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Mr. Himanshu H. Mehta, P.E. 30 April 2018 Page 4 Geosyntec consultants December) will include sampling of 47 monitoring wells (37 wells using PDBs and ten wells with traditional sampling techniques). The winter 2018 field event is budgeted to include a total of three days (with two persons) for groundwater sampling activities and PDB deployment for the summer 2019 sampling 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 2017 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 coincident 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 90 wells per event). It is anticipated that purge water (investigation -derived waste [IDW]) 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 two 55 -gallon polyethylene drums and oversight of drum disposal concurrent with one of the sampling events. Overall, budget has been included for six field days with a two -person team (i.e., 12 man days) and associated field expenses for sampling. Task 5 — Monitoring Well Maintenance: A monitoring well inventory was conducted by Geosyntec personnel in December 2017 to document maintenance needs, including top of casings that had shifted above well completions, new well plugs, and/or new manhole lids. Based on observations, maintenance activities are necessary, as discussed with IRC, to repair well pads at three cluster locations, GR-MW13, GR-MW27, GR-MW32. Geosyntec will provide oversight for a subcontractor to repair tops of casings and replace well pads. A Florida -licensed surveyor will survey the repaired monitoring wells and performance monitoring well GR-MW37B to identify the location and relevant elevation information (e.g., top of casing, ground surface). Monitoring well maintenance will be performed prior to the summer 2018 semi-annual groundwater monitoring event. Task 6 — Brush Clearing Activities: During the monitoring well inventory conducted by Geosyntec personnel in December 2017, approximately 20 well clusters were noted to be overgrown by brush or tall grass impeding access for sample collection. Geosyntec will provide oversight for a contractor to clear brush and mow undergrowth in an approximate 6 feet radius around select well clusters. Brush clearing activities will be performed prior to the summer 2018 semi-annual groundwater monitoring event. FR0766\XR18011 engineers I scientists I innovators