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. J _ * III 1111111111111111 ~ Y t STATE OF ' MINED LAND RECLAMATION DIVISION Department of Natural Resources 1313 Sherman 51., Room 215 Denver, CO 80203 303 866-3567 FA X. 303 832-8706 DATE: June 20, 1990 T0: Larry Oehler /~~1/~ FROM: Steve Renner`~~~' ~-~- RE: Reclamation Resources, Inc. (File M-85-029) I have reviewed the Reclamation Resources, Inc. (RRI) slope stabil submitted June 8, 1990. This report was meant to address our coot expressed at the May Board meeting, and in nU' May 24, 1990 memoran The June 8, 1990 report states that significant reconstruction of embankment has been accomplished. The embankment is now construe the in and out slopes are at a 3:1 configuration. This is consis construction recommendations in the Bureau of Reclamation Publica of Small Dams (USER, 1987), In addition soils density and compac were submitted. At the May Board meeting, and in my May 24, 1990 memo, the need f stability analysis was discussed. Essentially, it was felt that assumptions made in the first analysis were incorrect, given actin conditions. The Division determined that a new analysis was nece order to make the findings that the operation would not impact th balance, and that off site areas would be protected from damage. The information presented in the June 8, 1990 report does not add stability concerns, and may actually raise some additional tooter Division specifically requested that the stability analysis be re given site specific conditions. We also requested that the assum in the analysis be documented in the report. The slope stability required of virtually every applicant who proposes a water detent at a mining operation, This analysis is necessary in order to mal determinations that the hydrologic balance will be minimally impa operation (34-32-]16(7)(g)), and that sites outside the affected protected from slides or damage (34-32-116(7)(h)). Without a def statement as to the stability of an embankment, these findings ca. The June 8, 1990 report characterized the embankment as an homoge structure constructed of Sandy Silty (SM) and well graded sands x (SW). The Bureau of Reclamation (1987) indicates that the SW soi unsuitable for use in homogenous embankments, Reclamation Resour discuss the relative percentages of the SW and SM materials used embankment construction. Additionally, the Bureau of Reclamation pF CO~Oq ~~ Yp ~` ~ ~S • ~ o ~ 1876 s Roy Romer, Governor Fred R. Banta, Division Director repor t he pond d so that nt with on, Design on data a revised ome of the site any i n hydrologic ess our s. The evaluated Lions used analysis is on facility e the ted by the rea will be nitive not be made. ous type th few fines is es should n the (1987) also