Agenda - 05-18-2010 - 4f - Laserfiche WebLink

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aGeneral Engineering and Environmental Management Services LANDFILL SITE SELECTION HDR was selected by the County to continue serving its needs in selecting and developing a new landfill. In the spring of 1997, the County Council appointed an ad -hoc committee to select a site for the future landfill. The committee started the selection process by reviewing all of the sites identified by the Cooperative. In June of 1998, County Council voted to obtain title to the site then known as Site M; subsequently, it was called Southern Greenville County Landfill (SGCL), and today is known as the Twin Chimneys. Landfill. The four parcels comprising the 1,156 acre Site M were subsequently purchased in 1999. Over a period of two and a half years, HDR supervised the drilling and evaluation of 103 soil borings and the installation of 83 piezometers at the new site. HDR conducted wetland identifications on the site and reviewed the site for threatened and endangered species. On December 12, 2001, the Site Hydrogeologic Characterization Report prepared by HDR was approved by the South Carolina. Department of Health and Environmental Control (SCDHEC). HDR prepared the permit application for a MSW landfill facility covering a total of 389 acres in seven distinct units. The design included areas for management o f yard wastes, tires, white goods, recyclables, leachate, and landfill gas, as well as locations for a citizen's convenience center, scales, administrative offices, an education center, and maintenance building. In February 2002, HDR submitted the permit application for the site. On November 20, 2003, the County received MSW landfill permit #231001 -1102 for development of the Southern Greenville County Landfill. ENOREE LANDFILL PetmilapplfCetlen SwW!mke6ae1¢ As planning was ongoing related to the new long -term landfill, the County was also dealing with disposal issues at the Enoree Landfill ( Enoree). Phase I of Enoree was constructed and operated until it was closed and capped in 1994 following the adoption of the Subtitle D landfill regulations requiring landfills to have liners. Landfilling operations ceased at Enoree until July 1995 so that a lined landfill cell (Phase II Cell 1) could be permitted and constructed at the site. In April 1995, the County issued an RFP for design and construction administration at the Enoree Landfill. HDR was selected to provide plans and specifications for Cells 2 and 3. HDR analyzed the permit plans and geotechnical data submitted in the original permit application and offered the opinion that further geotechnical investigation may allow the County to lower the base grades, thereby increasing the available airspace and providing additional soils for operations. Field investigations performed in June 1996 substantiated this opinion and a permit modification was subsequently applied for and approved by SCDHEC. In June 1998, HDR submitted a proposal to the County to provide plans, specifications, bidding assistance, and construction monitoring for Cells 4, 5, and 6 and the closure of Enoree Phase Il. HDR, on behalf of the County, applied for another permit modification to simplify the design (and help reduce construction costs) for the remaining cells. In 2001, HDR completed development of the construction plans and specifications for Cell 6. Interestingly, estimates originally made in 1990 predicted the expected life of the Enoree Landfill at 13 years. Enoree closed in 2007 after 16 years of operation. While Enoree was operating, HDR assisted the County on regulatory issues and miscellaneous engineering projects such as a landfill gas master plan, Title V permit, and mulching permits. Page 22 l