ESBGU <br />Pavements <br />The following sections provide a summary of our analysis and design and <br />construction recommendations for the bus loop and passenger vehicle parking lot <br />pavements. Specifications refer to the ODOT Oregon Standard Specifications for <br />Construction (ODOT, 2018a). <br /> Pavement design was completed using the AASHTO 1993 design method <br />and design parameters based on the ODOT Pavement Design Guide (2007) and the <br />City of Eugene Public Improvement Design Standards Manual (City of <br />Eugene2016). Both flexible (AC) and rigid (PC) pavement designs were completed. <br />The following design parameters were assumed for PCC design: <br />reliability of 90% <br /> <br />internal serviceability of 4.5 <br /> <br />terminal serviceability of 2.5 <br /> <br />overall standard deviation of 0.4 <br /> <br />a minimum 28-day concrete compressive strength of 4,000 psi (ODOT <br /> <br />Class 4000) and an average 28-day flexural strength of 624 psi <br />concrete modulus of elasticity of 3,600,000 psi <br /> <br />load transfer, J, of 3.2 <br /> <br />subgrade resilient modulus, M, of 4,500 psi <br /> <br />r <br />base aggregate resilient modulus, M, of 20,000 psi <br /> <br />r <br />minimum base aggregate thickness of 12 inches <br /> <br />loss of support of 1.0 <br /> <br />modulus of subgrade reaction, k, of 100 pci <br /> <br />drainage coefficient, C, of 1.0 <br /> <br />d <br />40-year design <br /> <br />Per ODOT Section 02001.33, the average 28-day flexural strength was calculated as <br />9 times the square-root of the average 28-day over-design (f’) compressive <br />cr <br />strength. The f’is calculated as 1.20 x f’. A minimum unconfined compressive <br />crc <br />strength (f’) of 4,000 psi was assumed for ODOT Class 4000 concrete.Jointed Plain <br />c <br />Concrete Pavement (JPCP) was assumed for rigid pavements. <br />Santa Clara Transit Center January 15, 2019 <br />Geotechnical Investigation 5 Project 2181060 <br />Eugene, Oregon Rowell Brokaw <br />