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i INDIAN RIVER COUNTY zj ;) 7- ? , DEPARTMENT OF UTILITY SERVICES AGENDA ITEM Date : Tuesday , January 2 , 2007 To : Joseph A. ird , CVctorof ministrator From : W . Erik OI A. & ittility Services Through : Himanshu H . Mehta , P . E . , Environmental Engineer Prepared & Terry Southard Operations Manager<ZJ Staffed By: Department of Utility Services Subject: South County Reverse Osmosis Plant - FDEP Permit Renewal for Demineralized Concentrate Disposal Work Order No . 6 — Professional Services to Kimley-Horn & Associates , Inc. Amendment No . 2 to Work Order No . 6 BACKGROUND : Indian River County's ( IRC ) South Reverse Osmosis , (RO) , water treatment facility, (Oslo Road ) , currently has a permit to produce 8 . 57 million gallons per day (mgd ) of product water via four RO skids. The RO process produces a reject by-product, or demineralized concentrate , flow of 1 . 2 mgd (average ) . The concentrate is disposed to a surface water body under Florida Department of Environmental Protection , (FDEP ), Permit 31 - FL0037940-Minor National Pollutant Discharge Elimination Source , ( NPDES ), and Non-Public Operated Treatment Works , (NPOTW) Discharge . The permit allows for 1 . 5 mgd maximum daily flow of concentrate disposal to the South relief canal , and expires December 14 , 2005 . A permit renewal application , including supporting data , was submitted on June 17, 2005 , in accordance with specific condition VII . C. 1 . On Tuesday, February 8 , 2005, the Board of County Commissioners approved Work Order No. 6 to Kimley - Horn , Inc. in the total amount of $68,000 for professional services related to the preparation and submittal of the required FDEP permit package for Concentrate Disposal Permit. On August 2 , 2005 the Board of County Commissioners approved an Amendment No. 1 to Work Order No . 6 in the amount of $21 , 180. 00 for additional testing to determine if it can be demonstrated that the current treatment process applied to the demineralized concentrate is the cause of a random but repeated failures in bioassay testing . The attached Amendment with Kimley-Horn is for the testing protocol proposed to be conducted on the water treatment demineralized concentrate . FDEP has requested additional analytical investigations into the reject by-product to the cause of random bioassay test failures . Through RAI 's (Request For Additional Information ) FDEP opinion is that the intermittent toxicity is a result of MSIIT (Major Seawater Ion Imbalance ) FDEP has requested water chemistry testing of those ions associated with MSIIT on demineralized concentrate treated by the current chlorine/aeration as well as the aerated only process . The data collected is to be compared in a fashion similar to that used in comparing water quality data from the raw water supply wells serving the facility. FJ.Otdltles\UTILITY - LNONEF,RING'WTP - South ROTDEP Permit Renewal March 2005 - Kimley-Ham Work Order WAgit - Kimely Ham SCRO Amendment 2 to WO 6 January 200).doc