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Mr. Himanshu Mehta 14 December 2009 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 administers the operation and is the pen -nit holder of the Class I Landfill at the IRCL facility. The Class I landfill includes Segment 1, Segment 2, and an Infill Area located between Segment I and Segment 2. Segment 1 occupies approximately 20 acres, is unlined, and was initially closed in 1990 at elevation of approximately 110 ft National Geodetic Vertical Datum (NGVD), with a cover system consisting of 8- to 12 -in. thick compacted clay cap. Segment 2 has a footprint of approximately 38 acres, was originally permitted to elevation 145 ft NGVD, and 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 slope of the closed Segment 1. The latest five-year operating permit was issued to SWDD by FDEP on 19 May 2005 under Permit No. S031-0128769-01 1; this operating permit is scheduled to expire on 18 May 2010. During the five-year period, FDEP has issued many modifications to the solid waste operating permitting, including the vertical expansion over the top slopes of the previously closed Segment 1 landfill and for the partial closure of the north and south slopes of Segment 2 and the Infill Area to elevation 105 ft NGVD. The latest permit number for the facility is 5031-0128769-018. The SWDD completed the construction of the vertical expansion and partial closure of the Class I landfill in October 2009. Geosyntec has prepared and submitted to FDEP, for review and approval, a certification report for the completion of the construction of the vertical expansion component of the project. Following a field inspection by FDEP representatives, the lined area of the vertical expansion was approved for disposal of solid waste by FDEP on 24 November 2009. The certification report for the partial closure was submitted to FDEP on 8 December 2009. The construction of the vertical expansion and the partial closure of the side slopes of Segment 2 and the Infill Area of the Class 1 Landfill have increased the impervious area of the landfill cell and consequently the volume of storm water runoff. The results from preliminary modeling of storm water runoff flow, expected from a 25 -year, 24-hour storm event, suggest that the perimeter Swale of the storm water management system is undersized, primarily within the northwestern section of the landfill site, and therefore, may be inadequate to handle the entire flow of a large storm event. The scope of work described in this proposal will model the generation of storm water runoff from the Class 1 Landfill and use the results to design the X90232_I1W LF Permitting.doc engineers I scientists I innovators