Aug 14, 2003 — Twenty years ago, the federal government declared General Motors toxic waste dump by the St. Lawrence River a Superfund site. That designation made it a high priority for cleanup. But a stand-off between the company and the nearby St. Regis Mohawk Tribe has left small amounts of PCBs still seeping into the river. General Motors wants to contain and monitor the chemicals forever. The tribe wants GM to truck them away. This week, General Motors is digging up contaminated soil to convince the tribe that their solution works. As David Sommerstein reports, the sides are still far from agreement.