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Mr. Himanshu H. Mehta, P.E. 5 May 2017 Page 3 GeosyntecO' consultants objective of GASB No. 49 is to enhance the usefulness and comparability of pollution remediation obligation information reported by state and local governments. It has been assumed that the report will include evaluation of two sites, including South Gifford Road Closed Landfill (4701 41" Street) and Old Administration Building (1840 25th Street). Task 4 — Semi -Annual Sampling Activities: Under this task, Geosyntec will perform 2017 field activities related to the plume groundwater monitoring. The semi-annual activities will include field preparation, groundwater sampling, and water level measurements. Field preparation activities will include scheduling and staffing, subcontracting, coordination with the analytical laboratory, field equipment preparation, procurement of Passive Diffusion Bag (PDB) samplers, and notifying FDEP and Vero Beach Municipal Airport of the field schedule. In addition, as required by Chapter 62-528 of the Florida Administrative Code (F.A.C.), underground injection control (UIC) monitoring of GR-MW30B will be completed. A single performance monitoring well (MW -37C) was installed in conjunction with the RAPM3 implementation and will be included the in semi-annual sampling plan for analysis of bioremediation performance parameters, including dissolved gasses, total organic carbon, and dechlorinating microbial concentration. Geosyntec will perform the groundwater sampling activities associated with the CVOC plume monitoring wells. Sampling activities will be completed with a combination of PDB 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 annual field event will be conducted in summer 2017 (tentatively in June) and will include sampling of nine monitoring wells (five wells using PDBs and four wells with traditional sampling techniques). The annual 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 semi-annual field event will be conducted in winter 2017 (tentatively in December) and will include sampling of 47 monitoring wells (38 wells using PDBs and nine wells with traditional sampling techniques). The semi-annual field event is budgeted to include a total ofthree days (with two persons) for groundwater sampling activities and PDB deployment for the next 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 December 2016 Semi -Annual Groundwater Monitoring Report and RAPM3 implementation plan. 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 XR17051TR17015 engineers I scientists 1 innovators P225