Trying to save their watershed from pollution

The Englishes describe the attempts of a small town to protect its watershed. The excerpt is somewhat unclear. Charles describes a letter he got arguing that the transpark could have precluded a "trade-off for environmental issues," perhaps implying that the wealth the project brought to the area might have increased its clout with the government or its ability to pay for cleanup projects. The hog industry is responsible for the pollution, the Englishes think, and also was instrumental in the construction of a wealthy housing development, River Landing.