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- 10 - <br />• <br />been exposed for a period of more than 4 years, it can be expected <br />that cuts of a similar size will not create any significant slope <br />stability hazard in the future years either. <br />2.5 GEOTECHNICAL UNITS <br />For the purpose of this study the area of concern was mapped <br />and divided into several geotechnical units. These units are shown <br />on Geotechnical Maps, Plates 2 A through 2 D. Geotechnical <br />mapping was performed without using any surveying instruments and <br />its accuracy is limited for this reason. The maps will provide <br />information on materials which will be encountered during the <br />excavation of the cuts, construction of fills or other facilities. <br />It will also provide information on the extent of individual soil <br />types that may used as construction materials. The map does not <br />show any thickness of individual units as it is impossible to pre- <br />dict it without subsurface exploration. Some road cuts that have been <br />excavated in soils may encounter rock if they are deepened or ex- <br />cavated at different locations. The prediction of geologic con- <br />ditions in the detail would require drilling or excavation of test <br />pits. <br />The geotechnical units identified and delineated on the <br />geotechnical map are: man-made fills, alluvial deposits, terrace <br />deposits, colluvial soils, talus deposits, cliff-forming sand- <br />. stones, and slope-forming shales and sandstones. <br />Man_made_fills are formed mostly by the material that was <br />