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2021-082D
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Last modified
6/17/2021 10:39:54 AM
Creation date
6/15/2021 11:16:06 AM
Metadata
Fields
Template:
Official Documents
Official Document Type
Amendment
Approved Date
06/08/2021
Control Number
2021-082D
Agenda Item Number
8.R.
Entity Name
CDM Smith
Subject
Amendment 2 to Work Order No. 5 for Groundwater Modeling & Impact Evaluation Permit No. 10524
moved from Consent Agenda to Utility Services prior to the meeting
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EXHIBIT A <br />CCNA-2018 WO NO.5 <br />AMENDMENT NO. 2 <br />Ze7;l <br />INDIAN RIVER COUNTY UTILITIES <br />ADDITIONAL GROUNDWATER MODELING SIMULATIONS IN SUPPORT <br />OF MODIFICATION OF WATER USE PERMIT NUMBER 10524 <br />This Amendment, when executed, shall be incorporated in and become part of the Agreement for <br />Professional Services (Contract #2018008) between Indian River County (OWNER), and CDM Smith Inc. <br />(CONSULTANT), dated April 17, 2018, extended and amended May 18, 2021, hereafter referred to as the <br />Agreement. <br />PROJECT BACKGROUND <br />The OWNER operates two Water Treatment Plants (WTPs), the South County WTP and North County <br />WTP. The South County WTP withdraws groundwater from seven existing Upper Floridan Aquifer (UFA) <br />production wells, while the North County WTP relies on groundwater from nine existing UFA production <br />wells. OWNERS's existing Consumptive Use Permit (CUP) (10524) currently allows for a total combined <br />groundwater withdrawal allocation of 12.838 million gallons per day [mgd], with 6.438 mgd from the <br />North County wellfield and 6.40 mgd from the South County wellfield. <br />The current CUP expires on October 11, 2031. OWNER has experienced an increase in demand due to <br />population growth and domestic self -supply users switching over to OWNER's water supply. OWNER <br />began a draft application requesting modification of the existing CUP to the St. Johns River Water <br />Management District (SJRWMD) in 2016. Groundwater modeling was performed to determine if there <br />would be impacts on the water resources, environment, or other permitted users due to the anticipated <br />increases in OWNER withdrawals from the UFA. CONSULTANT used a modified version of the South <br />Florida Water Management District (SFWMD) East Coast Floridan Aquifer Model (ECFM) to perform the <br />impact analysis for the UFA. Since the ECFM did not include the Surficial Aquifer System (SAS), the <br />SJRWMD Coupled Aquifer (COUAQ) model was used to determine the drawdown if any in the Surficial <br />Aquifer System (SAS) due to increased pumping'and groundwater level drawdown in the UFA. The <br />groundwater modeling results and analysis were summarized in a report that along with the model <br />input and output files were submitted to the SJRWMD in support of the draft CUP application. SJRWMD <br />staff previously approved the model as the best tool available for UFA uses in the area and the results of <br />the modeling and impact evaluations. <br />Due to the resurgence of development, the OWNER must now modify the permit to account for the new <br />and future demand projections. Based on actual groundwater withdrawals and an -approximate 2 <br />percent increase in demands overtime (including an expanded service area), the 2050 demand was <br />calculated to be 23.18 mgd. This is an increase from the existing EOP withdrawal of 12.838 mgd, which <br />was used in the draft 2016 CUP application and the associated groundwater modeling and impact <br />analysis. <br />Simth Page 1 of 6 jJaoos_e■n b �.ao� <br />
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