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Mr. Himanshu H. Mehta, P.E. <br />20 December 2023 <br />Page 3 <br />groundwater wells and surface water sample sites with quarterly assessment monitoring and with <br />the addition of other parameters (arsenic, benzene, naphthalene, and other semi -volatile organic <br />compounds [VOCs]) to the suite of parameters to be analyzed for at these wells. The FDEP also <br />requested sampling of additional surface water sites in the Lateral C Canal for the purpose of <br />establishing background water -quality conditions. Therefore, in 2020 Geosyntec working on <br />behalf of the SWDD sampled all seven surface water sites except for April 2020 where the FDEP <br />agreed to a reduction to three locations. The reduction to three surface water sampling locations <br />was approved for sampling events and the total number of surface water sampling locations is <br />assumed to be seven for the 2024 sampling events. In 2021, Geosyntec working on behalf of the <br />SWDD eliminated six surface water sampling locations (SW-LC2, LC-SW5, LC-SW7, LC-SW8, <br />LC-SW9 and LC-SW10) and discontinued the sampling of MW -33S and MW -35S. Additionally, <br />Geosyntec working on behalf of the SWDD in 2021 reduced the collection frequency of arsenic, <br />benzene, naphthalene, 1 -methylnaphthalene, 2 -methylnaphthalene, acenaphthene, and anthracene <br />at MW -21 S and MW -49S from quarterly to semi-annual. Geosyntec will continue working with <br />the FDEP to further reduced the surface and groundwater quarterly sampling scope at the C&D <br />debris disposal facility in 2024 in order to provide overall cost savings to the County. <br />Therefore, in addition to the semi-annual sampling of the C&D debris disposal facility <br />monitoring wells in January and July 2024, six wells and four surface water sample sites will <br />also be sampled in April and October 2024 as part of the 2024 compliance monitoring and <br />reporting program. <br />Quarterly Assessment Monitoring for the Class I Landfill <br />A comment letter from the FDEP dated 6 May 2020 provided comments regarding the results of <br />the January 2020 Semi -Annual Water Quality Monitoring Report for the Class I landfill. The <br />FDEP provided notification to the SWDD to initiate evaluation monitoring at all monitoring <br />wells with detected exceedances above applicable (GCTLs for pH, ammonia, chloride, sodium, <br />total dissolved solids (TDS) and arsenic. Geosyntec provided a response to comments (RTC) <br />letter to the FDEP comment letter on 28 May 2020 which focused on the long-term trends with <br />the dataset available from the FDEP Water Assurance Compliance System (WACS) database <br />and requested a reduction of evaluation monitoring locations from 25 locations (as originally <br />requested by the FDEP in the 8 May 2020 letter) to four (4) locations (specifically downgradient <br />of MW -3S, MW -14S, MW -44S and MW -441). The FDEP approved this request in a letter dated <br />14 August 2020 and the 90 -day evaluation monitoring period was initiated on 17 September <br />2020 through a second RTC letter provided to the FDEP. Geosyntec installed the three (3) <br />groundwater evaluation monitoring wells in November 2020 (evaluation monitoring well not <br />installed downgradient of MW -14S since MW -14S was already located at the edge of the Class I <br />landfill zone of discharge), sampled the four (4) quarterly wells and collected field parameters <br />NCP2323548/JL23073 2024 Compliance Monitoring Proposal <br />engineers I scientists I innovators <br />