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Matt Rodrigues <br /> March 18, 2005 <br /> Page 2 <br /> Proposed Work Scope <br /> Project Reconnaissance <br /> The project engineer will inspect the streets to become familiar with the pavement conditions, identify <br /> the probable type of rehabilitation work and to refine the field testing program. <br /> Non-destructive Deflection Testing <br /> Non-destructive deflection testing will be conducted using our KUAB Falling Weight Deflectometer <br /> (FWD) to determine the strength of the pavement layers and subgrade soils. The FWD testing will be <br /> conducted at 100-ft intervals in the outer wheel paths of the through travel lanes, except that on <br /> Jefferson Street the testing will be conducted at 50-ft intervals due to the short length of this project. <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 7 days to complete and we will <br /> provide traffic control consisting of signing and flaggers to direct traffic around our operation. <br /> Pavement Core Explorations <br /> Core explorations of the pavement will be accomplished at up to 81 locations at an average frequency <br /> of one location per 1,100 lane-ft (through lanes only). The explorations will be performed at <br /> representative FWD test locations selected from review of the FWD deflection test data. These <br /> explorations will be conducted to assess the condition of the existing asphalt concrete; to inspect for <br /> evidence of asphalt stripping damage, top-down cracking and delamination between lifts; to determine <br /> 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 tbe coring will take 10 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 the subgrade soil will be obtained at the pavement core locations for laboratory testing <br /> to determine in situ water content and for examination to refine the field soil classification. <br /> Additionally, penetration tests will be conducted at the core explorations in the segments where <br /> reconstruction may be necessary (based on our initial reconnaissance). The penetration tests will be <br /> conducted by portable dynamic cone penetrometer (PDCP), which is a manually operated device for <br /> measuring penetration resistance of soil. The PDCP measurements will be used to estimate in situ <br /> CBR and resilient modulus (Mr) of the soil within the upper 1 to 2 ft of the subgrade for calibration of <br /> the Mr values that are backcalculated from the FWD test data. <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 /> The FWD and core test data will be analyzed to backcalculate the in situ Mr of the subgrade soil and, <br /> <br /> for overlay or inlay analysis, the effective structural number of the existing pavement. Truck and bus <br /> <br />