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Mr. Himanshu Mehta, P.E. <br />22 April 2024 <br />Page 2 <br />Geosyntec personnel and a drilling subcontractor mobilized to the site the week of 9 October 2023 <br />for field activities related to the RAPM No. 4. Groundwater samples were collected using direct <br />push technology (DPT) drilling in the vicinity of the former source area and northwest of the <br />former source area. Data from the RAPM No. 4 field activities and next step recommendations <br />were submitted to FDEP at the same time as the 2023 Annual Groundwater Monitoring Report <br />(GMR). The Annual Pollution Remediation Liabilities Evaluation was submitted to IRC on 31 <br />October 2023. The winter 2023 semi-annual groundwater monitoring event was completed the <br />week of 4 December 2023. Due to inconsistencies in the groundwater analytical data reported in <br />December 2023 at three monitoring wells, Geosyntec personnel remobilized to the Site on 6 and <br />7 February 2024 to redevelop the wells and collect confirmation groundwater samples. This <br />additional effort is covered under the current authorization. The 2023 Annual GMR was submitted <br />to FDEP on 28 February 2024 and recommended to significantly reduce the plume monitoring <br />well network. Investigation -derived waste (IDW) generated during 2023 and 2024 field activities <br />and containerized in a 55 -gallon polyethylene drum was removed and disposed of by a licensed <br />subcontractor in March 2024. <br />Work Reflected on Enclosed Invoice <br />Reimbursable expenses ($862.50) reflected on the enclosed invoice are associated with <br />subcontractor costs for offsite transport and disposal of six 55 -gallon drums of nonhazardous <br />liquids. <br />CLOSURE <br />Geosyntec appreciates the opportunity to provide services to Indian River County. If you have any <br />questions regarding this correspondence, please feel free to contact me at (850) 483-5102. <br />Sincerely, <br />Crystal Wilson, P.G. (FL) <br />Senior Geologist <br />FR0766U/PR24016.docx <br />engineers I scientists I innovators <br />161 <br />