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15133 SWDD Item Indian River County, Florida Solid Waste Disposal District Board Memorandum Date: April 28, 2022 To: Jason E. Brown, County Administrator From: Sean C. Lieske, Director of Utility Services Prepared By: Himanshu H. Mehta, PE, Managing Director, Solid Waste Disposal District Subject: Change Order No. 1 to Agreement with Biogas Engineering for a High Pressure Skid System Descriptions and Conditions: On April 5, 2022, the Solid Waste Disposal District (SWDD) approved the agreement with Biogas Engineering to fabricate the High -Pressure Skid (HPS) system for a not -to -exceed cost of $789,000. The objective of the HPS system is to send pressurized landfill gas (LFG) to both the Leachate Evaporation system, which will be constructed approximately % mile from the new HPS, and the Renewable Natural Gas (RNG) project by Nopetro Eco District, LLC (NED) that will be located approximately %: mile away on the neighboring Indian River EcoDistrict property. The original design plan was to send "wet" gas to the respective systems and use a series of gravity sumps to collect the moisture in the gas called condensate. A separate pneumatic air -line would be needed to pump the condensate into a separate liquid line back to one of the on-site lift stations. Although this conceptually worked, the 30% design was indicating that these gravity sumps and the corresponding lines would need to be constructed at a depth of 9 to 12 feet (ft.) below surface. Given the high water table of 3 to 6 ft. below surface, the construction cost of this segment of the project would be very expensive. After further discussion with BGE, a change in design to utilize a chiller to "dry" the gas would eliminate the gravity sump system along with the extra liquid and air -lines. Since the installation of the chiller would provide an equal benefit to the Evaporation project and the RNG project, staff was able to receive the attached letter of support from NED to reimburse SWDD 50% of the engineering, purchase and fabrication cost of the chiller upon construction commencement of their project. Staff requested the attached Change Order No. 1 from BGE to facilitate this change in direction. Analysis: BGE has provided Change Order No. 1 to provide equipment to dehydrate the LFG prior to it being sent into the pipeline. This change -order covers the cost of providing the necessary equipment to achieve this request, including the cost to engineer, size, and integrate this equipment into the HPS system. The design SWDD Agenda - Change Order No. 1 to Agreement with Biogas Engineering for a High Pressure Skid Page 1 141 System