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0 <br /> Antonia 'Jorster -2- 8 June 1988 <br /> 2. Deionized water leaching tests should be performed on representative samples <br /> of the treated/fixed wastes to be left in place to confirm mobilities. <br /> Deionized water tests are more representative of in situ conditions than the <br /> DHS Waste Extraction Test (WET) . <br /> 3. Phase II soil sampling results (deeper samples) must confirm the Phase I <br /> (shallow) results for Arsenic, Copper, and Trivalent Chromium. Hexavalent <br /> Chromium results in the deep vadose zone may indicate remedial actions are <br /> necessary. Such actions can be addressed in the final Remedial Action <br /> Plan for the entire site. <br /> 4. The contaminated soils and sludges left in place must not produce or contain <br /> free liquids even after compaction and loading of overburden. Calculations <br /> should be performed to ensure that moisture contents will remain below "free <br /> liquid" levels at the ultimate static and dynamic loads forseeable at the <br /> pond site. <br /> 5. field density testing must be performed more frequently than once per lift. <br /> At a minimum, at least one field measurement per every 10,000 square feet per <br /> lift should be performed. <br /> GAR:ej <br />