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Mr. Himanshu H. Mehta, P.E. 2 April 2020 Page 4 Geosyntec consultants samplers and traditional low -flow sampling techniques. PDBs are anticipated to be purchased from EON Products, one of the few suppliers of this type of passive sampling device. Groundwater sampling activities will be executed using a two -person sampling crew and will be performed in general accordance with the FDEP Standard Operating Procedures (SOPS). The proposed summer 2020 field event (tentatively scheduled for June) will include sampling of nine monitoring wells (six wells using PDBs and three wells with traditional sampling techniques). The summer 2020 field event is budgeted to include one day for groundwater sampling activities and one day for PDB deployment for the next sampling event (total of two field days each with two persons). The proposed winter 2020 field event (tentatively scheduled for December) will include sampling of 47 monitoring wells (38 wells using PDBs and nine wells with traditional sampling techniques). The winter 2020 field event is budgeted to include a total of three and one-half days (with two persons) for groundwater sampling activities and PDB deployment for the summer 2020 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 2019 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 [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 purchase and delivery to the site for two 55 -gallon polyethylene drums and for one-half day of drum disposal oversight for one person. During the monitoring well inventory conducted by Geosyntec personnel during the winter 2019 field event, 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 in an approximate 6 ft radius around select well clusters in conjunction with the winter 2020 field event to maintain access to well clusters. Costs are included for two days oversight (with one person) and for subcontractor costs. FR0766\XR20017 engineers I scientists I innovators