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APPEF7DI~ DD <br />Straw Dike Specifir_ation <br />• Purpose: Straw dikes are an integral part of the overall <br />drainage control plan and sediment control measures at <br />Colorado T9estmoreland Inc., Orchard Valley Mine. The <br />purpose of this specification is to standardize usage <br />and construction of straw di}:es. DiY.es are to conform <br />to 30 CFR 817.45. <br />Usage: Straw dikes will be used at, but are not limited <br />to use at, the following: <br />1. Areas where sediment transport by surface water is <br />deemed low by Colorado Sdestmoreland's Professional <br />Civil Engineer. <br />2. Areas •,:here runoff is not directed into <br />sedimentation ponds. <br />3. Areas where temporary construction might <br />significantly raise sediment volume. <br />Construction: Straw dikes will be constructed as follows: <br />1. ee anchored to the ground by roof bolts (rebar) <br />so stability of the dike is assured. <br />2. Be placed on level ground so all water is <br />filtered. <br />3. Use straw bales of best quality available. <br />4. Be constructed and inspected after placement under <br />the direction of a Cv7I engineer for stability and <br />filtering capacity. <br />See Figure 1 for construction requirements. <br />In~;:. r-~tionc All di;;es will be ins_,rc t~~d ciuarte rly for the <br />following: <br />1. Stability <br />2. Filtering capacity <br />• 3. Erosion around di}:e <br />4. Scdimr~nt below dike <br />Lny di~:es •.aill be replaced as the ~=ngineer deems <br />nr~c„ ;s.~i y. <br />