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13	Operations Management
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18	Benefits of a Bioreactor Landfill Operational savings for leachate transportation and treatment Increased Density – 10 to 20 % = More capacity Quicker gas capture drastically improves economics of landfill gas to energy Potential lower long-term liability
19	Base Model The existing base model will be a comparative model, using the slightly modified landfill capacity that we have calculated No changes are to be made to the current base model configuration other than reduce the Base Case clay layer in the secondary liner to 2 feet to correspond to the Model 1 & 2 scenarios. Minor changes will be made to the base model data to reflect our interpretation of the mapping and make it more comparable with our alternatives calculations. The current base model data will be included in the revised economic model. A cost of $0.20 per gallon to treat leachate will be used based upon the average costs of 1996 and 1997, when leachate strength was most representative of newer waste. A 25% contingency will be used for construction costs and a 15% contingency will be used for operating costs. These will be accounted at the end of the calculations rather than by line item.
20	Model 1 – Intermediate Build-Out The following alternatives will be used in Model 1: Final grades for a 10-foot perimeter wall will be used. Slopes consistent with base model. No change in site geometry from the base model. Biostabilization assumes 15% by volume settlement of the in place waste due to the accelerated decomposition of the putrescible waste. Base liner as described above. Final Cover as described above. Deep Liner with Groundwater Control System as described above. Alternative daily will be used in both Models 1 and 2 at a rate of 10% of total volume. No waste processing.
21	Model 2 – Maximum Build-Out The following alternatives will be used in Model 2: Final grades for a 20-foot perimeter wall will used for Model 2 Final grades for the slope-optimized alternative will be extended at a 3H:1V slope 10 feet higher than the added effects of the walls, i.e. 30 feet higher than the Base Model and 20 feet higher than Model 1. No change in site geometry from the base model Biostabilization assumes a 15% by volume settlement of the waste in place due to the accelerated decomposition of the putrescible waste. Base liner as described above Final Cover as described above Deep Liner with Groundwater Control System as described above Alternative daily will be used in both Models 1 and 2 at a rate of 10% of total volume. No waste processing.