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South Relief Canal Algal Turf Scrubber@ 1 . INTRODUCTION The Indian River County Utilities Department , in cooperation with the Public Works Department , Stormwater Division , have indicated intent to implement a water treatment facility to be located contiguous to the Indian River Farms Water Control District' s South Relief Canal within Indian River County—this canal being a major tributary within the network of canals managed by the Indian River Farms Water Control District ( IRFWCD ) . This proposed treatment system is to be designed around the application of an Algal Turf Scrubber® (ATSTM ) ' to remove nutrients and eliminate toxicity associated with a blend of an RO concentrate , as generated by the Utilities Department in the production of potable water, and surface waters associated with the South Relief Canal ( South Canal ) . The proposed treatment facility is referred to as PC South – Phase 1 . The RO concentrate is a mineralized water with a conductivity of about 6 , 000 microS/cm , and comparatively low nutrient levels . The canalized stormwater within the South Canal is characterized by lower conductivity levels ( < 2 , 400 microS/cm ) but higher phosphorus concentrations . Indian River County is coordinating with the FDEP to resolve concerns regarding the concentrate related to nutrient and salinity loads and intermittent toxicity revealed through bioassays with Mysid shrimp ( Mysidopsis bahia) . 2 Presently , management requirements associated with the RO concentrate are delineated within FDEP Permit 31 FL0037940 and the associated Consent Order 08 - 1661 , as well as applicable limits delineated within the latest update of Ch 62-302 F . A. C . The expected requirements for nutrient reduction within the South Canal stormwater flows are associated with the impending Total Maximum Daily Loads (TMDL) determination s . 3 On September 7 , 2010 , Indian River County authorized HydroMentia to conduct a comprehensive PC- South ATSTM pilot study . This study was designed to facilitate assessment of system performance in terms of both nutrient reduction , and toxicity attenuation . The pilot program was rendered operational on January 17 , 2011 . The facility was sustained operational to June 7 , 2011 . Data obtained during this period will be used in developing the permit application for the proposed treatment facility . The Utilities Department has requested a services and cost proposal from HydroMentia for completion of FDEP permit applications for the proposed water treatment facility . This proposal has been prepared in response to this request, and includes specific tasks and associated costs attendant with efforts needed to develop a complete application as related to the FDEP Wastewater Application Form 2CS — " PERMIT TO DISCHARGE PROCESS WASTEWATER FROM NEW OR EXISTING INDUSTRIAL WASTEWATER FACILITIESTO SURFACE WATER" . The Algal Turf Scrubber® orATSTM is an engineered system composed of a sloped expanse of high density polyethylene ( HDPE) geomembrane overlain with a synthetic grid matrix . Water is distributed across the sloped floway in a shallow laminar flow , which provides ideal conditions for the development of an algal turf community 2 Consent Order 08- 1661 executed September 19 , 2008 . 3 Total Maximum Daily Load for Northern and Central Indian River Lagoon and Banana River Nutrients and Dissolved Oxygen April 2007 . EPA Region IV . Indian River County ATSTM Permit Procurement Services Proposal 2 June 23 , 2011