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0 <br />August 2,1995 <br />Michael L. Miller <br />Solid Waste Manager <br />Department of Public Works <br />City of Stockton <br />425 North El Dorado Street <br />Stockton, California 95202-1997 <br />Dear Mr. Miller: <br />Subject: AUSTIN ROAD LANDFILL EXPANSION - <br />LANDFILL SETTLEMENT LETTER REPORT <br />1.0 INTRODUCTION <br />The purpose of this letter report is to evaluate the effects of differential settlement on the <br />landfill liner system and final cover for the Austin Road Landfill Expansion, as required by the <br />California Code .of Regulations. CCR 14 17776 requires an evaluation of the final site <br />configuration to determine .the anticipated differential settlement during the post -closure <br />period. CCR 23 2597(a)(8) requires an evaluation of anticipated settlement due to <br />decomposition and compaction of wastes and subsidence of underlying natural geologic <br />materials. This report is to be used as supporting analysis for the Austin Road Landfill <br />Expansion Report of Disposal Site Information (RDSI) and Preliminary Closure and Post - <br />closure Plans. <br />The Austin Road Landfill Expansion is planned to be sequentially developed in a series of <br />Phases. Phases I through IV are referred to as the horizontal expansion. The horizontal <br />expansion landfill liner system will be constructed- over native soil material. Phases V and VI <br />are referred to as the vertical expansion. The vertical expansion liner system will be <br />constructed over the final cover of the existing Austin Road Landfill. Figure 1 shows the <br />horizontal and vertical expansion site plan, and Figure 2 shows a typical section through the <br />existing landfill, the horizontal expansion landfill, and vertical expansion landfill. <br />The primary issues in regard to differential settlement identified for the Austin Road Landfill <br />Expansion are: <br />■ Changes in final closure grades due to settlement. <br />■ Possible loss of liner or cover integrity due to settlement. <br />■ Changes in vertical expansion liner and leachate collection system grades due to <br />settlement. <br />WW-1811-CAI-AA/3110 Austin Road Landfill Expansion August 2,1995 <br />MLI033.DOC Landfill Settlement Page 1 <br />