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Mr. Himanshu H. Mehta, P.E. 22 April 2024 Page 4 Geosyntec consultants be analyzed in accordance with the sampling plan summarized in the 2023 Annual Groundwater Monitoring Report (GMR). Quality control (QC) samples are proposed to be collected at a rate of 5% of total samples as required by the most recent FDEP SOPS, resulting in 2 QC samples annually. Geosyntec will conduct a round of groundwater level measurements in accordance with the sampling plan summarized in the 2023 Annual GMR concurrent with each semi-annual groundwater sampling event (budgeted for 1 day with 2 -person field team for each event). Depth to groundwater measurements will be recorded to the nearest 0.01 -ft in each monitoring well, including existing monitoring wells and applicable City of Vero Beach wells (assumed up to 60 wells per event). Overall, for field activities, budget has been included for 6 field days with 2 persons, mobilization time for field personnel, and associated field expenses for sampling. Due to wet site conditions and difficult access to certain well clusters, costs for rental of a utility phase vehicle are included for 1 day of groundwater level measurements and 1 day of sampling per event (4 total days). It is anticipated that purge water (investigation -derived waste [IDW]) will be containerized in a 55 - gallon polyethylene drum and temporarily staged on Site for characterization prior to removal and disposal. Costs are included herein for purchase of one 55 -gallon polyethylene drum, drum removal and disposal by a licensed subcontractor, and for 4 hours of drum removal oversight for 1 person. Brush clearing by a contractor is necessary on a biannual basis to clear overgrowth and maintain access to the well clusters and was last performed at the Site in October 2022. In 2024, Geosyntec will provide oversight for a contractor to clear shrubs, vines, and tall grass in an approximate 6 feet radius around select well clusters using a track loader with mower deck. Costs are included for one day oversight (with one person) and for subcontractor costs. Phase 5 — Data Evaluation and Annual Reporting: Under this phase, Geosyntec will perform data evaluation activities and reporting. The reporting includes preparation of the 2024 Annual GMR for submittal to FDEP. The 2024 Annual GMR will be consistent with the groundwater monitoring reports historically submitted to FDEP for this Site and the data evaluation activities will include database management, screening results against applicable regulatory criteria, GIS figure preparation, time trend analyses, and/or statistical data analyses. The report will be supported by attachments containing Chain -of - Custody sheets, field notes and observations, water sampling logs, maps, graphs, analytical results, quantitative statistical evaluation, and other applicable materials. As part of the statistical analysis, trend analysis graphs showing temporal concentrations of constituents and a summary of the Mann - Kendall statistics will be included to identify increasing, decreasing, or no trends in groundwater constituent concentrations. The draft 2024 Annual GMR will be submitted to IRC SWDD for review FR0766\XR24015.docx engineers I scientists I innovators