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• Matt Rodrigues <br /> February 27, 2006 <br /> Page 2 <br /> <br /> r Western Regional FWD calibration center (current reference calibration conducted 10/04/05). The <br /> testing will be accomplished in accordance with ASTM D4695 Leve12 and will be conducted at 100-ft <br /> intervals in the outer wheel paths of the through travel lanes and turn lanes on Pearl Street. <br /> The FWD testing will be conducted during the normal workweek between the hours of 9 AM and 4 <br /> PM. We estimate that the FWD testing will take approximately 5 days to complete and we will <br /> provide traffic control consisting of signing and flaggers to direct traffic around our operation. <br /> The FWD deflection data will be analyzed using our PAYBACK software to calculate the effective <br /> structural number of the existing pavement structure (SNefr) and the resilient modulus (Mr) of the <br /> subgrade soil at each FWD test location. The SNeff values will be analyzed to delineate groups of test <br /> points (analysis units) having statistically similar values and to select locations for pavement core <br /> explorations at FWD test point(s) with backcalculated SNeff value(s) that are representative of the <br /> SNeff values within the analysis units. <br /> Pavement Core Explorations <br /> Core explorations of the pavement will be accomplished at up to 55 locations at an average frequency <br /> of one location per approximately 1,200 lane-ft (through lanes only). The explorations will be <br /> performed at representative FWD test locations selected from review of the backcalculated SNeff <br /> values. These explorations will be conducted to assess the condition of the existing asphalt concrete; to <br /> inspect for evidence of asphalt stripping damage,. top-down cracking and delamination between lifts; to <br /> determine the thickness of the existing pavement layers; and to visually classify the subgrade soil. <br /> The explorations will be conducted during the normal workweek between the hours of 9 AM and 4 <br /> PM. We estimate that the coring will take 7 days to complete and we will provide traffic control <br /> consisting of signing and flaggers to direct traffic around our work areas. We will patch the core holes <br /> using "Instant Road Repair", a polymerized cold patch material, compacted by vibratory hammer. <br /> Subgrade Soil Investigation & Testing <br /> Jar samples of subgrade soil will be obtained at the pavement core locations for laboratory testing to <br /> determine in situ water content and for examination to refine the field soil classification. Additionally, <br /> penetration tests will, be conducted at core explorations in the segments where reconstruction may be <br /> necessary (based on our initial reconnaissance) to check for the possible presence of weak layers.within <br /> the upper 2 ft of the subgrade. The penetration tests will be conducted in accordance with ASTM <br /> D6951 by portable dynamic cone penetrometer (PDCP), which is a manually operated device- for <br /> measuring penetration resistance of soil. <br /> Pavement Visual Survey <br /> We will visually survey the pavement to identify conditions such as medium to high severity alligator <br /> cracking distress and/or rutting distress that would require overlay preparatory work. The results of <br /> the visual survey will be graphically mapped and the areas where preparatory work is required will be <br /> tabulated in the design report. <br /> Pavement Analysis & Report <br /> Truck and bus traffic data provided by the Ciry will be analyzed to develop estimates of the cumulative <br /> Equivalent 18,000-pound Single Axle Load (ESAL) repetitions during the design period. <br /> Backcalculation analysis of the FWD test data will be accomplished in general accordance with the <br /> guidelines of ASTM D5858 using our PAYBACK software. Pavement design analysis will be <br /> accomplished in accordance with the procedures of the 1993 AASHTO Guide for Design of Pavement <br /> Structures (AASHTO Guide) and the 2004 ODOT Pavement Design Guide (ODOT Guide). Overlay <br /> thickness and/or inlay depth will be analyzed for each FWD test point using our PAVCALC software. <br /> The results of the point by point overlay/inlay analysis will be used to delineate boundaries of segments <br /> (work units) having significantly different structural conditions. <br /> Design recommendations will be developed for overlay, inlay, deep milling and reconstruction as <br /> appropriate for the project conditions. Alternative flexible and rigid pavement designs will be <br /> <br />