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Work Or Number 42 CENTRATE YANK CONVERSION EXHIBITA SCOPE C. WORK PROJECTUNDERSTANDINC Indian River County (County) solid waste disposal district (SWDD) is in the process of' evaluating treatment options for leachate collected from the Class I municipal solid waste landfill, in an effort. to cease disposal to the C,(.wnty's West Regional wastewater treatment facility (WWTF'). A potential treatment prqject will not likelybegin implementation for several months,, In the meantime, gas production from the landfill gas collection wells is being severely hampered by infiltration of leachate intro the wells. The County installed pumps to remove the leachate from these gas wells, but the resulting concentrated leachate is causing treatment and disposal issues at the WWTF. The County also operates a biosoNds dewatering facility located on the SWDD landfill property,,"The biosolids facility design originally included a 0., -million -gallon. ground storage tank (GST) for storage of dewatering centrate prior to pumping of site. "rhe GST, however, has not been utilized for centrate storage for the past several years. SWDD is considering converting the unused GS'I'to store the concentrated leachate until such time as the treatment project is in scm,ice. Repurposing the tank would require recoating of" the; interior with a material suitable for leachate storage, installation of a mixer to prevent stagnation/so lids settling, a potential modification to the vent on the tank for off -gassing and piping modifications to get the leachate (and potentially reclaimed water for dilution) into/(.,)ut of the GIST. Kimley-Horn ("Consultant") will prepare a recommendation for installation of a mixer, specify the tank and piping modifications needed to repurpose the existing GST,'prepare the necessary utility permit and provide services during construction as outlined in the following Scope of Services. SCOPE (WSERVICES Task 1: Mixing Evaluation (Lump SUDI) Consultant Will conduct an evaluation of the mixing options ftwr the existing GIS"I''. The Consultant will rely on the most recent water quality data for, the concentrated leachate to determine the best mixing option(s) fir preventing adverse: settling or stagnation of the leachate wfiile being stored over a period of several months.. 'I"he evaluation will consist of areview of a floating mixer, a tank -bottom mixer and jet pump mixers in the GST walls to determine which option(s) provide acceptable rnixing patterns. Once the fi.-,asible options Mage I of 7