In December, the company agreed to reduce the size of the fills.
About four miles of streams would be buried, but Arch Coal never indicated how much rock and earth would be dumped.
But the new plan, negotiated by the U.S. Environmental Protection Agency, represented the first phase of a two-phase project. Eventually, the company wanted approval for the entire original project.
On Friday, Arch Coal lawyers unveiled a new plan. They provided the proposal to John Morgan, an engineer working for environmental groups, during a legal deposition.
Portions of the proposal filed in federal court indicate that, under the proposed revision, Arch Coal would dump about 62.6 million cubic yards of rock and earth into valley fills.
The documents do not say how many miles of streams would be buried.
It is also unclear from the court records whether the proposal represents the first phase of a two-phase permit, or the entire project as a whole.
If it is the first phase of a two-phase project, it would represent a valley fill-size reduction of about 10 percent from what EPA negotiated.
If, however, the new revision is for the entire project, it would cut the final size of valley fills in half.
Roger Wolfe, lead lawyer for Arch Coal, did not return a phone call seeking comment.
Included in the court filings was a draft letter submitting the revision to Larry Alt, permitting supervisor at the DEP Office of Mining and Reclamation in Logan.
The draft letter, dated June 30, was never sent to him, Alt said Wednesday.
To contact staff writer Ken Ward Jr., call 348-1702, or e-mail kw...@wvgazette.com.