My only suggestion would to carefully read your townships master plan. Find all the ways that this proposed development is a poor fit for the master plan (preserving farming, nature, avoiding negative impacts on ground water table, stream quality (septic fields), road traffic concerns, etc. You can generate a list of very real impacts that are negative for the township quality of life, and put their own master plan's document's words in their own faces as proof of what should guide them. They'll likely use some word salad to talk around your concerns, but if a room full of 100+ people is angry enough, they have to at least listen.