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<br />compaction. Controlled routing of the equipment over the filled material as it is <br />placed, will be adequate to ensure slope stability. <br />Once the initial mine phase area is mined out, construction of the separation <br />berm will be initiated. The applicant proposes to utilize shale materials from the <br />pit floor to construct this low permeability separation berm. The sand and gravel <br />at this location is underlain by Pierre Shale, which is known, based on testing at <br />numerous other sites, to be a suitable material from which to build impervious <br />liners and embankments. <br />Once the mining has proceeded to expose sufficient materials to comprise <br />representative test samples, samples of the shale materials will be submitted for <br />detailed testing to confirm its suitability for the intended berm construction. <br />Overburden and topsoil stripped from the Phase II mine area will also be used in <br />the berm construction to cover the impervious core and provide plant growth <br />media. Finally, the faces of the embankment will be armored with riprap to <br />prevent wave-induced erosion. <br />Mining Seouence <br />Mining will proceed in two phases as shown on Exhibit C-1. The first phase, <br />consisting of approximately 30 acres, will encompass the northwestern pond <br />area and sufficient space to allow construction of the separation berm. The <br />second phase, consisting of about 26 acres, will encompass the southeastern <br />pond area. <br />is <br />