Nathan, start cleaning! lol Seriously though, if there is that much trash and iron, then it may be that the site hasn't been detected or very little. Check your detector manual or on-line for settings to find deep targets and slow your sweep speed if not already doing so. Go over the site multiple times going different directions and using different coils. If you have disappointing days, when you go home think about making some adjustments, then try again. Chances are if there are some good targets then a rusty old nails or some other ferrous will be nearby. Good luck!