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Pond Sealing <br />Because of the potential for local ground water contamination, the sediment <br />pond will be sealed. <br />Following sealing, a pond leakage study will be performed. This two week <br />study was conducted June 16 to July 1, 1986. Results from the study indicated <br />estimated pond leakage to be less than evaporation amounts. Based on this <br />study it was determined that pond sealing efforts were acceptable. Continued <br />monitoring of the effectiveness of the pond seal will be observed and reported <br />in quarterly pond inspection reports. <br />• <br />Diversian and Collection Ditches <br />A number of diversion and collection ditches have been designed and will be <br />constructed as part of the drainage and sediment control plan. Ditch Nos. 1, <br />2 and 3 are located to intercept runoff from the undisturbed areas and divert <br />this water at the perimeter of the disturbed area. Ditch Nos. 4 and 5 collect <br />runoff from the disturbed area and route this flow to the sediment pond. <br />Collection ditches at the base of soil substitute stockpiles contain the <br />runoff and the sediment within these areas. Locations of ditches are shown on <br />Map 12, Coal Gulch Mine Facilities. Typical cross sections are shown on <br />Figure 3, Typical Diversion Ditch Cross Sections. Design calculations are <br />• Revised 9/12/86 <br />5 <br />