Bill, as a CA native I agree that 700K looks a bit low for a 500 acre duck club just off Interstate 80, half way between San Francisco and Sacramento.
http://www.californiaoutdoorproperti.../the-teal-club
There is another club a few miles away for sale, 2,500 acres for $7,000,000.
http://www.stromerrealty.com/listing...dge-duck-club2
I know that we have several CA members who are very knowledgeable in this area who also hunt waterfowl and perhaps they could bring some light on the matter-which, if there was some legal action, might get to a member list.
California just emerged from a five year drought, so there might have been a water issue or given this is CA, perhaps there was a deadline on a clean-up for lead shot. Just guessing.
Oh, and I notice what looks like a subdivision on the edge of the property in the real estate offering photos. A common occurrence in this state (and, I am sure others) is that sub-divisions get build next to hunting/shooting clubs and small airports and then the new residents, after a few years, petition to close those activities down.
Patrick Butler