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Geosyntee Consultants <br /> 7. SUMMARY AND CONCLUSIONS <br /> This study compares the advantages and disadvantages of C&D debris disposal in a <br /> dedicated unlined landfill with those of co-disposal of C&D debris and MSW in a lined, <br /> Class I landfill . Florida rules approve both methods of disposal and each landfill <br /> facility owner can select the one most appropriate to their circumstances. Presently, the <br /> SWDD employs the separate disposal alternative whereby C&D debris is disposed of in <br /> an unlined C&D landfill operated by SWDD staff. MSW is disposed off in a lined, <br /> Class I landfill operated by Waste Management under a seven (7) year operating <br /> agreement with the SWDD Board. The cost for construction and operation of the <br /> unlined C&D landfill is determined by the SWDD ' s annual budget, which is required to <br /> fund all labor, equipment and administration expenses associated with this facility. The <br /> total cost for operating the Class I landfill consists of construction and closure expenses <br /> including long term care, estimated at $6 . 87 per ton landfill capacity; and the operation <br /> and maintenance cost determined by the disposal fee, which is defined by the operating <br /> agreement, and the quantity of MSW delivered for disposal. <br /> The economic analysis results indicate that the cost advantage or disadvantage of a <br /> particular method of disposal depends on the quantity of C&D waste delivered to the <br /> landfill . The SWDD funding method of an annual budget is less costly only when the <br /> quantity of C&D debris delivered for landfill disposal exceeds a minimum value. For <br /> the SWDD operating budget, this critical quantity is estimated at approximately 93 ,000 <br /> tons per year and is projected statistically to be reached in 2018 . Below this amount, it <br /> would be less costly to co-dispose the C&D debris in the Class I landfill along with <br /> MSW . The County could still experience years with C&D debris in excess of the <br /> critical amount prior to 2018 due to the occurrences of uncontrollable events such as <br /> hurricanes or periods of exceptionally high economic growth. However, based on past <br /> records, such quantities cannot be sustained by the projected County population until <br /> 2018 . <br /> The estimated crossover year of 2018 could change by any of the following events : <br /> • Different population growth rate. Higher rate of growth would advance the <br /> crossover year whereas a lower rate would distance it. <br /> • Change in operating cost of the Class I landfill . Increase in the contract fee <br /> to WM would advance the crossover year. <br /> • Establishment of a competing C&D debris recovery facility would distance <br /> the crossover year. <br /> JR70184 9 7/ 13/2007 <br />