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• -6_ <br />Hydrocompactive soils are con.-mon in areas with loosely <br />deposited alluvial fan or collu~ial soils. Clays may also <br />exhibit expansion potential, probably caused by shrinkage due to <br />desiccation. Methods to construct foundations on ttre soils at <br />the site are discussed in "Foundation Recommendations" below, <br />The potential for construction induced slope instability can <br />be reduced by limiting cut and fill depths and providing rela- <br />tively flat graded slopes. At this site we would expect cuts and <br />fills graded to about 1.75 horizontal to 1 vertical and flatter <br />to generally be stable, provided they are properly constructed <br />and drained. Methods to mitigate potential slope instability and <br />erosion at the site are discussed in the "Site Grading" section. <br />The debris flow potential at the site was reported as low. A <br />hydrologist should evaluate the surface flow conditions. Our <br />preliminary goetechnical report recommended structures be de- <br />signed to Unified E3uilding Code :one II criteria. Our previous <br />report should be referred to for a more detailed description of <br />the geologic conditions. <br />FIELD INVESTIGATION <br />The field exploration for the project was conducted on <br />September 27 through October 2, 19x5. Eleven exploratory borings <br />were drilled at the locations shown on Fig. 1 to evaluate the <br />subsurface conditions. The number of holes and their locations <br />were specified by the client. Drilled locations and surface <br />elevations of the exploratory borings were determined by <br />Schmueser ~ Associates. Access to most of the boring sites <br />Chen & Associates <br />