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Mr. Himanshu H. Mehta, P.E. 21 May 2025 Page 3 GeosMtec consuttants included for the Senior Principal -in -charge to provide ongoing support to IRC SWDD related to interaction and negotiation with FDEP. 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 Former South Gifford Road 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 2025 routine semi-annual groundwater monitoring. The semi-annual activities will include field preparation, water level measurements, and groundwater sampling. Field preparation activities will include scheduling and staffing, subcontracting, coordination with the analytical laboratory, field equipment preparation, procurement of Passive Diffusion Bag (PDB) samplers, coordination with Vero Beach Municipal Airport for water level measurement, and notifying FDEP of the field schedule. Geosyntec will perform the groundwater sampling activities associated with the CVOC plume monitoring well network. Sampling activities in 2025 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 2 -person sampling crew and will be performed in accordance with the FDEP Standard Operating Procedures (SOPS). The proposed Summer 2025 field event (tentatively scheduled for June 2025) will include sampling and analyses of groundwater from 7 monitoring wells. The Summer 2025 field event is budgeted to include 1 day with 2 people for groundwater sampling and PDB deployment activities for the next sampling event. The proposed Winter 2025 field event (tentatively scheduled for December 2025) will include sampling of 26 monitoring wells (19 using PDBs and 7 wells via traditional purging techniques to collect field water quality parameters). The Winter 2025 field event is budgeted to include a total of 3 days (with 2 people) for groundwater sampling activities and PDB deployment for the Summer 2026 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 2024 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. FR0766\XR25016 engineers I scientists I innovators