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Mr. Himanshu H. Mehta, P.E. 14 December 2021 Page 3 correspondence dated 14 October 2019 from FDEP to SWDD, the FDEP approved SWDD's request to replace the evaluation monitoring of the eight groundwater wells and surface water sample sites with quarterly assessment monitoring and with the addition of other parameters (arsenic, benzene, naphthalene, and other semi -volatile organic compounds [VOCs]) to the suite of parameters to be analyzed for at these wells. The FDEP also requested sampling of additional surface water sites in the Lateral C Canal for the purpose of establishing background water - quality conditions. Therefore, in 2020 Geosyntec working on behalf of SWDD sampled all seven surface water sites except for April 2020 where the FDEP agreed to a reduction to three locations. The reduction to three surface water sampling locations was a one sampling events approval and the total number of surface water sampling locations is assumed to be seven for the 2021 sampling events. In 2021, Geosyntec working on behalf of SWDD eliminated six surface water sampling locations (SW-LC2, LC-SW5, LC-SW7, LC-SW8, LC-SW9 and LC -SW 10) and discontinued the sampling of MW -33S and MW -35S. Additionally, Geosyntec working on behalf of SWDD in 2021 reduced the collection frequency of arsenic, benzene, naphthalene, 1 - methylnaphthalene, 2 -methylnaphthalene, acenaphthene, and anthracene at MW -21S and MW - 49S from quarterly to semi-annual. Geosyntec will continue working with FDEP to further reduced the surface and groundwater quarterly sampling scope at the C&D debris disposal facility in 2022 in order to provide overall cost savings to the County. Therefore, in addition to the semi-annual sampling of the C&D debris disposal facility monitoring wells in January and July 2022, six wells and four surface water sample sites will also be sampled in April and October 2022 as part of the 2022 compliance monitoring and reporting program. Geosyntec recently (in November 202 1) conducted supplemental groundwater assessment in the vicinity of C&D debris disposal facility. This program might be amended based on the results of the supplemental assessment. Ouarterly Assessment Monitorinp- for the Class I Landfill A comment letter from FDEP dated 6 May 2020 provided comments regarding the results of the January 2020 Semi -Annual Water Quality Monitoring Report for the Class f landfill. FDEP provided notification to SWDD to initiate evaluation monitoring at all monitoring wells with detected exceedances above applicable groundwater cleanup target levels (GCTLs) for pH, ammonia, chloride, sodium, total dissolved solids (TDS) and arsenic. Geosyntec provided a response to comments (RTC) letter to the FDEP comment letter on 28 May 2020 which focused on the long-term trends with the dataset available from the FDEP Water Assurance Compliance System (WACS) database and requested a reduction of evaluation monitoring locations from 25 locations (as originally requested by the FDEP in the 8 May 2020 letter) to four (4) locations (specifically downgradient of MW -3S, MW -14S, MW -44S and MW -441). FDEP approved this request in a letter dated 14 August 2020 and the 90 -day evaluation monitoring period was NCP2021-344I/JL21090 2022 Compliance Monitoring Proposal.Final.doc