We are activating a boat / 2 cycle motor that has been in storage in a hot climate for several years without being started... The fuel tank is about 1/2 full of old gas/oil and the motor has been difficult if not almost impossible to start.. When connected to an auxilliary tank with new fuel.. no problem... QUESTION: Once we have drained the fuel tank of the old fuel, what is the LEGAL and SAFE (Environment) way to dispose of bad mixed oil/gas fuel (approx 6 gallons) in the state of California?