Laserfiche WebLink
Document management portal powered by Laserfiche WebLink 9 © 1998-2015 Laserfiche. All rights reserved.
O P <br /> EXHIBIT 1 <br /> INDIAN RIVER COUNTY DEPARTMENT OF UTILITY SERVICES <br /> RESPONSE TO CUP RAI NO . 6 <br /> SCOPE OF SERVICES <br /> L PROJECT DESCRIPTION <br /> The St . Johns River Water Management District (District) issued Request for Information (RAI) No . 6 on <br /> October 30 , 2009 . The RAI has two questions . Question 1 requests changes to the model in 4 steps (a <br /> through d) . Question 2 requests demonstrating that existing legal users of water will not be adversely <br /> impacted by the proposed water use and a mitigation plan for any wells that may potentially be adversely <br /> affected by the County ' s proposed water use if IRC plans to mitigate impacted wells to avoid projected <br /> impacts . <br /> 11 . SCOPE OF SERVICES <br /> The following scope of services is proposed to prepare a response submittal to the RAI No . 6 questions <br /> identified above : <br /> Task 1 - Correct Model Calibration Bias ( Continents ] . a and Lb ) <br /> This task includes recalibrating the Indian River County model to address bias in the modeled heads , <br /> (particularly in the northwest and southwest corner of the model ) of the Upper Floridan aquifer . Model <br /> spatial bias criteria are subjective whereas other calibration criteria have specific numerical guidelines . <br /> The model was shown to be well or adequately calibrated using the available numerical guidelines in <br /> previous RAI response efforts . Because bias is subjective , the model was compared to the mega model , <br /> which was presumed to be the best available standard and that comparison showed a close match . <br /> Nevertheless the model will be recalibrated for the RAI 46 response to provide improvement to the spatial <br /> bias . <br /> This task also includes providing of layer-by -layer error statistics and a plot of observed heads versus <br /> modeled heads of the recalibrated model . <br /> Task 2- Address Model Boundary Conditions (Comment Lc and 1 d ) <br /> This task includes performing sensitivity simulations to demonstrate that the existing model extent can be <br /> used to perform predictive simulations without constraining the model results in the interior of the <br /> domain . This task also includes providing western and eastern boundary fluxes for all model layers for the <br /> 1995 and 2025 predictive simulations . <br /> Task 3 - Compile 2025Withdrawal Data File (Comment 2 ) <br /> Review of the provisional file of withdrawal points and quantities projected for 2025 within the IRC <br /> model domain that was provided by the District indicated that the withdrawal points and quantities were <br /> overstated . In addition , the District reported that projected withdrawal quantities for agricultural use <br /> within IRC have recently been reevaluated and die reevaluation resulted in a reduction of the projected <br /> withdrawal quantities . This task includes compiling an updated 2025 withdrawal data file from District <br /> and South Florida Water Management Distinct databases for use in modeling 2025 cumulative <br /> withdrawals . <br /> Task 4- Identify Unpermitted Small Diameter Wells ( Comment2 ) <br /> The areas within the modeled l -foot drawdown contours are considered the delineated areas where the <br /> projected drop in the potentiometric surface of the UFA could result in a 10 % or greater reduction of the <br /> 2 <br />