2008-05-07_HYDROLOGY - C1981025 - Laserfiche WebLink

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MINREC, INC. NORTH THOMPSON CREEK MINES IMPOUNDMENT YEARLY INSPECTION In accordance with Rule 4.05.9(14), all impoundments shall be inspected at least yearly to determine if the impoundment has been maintained as designed, and in accordance with the approved plan and the applicable regulations. This yearly inspection is for the impoundments located at the North Thompson Creek Mines. On May 3, 2008, I performed the required yearly inspections. I, J. E. Stover, have a wide variety of experience in the design and construction of earth fill embankments. Nothing was observed during the inspection that would indicate the ponds have a potential for failure. There was no appearance of erosion, instability, structural weakness or other hazardous conditions. There are no required monitoring procedures or instrumentation other than quarterly and yearly inspections. There are no aspects which might-affect stability-and there is~no required maintenance. The-long-pond-and -~ treatment ponds T-1 and T-2 were full as expected with approximate water level elevations of 7522, 7515 and 7511 respectively. T-2 was discharging into outfall 001 at approximately 15 gpm. Sediment pond 9 contained about 2.0 feet of water at approximate elevation of 7498. Water depth in the long pond is approximately 24". Water depth in the treatment ponds T-1 and T-2 is approximately 4 to 5- feet. The impoundments have the following capacities: IMPOUNDMENT CAPACITIES -ACRE FEET Water Sediment Total Long Pond 0.35 N/A 0.35 T-1 0.29 N/A 0.29 T-2 0.24 N/A 0.24 Pond 9 0.53 0.42 0.95 Notes: - ~ -- 1. Capacities are based latest digital topography. To the best of my knowledge~~r;~d~beliefth~~ic~oundments have been maintained as designed and in accordance with the appro~l~r;~arid appl~oa~®I~. regulations. ov°~~v~~Q e e°~ `n';'tr o~~ o~ 0 SI~~~~~ ~° C ~~ ~~`r~rres E. Stover_~~"~~~;0 Date Coloo~F ofess~na~~,~ngineer Regis`~f~iQ~Ef~q, ~ g130