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observed in this drainage during the thirteen years that BMRI has been monitoring flows <br />at the mine site. <br />Drainages intersecting the tailing disposal facility have been diverted via a system of <br />ditches in order to prevent possible commingling with process water. These ditches are <br />provided with energy dissipation structures at regulaz intervals to minimize or maintain <br />erosion and sediment load. <br />4.0 STORMWATER RUNOFF CLASSIFICATION <br />Runoff from various portions of the mine site is segregated into disturbed or undisturbed <br />areas through the use of berms, diversion ditches (earth-lined), and diversion channels <br />(rock protected). <br />Disturbed areas are those that generate runoff considered to be Stormwater (SW) flows, <br />which is subject to the Stormwater Program but is not subject to Effluent Limitation <br />Guidelines (ELG) regulated under 40 CFR Part 440 as Process Water (PW) or Mine <br />Drainage (MD). Undisturbed areas are comprised of Unclassified (UC) flows, which are <br />not subject to the Stormwater Program or 40 CFR Part 440 ELG. Segregation of UC and <br />SW flows from MD and PW flows will ensure that each type of runoff will be handled <br />appropriately. This is an important distinction since runoff subject to 40 CFR Part 440 <br />ELG may require a greater degree of attention. This approach also limits the quantity of <br />water that is subject to ELG. This, in turn, maximizes the return flow to the stream <br />system. <br />Runoff from undisturbed azeas that is designated UC flow will be diverted around <br />process areas via diversion ditches and berms. Sediment due to erosion of the ditches <br />will be removed by utilizing one or more of the BMPs described in this report, and shown <br />in Figures 2 through 5. Runoff from areas designated MD (see Facilities Summary, <br />Table 1) will be collected for treatment utilizing recognized BMPs and will be released in <br />accordance with the Stormwater Regulations and conditions associated with DMG permit <br />requirements. Runoff from areas that may come in contact with product or process <br />Battle Mountain Resources, Inc. Telesto Solutions, /nc. <br />:m lu¢ rro.mwarer mnnagemmt p(am.dx t 3 May 3, 1001 <br />