Activist Erin Brockovich hosted a town hall meeting here in Brevard on Saturday to help in the fight to investigate a possible cancer cluster around Satellite Beach. The mayor of Cocoa Beach asked pet owners not to let their dogs drink the well water at Lori Wilson Dog Park. That well is one of 12 around the area that have shown high levels of cancer causing agents. A lift station for Patrick Air Force Base, where the analysis suggests the contaminants are coming from, showed the highest concentration of all.