Figure 22. — Additional evidence 

 of incipient failure, site 

 91? '-3 (test pit excavation 

 shown in top of photo). 



Of course, this is the most extreme seepage condition imaginable for this site, but the 

 computed required cohesion is compatible with the laboratory strength test results. 



Thus, although the assumption that these soils are cohesionless is conservative 

 and appears desirable for design purposes, it may be necessary to recognize some mini- 

 mum cohesion in the remainder of the site analyses. It may also be necessary to per- 

 form the analyses assuming various values for <f> . 



Site 917-3. This site, shown in figures 21-23, is located on Road 917 approximately 

 4.2 miles from the junction of Road 917 and the main Secesh Road (fig. 4). Considerable 

 importance is placed upon the analysis of this site, primarily because failure is im- 

 pending, as evidenced by cracking in the road surface and settlement of the outside 

 portion of part of the fill (figs- 21 and 22). In addition, a narrow portion of the 

 fill has failed, as shown in figure 23. Thus, this site offered the best opportunity 

 for material sampling and definition of the mode and shape of failure. 



