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It is logical and necessary for the biological health of the Kenai River to use only four-stroke or DFI (direct fuel injection) engines and eventually exclude two-stroke engines. However, if one reviews carefully the revised "Oasis Study" of April 26, 2007, that evaluates the TAH (total aromatic hydrocarbons) load from 35 horsepower and 50 horsepower four-stroke engines, it becomes apparent that there will be more TAH placed in the Kenai River with the horsepower increase.
http://www.peninsulaclarion.com/stories/071307/letters_2936.shtml