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are not as land intensive . Many of the more compact systems are adaptations of domestic and industrial wastewater treatment components . These active systems , which often include electrical or mechanical components , have come to be known as "structural" pollution control devices ( PCDs ) . They have a higher operation and maintenance requirement than passive systems. In light of extremely high construction and energy costs together with the knowledge of the tremendous pollution caused to the Indian River Lagoon by the Main Relief Canal , Indian River County is designing a stormwater treatment system that is simple , easy to construct, easy to operate , easy to maintain , requires minimal power cost, and provides substantial pollutant removal capability. This system is referred to herein as the bar screen system and it will use two sets of six self-cleaning bar screens in series to remove solids from the canal . The developers of this system are in the process of applying for a U . S . patent for the system. It will also incorporate a simple sedimentation basin upstream of the bar screens to collect soil particles that are transported along the canal bottom by storm flows . The collected sediment will be removed from the sedimentation basin sump by two horizontal shaft belt-driven centrifugal trash pumps . The design is unique because it consists of bar screens in series rather than using only a single set. Installations using only a single set of bar screens are in operation in the South Florida Water Management District (SFWMD) and other locations in Florida and nationwide. IRC staff visited several SFWMD installations and attests to the efficient and simplistic operation of these bar screening systems . In the IRC system , canal water will be diverted into an off-line treatment channel that will contain the bar screening system . The first set of bar screens will have one-inch openings and will remove all particles one-inch in diameter or larger. The removed solids will be deposited by the self-cleaning screens onto a conveyor that will dump them into a waste collection container for ultimate disposal in the IRC landfill . The first set of bar screens will be followed by a second set having 1 /8-inch openings. The second set of self-cleaning bar screens will also deposit its solids onto a conveyor that dumps into another waste collection container. The system has the following attributes : • Horsepower Requirements - Horsepower requirements are minimal . There will be 12 self-cleaning bar screens, each with a 1 /8 Hp motor. There will be two 3 Hp conveyors and two 5 Hp sedimentation removal system pumps. Therefore, the total required horsepower is 17. 5 Hp . Normally, only the bar screens and conveyors will be operating , representing a total 7. 5 Hp . System operating personnel will manually operate one 5 Hp sediment pump at a time for short periods. • Simplicity of Design — The self-cleaning bar screens have proven themselves to be simple and effcient. SFWMD has operated some for over 7 years, 24 hours per day, 7 days per week with no downtime due to equipment failure . The design 's most complicated piece of equipment is the conveyor system and it is easily accessible and easy to repair. The aboveground sediment removal pumps will be located so they are also easily accessible . The bar screen system controls will be the simplest possible . Controls are as follows: ( 1 ) The sediment removal pumps will be manually operated with an "on-off' switch ; (2) The self-cleaning bar screens will be in operation 24 hours per day, 7 days per week. Each screen will have an "on-off' switch together with standard built-in safety controls. If a large object jams a screen , the screen will DEP Agreement No. G0182, Attachment A- 1 , Page 3 of 12