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Consulting Engineers Diversified, Inc. <br /> <br />February 11, 1982 <br />Page 4 <br /> <br />24+00 and 56+00. A soil profile which has been estimated from the <br />twenty-one boring locations is included with this letter. This profile was <br />based on borings performed every 200 to 400 feet; thus, the conditions <br />shown should only be used as a guideline for estimating purposes. <br /> <br />The drill crew noted that the soil was frozen to a depth of 3 t° 4 feet <br />below the ground surface at all locations. Water was not encountered in <br />any of the boreholes while drilling or after completion of the boreholes <br />except at boring 12, where water was encountered at a depth of 6 feet while <br />drilling. <br /> <br />The soil conditions encountered at the individual boring locations are <br />shown on the respective boring logs. <br /> <br /> Pavement Sub$rade Recommendations <br /> <br />.Our subsurface exploration has identified an approximate 3 inch bituminous <br />surface layer overlying sand and silty sand soils. A gravel base coarse <br />~was not encountered in any of the borings. <br /> <br />With regard to the design of a new pavement section, one of the primary <br />design considerations for a moderately loaded pavement is heave/settlement <br />related to freeze/thaw conditions. Though ground water was not encountered <br />in any of the borings except boring 12, possible infiltration of water into <br />the·subgrade soils can cause heaving conditions during the winter. In <br /> <br />addition, during thawing conditions, the subgrade can become weakened and <br />experience a loss of bearing capa~ity' <br /> <br />, SOILTESTINGSEflVICESOFMINNESOTA, INC., , ,,, , , ,, ., <br /> <br /> <br />