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FROM :'NATURAL RESOURCES SEC. 303 866 3SS8 199S.10-10 11:19 #846 P.05/07 <br /> 3Ci: 1 IUN 2 <br /> Explanation of Work Perfor med •►., <br /> Minor Revision #43, issued September 27, 1993, approved "rip-rap stabilization <br /> in dutch Creek." Se-- photographs, Attachment 2-A. <br /> 2.3.2 Flume Prc ject <br /> The Dutcr Creek flume is a concrete structure through which dutch <br /> Creek, a F erennial stream, flows across the central yard area. The <br /> concrete s tructure was installed some years ago to prevent <br /> downcuttir g and erosion of the yard and nearby refuse pile by the <br /> stream. <br /> Abatemen, of Notice of Violation C-93-086 required that the flume be <br /> patched tc prevent leakage. However, further work was needed to <br /> ensure tht t problems not occur in future. <br /> The Divisi m of Minerals and Geology approved a minor revision <br /> (included :as Attachment 2 A) in the fall of 1993 for modifications to <br /> the flume. The approved'plan called for installation of a supporting <br /> pillar benE ath the flume structure to provide additional support; <br /> installation i of a 9' diameter steel tube in the flume; installation of <br /> headwalls to direct flows into the tube. <br /> Completio i of the work approved in the plan required extensive work, <br /> done at th a low flow period of the year, and was completed on <br /> December 30, 1993. Further monitoring and maintenance of the <br /> :,tructure was done the winter and spring of 1994. <br /> A photographic record of the project is included at Attachment 2-B. <br /> 2.3.3 f Aaintenat,ce - Mine Site <br /> Among the chief requirements for maintaining the mine site in <br /> ompliance with applicable regulations was clean-out of sediment <br /> ponds which had reached capacity. This entails removing the <br /> Iccumulated sediment from the pond(s) by a dragline, and in turn <br /> rucking tf a muck to an approved disposal area. The crew assisted <br /> with move-in and set-up of the dragline, and hauled the muck, using <br /> the dump i.rucks rented from Pitkin Iron. <br /> 2.3.4 fllaintenance/Repairs - Equipment <br /> Page 4 <br />