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City of Eugene Contract #2009-00237 <br /> Exhibit B -Scope of Work <br /> CONSULTING ENGINEERS FOR PAVEMENTS <br /> PAVEMENT SERVICES, INC. sa, N.E. 20~^ AvENDE, su1TE ,07 <br /> PORTIAN D, OREGON 9 723 2-2 862 <br /> 503.235.0377 • FAX 503.231.2885 <br /> Psl®PSIPDx.COM <br /> December 11, 2008 <br /> Mr. Matt Rodrigues, PE <br /> Eugene Public Works Engineering <br /> 244 E Broadway <br /> Eugene, OR 97401 <br /> Re: 2010 Pavement Preservation Program -Pavement Design Proposal <br /> Dear Matt, <br /> We are pleased to present the following proposal to provide pavement design recommendations for [he <br /> 2010 Pavement Preservation Program (PPP) street segments shown below. <br /> 2010 Pavement Preservation Pro am Se ents -Table 1 <br /> rY Length, <br /> Priorit Street NYom To Lanes Pavement ft <br /> 510 ft east of <br /> 1 W 18'" Ave Chambers 1785 W 18th 4 AC/PCC 1,034 <br /> West side of City <br /> 1 W 18"' Ave 1785 W 18" View 2 AC 2,121 <br /> 850 ft north of Cal 450 ft north of I-105 <br /> 2 Cobur Rd Youn off-ram 4 AC 6,453 <br /> West side of <br /> 3 W 13`" Ave Washin ton West side of Adams 2 AC/PCC 1,765 <br /> Total Len th 11,373 <br /> The segments lengths and delimiters shown in Table 1 correspond to those. shown in the street list that <br /> you sent us except that the length of the Coburg Rd segment has been adjusted to the length as <br /> measured using Goggle Earth'"`. Our understanding of the project conditions and our preliminary <br /> assessment of the type of rehabilitation that wi[1 likely 6e required are discussed below for each project <br /> based on our windshield inspection of the pavement, information from our prior investigations (for <br /> portions of W 18'" and W 13's) and data from the City's Pavement Management System (PMS) records. <br /> W 18'" Ave <br /> The pavement appears to be in poor condition with frequent to extensive areas of distress indicative of <br /> structural failure. The 4-lane section of W 18'" from 510 ft east of Chambers to approximately 525 ft <br /> west of Chambers apparently has thin Asphalt Concrete (AC) overlay on jointed Portland Cement <br /> Concrete (PCC) pavement with at least one location of severe slab cracking in the eastbound lane near <br /> the east end of the project. The AC overlay. is in very poor condition with deterioration appazently due <br /> to asphalt stripping related damage. <br /> In 1989. we investigated the 2-lane section that starts at 525 ft west of Chambers and extends west to <br /> City View. The pavement section at our two core explorations in this section consisted of 3.5 to 4 <br /> inches of AC on approximately 11 inches of a combination of aggregate materials consisting of <br /> Aggregate Base (AB) on Aggregate Subbase (ASB) on bar run aggregate. Our design report for the <br /> <br /> --1989-evaluation included three rehabilitation alternatives consisting of 3.5 inch deep milling with 7 to <br /> 7.5 inch thick overlay (3.5 to 4 inch grade increase) or 4 to 5.5 inch thick overlay on the existing <br /> pavement or reconstruction with 8.5 to 9 inches of AC. However, the City's PMS records indicate that <br /> no major rehabilitation work has been done since 1971. The pavement in this segment has nearly <br /> continuous medium to high severity alligator cracking and rutting along both wheelpaths in -the <br /> westbound direction and similar, but less extensive, distress in the wheelpaths of the eastbound <br /> direction. <br /> It appears likely that the pavement throughout the project will need to be reconstructed due to the <br /> potential of reflective cracking from the PCC in the 4-lane section and insufficient base thickness in the <br /> <br />