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Mr. Himanshu H. Mehta, P.E. 19 April 2013 Page 4 sampling device and the only analytical laboratory that supplies them. This effort is anticipated to be completed by one field person within one day . PDBs for subsequent events will be deployed after each of the semi-annual sampling events are completed to save an additional mobilization (e .g. the PDBs to be sampled during the winter 2013 sampling event will be deployed during the summer 2013 event after sampling activities are completed) . 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 2013 (tentatively in June) and will include sampling of 62 monitoring wells (41 wells using PDBs and 21 wells with traditional sampling techniques) . The annual field event is budgeted to include one day for PDB deployment (as a separate mobilization at least 14 days prior to sample collection), three days for groundwater sampling activities, and one day for PDB deployment for the next sampling event (total of five field days) . The proposed semi-annual field event will be conducted in winter 2013 (tentatively in December) and will include sampling of 29 monitoring wells ( 12 wells using PDBs and 17 wells with traditional sampling techniques) . The semi-annual field event is budgeted to include two days for groundwater sampling activities and one day for PDB deployment for the next sampling event (total of three days) . Consistent field documentation and field protocols will be utilized to develop reliable data to support the natural attenuation of the groundwater plume . The groundwater samples will be analyzed in accordance with the sampling plan summarized in Table 9 of the December 2012 Semi-Annual Groundwater Monitoring Report. In addition, three samples will be analyzed for Total Recoverable Petroleum Hydrocarbons (TRPH), Total Dissolved Solids (TDS), sodium, chloride , and bromide, in follow-up to the injection activities completed in 2012 , as requested by FDEP. 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 88 wells) . It is anticipated that purge water (investigation-derived waste [IDW]) will be treated in the existing air stripper sump (using a temporarily connected air compressor) and discharged to the sanitary sewer following treatment. No costs are included herein for IDW disposal or analytical costs . XR13056\PR13006 041713 .docx engineers I scientists I innovators