sentences:  It was found to have low dissolved oxygen levels and very high phosphate levels.The researcher of this project suggests that such contamination is from farms or lawns upstream which could be using soils with pesticides on them (which contain phosphates), and the phosphates will flow into Royce Brook during a rainstorm was runoff.High levels of phosphates have been documented as encouraging too many aquatic plants to grow, using dissolved oxygen from the water (limiting it to the fish), which could be the situation in Royce Brook.