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i41: I„411.? 9 OVERVIEW OF THE SOLID WASTE M WAGEMENT SYSTEM • The high historical density is believed to be related to the quantity of organics (primarily fruit and other food wastes) in the Indian River County waste stream. These organics have biodegraded over the life of the landfill resulting in subsidence which increases the airspace available for use. As the landfill approaches capacity, waste may not have sufficient time to biodegrade, thus the capacity recovered due to subsidence may not be available for waste disposal. • Indian River County opened a C&D landfill in January 1994. C&D that had been landfilled in Segment II now goes to the C&D landfill, thus changing the waste characteristics of the waste landfilled in Segment II. • Beginning in January 1994, more daily cover material has been placed in Segment II because of changes in the FAC 62-701.500 requirements. Prior to the January 1994 amendments, the "18 -hour rule" had been in effect. This rule exempted areas that would receive additional waste within 18 hours from the daily cover requirement. Based on population projections and the FY 1995 Landfilled tonnage, the Class I waste disposal rate was 1.18 tons per person per year. Using this disposal rate and the remaining disposal capacity of 419,000 cubic yards, Segment II had approximately 21 months of remaining capacity as of October 1,1995, without the infill. If the infill is permitted, the remaining disposal capacity will increase to approximately 1,841,000 cubic yards with a projected life of approximately 7 years. 2.6.2 C&D Landfill CDM estimated that the original design capacity of the C&D landfill including weekly and final cover was 1,186,000 cubic yards. In order to estimate the remaining waste disposal capacity of the C&D landfill, weekly and final cover needs to be taken into account. For purposes of this evaluation, a cover system composed of 6 inches of topsoil and an 18 -inch drainage layer has been assumed as the final landfill cover system. This 2 -foot thick cover system will occupy a volume of approximately 54,000 cubic yards, yielding a disposal capacity of 1,132,000 cubic yards. 2.6.2.1 Landfill Volume Surveys A volume survey was conducted in July 1995 by Masteller, Moler & Reed, Inc. (see Appendix H). The survey report indicated that 76,900 cubic yards of waste had been placed in the C&D landfill as of July 1995. Based on this survey information and deducting for the final :cover system volume, this left approximately 1,055,000 cubic yards of the C&D landfill capacity available as of July 1995. GNV!1000847.00c 2.18 y .yrYsiE; „$n- `.�� .<.��n?;: fry'%u!'+,.- ��,:�.'•'; �.is