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Mr. Himanshu H. Mehta, P.E. 4 December 2020 Page 7 Phase 3 — Quarterly Assessment Monitoring and Reporting Both C&D Debris Disposal Facility and Class I Landfill) Geosyntec will perform quarterly sampling events for Calendar Year 2021 (January, April, July, and October) of eight (8) groundwater wells (MW -21S, MW -33S, MW -35S, MW -40S, MW - 49S, MW -50S, MW -51S, and MW -52S) and seven (7) surface water sample sites (SW-LC1, SW-LC2, SW-LC3, LC-SW4, LC-SW5, LC-SW6, and LC-SW8) for the C&D debris disposal facility and at four (4) groundwater monitoring wells (MW -14S, MW -53S, MW -54S, and MW - 54I) and two (2) surface water samples (C5-SW1 and C5-SW3) for the Class I landfill. Please note, Geosyntec has assumed that FDEP will not add the three (3) newly installed piezometers to the C&D debris disposal facility quarterly monitoring. The January and July sampling will be performed as part of the semi-annual sampling program under Phase 2 for the C&D debris disposal facility and assumed to take two (2) days to complete. The April and October data collection and sampling will each take four (4) days to complete. Geosyntec will deliver the samples to ENCO laboratory for analytical testing under SWDD's contract (i.e., ENCO.will directly invoice SWDD for laboratory charges). For the C&D debris disposal facility, the quarterly assessment monitoring samples (including those collected in January and July) will be analyzed for the routine monitoring parameters listed in Paragraph 8 of the WQMP (C&D Permit) plus arsenic and benzene. In addition, monitoring wells MW -21S and MW -49S will be analyzed for 1 -methylnaphthalene, 2- methylnaphthalene, anthracite, fluorene, and acenaphthene. These additional parameters were requested by FDEP as part of the approval to convert these wells and surface water sites from evaluation monitoring to quarterly assessment monitoring. For the Class I landfill, the quarterly assessment groundwater monitoring samples will be sampled for parameters as required by subparagraph 62-701.510(6)(a)3, F.A.C. The surface water sampling locations for the Class I landfill will be analyzed for the parameters as required by paragraph 62-701.510(5)(b), F.A.C.As a reminder, this list of parameters was approved by FDEP as part of Geosyntec's 20 October 2020 Work Plan. Geosyntec will assist SWDD in coordinating the analytical testing activities with ENCO, notify FDEP prior to sampling as required by the WQMP, review and evaluate the analytical test results, and prepare a letter report for each quarterly assessment monitoring event. The letter reports will be submitted in draft forms to SWDD for review and comment and will be finalized, with SWDD's comments implemented, for submittal to FDEP. Any changes to the monitoring and reporting requirements that might be requested by FDEP based on the results of the quarterly assessment monitoring will be performed under Phase 5 below. NCP2020_3249/JL20060_2021 Compliance Monitoring Proposal