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Environmental Consultants 1900 Northwest Corporate Blvd. 954-571-9200 <br /> and Contractors Suite W110 FAX 954-418-9800 <br /> Boca Raton, FL 33431 www.scsengineers.com <br /> SCS FIELD SERVICES <br /> August 23, 2017 <br /> Project No. 07214007.01 <br /> Brian Lewis <br /> Landfill Operations Manager <br /> Republic Services <br /> 1327 74th Ave SE <br /> Vero Beach, FL 32968 <br /> Subject: Proposal to Install Horizontal Landfill Gas Collectors and Abandon Existing <br /> Collectors in the Active Cell <br /> Indian River Landfill,Vero Beach, Florida <br /> Dear Mr. Lewis, <br /> SCS Field Services(SCS)is pleased to provide this proposal to you for the subject work. SCS-FS is <br /> prepared to order materials immediately upon receipt of approval. The budgetary estimate is outlined <br /> below. All work will be performed and invoiced in accordance with our current purchase order <br /> BPO05609391. <br /> BACKGROUND <br /> There are currently six horizontal and five vertical landfill gas(LFG) collectors located in the active <br /> cell. Each of these LFG collection points are paired with a vacuum riser pipe. These collectors were <br /> installed prior to waste being deposited in the active cell and are no longer effective LFG extraction <br /> points due to liquid blocking the perforated sections of piping or crushing of well casings during <br /> filling operations. The quantity and density of vertical piping from these collection points and <br /> vacuum risers makes filling in these areas cumbersome and creates a potential for damage to the <br /> GCCS. It is also not cost effective to continue raising these vertical pipes with each lift of waste <br /> since they are no longer adequate LFG collectors and have no influence on collecting LFG from new <br /> waste currently being placed. <br /> SCS recommends abandoning the eleven collection points and corresponding vacuum risers and <br /> replacing them with two new horizontal collectors which will run across the cell from North to <br /> South. The new horizontal gas collectors will serve as replacement coverage for the wells which are <br /> proposed for abandonment. Additional benefits will be a significant reduction in vertical pipe <br /> penetrations along the landfill surface and LFG recovery from the new waste which has been <br /> deposited since filling operations started in the new cell. <br /> DESCRIPTION OF SERVICES <br /> Task One: Installation of Horizontal Collectors <br /> SCS will provide the labor, equipment, and materials to install two new horizontal collectors and <br /> vacuum lateral piping along the western edge of the new cell (HC-1701N/HC-1701S). Each <br /> horizontal collector will consist of approximately 350 feet of 6-inch HDPE SDR 11 perforated piping <br /> and 75 feet of 6-inch HDPE SDR 11 solid piping based on distance from edge of waste to the center <br /> of the cell(approx. located on what is currently HP-12). The trench will be bedded with approx. one <br /> foot of 4-inch tire chips above and below sections of perforated pipe. Minimum trench depth will be <br /> 0 <br />