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Contract #27199 Encumbrance # S005605 ATTACHMENT A — STATEMENT OF WORK Indian River County Pollution Control (PC) South Phase 1 Algal Turf Scrubber System I . INTRODUCTION The South Relief Canal of the Indian River Farms Water Control District (1RFWCD ) provides drainage for a 12 , 500 -acre basin composed of a mix of developed industrial , residential , connnercial , and agricultural land . The nutrient-rich flow through the canal to the Indian River Lagoon averages 26 million gallons per day (MGD ) . Indian River County has proposed development of the Indian River County Pollution Control (PC) South Phase 1 Algal Turf Scrubber System ( ATS ) to treat 10 million gallons per day of this polluted water in an effort to reduce pollution to the Indian River Lagoon . The ATS will remove dissolved nitrogen and phosphorus from the canal water and a polishing pond/wetland system included in the treatment train downstream of the ATS will remove remaining solid particles from the treated water. In addition, the undeveloped land surrounding the ATS will be fenced and converted into a gopher tortoise preserve . Assuming a 6 -month dry period and a 6 -month rainy period , the projected nutrient removal ranges by the ATS are: 1 , 830 to 3 , 280 dry pounds/year of total phosphorus , and 8 , 190 to 14 ,400 dry pounds/year of total nitrogen . This represents 915 to 1 , 640 forty-pound bags of 10 - 15 - 10 (N -P - K) fertilizer with respect to total phosphorus and 2 , 048 to 3 , 600 bags of fertilizer with respect to total nitrogen. These quantities do not include the total nitrogen and total phosphorus that the ATS will remove from the RO reject water . A related project component required under a consent decree with FDEP and Indian River County Utilities is outside the scope of this cooperative funding agreement . The related component consists of design of a pumping station located at the South RO Water Treatment plant to pump reject water into the ATS influent structure where it will mix and blend with the canal water. The project design will allow up to 1 . 5 million gallons per day of reject water to be pumped to PC South ' s ATS for treatment and dilution . Future plans include a system to disinfect treated canal water and place it into a new County reuse water system . The treated water not used in the irrigation reuse system will be returned to the South Relief Canal where it will continue its journey to the Indian River Lagoon . II . OBJECTIVES The project objective is the final engineering design, construction plans , and permits for the ATS . III . SCOPE Indian River County ( County) will utilize staff and subcontractors to design and permit the ATS . A ten million gallon per day duplex pumping station will be designed inside the South Relief Canal right-of- way . The pumps will be either above ground pumps enclosed inside a small -prefabricated building or submersible wastewater type pumps . The pumps will be capable of pumping solids up to three-inches in diameter . Preceding the pumps will be a Duperon self-cleaning F1exRake with one-inch openings . Thus , all solids one- inch and larger will be removed from the canal water prior to entering the pump station . The captured solids will be disposed of at the County landfill or an energy conversion facility . In addition , the overall project design will allow up to 1 . 5 million gallons per day of reject water to be pumped to PC South ' s ATS for treatment and dilution . The design of the RO water treatment pump Page 11