SITE INFORMATION AND CORRESPONDENCE_1987-1992

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DRAFT all well casings should be punctured or ripped and the formation pressure grouted throughout this zone up to the depth of the existing grouts . He also noted that LVMD6 had a PVC liner installed to a depth of 254 feet with the annular space between the outer casing packed with sand. His recommendation was that this PVC liner and the sand pack be removed, then proceeding with the puncturing the casing and pressure grouting. Kennedy/Jenks had no recommendations regarding LVMD4 as it is not within LVC' s area of concern. Having read the Draft Engineer' s Estimate and Technical Specifications referenced above, the Environmental Health Division has the following comments and recommendations . * The report had no summary statement as to what is being done and what they expect to accomplish. * The disposal of contaminated soil to a Class III landfill, as indicated on Page 3 , is unacceptable. It must go to an approved disposal site based on the test results . * The preliminary draft, dated March 3 , 1992 , had estimates for soil and water sampling, a site safety plan, and permitting costs . These areas were not covered in the subsequent draft dated March 17, 1992 . * We would like to discuss with the consultants the viability of using bentonite chips to fill the uncased well holes versus the use of the proposed neat cement for filling these voids to the beginning of the steel well casings . * It is not clear whether LVMD1 will be ripped and effectively pressure grouted to at least 180 feet. * Unless the consultant can demonstrate that the PVC casing and the steel casing in LVMD6 can both be effectively punctured and grouted throughout the annular space and sand between the two casings, we feel, as Kennedy/Jenks, that the PVC casing and sand should be removed prior to puncturing the outer casing and pressure grouting. * We agree with Public Works that specification should be spelled out for the neat cement, equipment used (particularily for the ripping tool) , and the pressure grouting techniques used. At this stage, we would recommend that representatives from Brown and Caldwell meet with Public Works and Environmental Health representatives to discuss the proposal .