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Just over two years <a href=" http://www.diabeticcareassociates.com/penegra-when-to-take.pdf#lord ">penegra and sperm count</a> The Tier II system came under scrutiny after the explosion of a fertilizer plant in West, Texas, in April. Minutes after firefighters arrived, 40 tons of ammonium nitrate exploded, killing 11 first responders. Though federal officials say a Tier II report was on file at the fire department, surviving firefighters told Reuters they had never seen a report detailing what chemicals were stored at the factory. Had they known, they may well have stayed outside the blast zone.