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Kearney-KPF 5 13 September 1990 <br /> Modified Closure Plan <br /> is based on field observations that there has been mounding of the <br /> muds in the central portion of the disposal area and that the darker <br /> and denser, non-disced native soils were clearly visible at a depth <br /> of about 15 inches in a hole dug in the landfarmed mud. <br /> Page 9. Soil percolation tests were performed on the native soils and the <br /> results were used in comparison to the laboratory permeability tests <br /> to provide information on the infiltration rates of the native soil . <br /> A discussion on the comparison of the data could not be located in <br /> the text of the report. <br /> GRADING PLAN SPECIFICATIONS <br /> Page 7. Figure 2 shows the final grading plan and indicates that several of <br /> the monitor wells or piezometers will be affected by the <br /> construction of the cover in the pond areas. The Explanation <br /> indicates that the well casings will be extended in these embankment <br /> areas, but the specifics of the well modifications could not be <br /> found in text. Because of the location and construction of these <br /> wells, the current ground water levels and the proposed source <br /> abatement and clay cover, the facility may want to consider <br /> abandonment of some of these wells. If the discharger chooses this <br /> option, a plan for abandonment would need to be submitted for <br /> regulatory review and the proper well destruction reports would have <br /> to be filed with the Department of Water Resources, once the <br /> abandonment is completed. <br /> Page 9. Material (soil ) which has been watered over optimum moisture content <br /> is to be removed and dried. However, if the material is not <br /> excessively over watered but is slightly over optimum, the material <br /> may still be able to be compacted to achieve the desired <br /> permeability and removal of the over watered material may be <br /> unnecessary. <br /> Page 9. Density tests are to be performed using one of three different test <br /> methods. It is preferred that once a test method is selected that <br /> it be used consistently because potential differences in the density <br /> measurements between the test methods and the relationship to <br /> permeability has not been established. <br /> Page 9. The report does not propose any field permeability tests for the <br /> compacted clay cover to verify that the desired permeability has <br /> been achieved. The verification of permeability appears to be based <br /> on the relationship between compaction and laboratory permeability <br /> and not on the direct measurement of field permeability. <br /> CKW:cw <br />