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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />II. FIELD INVESTIGATIONS <br /> <br />A. Aerial Photo MappinR <br /> <br />Aerial photographic mapping of the project area prior to the <br /> <br /> <br />landslide was performed by Delta Aerial Surveys on June 27. 1975. A <br /> <br /> <br />copy of this mapping is shown on Figure II-I and does not reflect <br /> <br />current topographic conditions. Following the June, 1986 slide. con- <br /> <br />siderable excavation and slope dressing Was performed by the Owner. <br /> <br />In order to obtain current topographic conditions that would allow a <br /> <br />more accurate stability analysis and to more accurately define quan- <br /> <br />tity estimates of excavated material, an aerial survey of the project <br /> <br />area was again performed by Delta Aerial Surveys. This was done on <br /> <br />October 8. 1986 and a new topographic map was developed for the pro- <br /> <br />ject area. A map showing existing conditions is shown on Figure 11-2. <br /> <br />B. Geotechnical Investigations <br /> <br />Geotechnical investigations for the project area Were accomplished <br /> <br />in two phases. Phase one consisted of a field sampling and testing <br /> <br />program. Phase two consisted of formal laboratory testing. <br /> <br />II-I <br />