On Tuesday, Aug. 9 at 6 p.m., San Diego Coastkeeper and the Environmental Health Coalition will host “Signs of the Tide: San Diego Bay’s Dirty Little Secret,” a free panel discussion on the origin of contaminated material lurking beneath the water in the San Diego Bay, its effect on marine and human life and the 10-year history of delayed cleanup efforts. In a 1996 study, the National Oceanic and Atmospheric Administration (NOAA) found San Diego Bay to be the second most toxic bay in the nation. Pollutants such as copper, mercury, PAHs, PCBs, zinc and chlordane are dense in the sediment, contaminating fish and resulting in serious health risks to consumers. An environmental leader will discuss the scope of a proposed project by the Regional Water Quality Control Board to clean up the toxic material from a 60-acre site on the bay’s floor and a San Diego Coastkeeper staff member will propose ways for volunteers to get involved in the cleanup efforts. “Signs of the Tide” will take place at the Memorial Recreation Center, located at 2902 Marcy Ave. For more information or to get involved, call (619) 758-7743 or visit www.sdcoastkeeper.org.