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