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Environmental Consultants <br />and Contractors <br />1900 Northwest Corporate Blvd. <br />Suite W110 <br />Boca Raton, FL 33431 <br />954-571-9200 <br />FAX 954-418-9800 <br />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 />