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Mr. Himanshu H. Mehta, P.E. 20 December 2023 Page 2 The Class I landfill currently accepts both Class I waste and C&D debris for disposal under the Florida Department of Environmental Protection (FDEP) Construct and Operate Permit Modification Nos. 0128769 -026 -SC -IM and 0128769 -033 -SO -MM, dated November 30, 2022 (Class I Permit). The C&D debris disposal facility operates under FDEP Permit No. 0128769- 032 -SO -24, dated June 1, 2022 (C&D Permit). Semi -Annual Water Ouality Comaliance Monitoring and Reporting The Water Quality Monitoring Plan (WQMP) for each of the IRCL facilities permits (which is listed as Appendix 3 of each permit) indicates that groundwater and surface water quality monitoring are required. Semi-annual sampling of the Class I landfill and C&D debris disposal facility groundwater monitoring wells shall be conducted in January and July 2024. The samples collected from the Class I landfill and C&D debris disposal facility monitoring wells shall be analyzed for the routine monitoring parameters listed in Section I1.3 (Class I Permit) and Paragraph 8 (C&D Permit) of the WQMP, respectively, as required by paragraphs 62- 701.510(5)(c) & (7)(a) and 62-701.730(8)(d), Florida Administrative Code (F.A.C.). Samples from one surface water monitoring site (SW -2) shall be collected semi-annually in January and July, if water is discharging from the stormwater pond. The samples, if collected, shall be analyzed for the list of parameters listed in Section II1.2 of the Class I Landfill WQMP, as required by paragraphs 62-701.510 (5)(d) and (7)(b), F.A.C. Geosyntec will perform the field sampling activities, and the analytical testing will be conducted by Eurofins Scientific Laboratory (Eurofins), the analytical laboratory contracted with, and direct bill to, SWDD. The results of the semi-annual water -quality monitoring events are to be reported to the FDEP within 60 days of receipt of analysis from the laboratory. Ouarterly Assessment Monitoring for the C&D Debris Disposal Facility Geosyntec understands that results of routine sampling of C&D debris disposal facility groundwater monitoring well (MW -21 S) in January 2017 indicated exceedances of benzene and sodium groundwater cleanup target levels (GCTLs). As a result, the SWDD was requested by the FDEP to initiate evaluation monitoring in accordance with subsection 62-701.510(6), F.A.C. Pursuant to this request the SWDD installed one groundwater monitoring well (MW -49S) in July 2017. These and other wells (MW -21S, MW -33S, MW -35S, MW -40S, MW -49S, MW -50S, MW -51S, and MW -52S) and seven surface water (SW) Lateral Canal (LC) sample sites (SW - LCI, SW-LC2, SW-LC3, LC-SW4, LC-SW5, LC-SW6, and LC-SW8) have been sampled quarterly from July 2017 to October 2020 under an evaluation monitoring program with the FDEP. However, in correspondence dated 14 October 2019 from the FDEP to the SWDD, the FDEP approved the SWDD's request to replace the evaluation monitoring of the eight NCP2323548/JL23073 2024 Compliance Monitoring Proposal engineers I scientists I innovators