I have a burnt oil/gasoline smell coming from my kitchen faucet only on the cold setting. The smell isn't there in any other faucets throughout the home, and the smell goes away after about 3-5 seconds in a glass. The kitchen is one of 2 lines inside that skips the water softener as well as 2 outside. The other lines straight from the well do not have that smell. What should be my next step? Should I be worried?