Agenda - Council - 02/22/1982 - Laserfiche WebLink

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Consulting Engineers Diversified, Inc. February 11, 1982 Page 3 Laborator~ Testing Program The laboratory testing program consisted of visually and manually classifying the soils in accordance with the Unified Soil Classification System. The appropriate group symbol according to this system is noted in parentheses following the soil descriptions on the boring logs. The engineer then stratified, the 'soils by type.as shown on the boring-logs. The stratification lines included represent ,approximate boundaries betWeen soil types. I~-situ, the transition between soil types may be gradual in both the horizontal and vertical directions. A brief explanation of the Unified System is included with this letter report. Subsurface Conditions The subsurface exploration identified approximately 3 inches of asPhaltic concrete at the surface at most boring locations. The asphalt was underlain by a silty san~ in all borings dow~ to a depth of between 2 feet and the termination of some borings at a depth of 9.5 feet. There was no base coarse material (gravel) beneath the bituminous surface coarse. Generally, the area between Stations -7+00 and 2+00 encountered the silty sand to a depth of 2 feet and then a clayey silt layer was encountered. Between approximate Stations 2+00 and 24+00, the sand soil extended to the termination of the.borings. Between approximate Stations 24+00 and 56+00, a plastic clay and clayey silt was encountered below an approximate surficial layer of 3 to 4 feet of silty sand. The plastic clay and/pr clayey silt extended to the termination of all borings between Stations ' ' - - SOILTESTING SERVICES OF MINNESOTA, INC.