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Mr. Himanshu H. Mehta, P.E. Geosyntec c" <br /> 5 May 2017 consultants <br /> Page 3 <br /> objective of GASB No. 49 is to enhance the usefulness and comparability of pollution remediation <br /> obligation information reported by state and local governments. It has been assumed that the report <br /> will include evaluation of two sites, including South Gifford Road Closed Landfill (4701 41' <br /> Street) and Old Administration Building (1840 25th Street). <br /> Task 4—Semi-Annual Sampling Activities: Under this task, Geosyntec will perform 2017 field <br /> activities related to the plume groundwater monitoring. The semi-annual activities will include <br /> field preparation, groundwater sampling, and water level measurements. Field preparation <br /> activities will include scheduling and staffing, subcontracting, coordination with the analytical <br /> laboratory, field equipment preparation, procurement of Passive Diffusion Bag (PDB) samplers, <br /> and notifying FDEP and Vero Beach Municipal Airport of the field schedule. In addition, as <br /> required by Chapter 62-528 of the Florida Administrative Code (F.A.C.), underground injection <br /> control (UIC) monitoring of GR-MW3OB will be completed. A single performance monitoring <br /> well (MW-37C) was installed in conjunction with the RAPM3 implementation and will be <br /> included the in semi-annual sampling plan for analysis of bioremediation performance parameters, <br /> including dissolved gasses, total organic carbon, and dechlorinating microbial concentration. <br /> Geosyntec will perform the groundwater sampling activities associated with the CVOC plume <br /> monitoring wells. Sampling activities will be completed with a combination of PDB samplers and <br /> traditional low-flow sampling techniques. PDBs are anticipated to be purchased from EON <br /> Products, one of the few suppliers of this type of passive sampling device. Groundwater sampling <br /> activities will be executed using a two-person sampling crew and will be performed in general <br /> accordance with the FDEP Standard Operating Procedures (SOPs). The proposed annual field <br /> event will be conducted in summer 2017 (tentatively in June) and will include sampling of nine <br /> monitoring wells(five wells using PDBs and four wells with traditional sampling techniques).The <br /> annual field event is budgeted to include one day for groundwater sampling activities and one day <br /> for PDB deployment for the next sampling event (total of two field days each with two persons). <br /> The proposed semi-annual field event will be conducted in winter 2017 (tentatively in December) <br /> and will include sampling of 47 monitoring wells (38 wells using PDBs and nine wells with <br /> traditional sampling techniques).The semi-annual field event is budgeted to include a total of three <br /> days (with two persons) for groundwater sampling activities and PDB deployment for the next <br /> sampling event. Consistent field documentation and field protocols will be utilized to develop <br /> reliable data to support the natural attenuation evaluation for the groundwater plume. The <br /> groundwater samples will be analyzed in accordance with the sampling plan summarized in the <br /> December 2016 Semi-Annual Groundwater Monitoring Report and RAPM3 implementation plan. <br /> Geosyntec will conduct a complete round of groundwater level measurements coincident with each <br /> semi-annual groundwater sampling event (budgeted for one day with two-person field team for <br /> each event). Depth to groundwater measurements will be recorded to the nearest 0.01-ft in each <br /> XR 17051\PR 17015 <br /> engineers I scientists I innovators <br />