I've briefly seen a website by an environmentalist group opposed to the NWP project, which argues in part against it due to the geologic instability of the region, particularly with respect to the Eel River canyon.

The purport of the article implies that aggregate interest[s] would be as ecologically irresponsible as the lumber industry [a grossly unfounded claim, notwithstanding]. No geologist I, but common sense would indicate that well-planned aggregate mining could actually ameliorate the potential for landslides/floods, et al..