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September 2009 Foidel Creek Mine * Refuse Disposal Area Expansion — Surface Water Control Plan * Page 2 <br />• o reclaimed area — previously reclaimed condition, good herbaceous cover; CN value <br />= 74 <br />3.0 Channel Designs <br />• <br />0 <br />Two types of channels will be used to control surface runoff at the refuse disposal area: temporary <br />ditches and postmine channels. A temporary ditch is characterized as a diversion structure necessary <br />to route surface runoff during the initial sequence of the pile's construction. The temporary ditches <br />will be abandoned as the refuse disposal area expands to full build -out. A postmine channel is <br />characterized as a diversion structure that is expected to remain as a permanent, postmine feature. <br />Table 1, Refuse Disposal Area Channel Sequencing, identifies the refuse disposal area diversion <br />structure and if the diversion structure is a temporary ditch or postmine channel. In addition, the <br />table notes if the diversion structure is needed at the time of initial refuse pile construction or as the <br />pile expands towards final build -out and closure. <br />TABLE 1 <br />REFUSE DISPOSAL AREA CHANNEL SE UENCING <br />Channel <br />Construction Timing <br />Type <br />RDA -lb <br />existing <br />postmine channel <br />RDA -lc <br />existing <br />postmine channel <br />RDA -ld <br />existing <br />ostmine channel <br />RDA -le <br />existing <br />postmine channel <br />RDA-If <br />closure <br />postmine channel <br />RDA -3 <br />existing <br />postmine channel <br />RDA-4 <br />initial sequence <br />temporary ditch <br />RDA4a <br />initial sequence <br />temporary ditch <br />RDA -5 <br />initial sequence/closure <br />postmine channel <br />RDA -5a <br />initial sequence/closure <br />postmine channel <br />RDA-5b' <br />closure <br />Postmine channel <br />RDA -5c <br />closure <br />postmine channel <br />RDA -6 <br />initial sequence/closure <br />pos tnrine channel <br />RDA -7 <br />initial sequence/closure <br />posbnine channel <br />RDA -10 <br />initial sequence <br />temporary ditch <br />RDA -11 <br />initial sequence <br />temporary ditch <br />BD -1 <br />initial sequence bench/closure <br />postmine channel <br />BD -2 <br />initial sequence bench/closure <br />postmine channel <br />BD -3 <br />closure bench <br />postmine channel <br />BD4 <br />closure bench <br />postmine channel <br />BD -5 <br />closure bench <br />postmine channel <br />BD -6 <br />top of pile, closure <br />postmine channel <br />Notes: `BD" — bench ditches; bench ditches will be constructed at 50 feet vertical intervals as necess <br />Hydro - Environmental Solutions, Inc. <br />57 10 th Street, Suite B <br />P.O. Box 772996 <br />Steamboat Springs, CO 80477 <br />Revised 09/09 <br />