BBM1: I wish they had a website, but if they do, I sure haven't been able to find it. Information about their past searches would be such good info to have. The only contact info I found was for DC, who runs it. It appears to be home contact info, so I shy away from using it. Perhaps LE is aware of where they've searched? They must be.
BBM2: In NJ, when there's a construction project of this scale, the DEP and Historic Preservation & Museum Commission put the construction project applicant through all kinds of hoops where excavation is concerned. At least one reason is that they consider these kinds of projects opportunities to find things of archeological significance, like evidence of prehistoric camp sites. There are procedures surrounding the early stages of excavation -- it's like an exploratory dig, run by state experts -- and if they find anything, the project can be slowed considerably because the goal of this "intervention" is to preserve any ancient remains or artifacts that are found. These kinds of things are also watched by university archeologists ... all waiting for the next big find.
I don't know how this is handled in New York. But we do often hear in the news about skeletal remains being found at construction sites so the possibility must be one someone's radar. While it's not a sure thing, I think there's a good chance that the disturbance of these 200 acres means SL's body was not there. This was only 15 years after SL's disappearance -- does anyone know what the level of decomposition would be after 15 years with an unprotected earthen burial? I am thinking the remains would be large and noticeable, but I don't actually know.
I think in most places, before construction commences on large projects, at least, they do hire archaeologist to do a "dig"; I would think that because of Staten Island's history as a home for Paleo Indians, and for Revolutionary War combatants, that they would have done so. The problem with these digs, though, is that the developers or builders hire companies who employ archaeologists who work toward the goal of not finding anything of historical significance (not university professors or other people who might be able to delay the work they want to do). I don't know if that means that they don't do an extensive dig, or if they carefully report the findings as insignificant. In any event, as Skeet said, it's a lot of area to search.
Does anyone know what the deal with the tunnels at that site is? What were they used for? There couldn't be anything to find within the tunnels, but I wonder if "Friends of Jennifer" used the tunnels as jumping off points, to search on either end?