(Portland, OR)  --  A public hearing on a proposal to add ten cents per gallon to the cost of gasoline in Portland is slated to be held tomorrow by the Portland City Council.  Commissioner Steve Novick is pushing for the tax in an effort to get the Council to add the item to the May 17th ballot.  Novick, who's in charge of the Portland Bureau of Transportation, says the revenue is needed to fund the city's road and street projects.