To require that when there is sufficient verifiable quantities of competitively priced Washington-produced biodiesel fuel available to meet 2% of Washington state's aggregate diesel motor fuel demand, all diesel motor fuels offered at retail sale in Washington must contain at least 2% biodiesel fuel by volume. When calculating whether there is sufficient verifiable quantities of competitively priced Washington-produced biodiesel fuel available to meet 2% of Washington state's aggregate diesel motor fuel demand, a producer's gallons of biodiesel will not be included unless it can be verified that a predominant portion of the feedstock used to produce the biodiesel was grown in Washington state.   Official Text and Analysis.