DANVILLE, Va. -

Hundreds, possibly thousands of mussels and clams, and a few turtles have been found along the banks of the Dan River.

State and federal biologists don't know if it's related to the coal ash spill. What is known, these government groups are uncertain about the future.

"We will be out here for a while doing this. I wish I could give you a lot of concrete answers right now but this is going to take time for us to assess this," said Craig Giggleman, a Biologist with the U.S. Fish and Wildlife Service.

Wednesday morning Duke Energy, alongside several state and federal groups revisited the Dan River. Attempting to turn any speculations into facts.

"What we're looking at is the ecological impact to the release that happened last month," Giggleman said.

The head of the Virginia Department of Environmental Quality says clean up, including vacuuming, is starting in three months in Danville.

Any coal ash less than one inch in thickness, the head of the DEQ says will stay in the river, mainly because, he says, it will do more damage than good.

In Dan Daniel Park, environmentalists have found hundreds of mussels and clams, washed up on shore, sitting on a base of coal ash.

If the large number is related to the spill is a mystery.

"We don't know at this point. Is it possible? Sure. But at this point we can not say exclusively yes or no. Like I said that's the long term nature of what we'll be working on," Giggleman said.

Virginia biologists haven't found high levels of harsh chemicals in fish samples taken earlier this month.

At a meeting in Danville Tuesday night, the DEQ said it's using all resources to identify the damage on marine life.

"The goal of all of that is to make sure that we have quantified the ecological damage and the recreation damage so that we will then hold Duke Energy responsible for that," said David Paylor, the director of the DEQ.

Until there are more definite answers, the Virginia Department of Health is posting signs around the river warning people to avoid touching the coal ash and long term contact with the river.