Common nutrients in fertilizer include nitrogen, phosphorus, and potassium. Perched ground water Water in an isolated, saturated zone overlying a layer of material with low hydraulic conductivity and separated from the main body of ground water by unsaturated sediment or rock. Perched ground water has a perched water table. Phenols A class of organic compounds containing C 6 H 5 OH and its derivatives. Used to make resins, weed killers, and as a solvent, disinfectant, and chemical intermediate.
Some phenols occur naturally in the environment.
Phosphorus A nutrient essential for growth that can play a key role in stimulating aquatic growth in lakes and streams. Used as plasticizer in plastics. A source at a discrete location such as a discharge pipe, drainage ditch, tunnel, well, concentrated livestock operation, or floating craft. PCBs were used in transformers and capacitors for insulating purposes and in gas pipeline systems as a lubricant. Further sale for new use was banned by law in 1979.