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INDIAN RIVER COUNTY <br />SOLID WASTE DISPOSAL DISTRICT <br />BOARD MEMORANDUM <br />1541 <br />Date: February 8, 2019 <br />To: Jason E. Brown, County Administrator <br />From: Vincent Burke, P.E., Director of Utility Services <br />Prepared By: Himanshu H. Mehta, P.E., Managing Director, Solid Waste Disposal District <br />Subject: CCNA-2018 Work Order No. 4 to Geosyntec Consultants for Professional Services with <br />a Focused Feasibility Evaluation of Landfill Liquids Management Options <br />DESCRIPTIONS AND CONDITIONS: <br />The Indian River County (IRC) Solid Waste Disposal District (SWDD) operates a Class 1 Landfill that is <br />designed and permitted to capture leachate (liquid that passes through the waste) from the landfill. The <br />IRC Department of Utility Services (IRCDUS) operates a Residuals Dewatering Facility (RDF) on the landfill <br />property. Currently, the leachate is combined with the centrate (liquid portion of the dewatering process) <br />and is transmitted via a force main approximately five miles away to the West Regional Waste Water <br />Treatment Facility (WRWWTF). The WRWWTF sends treated effluent to various users (golf courses) and <br />is permitted to discharge treated effluent into the Lateral D Canal via the on-site created wetlands. <br />However, the nutrient loading from the leachate and centrate are impacting the stringent permit <br />conditions at the WRWWTF. <br />As a result, SWDD and IRCDUS want to explore other treatment and disposal options for the combined <br />leachate and centrate liquids from the landfill facility. Aside from discharging the liquids to an off-site publicly - <br />owned treatment works (POTW) such as the WRWWTF, the other commonly used leachate management <br />approaches at municipal solid waste (MSW) (i.e., Class I) landfills are: (i) on-site leachate recirculation back <br />into the landfill; (ii) volume reduction using evaporation technology; (iii) discharge into an on-site <br />underground injection control (UIC) well; (iv) off-site trucking to an UIC well; and (v) on-site treatment using <br />a variety of physical, chemical, and/or biological approaches ranging from reverse osmosis (RO) to sequencing <br />batch reactors (SBRs), aerated lagoons, "Vetiver grass" and constructed wetlands. On-site treatment may be <br />performed to meet industrial pretreatment standards for eventual discharge to a POTW, or it may be utilized <br />as a stand-alone treatment system for subsequent discharge via a National Pollutant Discharge Elimination <br />System (NPDES) permit or an UIC permit, on-site reuse, or land application. On January 22, 2019, the SWDD <br />Board provided staff direction on not pursuing the use of a UIC well for the disposal of the liquids from the <br />landfill facility. The purpose of this agenda is to seek authorization to explore other viable treatment / disposal <br />methods. <br />ANALYSIS: <br />As part of the Continuing Contract Agreement for Continuing Engineering Services, entered into on <br />ApriI17, 2018, SWDD staff requested Geosyntec to submit a proposal to provide professional and <br />@BCL@580EAB18.docx <br />79 <br />Page 1 of 3 <br />