Agenda - Council - 12/14/2010 - Laserfiche WebLink

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2.03 Device Testing and Analysis 2.04 Performance protect ecoStorm Page 3 of 4 The following minimum testing standards are critical to ensure proper design and function of the stormwater treatment system: • Testing was performed using a full scale unit to minimize scaling error. • Testing, data analysis, and development of the performance function was performed by an independent 3 party. • Removal efficiencies were determined by using a sediment mass balance approach to ensure accurate measurement. No automated samplers or grab samples were utilized to determine device removal efficiency. • Water temperature was recorded during testing and water viscosity is accounted for in the device performance function. • Testing was performed with several wholly independent particle sizes or particle size distributions (able to be separated by sieving) to promote repeatability of tests and development of an accurate performance function applicable to a wide range of particle sizes. • Each test must be repeated a minimum of three times with all input values constant (e.g. flow rate, temp., influent sediment concentration, etc.). Test repeatability must be sufficiently accurate as to result in a greater than 95% confidence of the final performance function when including all testing data points. • A performance function must be created using the testing data and provide for scaling of the treatment unit; allowing for design variability of the unit dimensions, flow rate, and sediment gradation at a minimum. • Testing must be performed to determine not only the device removal efficiency, but also the devices ability to retain previously captured material. The device(s) shall meet and utilize the testing and analysis requirements listed in Section 2.03 above to meet the following treatment targets (default treatment targets are based on the ecoStorm design guidelines): • 80% TSS removal • Particle size of 110 microns • Flow rate generated during a 1" storm event The device must also be capable of conveying the peak flow, as defined by the engineer, with negligible hydraulic impacts to the upstream storm sewer system and minimal washout of previously captured material. 2.05 Manufacturer The structural stormwater treatment system shall be the ecoStorm® Stormwater Treatment System as manufactured by Royal Environmental Systems of Stacy, Minnesota, or an authorized manufacturer approved by Royal Environmental Systems to produce the ecoStorm Stormwater Treatment System. TODAY by building forTOMORROW www.royalenterprises.net • 651- 462 -2130 • 800 - 817 -3240 3.09