PCBs, Pollution, Toxicity, Reefs, Metals, Pesticides, Polychlorinated Biphenyls - analysis, Environmental Monitoring, Puerto Rico, Water Pollution, Chemical - statistics & numerical data, Chlordan, Bays, Polycyclic Aromatic Hydrocarbons - analysis, Geologic Sediments - chemistry, Metals - analysis, Water Pollutants, Chemical - analysis, Coral Reefs, Sediment...