1994-01-27_REVISION - M1977493 (3)

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SCOPE OF PROJECT Tailing relocation: The tailing is transferred to an existing tailing deposition area utilizing a Hydraulic Monitoring resIurr_y method . High pressure (300-400 psi ) water is used to wash and suspend the tai � inu solids in a slurry mixture wnich is then drawn by an eductor into a slurry pump intake feed tank . A series of slurry booster pumps transports the material uphill through a fourteen- inch (14" ) HDPE pipeline , across the existing No .2 Dam (Robinson Tailing Pond) to the east side of the existing Tenmile Tailing Pond . The slurry is then deposited on the tailing pond utilizing a normal tailing deposition method wherein the suspended solids are precipitated from solution , and the water is decanted for reuse in the process . Dam Modifications: The existing dam was approved as a water storage structure by the State Engineer in 1979 . Upon completion of the tailing removal , outlet facilities will be constructed through the existing dam. Design of the ancillary structures is in progress and approval by the State Engineer will be sought prior to construction . The feasibility of future enlargement of the existing dam is also beinq evaluated at this time . Construction Site Reclamation: Upon Completion of the tailing reclamation , all sites including the slurry pipeline/transfer station route , water supply pipelines , access roads , and diversion facilities disturbed by the project will be graded , back- fiiiec , recontoured , ana seeded/ revegetatec as per MLRD specifications . A, Surface Water Impact: viaring the tali n9 relGcation process , and subsequent reclamation activities , ditches and culverts have , c,+- will be , installed to prevent any contamination from entering the existing interceptor canals or other fresn water tributaries or otherwise impacting "Waters of the State" . - 4 -