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NORTH THOMPSON CREEK MINE POND CERTIFICATION REVISED SPILLWAY DESIGN Three treatment ponds are located at the reclaimed North Thompson Creek No. 1 Mine site. They are referred to as the long pond and treatment ponds T-1 and T-2. The spillways between the ponds were revised during August and November 1995. Anew 6-inch diameter PVC spillway pipe was installed between the long pond and treatment pond T-1. The existing two four inch diameter spillway pipes were left in place between the long pond and treatment pond T-1 to serve as emergency spillways. The spillway between treatment pond T-1 and T-2 was changed to an open channel spillway.- Anew 6=inch"diameter PVC spillway-pipe was installed between treatment pond T-2 and the discharge point. The two existing four-inch diameter discharge pipes were left in place in treatment pond T-2 to serve as emergency spillways. The design calculations for the revised spillways are presented in Appendix 4-B, Pages P-9-5 through P-9-10. The location and further design information for the ponds are shown on drawing D-2-5, No. 1 Mine Seepage Control and Treatment Pond Plan. in accordance with Division of Minerals and Geology's Rule 4.05.6(10), this certification has been prepared to document the installation of revised spillways for the mine water treatment ponds. I, J. E. Stover, P.E., certified the design of the revised spillways. I have a variety of experience in the design and construction of earth fill embankments and sediment ponds. The spillways were revised during August and November 1995. To the best of my knowledge and belief the revised spillways were constructed in accordance with the approved plan. The design of the spillways meet the requiremen~~Q~EC~ + regulations of the Division of Minerals and Geology. ••~,P~,..••. , tt.~ •o .•S E .~~•,av ~C''iR c^: . ;~ ~~; .z -~5 "ys ~* ; James.• E! Stover ~~:, P.E.;~~ 19230 •T ~~ S •••...•• 6 ~• •:~ONA~~~~~r