Fond du Lac fire and rescue crews are on stand-by following a gas leak near Mercury Marine in Fond du Lac. Division Chief of Fire Prevention Troy Haase says the leak is located in a gas main under the frontage road. “It’s a line that comes off of the (gas) main, it’s a private line, so Mercury is In the process of getting a private company to come in and dig up the area to get to the leak,” Haase told WFDL news.