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ARCOSA <br /> then be monitored on an annual basis during the life of the mining permit or until a parameter is <br /> identified above an applicable regulatory limit. The samples collected at the monitoring well will be <br /> analyzed for constituents previously identified in laboratory analysis of waste material leachate and <br /> water within the quarry. These constituents include: antimony, arsenic, boron, iron, manganese, <br /> selenium, and thallium. Monitoring will commence within six(6)months following the issuance of the <br /> mining permit. <br /> As noted above, the Pierre Shale Formation is extremely impervious as evidenced by several tests. <br /> Table D.1 was extracted from a report prepared for a proposed landfill located in Douglas County on <br /> the Pierre Shale Formation. As indicated, permeabilities were measured by two methods, a packer test <br /> and a recovery test. The results indicated show hydraulic conductivities ranging from 10-6 to 10-8 <br /> cm/sec. These 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 same as in <br /> Douglas County. These tests, summarized in Table D.2, show the Pierre Shale Formation at the quarry <br /> site to be as impervious as it is in Douglas County. In addition, permeability tests were conducted for <br /> compacted shale fines and locally available clay materials to confirm their utility as impervious capping <br /> materials. Results of these tests also are presented in Table D.2. <br />