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6 -Right Thickener Underflow Borehole and Pipeline Installation <br />• The proposed drill -pad and light -use road are in areas that have previously been disturbed by County road <br />construction activities. It is unknown whether soil materials were salvaged and replaced in these areas, however, a <br />reclaimed grassland vegetation community exists on a portion of the proposed pad area. The corridor for the <br />proposed thickener underflow pipeline crosses both previously disturbed and existing disturbance areas (mine <br />facilities and railroad construction). For the drill pad, pipeline, and the margins of the light -use road, available soil <br />materials will be salvaged and stockpiled for use in site reclamation. A small temporary soil stockpile will be <br />established adjacent to the pad area for the limited soil (estimated at approximately 300 cy) from the borehole pad <br />and light -use road margins. <br />19RT Mine Dewatering Borehole and Pipeline <br />Given the proximity of existing ranch roads, TCC does not plan or anticipate the need for new road construction to <br />access the 19RT Dewatering Borehole drill -site. With dry ground conditions, drilling equipment and supplies <br />should be able to travel the short distance overland from the existing roads to the drill -site, without significant <br />surface disturbance. Both the shaft pad and pipeline corridor are located in an upland areas. For both the shaft pad, <br />and along the 6,200 -foot pipeline corridor, construction will involve removal of any large vegetation and stripping <br />and stockpiling of other vegetation, soil, and organic materials. Given an average soil depth of approximately 6 <br />inches in the upland areas, a pad area of approximately 0.35 acres, and a total pipeline disturbance area of <br />approximately 7.2 acres, approximately 300 cubic yards of soil material will be salvaged from the pad area, and <br />5,750 cubic yards from the pipeline corridor. Soil from the pipeline corridor will be removed and windrowed along <br />one side of the pipeline corridor, and soil from the pad area will be placed in a stockpile within the borehole pad for <br />future reclamation use. The soil salvage volumes are indicated on Table 49A. Natural vegetative materials (mulch) <br />incorporated into the topsoil, and seeding with the topsoil stockpile stabilization seed mixture, identified on page <br />2.05 -121, will stabilize and protect the stockpiled soil materials. <br />• <br />• <br />TRIO-73 2.05 -84.10 05/21/10 <br />