1. Figure 8.18, soil classification data. This figure summarizes the grain size distribution and
Atterberg limits for soil obtained at a depth of 10 to 13 ft (3 to 4 m). The test pit was excavated using
a backhoe in order to obtain undisturbed block samples of the soil. As indicated in Fig. 8.18, the soil
is classified as a sandy clay of high plasticity (CH). During the subsurface exploration, it was
observed that the sandy clay was located above the groundwater table. Based on laboratory testing
of an undisturbed specimen from the block sample, the sandy clay has a total unit weight 117.6
pcf (18.5 kNm3), dry unit weight 94.1 pcf (14.8 kNm3), water content 25.0 percent, and degree of saturation 85 percent