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1 <br />1 <br />T880161 <br />' The entire stowage void or chamber will be contained within the final pit wall outline <br />and thus evidence of entombed waste and even of the burial site per se will be <br />nonexistent following quarry reclamation. The planned waste stowage site along the <br />' existing quarr}rs east slope will provide containment for waste for some 10 years of <br />plant operation. Waste solids generated in subsequent years of operation will be stowed <br />1 in similar chambers located in the pit slopes as the quarry progresses southward. <br />As noted above, the Pierre Shale Formation is extremely impervious as evidenced by <br />several tests. Table D.1 was extracted from a report prepared for a proposed landfill <br />located in Douglas County on the Pierre Shale Formation. As indicated, permeabilities <br />t were measured by two methods, a packer test and a recovery test. The results <br />indicated show hydraulic conductivities ranging from 10-6 to 10-8 cm/sec. These <br />' extremely low conductivities coupled with the vast thickness of remaining underlying <br />Pierre shale make the quarry an ideal disposal basin. <br />' Additional tests were conducted on-site to confirm that site specific conditions are the <br />' same as in Douglas County. These tests, summarized in Table D.2, show the Pierre <br />Shale Formation at the quarry site to be as impervious as it is in Douglas County. In <br />addition, permeability tests were conducted for compacted shale fines and locally <br />' available clay materials to confirm their utility as impervious capping materials. Results <br />of these tests also are presented in Table D.2. <br /> <br /> <br />L <br /> <br /> <br /> <br />1 <br />-10- <br />1 <br />