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Mr. Himanshu Mehta, P.E. <br />22 April 2024 <br />Page 2 <br />Phase 2 — Meetines/Remlatory Interaction <br />Under this phase, Geosyntec provided ongoing support to IRC SWDD related to interaction and <br />negotiation with FDEP. <br />Phase 3 — Annual Pollution Remediation Liabilities Evaluation <br />Under this phase, Geosyntec prepared the annual environmental liability evaluation in response to <br />Governmental Accounting Standards Board Statement No. 49 (GASB No. 49), Accounting and <br />Financial Reporting for Pollution Remediation Obligations, which requires the inclusion and <br />calculation of pollution remediation obligations. The report included the evaluation of two sites, <br />South Gifford Road Closed Landfill (4701 41St Street) and Former Premier Citrus — Commander <br />Groves Property (375 82nd Avenue) and was submitted to IRC on 31 October 2023. <br />Phase 4 — Semi -Annual SamDline Activities <br />Under this phase, Geosyntec conducted field preparation and groundwater sampling activities for <br />two semi-annual groundwater monitoring events in June and December 2023. Throughout these <br />sampling events, a total of 52 groundwater samples for analysis for volatile organic compounds <br />(VOCs) were collected under this work authorization. <br />Phase 5 — Data Evaluation and Semi -Annual Reporting <br />Under this phase, Geosyntec prepared the semi-annual reports for the June and December 2023 <br />groundwater sampling events. As part of the report preparation, Geosyntec completed database <br />management, data evaluation, trend evaluation, table preparation, and GIS figure preparation. <br />Groundwater monitoring results in 2023 suggested that the plume monitoring well network could be <br />reduced to account for plume shrinkage since the previous 2017 bioremediation injection targeting <br />chlorinated VOCs (CVOCs). In the 2023 Annual Groundwater Monitoring Report (GMR) <br />submitted to FDEP on 28 February 2024, Geosyntec recommended to remove 16 monitoring wells <br />from the 2024 sampling and analysis plan, reducing the number of monitoring wells sampled from <br />42 to 26, a 38% decrease. Geosyntec also recommended to change the reporting frequency from <br />semi-annual to annual. FDEP approved these recommendations to reduce sampling and reporting <br />frequency in an approval letter dated 18 March 2024. <br />Phase 6 — Pre-RAPM Addendum No. 4 Iniection Activities <br />Under this phase in June 2023, Geosyntec personnel collected groundwater samples from seven <br />monitoring wells to evaluate concentrations of dechlorination indicators including dissolved gases, <br />total organic carbon, and microbial populations. <br />PR24013_Project Completion WO No 2 FR0766U.doc <br />engineers I scientists I innovators <br />157 <br />