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Mr. Himanshu Mehta 11 July 2008 Page 2 PROJECT BACKGROUND The IRCL facility is located in southern Indian River County, east of Interstate 95, south of Oslo Road, and west of Rangeline Road in Vero Beach, Florida. The SWDD operates both the Class I landfill and Construction and Demolition (C&D) disposal facility at the IRCL facility. The Class I landfill includes Segment 1, Segment 2, and an Infill Area located between Segment 1 and Segment 2. Segment 1 is approximately 20 acres, unlined, and was initially closed in 1990 with a cover system that included & to 124n. thick compacted clay cap. Segment 2, which is approximately 38 acres in total footprint, has a 60 -mil thick high-density polyethylene (HDPE) geomembrane single liner. The Infill Area has: (i) a single composite liner comprised of a 60 - mil thick HDPE geomembrane placed on top of 2 -ft thick compacted clay liner over a 5 -acre area between Segment 1 and Segment 2, and (ii) a 60 -mil thick textured HDPE geomembrane single liner over the 7.5 acres of the eastern side slopes of the closed Segment 1 landfill. Segment 2 sideslopes were capped in 1998 with a 40 -mil LDPE geomembrane and 2 -ft of cover soil to El. 55 ft NGVD. The Infill sideslopes currently are not capped. Leachate from the lined Segment 1 eastern side slopes, Segment 2, and Infill Area is collected through a combination of leachate collection system (LCS) drainage media and HDPE pipes, and conveyed to a pump station located at the northwest corner of Segment 2. The leachate is then transferred through a force main to the West Regional Wastewater Treatment Plant for treatment and disposal. In June 2005, the Florida Department of Environmental Protection (FDEP) issued the SWDD with an expansion permit, under Permit Modification No. SO31-0128769-011, for the disposal of C&D debris over the south and west slopes of the closed Segment 1 landfill using 3 horizontal to 1 vertical (3H:1 V) side slope geometry. The westward top slopes of the C&D expansion would extend to elevation (El.) 129.5 ft National Geodetic Vertical Datum (NGVD) and grade to the east at a 5 percent slope. The Segment 2 and Infill Area were also permitted to have 3H:1 V waste slopes from El. 55 to El. 145 ft NGVD. In August 2006, FDEP issued the SWDD with an expansion permit for placement of C&D debris over the north slope of the closed Segment 1 landfill using 3H:1 V side slope geometry, extending the elevation to approximately 125 ft NGVD, under Permit Modification No. 5031-0128769-013. The C&D debris placement over the slopes of the previously -closed Segment 1 landfill, under the current FDEP Permits, is presently projected to reach final grades by March 2009. In order to improve aesthetics at the IRCL facility, the SWDD has voluntarily elected to place cover soil and sod over portions of the C&D debris that have reached final grades in a "close -as - you -go" manner. In April 2007, the SWDD authorized Geosyntec under Work Order No. 6 to FUTITNTOWETITMe F,,. engineers I scientists I innovators