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Last modified
8/8/2022 11:06:37 AM
Creation date
8/8/2022 11:06:36 AM
Metadata
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Template:
Official Documents
Official Document Type
Amendment
Approved Date
07/12/2022
Control Number
2022-141
Agenda Item Number
15.B.7.
Entity Name
Kimley-Horn and Associates, Inc.
Subject
Amendment No.1 to CCNA2018 Work Order 42 for
Centrate to Leachate Tank Conversion
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mixer to prevent stagnation and solids settling. During the process of designing the <br /> modifications,the Florida Department of Environmental Protection made a determination <br /> that the original tank design would not meet the requirements for secondary containment <br /> for leachate storage. <br /> Chapter 62-701.400 of the Florida Administrative Code requires above ground storage <br /> tanks to include secondary containment in one of several approved forms. The existing <br /> GST does not meet those requirements, and therefore requires an Alternate Procedure <br /> Approval from FDEP. The Alternate Procedure process is detailed below under Task 4: <br /> Permitting;however,the additional services related to the evaluation of the options to meet <br /> the rule are as follows: <br /> 1. Contacted various tank vendors to determine feasibility of and budget level cost <br /> estimates for the construction of a tank within a tank or new,secondary containment <br /> wall outside of existing GST. <br /> 2. Contacted vendor regarding the pricing for a new, double-walled metal tank. <br /> 3. Contacted various vendors regarding the options for installation of a liner within <br /> the existing GST (determined not to be compatible with the pre-stressed concrete <br /> tank or the mixer system that had been selected). <br /> 4. Coordination with existing tank manufacturer for structural options and <br /> construction methods that may partially meet the FDEP Rule. <br /> Amendment No. 1 provides for additional services related to evaluating the secondary <br /> containment options for continued use of the GST. <br /> Task 3: Piping Modifications (Lump Sum) <br /> The piping system into the tank was originally anticipated to be designed to deliver both <br /> the typical leachate and concentrated leachate to the tank in a single pipeline.As the design <br /> progressed, SWDD staff requested several iterations of the design to allow for various <br /> operating scenarios. <br /> An additional modification/redesign was required when SWDD requested that the <br /> alignment of the piping be revised to avoid the ongoing FPL project to underground the <br /> overhead electric lines in the center of the site. <br /> Amendment No. 1 provides for three additional pipeline design iterations and additional <br /> valve and flow meter details related to splitting of the flows for operational flexibility. <br /> Task 4: Permitting(Lump Sum) <br /> As noted above, FDEP determined that the use of the GST for leachate storage would <br /> require a variance, modifications to the design to provide for secondary containment, or a <br /> request for approval of an Alternate Procedure. The Consultant evaluated these options, <br /> as follows: <br /> 1. VarianceâSWDD determined that a Rule variance was not the preferred long- <br /> term option, as the intent of the Rule is to protect the environment from the <br /> Page 2 of 6 <br />
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