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July 3, 2017 <br /> Single-Family Residence <br /> L&A Job No. 17-079 <br /> Page 5 <br /> visual reference to existing topographic features in the field and on the topographic <br /> survey map, and their locations should be considered as only accurate to the measuring <br /> method wed. <br /> A geotechnical engineer from our office was present during subsurface exploration to <br /> monitor test pit excavation, examine soil and geologic conditions encountered, and keep <br /> logs of the test pits. Soil samples obtained from each soil layer in the test pits were <br /> visually classified in general accordance with United Soil Classification System, a copy <br /> of which is presented on Plate 3. Detailed descriptions of soils ncountered during site <br /> exploration are presented in test pit logs on Plates 4 and 5. <br /> The test pits encountered a layer of loose organic topsoil from about 12 to 16 inches <br /> thick, mantling the site. The topsoil is underlain by a layer of weathered soil, consisting <br /> of brown to light-brown, loose to medium-dense, slightly-silty, fine sand, about 1.9 to 3.5 <br /> feet thick. Underlying this layer of weathered soil to the depths explored is an advance <br /> outvvash deposit of gray, dense, fine to coarse sand with trace gravel. <br /> GROUNDWATER CONDITION <br /> Groundwater was not encountered in any of the three test pits excavated on the site. The <br /> topsoil, weathered soil, and the advanced soil are all of moderately-high permeability and <br /> would allow stormwater to seep through easily. Stow water infiltrating into the ground <br /> would perch on top of the practically impervious transitional beds fine-sandy to clayey silt <br /> mapped in the above referenced geologic map. This perched groundwater would flow <br /> LIU & ASSOCIATES, INC. <br />