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-5- <br /> 25 Document, by data or expert <br /> opinion, that whatever hazardous <br /> constituents are to be left in <br /> place can remain in the closed <br /> surface impoundment without <br /> migrating or posing a significant <br /> hazard. <br /> 28 Identify specific field tests to <br /> be used and the chemical/physical <br /> fixatives being considered. <br /> 30 Provide engineering documentation <br /> to demonstrate clearly that the <br /> cover design would withstand the <br /> maximum credible earthquake load. <br /> Figure 4 a. As previously indicated, recommend <br /> a membrane be placed between the <br /> granular base and clay cap, to <br /> protect the clay cap. <br /> b. Provide calculations used to <br /> determine the volume of soil in the <br /> berms and the resultant depth of <br /> fill when it is compacted in the <br /> impoundment. <br /> 32 Specify field testing to be used to <br /> determine moisture content. <br /> Specify who will do soil <br /> engineering and field testing or <br /> add a statement in the plan that <br /> this information will be provided <br /> to the Department when determined. <br /> 33 Provide a compacted earth barrier <br /> layer to a depth as low as that of <br /> the hazardous waste or document <br /> that the proposed design will <br /> prevent lateral migration of the <br /> remaining hazardous waste <br /> components. (A leachate collection <br /> system may be an alternative.) <br /> 37 Provide engineering documentation <br /> to show that the design of the cap <br /> and cover will support the proposed <br /> post-closure use, without <br /> sustaining damage. Post closure <br />