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TWIN CHININEYS LANDFILL General Engineering and Environmental Management Services 38 Near the end of 2003, HDR worked with the County to continue development of the SGCLF site. The construction was planned out in an orderly sequence, and a master schedule was developed to identify the interrelationships of tasks. HDR prepared clearing and grubbing specifications and plans, and assisted the County with bidding and selection of the contractor. HDR prepared plans and specifications for grading the site, the first cell, and an initial complement of buildings. HDR also prepared a proforma to aid the County in understanding the changes in cost of services as waste disposal transitioned from Enoree to SGCLF. In 2004, the County issued another RFP for solid waste related engineering services. HDR was the firm selected to continue the work. The goal was to be ready to accept waste at the Twin Chimneys Landfill by January 1, 2006. In October of 2004 the initial clearing of the site was complete and the grading contract was begun to prepare the site for construction. Construction on Cell 1 began in April of 2005. At the same time, designs for the buildings were being finalized, and construction began on them in July 2005. With the infrastructure and lined landfill cell under construction, HDR began work on _ modifying the permit to provide C &D capacity at the site. Cell 1 was : completed on schedule and ready for waste by January 1, 2006; however, additional space remained at the Enoree Landfill so transition to the new site was put on hold. In May of 2006, SCDHEC approved the permit modification, allowing a C &D landfill as Unit 2 of the facility, and construction began on the first cell for that landfill unit. The Twin Chimneys for which the site is named were revealed near the facility entrance during construction of the first cell. From the beginning, the County and its contractors have worked to preserve those chimneys as monuments. On January 15, 2007, the C &D unit at Twin Chimneys Landfill began accepting waste. On February 12, 2007, the MSW unit began accepting waste and the Enoree Landfill was closed. Since the first cell of Unit 1 was only sized to initiate landfill operations, construction of Cell 2 was begun in March of 2007. On May 23, 2008, newly promulgated solid waste rules for the state became effective, requiring the addition of groundwater monitoring for C &D (now called Class II) units. The new rules also included revising the Special Waste Analysis and Implementation Plan (SWAIP) requirements. HDR submitted approval for groundwater monitoring of the C &D unit in August 2008, and the first wells have been installed and are currently undergoing background sampling. According to state regulators, the SWAIP submitted by HDR on behalf of Greenville County for the Twin Chimneys Landfill was the first in the state to be approved. Waste has been placed in both Cells 1 and 2 of the MSW (Class III) unit, and HDR has prepared plans and specifications for Cells 3 and 4. It is expected that those cells will be under construction beginning in May 2009. HDR looks forward to providing engineering services to Greenville County in the future. Page 23 1 a q