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2.05.3 <br />Three or more gob vent boreholes GVBs are required over each longwall <br />panel. Additionally, exploratory holes will be drilled within the permit <br />boundary. Run -off from the related drill pads may not go through a treatment <br />facility such as a sediment pond. Run -off from the pads that does not report <br />to a sediment pond will be filtered through a sediment fence or straw logs. <br />Straw logs will be a minimum six inches in diameter. Design of sediment <br />fences for drill pad configurations are presented in Volume III, Exhibit 8 <br />beginning on pages Exh -8 -107 and Exh -8 -223. Refer to page Exh- 8 -106i for <br />a discussion of the straw log substitute for silt fences. The three typical drill <br />pads are designed on a 3H:1 V slope, 5H:1 V slope and 10H:1 V slope. The <br />typical sediment fence configuration, berms and ditches for the various <br />slopes and pad sizes are shown on Maps 36, 36a and 36b. The following <br />table lists each drill hole and its design drill pad: <br />MR -136 2.05-43- 06/13 <br />