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N <br />1 <br />1 <br />1 <br />1 <br />1 <br />SP88 -050 - 4 - June 2, 1988 <br />M. W. Carley & Associates, Inc. <br />B.2. Overview of Soils Encountered: All of the borings were <br />performed in the roadway. These borings generally encountered 2 <br />inches of bituminous pavement overlying up to 16 inches of <br />aggregate base materials at the surface. <br />Beneath the pavement section, the borings encountered granular <br />soils (mostly silty to clayey sands) to depths ranging from +3 to <br />+7 feet. The upper granular soils typically consisted of silty <br />sands. However, boring B -1 encountered poorly graded sand with <br />silt to a depth of 4 feet. <br />Below the granular soils, the borings encountered cohesive soils <br />(clays) to the termination depth of the borings. <br />B.3. Groundwater Data: The clays encountered in all the bore <br />holes appeared to wet. Immediately after withdrawal of the <br />auger, groundwater was noted in four borings (B -3, B -4, B -6, and <br />B -7) at a depth of approximately 7 feet. The remaining bore <br />holes caved in at depths ranging from 3 to 61/2 feet. <br />C. ANALYSIS AND RECOMMENDATIONS <br />C.1. Design Data: It is our understanding that the existing <br />pavement section is to be removed and replaced. At this time, <br />specific design information is not available to us. For purposes <br />of this report, we have assumed that the pavement section is to <br />be designed for a 7 -ton residential traffic load. <br />C.2. Roadway Design: Based on the data obtained from the <br />borings, it appears that silty sands will predominate in the <br />subgrade. An Hveem stabilometer test performed on a sample of <br />silty sand from boring B -3 had an R -value of 60. <br />Page 75 <br />Bmuni <br />