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SWDD Item Indian River County, Florida Solid Waste Disposal District Board Memorandum Date: June 7, 2021 To: Jason E. Brown, County Administrator From: Vincent Burke, PE, Director of Utility Services Prepared By: Himanshu H. Mehta, PE, Managing Director, Solid Waste Disposal District (SWDD) Subject: Change Order N0.1 to SCS Field Services for Landfill Segment 3 Cell 1 Landfill Gas System Expansion Project (Bid #2021006) Descriptions and Conditions: On February 9, 2021, the Indian River County (IRC) Solid Waste Disposal District (SWDD) awarded Bid #2021006 for the construction of the Landfill Segment 3 Cell 1 Landfill Gas System Expansion to Sterns, Conrad, and Schmidt Consulting Engineers, Inc. dba SCS Field Services. The grand total bid award for the project was for $1,068,510.00, which included $96,810.00 in bid contingency and bid alternative. SWDD utilized CDM Smith to provide the initial Phase 1 design, permitting, and bidding assistance for this project in accordance with the approved Work Order No. 2 dated May 19, 2020, in the amount of $199,810. The Phase 2 construction services was also authorized by the SWDD Board on February 9, 2021, to CDM Smith as Amendment No. 1 to Work Order No. 2 in the amount of $139,190, for total engineering costs of $339,000. Staff requested additional items through CDM Smith to optimize the capture of gas. Staff requested the consideration for the installation of four additional landfill gas wells and extension of the side slope collectors in the form of horizontal wells. Also, in order to address perched leachate issues in Cell 2, SCS Field Services was requested to perform video and jet cleaning of the existing collection system. Finally, the upsizing of the existing condensate piping was requested in order to accommodate higher leachate pumping in Cell 1. CDM Smith has reviewed, approved, and recommended the attached Change Order No. 1 to SCS Field Services (Attachment 1). Analysis: Given the recent approval of the 2nd Amendment to the Landfill Gas Agreement to the Indian River Eco District, LLC, which requires a target of 1,150 standard cubic feet per minute (scfm) of landfill gas and the fact that we are currently at an average of 500 scfm, staff requested additional vertical and horizontal gas well screens to increase the total output production of our landfill. Also, with the leachate continuing to be a challenge in hindering gas production, steps are recommended to remove the leachate from the landfill as efficiently as possible. 233 SWDD Agenda - Change Order No. 1 for Segment 3 Cell 1 Landfill Gas Expansion Project (Bid No. 2021006) Page 1 of 2