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City of Centerville <br /> Project SP-07-03738 <br /> November 29,2007 <br /> Page 4 <br /> Note: Some of the borings encountered what appeared to be a layer of geotextile fabric material below <br /> the aggregate base. <br /> B.2.b. Existing Fill <br /> Below the pavement materials,33 of the borings encountered existing fill to depths ranging from I to 6 <br /> feet.The existing fill consisted of silty sand(SM),clayey sand(SC),sandy lean clay(CL),poorly graded <br /> sand(SP),poorly graded sand with silt(SP-SM)and organic silt(OL)that was mixed in color mostly <br /> ranging from dark brown to gray,and typically contained trace amounts of gravel The clayey fill was <br /> generally wet and the granular fill was typically moist. Six borings did not penetrate existing fill. <br /> B.2.c. Buried Topsoil <br /> Below the pavement or existing fill,Boring ST-3 encountered about feet of'buried topsoil comprised of <br /> sandy lean clay that contained roots and fibers. The buried topsoil was dark brown and was moist <br /> B.2.d. Native Soils <br /> Below the pavement,buried topsoil and existing fill where penetrated,the borings encountered glacial <br /> and alluvial deposits consisting predominately of sandy lean clay,lean clay with sand(CL)and clayey <br /> sand and,to a lesser extent,silty sand,sandy silt (ML),silty clayey sand(SC-SM).. These soils were <br /> brown to gray and the glacial soils typically contained trace amounts of gravel. The soils were generally <br /> wet(CL,SC,ML, SC-SM)and moist(SM). <br /> B.3. Penetration Resistance Data <br /> Results of the penetration resistance tests performed in the materials encountered by the borings are <br /> summarized below in Table 2. Interpretive comments are provided to illustrate the engineering <br /> implications of the penetration resistances. <br /> Table 2 Penetration Resistance Data Summary <br /> Range of Penetration <br /> Material Classification Resistances Comments <br /> Existing Pill and Buried SM,SC,CL,SP,SP-SM, Variably and mostly <br /> Topsoil OL 3 to 13 BPF poorly compacted. <br /> Generally very soft to <br /> Alluvium and Glacial Soils 2 to 18 BPF,most not rather soft,locally <br /> Cohesive CL,SC,SC-SM exceeding 5 BPF medium to stiff. <br /> Alluvium and Glacial Soils <br /> Non-cohesive ML,SM 3 to 10 BPF Very loose to loose. <br />