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Mr. Himanshu H. Mehta, P.E. 27 April 2021 Page 4 Geosyntec D Consultants (tentatively scheduled for December) will include sampling of 42 monitoring wells (all using PDBs). The winter 2021 field event is budgeted to include a total of two and one-half (2.5) days (with two persons) for groundwater sampling activities and PDB deployment for the summer 2022 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 2020 Annual Groundwater :Monitoring Report. Quality control samples are proposed to be collected at a rate of 5% of total samples as required by the most recent FDEP SOPs. Geosyntec will conduct a complete round of groundwater level measurements concurrent with each semi-annual groundwater sampling event (budgeted for one day with two -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 95 wells per event). Due to wet site conditions and difficult access to certain well clusters, costs for rental -of a utility task vehicle are included for one day of groundwater level measurements and one day of sampling per event (4 total days). It is anticipated that purge water (investigation -derived waste [1DW]) will be containerized in 55 -gallon polyethylene drums and temporarily staged on Site for characterization prior to removal and disposal. Costs are included herein for purchase of one 55 -gallon :polyethylene drum and for one-half day of drum disposal oversight for one person. During the monitoring well inventory during the winter 2020 field event, Geosyntec personnel observed damage to one monitoring well, GR-MW06C, and maintenance activities are necessary to 'replace one bollard and repair the above ground polyvinyl. chloride (PVC) well casing which needs to be reattached to the aboveground portion of the well casing. Geosyntec will provide oversight for a subcontractor to make the repairs. Costs are included for one day of oversite (with one person) and for subcontractor costs. A Florida -licensed surveyor will survey the repaired monitoring well and :monitoring well GR-MW37B, installed in 2017. Overall, for field activities, budget has been included for seven and one-half field days for one person, six field days for a second person, (i.e., 13.5 man days); mobilization time for field personnel, and associated field expenses for sampling. Task 5 — Data Evaluation and Semi -Annual Reporting: Under this task, Geosyntec will perform data evaluation activities and reporting. The reporting includes preparation of one summer 2021 report (simplified format) and one winter 2021 report for submittal to FDEP. The summer 2021 report will be a letter report with attachments, including a monitoring well location map and tables of the field and laboratory results. Data evaluation activities for the summer 2021 report VR0766\XR2 1012 engineers I scientists I innovators