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Mr. Terry Southard 24 March 2010 Page 2 The Manager of the Indian River County Department that resides on the property to the west and north of the Indian River County North RO facility must be notified in writing that the sodium plume has been partially defined and may extend onto the property west of the site and that groundwater monitoring with specific conditions has been approved instead of further assessment at this time. In addition, the Indian River County Board must be notified in writing that the sodium plume may extend onto an adjacent Indian River County property and that monitoring with specific conditions rather than further assessment has been granted at this time. A copy of this letter shall be provided to both parties. Please provide copies of your letters to the Department. If either party requests that the plume be defined further, then the Department will require the extent of the sodium plume to be defined completely. • The parameters of analysis shall be total dissolved solids, chloride, sodium and sulfate for groundwater samples. The field measurements during purging shall be temperature, pH, specific conductance, turbidity and dissolved oxygen. Purging and sampling methods in the Department's Standard Operating Procedures shall be followed. Reports for each groundwater monitoring event shall include a cumulative summary table of all groundwater monitoring results including from assessment phases. The parameters reported in the table shall be pH, turbidity, total dissolved solids, chloride, sulfate and sodium. Reports shall contain a map depicting the direction of groundwater flow and maps depicting plumes. Reports shall contain copies of f eld sampling logs and laboratory reports. • The number of wells and monitoring frequency of the groundwater monitoring plan may be reduced in the future after a sufficient number of results are reported and a request is submitted. The proposed scope of work summarized below is intended to only provide reporting documentation regarding the implementation of the NAM Plan for quarterly monitoring (four monitoring events total) for a duration of one year at the Site and respond to FDEP comments in a cost effective manner. Please note that IRC has indicated that they will subcontract the sampling activities and provide Geosyntec with documentation from the sampling efforts that will be compliant with all applicable FDEP guidance and standard operating procedures (SOPs). PROPOSED SCOPE OF WORK Task 1 through Task 4 — NAM Report Preparation (4 Quarterly Submittals) For each event, upon receipt from IRC of the final data package of the field activities and the laboratory results of the groundwater sampling effort, Geosyntec will evaluate the data and incorporate these findings into a quarterly report for submission to FDEP within approximately 60 days from the date of sample collection, as proposed in the NAM Plan. As a contingency required in the 21 December 2009 FDEP letter, if sodium concentrations increase above the XRI0051/XR10051 IRC North RO NAM Reporting Proposal.Doc engineers I scientists I innovators