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2017-129
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Last modified
9/13/2017 11:10:24 AM
Creation date
9/13/2017 11:07:07 AM
Metadata
Fields
Template:
Official Documents
Official Document Type
Amendment
Approved Date
09/12/2017
Control Number
2017-129
Agenda Item Number
15.B.1.
Entity Name
Republic Services
Subject
Tenth Amendment to Contract Agreement with SWDD
Operations and Maintenance
SWDD Landfill and Customer Convenience Centers
SCS Field Services
Horizontal Landfill Gas Collectors
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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 />
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