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~.. October 20, 1980 ' Department of Natural Resources Re: MLRB. File No. 80-47 ' Page Three (g) Aoproved temporary seed mixes may be used on areas likely to be redisturbed within five years of the initial work on these sites. Areas not subject to redisturbance for five or more •~ears including, but not limited to, topsoil stocknilPS and road embankments will be seeded with permanent seed mixtures. Temporary and permanent seed mixtures listed in the application, as supplemented by the Agency and Operator's correspondence, are deemed "approved". This list may, from time-to-time, be amended and supplemented by the operator with the consent of the Staff Director. (2) With respect to Pir. James Pendleton's memorandum of September 15, 1980 to Mr. James McArdle, the operator commits to the following: ~7i (a) The operator will, within two (2) years of the issuarce of this ~~ permit conduct an.investieation of the geologic, hydrogeologic and surface hydrologic characteristics'of the proposed spent shale ~,} disposal area. Results of this study will be included in the operator's annual report for 1982. No spent shale shall ~e dis- posed of until the Staff Director reviews the final design of the spent shale disposal pile. (b) The operator will conduct additions characteristics of spent shale, its density to determine the effects of spent shale pile, and to verify the -properties assumed in the stability spent shale disposal area. L studies of the physical sheer strength and the material possible subsidence upon the accuracy of the material analysis and design of the (c) The operator will conduct a subsidence monitoring program consistent with sound engineering practices which will be undertaken generally to monitor the following parameters: (1) ore zone and overburden rock mechanics properties; (2) ground surface deformation and angle of drew; (3) soil mechanics properties of surficial material (to the extent not adequately covered in the studies referred to in item (a) above); and (4) hydrogeological properties of bedrock and surficial materials (to the extent not adequately covered in the studies referred to in item (a) above). (d) The results of rock mechanic monitoring programs to be conducted by the operator during the course of mining operations will b? made available to the Staff Director, upon request. (e) The operator will conduct a processed shale embankment monitoring program consistent with sound engineering practices which will be undertaken generally to monitor the following parameters: