STOCKTON — The calm blue waters of McLeod Lake suddenly turned a bright yellow as an estimated 5,000 rubber ducks raced toward the finish line that was all for a good cause.Hundreds of young children and families soaked up a pleasantly warm Saturday afternoon for the fifth annual Public Safety Day and Ducky Derby at the Weber Point Events Center in downtown Stockton.The event was hosted by the Child Abuse Prevention Council and Stockton Police Youth Activities.