nr 010b wpd 1 epa420 r 99 009 exhaust emission factors for nonroad engine modeling spark ignition report no february 24 1998 revised june 15 march 30 1999 megan beardsley christian e lindhjem and craig harvey us epa office of mobile sources assessment division purpose this describes documents used si engines in s inventory model it covers powered by gasoline natural gas liquefied petroleum expects to recalculate most prior release the final version that will be draft lists data considered when calculating new complete similarly documented distributed stakeholder review additional reports describe other issues relating including evaporative emissions crankcase spillage non 012 adjustments rates due variations fuel temperature 001 speciation hydrocarbon
