John Tedesco

The biggest single stimulus project scheduled to be built in Bexar County is a new highway interchange between traffic-clogged Loop 1604 and U.S. 281 on San Antonio’s far North Side. The project is estimated to cost $130 million, with $80 million coming from federal stimulus funds that must be spent by 2015.

But the site sits on the environmentally sensitive Edwards Aquifer recharge zone, the primary source of San Antonio’s drinking supply — and the source of San Antonio’s fiercest debates about pollution from urban sprawl tainting the aquifer.

Here’s a time line of events leading up to a lawsuit filed Wednesday by Aquifer Guardians in Urban Areas that could jeopardize the project. The lawsuit accuses transportation agencies of failing to protect the Edwards Aquifer.

In a way, it’s history repeating itself. The highway intersection was the site of one of the very first controversies involving the aquifer, when developers in the 1970s wanted to build a “super mall” near the location that sparked a petition and referendum by concerned residents who tried to halt the development.

All these years later, the dust hasn’t settled.