Agenda - Council - 03/23/1982 - Laserfiche WebLink

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C~)n:;tl]_[i[~ Engineers Diversified, Inc. February 11, 1982 Page 4 24+00 and 56+00. A soil profile which has been estimated from the twenty-one boring locations is included with this letter. This profile was based on borings performed every 200 to 400 feet; thus, the conditions shown should only be used as a guideline for estimating purposes. The drill crew noted that the soil was frozen to a depth of 3 to 4 feet below the ground surface at all locations. Water was not encountered in any of the boreholes while drilling or after completion of the boreholes except at boring 12, where water was encountered ar a depth of 6 feet while drilling. . The soil conditions encountered at the individual boring locations are shown on the respective boring logs. Pavement Subsrade Recommendations .Our subsurface exploration has identified an appr6ximate 3 inch bituminous surface layer overlying sand and silty sand soils. A gravel base coarse · was not encountered in any of the borings. With regard to the design of a new pavement section, one of the primary design considerations fgr a moderately loaded pavement is heave/settlement related to freeze/thaw conditions. Though ground water was not encountered in any of the borings except boring 12, possible infiltration of water into the subgrade soils can cause heaving conditions during the winter. In addition, during thawing conditions, the subgrade can become weakened and experience a loss of bearing capacity* ' SOILTESTING SERVICES OF MINNESOTA, INC.