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Mr. Himanshu Mehta, P.E. 26 February 2008 Page 3of11 permitted capacity extends the life of the Class I landfill until January 2011, based on current and projected waste acceptance rates. As previously discussed, the current FDEP permits for C&D placement on Segment 1 with 5 percent top deck slopes would reach final grades in March 2009 before the Class I landfill vertical expansion can be constructed. However, the vertical expansion represents the next phase of the scheduled capacity additions to the Class I landfill. Its projected delay due to the decline in the deliveries of C&D debris for landfill disposal, places it on the critical path of the capacity addition schedule. SWDD requested that Geosyntec modify the vertical expansion design to allow for earlier start of the construction date. The outcome of such modification would be to increase the disposal capacity of the Class I waste at the expense of the unlined C&D disposal area. However, since the SWDD Board has made the decision in August 2007, as part of Amendment to Work Order No. 4, to discontinue the separate disposal of C&D debris in unlined landfill cells, this design modification would be in line with the Board directive to be protective of the environment. The IRCL facility is currently regulated under the New Source Performance Standards (NSPS) for municipal solid waste (MSW) landfills as identified in Subpart WWW of 40 CFR, Part 60 (Subpart WWW). The NSPS states that MSW landfills that exceed certain size thresholds (waste -in-place of more than 2.5 million Mg or 2.5 million m3) or emission thresholds (emissions of non -methane organic compounds of greater than 50 Mg/yr) are required to collect and control its landfill gas. Currently, the IRCL does not exceed the thresholds prescribed by NSPS; however, the IRCL has a voluntarily -installed active gas collection and control system (GCCS), which includes 40 vertical gas collection wells, 13 horizontal gas collectors, blowers and flare system. As part of Work Order No. 6, SWDD authorized Geosyntec to design a GCCS expansion/phasing plan for the Class I landfill facility, which included upgrading the system to account for the future waste placement that will occur in the existing Segment 1, Segment 2, and Infill Area. Implementation of this upgraded GCCS system will also increase the economic viability of the landfill gas utilization project that SWDD and the County are currently pursuing. PROPOSED SCOPE OF WORK This project includes professional engineering services that will be performed for the design modification, permitting, and construction of the Class I landfill vertical expansion, including expansion of GCCS in Segment 1, Segment 2 and Infill Area. The scope of work is based on the requirements of Chapter 62-701, Florida Administrative Code (FAC) and Geosyntec's understanding of the project based on information provided by the SWDD. In addition, Geosyntec will also provide engineering support services for the construction and operation of an on-site borrow pit to supply fill material for construction of the vertical expansion and as cover material for the Class I landfill operations. XL07232/JL80057 IRC PROPOSAL.doc engineers 1 scientists I innovators