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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 I Landfill and use the results to design the X90232_11W LF Permitting.doc engineers I scientists i innovators