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(GCL) with a hydraulic conductivity of 10-7 cm/sec or less will be specified below the secondary geomembrane liner. Calculations will be performed to specify a geocomposite capable of handling the flow and load conditions. A primary leachate collection and removal system above the primary geomembrane is designed to limit the leachate head less than 12-inches above the liner as required by Chapter 62-701, F.A.C.A leak detection system will be designed between the primary and secondary liners.The leachate collection system piping was previously sized and permitted. CONSULTANT will confirm these calculations.The leachate collection and conveyance systems will be designed to handle additional loads due to increase in density of the waste (i.e. achieve the 0.3 percent minimum post- settlement slope requirement of Chapter 62-701.400, F.A.C.). The SWDD has requested that Cell 2 gravity drain to a manhole,which is a modification of the permitted sump pump design. In addition, SWDD has requested that a new lift station and force main be designed to handle the flows from existing Segment 3 Cell 1 and future Cells 2-4.CONSULTANT will recommend the location for the new lift station and perform the required calculations to confirm the size of the lift station and force main. In addition,CONSULTANT will design the electrical connections and control panels for the lift station. In addition,per SWDD's request to divert stormwater flow,CONSULTANT will design a headwall to be installed behind the existing Segment 1 &2 lift station (located at NW corner of Segment 2). Details for the headwall will be included in the drawings in Subtask 2.8. Subtask 3.2 Closure Subbase Grading- CONSULTANT will utilize the latest topographic survey information obtained in Phase Ito prepare the grading plan.CONSULTANT will evaluate overfills and underfills using an AutoCAD Civil 3D model and prepare grade differentials comparing the topographic survey to the permitted final closure grades.The subbase grading will help determine the tie-in of the new partial closure grading to the existing closed grades. CONSULTANT will notify SWDD if any design considerations need to be made for the over/underfills. Subtask 3.3 Stormwater Management System Design-CONSULTANT will review the permitted stormwater management system including overall swale sizing,letdown pipe locations and sizes,terrace swales,structures at terrace details,flashboard risers,and control structures and incorporate into the design drawings.Work includes verification of the design ICPR model to confirm parameters and results. Subtask 3.4 Final Cover System Design-CONSULTANT will design the final cover system in accordance with 62-701.600, F.A.C.The available geomembrane materials and geocomposites will be evaluated to prepare the design of the final cover system. The design will include the required details for geomembrane boots for gas wells, cleanouts,sideslope risers,and other penetrating components,geomembrane edge markers,and tie-ins to the existing bottom liner system and existing cap liner system.The permit set details will be utilized and additional details will be added as necessary.