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r <br /> Geo syntec -Consultants <br /> r 7. SUMMARY AND CONCLUSIONS <br /> This study compares the advantages and disadvantages of C&D debris disposal in a dedicated <br /> r� unlined landfill with those of co-disposal of C&D debris and MSW in a lined, Class I landfill . <br /> Florida rules approve both methods of disposal and each landfill facility owner or operator can <br /> select the one most appropriate to their circumstances. Presently, the SWDD employs the <br /> r separate disposal alternatives whereby C &D debris is disposed of in an unlined C&D landfill <br /> operated by SWDD staff. MSW is disposed off in a lined, Class I landfill operated by Waste <br /> r Management, Inc. of Florida (WMIF) under a seven- (7-) year operating agreement with the <br /> SWDD Board. The cost for construction and operation of the unlined C&D landfill is <br /> determined by the SWDD ' s annual budget, which is required to fund all labor, equipment and <br /> +■ administration expenses associated with this facility. The total cost for operating the Class I <br /> landfill consists of construction and closure expenses including long term care, estimated at <br /> $ 6 . 87 per ton landfill capacity; and the operation and maintenance cost determined by the <br /> r disposal fee, which is defined by the operating agreement, and the quantity of MSW delivered <br /> for disposal. <br /> r <br /> The results of the economic analysis indicate that the cost advantage or disadvantage of a <br /> particular method of disposal depends on the quantity of C&D debris delivered to the IRCL <br /> r facility. The SWDD funding mechanism of an annual budget is less costly only when the <br /> quantity of C&D debris delivered for disposal exceeds a minimum value. For the SWDD <br /> operating budget, this critical quantity is estimated at approximately 93 ,000 tons per year and is <br /> projected statistically to be reached in 2018 . Below this amount, it would be less costly to co- <br /> dispose the C&D debris in the Class 1 landfill along with MSW . The County could still <br /> r experience years with C&D debris in excess of the critical amount prior to 2018 due to the <br /> occurrences of uncontrollable events such as hurricanes or periods of exceptionally high <br /> economic growth. However, based on past records, such quantities cannot be sustained by the <br /> r projected County population until 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 crossover <br /> - year whereas a lower rate would distance it. <br /> • . Change in operating cost of the Class I landfill — Increasing the contract fee to WMIF <br /> - would advance the crossover year. <br /> • Establishment of a competing C&D debris recovery facility would distance the <br /> r <br /> crossover year. <br /> FL0996-03UL70184 08- 10-200Zdoc_doc 7- 1 2007-08- 10 <br /> r <br /> r <br />