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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 />,- ill be available for review and it is expected that the <br />expansion landfills and liner systems w <br />technology for vertical expansion liner systems will be firmly established. <br />As previously stated in the Introduetmon,this report should stration of the technical feasibility of the project, but <br />considered an initial evaluation <br />of these settlement issues and a d <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-AAJ3110 Austin Road Landfill Expansion August 2,1995 <br />Landfill Settlement Page 9 <br />MI,I033.DOC <br />