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333056MGM Metropolitan St. Louis Sewer District 2350 Market Street St. Louis, MO 63103-2555 (314) 768-6200 January 29, 2009 Mike Stavropoulos, P.E. CrystalStream Technologies 2090 Sugarloaf Parkway, suite 135 Lawrenceville, GA 30045 RE: Extension of provisional approval for the Hydrodynamic Separation and Pollution Screener for Pretreatment Dear Mr. Stavropoulos, This letter is to advise you that the District has granted a one year extension of the provisional approval for the Hydrodynamic Separation and Pollution Screener for Pretreatment. Please submit a set of sample calculations that demonstrates how your product will be incorporated with a sand filter BMP and also a set on how it will be incorporated with a wet pond BMP. Details of the final approval may be based upon these calculations. Although the District has not approved your product as a stand-alone BMP we will consider it on a site -by -site basis. This extension is granted for a period of one (1) year from the date of this letter. If you have any questions, please call me at (314) 768-6332. Sincerely, Eue J?'hnson, P.E. Civil Engineer pc: Mike Buechter, P.E.