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MOORE & TABER NORTHERN CALIFORNIA <br /> CONSULTING ENGINEERS AND GEOLOGISTS <br /> -4- <br /> The upper unit--extending to depth 31-,-6z ft below natural ground <br /> surface (adjacent roadways)--is stiff dark gray brown sandy <br /> clay and clayey silt with a highly organic clayey surface. <br /> Lower-unit soils extended to maximum depth explored (+22 ft) <br /> and consisted variably of light yellow brown semicompact-very <br /> dense sandy silt/clayey sand and very stiff-hard sandy and <br /> silty clay/clayey silt. <br /> Upper-unit soils encountered at the three boring locations <br /> are indicated to have "high expansion potential" per UBC 29-C <br /> and, below surficially disrupted and highly organic soils, are <br /> considered capable of generating support for structure loads <br /> of moderate magnitude/intensity. Areas of shallow fill due <br /> to previous land-levelling were not identified in the borings <br /> but would be anticipated at some locations on the project. <br /> Lower-unit materials are considered capable of contributing <br /> to sustaining at least light-moderate intensity structure loads <br /> of anticipated magnitude. No free groundwater was encountered; <br /> no natural groundwater is anticipated within +20 ft , but "perched <br /> water" at least seasonally would not be unexpected. <br /> Discussion <br /> The following comments are generalized (per above) <br /> and assume final conditions at specific sites will be confirmed <br /> as generally similar to these borings/conditions. <br />