It is difficult to give exact numbers until after the deed is done.  The
Exxon Valdez oil spill is a good example.  Before it occurred the impact
was purely speculation.   After the spill we know now that some areas
(wildlife) may never recover -- while others have had very little long term
impact.

The report does say: "Information gathered from the biological, seismic and
geological studies was used to complete a Legislative Environmental Impact
Statement (LEIS) that described the potential impacts of oil and gas
development. This LEIS included the Secretary's final report and
recommendation, and was submitted to Congress in 1987. The report concluded
that oil development and production in the 1002 Area would have major
effects on the Porcupine Caribou herd and muskoxen. Major effects were
defined as "widespread, long-term change in habitat availability or quality
which would likely modify natural abundance or distribution of species."
Moderate effects were expected for wolves, wolverine, polar bears, snow
geese, seabirds and shorebirds, arctic grayling and coastal fish. Major
restrictions on subsistence activities by Kaktovik residents would also be
expected. "

If you want the actual numbers you would need to request a copy of the 1987
LEIS.

I think we all should read the wildlife web pages before they are also
recalled and their "credibility" confirmed.