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Task 3: Landfill Depletion Model <br />Preparation of the FA and FCA (Tasks 1 and 2) typically rely on total permitted capacity of each <br />cell or segment of the landfill to determine the anticipated closure date for financial planning; <br />however, in reality, the full capacity of a cell cannot be reached until the subsequent cell is <br />constructed to a certain elevation to reach the last of the usable air space in the prior cell. <br />Constructability limits the ability to discretely close one cell before moving to the next cell. The <br />CONSULTANT will utilize a series of tools to model the placement of Class 1 waste to more <br />accurately determine when the next cell must be online in order to maximize the capacity in the <br />active cell. <br />A landfill depletion model will be developed utilizing the following information/tools: <br />1. Historical waste generation data <br />2. Historical in-place densities <br />3. BEBR medium density county population projections (to predict increases in waste <br />generation) <br />4. Excel based landfill depletion model <br />5. Civil 3D surfaces <br />Waste generation will be projected using historical data and adjusted utilizing BEBR population <br />projections to incrementally increase the volume of waste anticipated in future years. Population <br />projection growth will be used with straight line interpolation between data points (BEBR <br />publishes 5 -year increments). Civil 3D surfaces will be generated to simulate placement of <br />waste. Several iterations of surfaces will be prepared to determine the approximate future date <br />when the next cell will be needed. This will be continued to a future data where the in-place <br />waste reaches the permitted capacity of the active cell. CONSULTANT will then work with the <br />COUNTY to back track from that date to determine when planning/permitting and design of the <br />next cell should begin. <br />This task will also include two review/coordination meetings with the landfill's contract operator <br />to gain concurrence on waste placement and operational assumptions. A summary memorandum <br />will be prepared upon completion to document the process. <br />Deliverables <br />Task 1 Table and Working Documents <br />Subtask 2.1 Assurance Form and Escrow Balance and Budget recommendations <br />Subtask 2.2 Survey (as described in MM&T's proposal), remaining airspace and evaluation of <br />compaction <br />Task 3 Landfill Depletion Summary Memorandum <br />Assumptions <br />Information to be provided by the COUNTY includes: <br />• Site access <br />• Escrow account balances <br />Page 3 of 6 <br />