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■ Consideration should be given to developing soil stockpiles on the existing landfill <br /> during the operation of the landfill horizontal expansion to provide for preloading <br /> consolidation prior to the vertical expansion liner construction. Dynamic <br /> compaction should be considered in local areas where the effects of settlement may <br /> be more critical,such as along leachate collection trench alignments. <br /> ■ Additional geotechnical field work and settlement analysis should be conducted to <br /> determine the settlement characteristics of the horizontal expansion subgrade prior <br /> the final liner design. <br /> 7.0 CONCLUSION <br /> Based on the analysis of this report, it is R. W. Beck's opinion that the Austin Road Landfill <br /> horizontal and vertical expansions are technically feasible and that adequate design methods <br /> and landfill technologies are available to assure the long-term environmental performance of <br /> the landfill. A primary concern will be the performance of the vertical expansion liner. <br /> However, the proposed method of developing the horizontal expansion areas prior to the <br /> vertical expansion areas is expected to mitigate potential problems from decomposition <br /> settlement and will allow for an extended period of time to collect settlement data on the <br /> existing landfill and possibly surcharge areas with soil stockpiles. Also, by the time of the final <br /> design for the vertical expansion phases, a number of long-term case histories for vertical <br /> expansion landfills and liner systems will be available for review and it is expected that the <br /> technology for vertical expansion liner systems will be firmly established. <br /> As previously stated in the Introduction, this report should be considered an initial evaluation <br /> of these settlement issues and a demonstration of the technical feasibility of the project, but <br /> does not constitute a final design analysis for the landfill expansion liner or cover system. <br /> Additional design analysis and geotechnical studies will be required, prior to final design of the <br /> horizontal and vertical expansion liner and final cover systems. References and calculations <br /> are attached to this letter. <br /> If you have any comments or questions related to this report, please contact me at your <br /> convenience. <br /> Very Truly Yours, <br /> R. W. BECK <br /> Mark Ingham <br /> Project Engineer <br /> Attachments <br /> WW-1811-CAl-AA/3110 Austin Road Landfill Expansion August 2,1995 <br /> ML1033.DOC Landfill Settlement page 9 <br />