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Mr. Himanshu H. Mehta, P.E. 2 June 2022 Page 3 Geosyntec consultants Phase 3 — Annual Pollution Remediation Liabilities Evaluation: As requested by IRC SWDD, under this phase, Geosyntec will prepare the annual environmental liability evaluation. This document is prepared annually in response to Governmental Accounting Standards Board Statement No. 49 (GASB No. 49), Accounting and Financial Reporting for Pollution Remediation Obligations, which requires the inclusion and calculation of pollution remediation obligations. The objective of GASB No. 49 is to enhance the usefulness and comparability of pollution remediation obligation information reported by state and local governments. It has been assumed that the report will include evaluation of two sites, including South Gifford Road Closed Landfill (4701 41St Street) and Former Premier Citrus Property (375 82nd Street). In addition, two hours have been included for a Florida registered professional engineer to conduct an independent review of the liability evaluation. Phase 4 — Semi -Annual Sampling Activities: Under this phase, Geosyntec will perform 2022 field activities related to the performance monitoring and plume groundwater monitoring. The semi-annual activities will include field preparation, groundwater sampling, and water level measurements. Field preparation activities will include scheduling and staffing, subcontracting, coordination with the analytical laboratory, field equipment preparation, procurement of Passive Diffusion Bag (PDB) samplers, and notifying FDEP and Vero Beach Municipal Airport of the field schedule. Geosyntec will perform the groundwater sampling activities associated with the CVOC plume monitoring well network. Sampling activities in 2022 will be completed with a combination of PDB samplers, as a cost -savings measure, and traditional low -flow sampling techniques, to evaluate groundwater quality and the occurrence of intrinsic biodegradation. PDBs are anticipated to be purchased from EON Products, one of the few suppliers of this type of passive sampling device. Groundwater sampling activities will be executed using a two -person sampling crew and will be performed in general accordance with the FDEP Standard Operating Procedures (SOPs). The proposed summer 2022 field event (tentatively scheduled for the week of 27 June 2022) will include sampling and analyses of groundwater from nine monitoring wells. The summer 2022 field event is budgeted to include one day for groundwater sampling activities and one day for PDB deployment for the next sampling event (total of two [2] field days each with two persons). The proposed winter 2022 field event (tentatively scheduled for December 2022) will include sampling of 42 monitoring wells (31 using PDBs and 11 wells via traditional purging techniques) to collect field water quality parameters. The winter 2022 field event is budgeted to include a total of two (2) days (with two persons) for groundwater sampling activities and PDB deployment for the summer 2023 field event. Consistent field documentation and field protocols will be utilized to develop reliable data to support the natural attenuation evaluation for the groundwater plume. The groundwater samples will be analyzed in accordance with the sampling plan summarized in the 2021 Annual Groundwater Monitoring Report. Quality control samples are proposed to be collected at a rate of 5% of total samples as required by the most recent FDEP SOPs. FR0766\XR22024.docx engineers I scientists I innovators