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Risk Assessment <br />Due to humus and fine grain content of the topsoil, erosion is very possible for this type <br />of material. Measures therefore have been instituted to prevent erosion of the topsoil <br />stockpiles, not only to reduce the sediment load from reaching surface waters but also to <br />prevent loss of topsoil to be used during final reclamation. <br />Applicable BMPs and Good Housekeeping Practices <br />Diversion structures have been installed adjacent to and downgradient to divert <br />stonnwater away from topsoil stockpiles. This minimizes the amount of stormwater <br />coming in contact with the topsoil and reduces the possibility of erosion. However, <br />revegetating topsoil stockpiles is the most effective method of controlling sedimentation. <br />The following BMYs are used, as appropriate, to remove sediment from the runoff of <br />topsoil stockpile areas: <br />1. Topsoil stockpiles are vegetated with stabilizing grasses in an effort to reduce <br />possible erosion. <br />2. Tae ditches, berms, rock check dams, and collection ponds installed at the <br />base of the topsoil stockpile areas aze maintained on a regular basis. <br />6.10 Haul Road <br />Source <br />The primary source of potential stormwater contamination is from sediment generated <br />during storms. The haul road area is constructed with safety berms on either side of the <br />roadway in accordance with MSHA regulations. These berms serve a dual purpose by <br />not only preventing haulage equipment from running off the road but by also preventing <br />stormwater, which may contain sediment, from draining freely into surface waters. As <br />described in the Mine Area section (Section 6.1) and previous discussions associated with <br />haul roads, the haul road section north of the county road has been incorporated in the <br />post-reclamation East and West Pit stormwater system and the section of roadway south <br />of the county road will be reduced in width and left in place to allow access to the <br />CCNRCS industrial park area. <br />Battle Mountain Resources, lnc. Tefesto Solutions, Inc. <br />' .4nt,,;.,~o,m~~er ma~aseme,~Pm~.da 24 May 3, 1002 <br />