ecosystem health, which would be evident through large-scale changes in ecological indicators such as biomass or in the diversity of species that typically use eelgrass beds for foraging or nursery grounds.”

Wildlife and Wildlife Habitat: Benthic Fauna

“Minor: Impacts would be localized and slightly detectable, but would not affect the overall structure of any natural community.

Moderate: Impacts would be clearly detectable and could appreciably affect individuals or groups of species, communities, or natural processes.

Major: Impacts would be highly noticeable and would substantially influence natural resources, e.g., individuals or groups of species, communities, or natural processes.”

Wildlife and Wildlife Habitat: Fish

“Minor: Impacts would be localized and slightly detectable, but would not affect the overall structure of any natural community.

Moderate: Impacts would be clearly detectable and could appreciably affect individuals or groups of species, communities, or natural processes.

Major: Impacts would be highly noticeable and would substantially influence natural resources, e.g., individuals or groups of species, communities, or natural processes.”

Wildlife and Wildlife Habitat: Harbor Seals

“Minor: Impacts would be localized and slightly detectable, but would not affect the overall structure of any natural community.

Moderate: Impacts would be clearly detectable and could appreciably affect individuals or groups of species, communities, or natural processes.

Major: Impacts would be highly noticeable and would substantially influence natural resources, e.g., individuals or groups of species, communities, or natural processes.”

Wildlife and Wildlife Habitat: Birds

“Minor: Impacts would be localized and slightly detectable, but would not affect the overall structure of any natural community.

Moderate: Impacts would be clearly detectable and could appreciably affect individuals or groups of species, communities, or natural processes.

Major: Impacts would be highly noticeable and would substantially influence natural resources, e.g., individuals or groups of species, communities, or natural processes.”

Special-Status Species

“Minor: The action could result in a change to a population or individuals of a species or designated critical habitat.

Moderate: The action would result in some change to a population or individuals of a species or designated critical habitat.

Major: The action would result in a noticeable change to a population or individuals of a species or designated critical habitat.”

Coastal Flood Zones

“Minor: The action would take place within the floodplain or flood zone, but would not result in an increase in potential flood damage to other areas, or is exempt from NPS floodplain management guidelines.

Moderate: The action would take place within the floodplain or flood zone and would result in increased potential for flood damage to property or environmental contamination at the project site.

Major: The action would have a measurable impact on potential flood damage or environmental contamination to the site as well as adjacent and downstream properties.”



The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement