Laserfiche WebLink
and pond have illustrated the value of photogeologic and field geologic mapping to <br />• location of drill holes, to project construction, and eventually to maintenance. <br />In 1994 AI was retained to make an engineering geology investigation of the main <br />haul road route planned for the Yoast Mine (A[, 1994). The reported stated (p.6) "The <br />area through which the alignment passes is free of landslides and related types of <br />geologic hazards." The report also stated that construction of the haul road and related <br />facilities presented no unusual problems. Further, the report (p.7) concluded <br />"Geologic mass-wasting such as landslides, soil creep, rockfall, and debris avalanches <br />were not observed in the area and none are expected if reasonable standards of care are <br />maintained during construction and maintenance activities." <br />2.0 SUMMARY AND CONCLUSIONS <br />2.01 Summary <br />The purpose of this investigation is to determine if azeas of Bound instability <br />occur in that part of Yoast Mine where coal extraction is planned for the years 2000- <br />2004. The scope of this investigation included a comparative review of the previous <br />engineering geologic investigation (AI, 1994) and Exhibit 6-1 (SCC, 1995); the latter <br />showed a series of landslide deposits that was not shown in the former study. The present <br />investigation also included review and field examination during which photogaphs (see <br />Figs. 1-23, Appendix A) were taken in support of the comparative review. A total of 21 <br />landslide deposits is included on Drawing 9316-B-1. Only 17 of these were studied <br />because of their presence in or proximity to the mine permit area. The four excluded <br />landslides aze in the northwest comer of the drawing. <br />Evidence could not be Found for the 17 landslides shown on Exhibit 6-1. One <br />possible exception (Landslide D, Fig. l) is questionably an old landslide whose <br />• <br />3 <br />