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Mr. Himanshu Mehta, P.E. <br />22 April 2024 <br />Page 3 <br />Under this phase in October 2023, Geosyntec provided oversight for a contractor to clear brush in <br />the former source area in preparation for drilling rig mobilization and groundwater sample <br />collection. Geosyntec also provided oversight for a private underground utility survey of the <br />proposed drilling locations. Sixty groundwater samples were collected using direct push technology <br />(DPT) drilling in the vicinity of the former source area and northwest of the former source area. <br />Two continuous soil borings were advanced to record site lithology and evaluate mass distribution <br />using a photoionization detector (PID). <br />Investigative -derived waste generated during 2023 and 2024 field activities was containerized in <br />55 -gallon polyethylene drums, characterized as non -hazardous by laboratory analyses, and removed <br />and disposed of by a licensed subcontractor in March 2024. <br />Phase 7 — Prepare RAPM Addendum No. 4 <br />Initial analysis of the pre-RAPM Addendum No. 4 DPT groundwater analytical and soil screening <br />data indicated inconsistencies when compared to nearby monitoring well data. Although not <br />originally scoped in Work Order No. 2, Geosyntec personnel mobilized to the site and redeveloped <br />three monitoring wells and collected confirmation samples within the budget of the current <br />approval. Confirmation groundwater samples were more consistent with historical results and <br />indicated that enhanced bioremediation processes are actively occurring and additional injection to <br />stimulate these processes is not prudent at this time. A Groundwater Investigation Memorandum <br />documenting DPT groundwater data collected in October 2023, as well as groundwater data <br />collected in June and December 2023 and February 2024 from monitoring wells was submitted to <br />FDEP as Appendix A to the 2023 Annual GMR. <br />BUDGET <br />The approved budget for Work Order No. 2 was $171,433.02. The total invoiced amount, including <br />the final invoice, is $171,393.92. Geosyntec completed this project below the approved budget. <br />CLOSURE <br />Geosyntec appreciates the opportunity to provide services to Indian River County. If you have any <br />question regarding this correspondence, please feel free to contact the undersigned at 850 483-5102. <br />Crystal Wilson, P.G. (FL, AL) <br />Senior Geologist <br />PR24013_Proiect Completion WO No 2_FR0766U.doc <br />engineers I scientists I innovators <br />Sincerely, <br />4. g ot<kr <br />Joseph Applegate, P.G. (FL) <br />Senior Principal Geologist <br />158 <br />