Companies 36 & 37 were dispatched IFO 41 South Union ave for the unk yellow liquid in the street. Fire company was on scene for approx 3 hrs. Crews dyked up the storm sewers to prevent the liquid from entering the sytem. With the mixture of the rain water and the yellow liquid, the hazmat team recovered approx 700 gallons. The yellow liquid was determined to be something used in the mixture of paint.