Laserfiche WebLink
MINREC, INC. <br />NORTH THOMPSON CREEK MINES <br />IMPOUNDMENT YEARLY INSPECTION <br />RECEIVED <br />APR 0 7 X003 <br />Dryision ollNlnerals S Geplo9Y <br />In accordance with Rule 4.05.9(14), all impoundments shall be inspected at least yearly to determine <br />if the impoundment has been maintained as designed, and in accordance with the approved plan and <br />the applicable regulations. This yearly inspection is for the impoundments located at the North <br />Thompson Creek Mines. <br />On March 17, 2003, I performed the required yearly inspections. I, J. E. Stover, have a wide variety of <br />experience in the design and construction of earth fill embankments. Nothing was observed during the <br />inspection that would indicate the ponds have a potential for failure. There was no appearance of <br />erosion, instability, structural weakness or other hazardous conditions. There are no required <br />monitoring procedures or instrumentation other than quarterly and yearly inspections. There are no <br />aspects which might affect stability and there is no required maintenance. The long pond and <br />treatment ponds T-1 and T-2 were full as expected with approximate water level elevations of 7522, <br />7515 and 7511 respectively. T-2 was discharging into ouffall 001 at approximately 20 gpm. Sediment <br />pond 9 contained about 24-inches of water at approximate elevation of 7497. The refuse pile <br />sediment pond was damp with puddles and snow covered the north facing embankment. Water <br />depth in the long pond is approximately 24". Water depth in the treatment ponds T-1 and T-2 is <br />approximately 4 to 5-feet. <br />The impoundments have the following capacities: <br />IMPOUNDMENT CAPACITIES -ACRE FEET <br /> Water Sediment Total <br />Long Pond 0.35 N/A 0.35 <br />T-1 0.29 N/A 0.29 <br />T-2 0.24 N/A 0.24 <br />Pond 9 0.53 0.42 0.95 <br />Refuse Pile 0.81 0.50 1.31 <br />Notes: <br />1. Capacities are based latest digital topography. <br />To the best of my knowledge a~~~a~~f the impoundments have been maintained as designed and in <br />accordance with the approy~~pldtf~~gplicable regulations. <br />i ~~•`F,S T2<, f <br />:U'~~~~~~~~ 433 <br />~ * ; Ja safer" €: Stove,"r ~ ate <br />~~q~orado Professiou~Engineer <br />!,YAI 6, <br />