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From THE UULCRN RRNCH CO ~ PHONE No. 303 984 3601 ~ De c. 09 1994 12:50PM P09 <br />-6- <br />Hydrocompactive soils are common in arena with loosely <br />deposited alluvial Fan or colluvial .soils. Clayo may also <br />exhibit expansion potential, probably caused by ahrinkege due to <br />desiccation. Methods to construct foundations on the aoila at <br />the site are discussed in ~~Foundation Recommendations~~ below. <br />The potential for construction induced elope lnatability een <br />be reduced by limiting cut and fill deptha and providing rela- <br />tively flat graded slopes. At this site we would expect cuter 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 snd <br />erosion ~ the site are discussed in the ^Site Crading~~ section. <br />Tho debris flow potential at the site wsE reported as low. A <br />hydrologist should evaluate the surface flow condltion~. Our <br />preliminary goeteohniaal report recommended structures be de- <br />signed to Unified building Code Zone II criteria. Our previous <br />report should De referred to for a more detailed description of <br />the geologic conditions. <br />FIELD INVESTIGATION <br />The field exploration for the project wes conducted on <br />September 27 through OcCoDer' 2, 1985. Eleven exploratory boring., <br />were drilled at the locations shoxn on Fig. 1 to evaluate the <br />subsur•i'ace conditions. The number of holes and their locations <br />were specified by the client. Drilled locations and surface <br />elevatlurrs of tttc exploratory borings were determined by <br />SuFrmueser ~ Asauclnto~. A~~es:, to moat of the boring cites <br /> <br />Chen & Associates <br />