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u~.w..vouHn <br />,~„~. ~, <br />QED Jo0 Na 6A7 <br />~~0~ 4 <br /> <br />inexpensivelyrf a survey is performed. We also point out that during the last <br />approximate 14 years of existence and the (DMG) reporting of "without evidence of <br />problems, other than minor erosion" indicates a certain level of demonstration of stability <br />,a of the existing stockpile. In our experience, slope distress of similar granular soil <br />~+ masses has taken the appearance of gradual and increased sloughing and eventual <br />i1 colluviai outwash. We believe this type of failure mode may be noticeable prior to <br />~ impacting Highway 141. Primary impacts might inGude collection of outwash in the <br />~ drainage ditch along the side of the roadway. <br />., <br />Rock Roll Out Analysis <br />The DMG memo requested additional information regarding the analysis <br />performed for rock roll out at the high wall area. Appendix A (attached) includes input <br />'.~' and output data from the iterations reported. <br />w <br />Reclamation of 1.Oh: 1.Ov Soit Escarpment on Parcet B <br />~~ <br />The DMG memo requests additional analysts be performed on Parcel 8 of the <br />permit area. Geotechnical Engineering Group, Inc. is not aware of a Parcel B area and <br />has not performed investigations to date of the Parcel B area. We would be happy to <br />pertorm additional investigations as requested. <br />.~ <br />~~, This letter is transmitted as an addendum to the Geotechnical Investigation, <br />Phase 2 report dated January 19, 2001. The previous report, in its entirety, should be <br />•^- reviewed along with this addendum. ,This addendum is subject to the same limitations <br />.i as described by the previous report. If we can answer any questions or be of further <br />service, please call. <br />UP, INC. <br /> <br />Principal Engineer <br />a< <br />(3 copies sent) <br />