from the <br />heavy truck loads that will be generated during construction of the PUD, loads from Class 6, 7 and 8 trucks? <br />Thx, brent <br />Capital and Spring were rehabilitation projects as opposed to a reconstructed street, the difference being that <br />we strive for a 20 year design if we can get it, but we wouldn't reconstruct it if we can achieve a suitable <br />outcome otherwise. A street slated for reconstruct is designed for 30 years. <br />That being said, the existing structure of Capital was 7" to 8" of ACP on clay with the top 2 inches <br />delaminated. The Class counts conducted in 2015 only registered 5.6 Class 5, equating to a 20 year design <br />ESAL of 13,917, and a 30 year of 22,237. Based on an R value of 5, the existing structural number was <br />2.94. The required SIN is 2.0 for 20 year, and 2.2 for 30 year, so the existing ACP thickness meets a 30 year <br />design. - <br />The treatment for the street was a 2" to 4" cold plane pavement removal followed by 2" to 4" of ACP. <br />With 7" to 8" of ACP, the traffic count could more than double and the street would meet the design <br />requirements. <br />Due to the lack of as-builts a number of pavement cores were taken on Spring. The street structure was not <br />very consistent - some of the cores indicated Y-4" of ACP on degraded PCC, and other were Y-6" of ACP on <br />aggregate. The 20 year ESAL is 247,488. Similar to Capital, the treatment was to remove the ACP to PCC <br />and re-pave with 4" of ACP. During construction, the street did not indicate any "soft" areas, so the re-paving <br />is expected to perform well under the design loadings, and is probably sufficient to handle an increase volume <br />of traffic, <br />5 <br />