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2010-266
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Last modified
2/22/2016 1:29:39 PM
Creation date
10/1/2015 2:32:43 AM
Metadata
Fields
Template:
Official Documents
Official Document Type
Amendment
Approved Date
10/19/2010
Control Number
2010-266
Agenda Item Number
12.J.1
Entity Name
Post,Buckley,Schuh and Jernigan
St. John's River Water Management District
Subject
Amendment No.6 to Work Order No.2 Groundwater modeling
Consumptive Use permit
Supplemental fields
SmeadsoftID
9855
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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 />
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