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boring log are the number of blows required to drive the 2 -inch diameter split -spoon sampler 12 inches, <br />or increments as shown, into undisturbed soil using a 1 40-pound hammer dropped 30 inches. Undisturbed <br />samples for use in the laboratory were taken in 3 -inch O.D. thin wall Shelby samplers, hydraulically pushed <br />into the soil. Undisturbed and disturbed samples were sealed in the field and preserved at natural moisture <br />content until tested in the laboratory. <br />The complete log of the boring operation is shown on the attached plate and include visual classifications <br />of each soil, location of subsurface changes, standard penetration test results, and subsurface water level <br />measurements at the time of this investigation. <br />LABORATORY TESTING <br />Laboratory tests were performed to determine soil classification, moisture contents, dry densities, swelling <br />and consolidation characteristics, plasticity, gradation and soluble sulfates. <br />SUBSURFACE CONDITIONS <br />Subsurface strata consisted of clay /sand fill followed by native fat /lean clays all underlain by silty sands and <br />sandy gravels. A description of each in order of increasing depth follows. <br />Clay /Sand FILL - At the surface in Boring No. 4, a 3' +/- thick layer of fill material comprised of layers of <br />roadbase, fat clays and silty sands was found. When properly compacted, this material provides moderate <br />bearing capacities. <br />2 <br />