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I • 3.3.3 East Pane] Landslide Geotechnical Evaluation An East Panel landslide occurred on October 8, 200b. A geotechnical evaluation program has been designed by Agapito Associates. This program is designed to determine the slide plane and to determine pazameters for future development of G and K pit. This program also includes sites in Z dip pit. A description of the sites is shown on Tables 3.3-1,3.3-2. Nine holes are scheduled for coring in February -April, 2007. The remaining seven holes will be complefed during the summer 2007 project season. A total of four sites will be completed with inclinometers, five sites with piezometers and all the sites will have surface benchmarks. Surface benchmarks aze used to monitor changes in down-dip displacements over time. Data retrieved from inclinometers is deflection of casing as a function of depth below the collar. Plots aze developed of deflection versus depth. Piezometers will be used to monitor water levels. Planned instrumentation is shown in Table 3.3-3 The monitoring frequency for 2007 will be in accordance with the recommendations of Agapito Associates Inc. and is described as follows: It is recommended that measurements on the benchmazks, inclinometers and piezometers should be made on the following schedule: • • Once per month during the dry season • Once per week during the wet spring (April-May) and fall (September-October). • Once per day after major precipitation (rainstorm) events >0.50 inches for 3-4 days transitioning to weekly for 1-2 weeks and back to a normal schedule thereafter. Depending on monitoring results, Agapito Associates may recommend an increase or decrease in monitoring frequency for certain sites. Trapper wit] report monitoring results to DBMS semiannually in conjunction with the annual report in March and again in September. 3-27a Revision: ~ ~ - 9 9 ~~ s~a~ ~ `r 2~~1