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Mr. Erik Olson Page 2 September 17, 2008 assessment. Ensuring that adverse impacts to existing legal users , local wetlands , and localized ground water quality does not occur cannot be accomplished without the additional resolution that the County model is attaining. I encourage you all to contact us if, in responding to the questions, any clarification is needed. " For clarity, we are providing a brief description of what SJRWMD and PBS&J agreed to do with regards to RAI No. 4, as well as a basic budget for accomplishing those tasks. Please note that the responses to RAI No. 4 Comments Nos . 1 through 5 are essentially complete and not included in this request. To complete the basic modeling refinements/revisions associated with question 6 will be $ 16,000. This includes converting the modeled drain cells to a three-canal configuration using the River Package, adjusting the other model input criteria (pumpage, leakance, recharge) as outlined in the request from SJRWMD, and adjusting the initial chloride concentration for the SEAWAT evaluation. Once this modeling is complete, there is a question of calibration. The model will most likely require calibration and can range from a minimum amount to $20,000. We would only charge the County for the actual efforts needed to calibrate the model (i . e . , time and materials), and if it appeared that the District would require additional calibration that would exceed $20,000, we would contact the County prior to completing additional work. The one comment that appears in both RAI No. 3 and RAI No. 4 is the request to have the modeling results appear in ASTM format. According to Rich Burklew, this is a staff request, not a permitting requirement. If the data and model are accepted by the District, we can present the model results in the RAI response without the need for reformatting the original model report to ASTM format. If the County would like to have the results reformatted, the cost for this work would be $9,000. The total fee assumed to respond to the fourth RAI is $47,000. The County could reduce this to $38,000 by not including the reformatting of the report. A further reduction may be realized if the calibration is minimal. Although some of the modeling data required is dependent on the SJRWMD responsiveness to data requests , we believe we can complete this work in time to avoid an extension to the RAI if notice to proceed is provided no later than September 30, 2008 . Otherwise, the County will need to seek an extension from SJRWMD. Your immediate consideration of this request is greatly appreciated. Should you have any questions, please call me at 863 -533 -7000. Sincerely, PBS&J, Inc. Kim S . Keefer, PE Associate C. Michael Hotchkiss, Michael Alfieri, Michael Micheau , Tom Farkas, Kevin Dorsey