Level of Effects. Negligible: No measurable impacts. Population-level effects are not detectable. Localized, short-term disturbance or habitat effect experienced during one season that is not anticipated to accumulate across multiple seasons. No population level impacts to reproductive success or recruitment are anticipated. Mitigation measures are implemented fully and effectively or are not necessary. Minor: Population-level effects are not detectable. Widespread annual or chronic disturbances or habitat effects not anticipated to accumulate across 1 year, or localized effects that are anticipated to persist for more than 1 year. Mitigation measures may be implemented on some, but not all, impacting activities, indicating that some adverse effects are avoidable. Unmitigatable or unavoidable adverse effects are short term and localized. Moderate: Disturbances could occur, but not on a scale resulting in population-level effects. Widespread annual or chronic disturbances or habitat effects could persist for more than one year and up to a decade. Widespread implementation of mitigation measures for similar activities may be effective in reducing the level of avoidable adverse effects. Unmitigatable or unavoidable adverse effects are short term and widespread, or long term and localized. Major Disturbances occur that result in measurable population-level effects. Widespread seasonal, chronic, or effects from subsequent seasons are cumulative and are likely to persist for more than 1 decade. Mitigation measures are implemented only for a small portion of similar impacting activities, but more widespread implementation for similar activities could be more effective in reducing the level of avoidable adverse effects. Unmitigatable or unavoidable adverse effects are widespread and long lasting.
Level of Effects. Negligible Emission rates would be less than 100 tons per year for VOCs and all pollutants regulated under the NAAQS, and, if applicable, the Alaska AAQS. Minor Emission rates would be equal to or greater than 100 tons per year for VOCs and all pollutants regulated under the NAAQS, and, if applicable, the Alaska AAQS. Moderate Project-related emissions cause pollutant concentrations of at least one pollutant to exceed one-half of the PSD maximum allowable increases; or Project-related emissions cause pollutant concentrations of at least one pollutant to exceed one-half of the NAAQS, and, if applicable, the Alaska AAQS; or Increases in emissions of NOX and VOC would result in the formation of ozone to a level that would be expected to exceed one-half the ozone NAAQS. Major Design concentrations of at least one pollutant would equal or exceed one-half the NAAQS, and, if applicable, one-half the Alaska AAQS; or Increases in emissions of NOX and VOC would result in the formation of ozone to a level that would be expected to equal or exceed the ozone NAAQS.
Level of Effects. Negligible: Temporary and localized impacts to water quality that do not cause an unreasonable degradation under 40 CFR 125.122. Minor: Long-term and/or widespread impacts to water quality that do not cause an “unreasonable degradation” under 40 CFR 125.122. Moderate: Impacts to water quality that exceed NPDES permit criteria or cause a temporary or localized “unreasonable degradation” under 40 CFR 125.122. Major: Impacts to water quality that cause long-term and widespread “unreasonable degradation” under 40 CFR 125.122.
Level of Effects. Negligible: No measurable impacts and no population-level effects. May cause brief behavioral reactions such as temporary avoidances of or deflections around an area. Localized, short-term disturbance or habitat effects experienced during one season are not anticipated to accumulate across multiple seasons. No mortality or detectable impacts to reproductive success or recruitment are anticipated. Mitigation measures are fully implemented or are not necessary. Minor: Low but measurable impacts with no population-level effects. A small number of mortalities are unlikely but possible. May cause behavioral reactions such as avoidances of or deflections around an area. Localized, disturbance or habitat effects experienced during one season may accumulate across subsequent seasons, but not over one year. Mitigation measures are fully implemented or are not necessary. Moderate: Mortalities or disturbances could occur, but no detectable population-level effects. A small number of mortalities are likely, but not to an extent resulting in detectable population level effects. Adverse impacts to ESA-listed species could occur. Widespread annual or chronic disturbances or habitat effects could persist for more than one year and up to a decade. Widespread implementation of mitigation measures for similar activities may be effective in reducing the level of avoidable adverse effects. Unmitigated or unavoidable adverse effects may be short term and widespread, or are long term and localized. Major: Mortalities or disturbances occur that have detectable population-level effects. For marine mammals, mortality might occur at or above the estimated Potential Biological Removal1 (PBR) as a result of the Noticed Activities. For fish and benthic invertebrates, the anticipated mortality is estimated or measured in terms of tens of thousands of individuals or >20% of a local breeding population and/or >5% of a regional population, which may produce population-level effects. Widespread seasonal or chronic effects are cumulative and are likely to persist for more than one decade. Mitigation measures are implemented only for a small portion of similar impacting activities, but more widespread implementation for similar activities could be more effective in reducing the level of avoidable adverse effects. Unmitigatable or unavoidable adverse effects are widespread and long lasting.
Level of Effects. Negligible: Periodic disruption of social organization, cultural values, and/or institutional arrangements occurs without displacement of existing social patterns. Minor: Disruption of social organization, cultural values, and/or institutional arrangement occurs for a period of less than one year, without a tendency toward displacement of existing social patterns. Moderate: Chronic disruption of social organization, cultural values, and/or institutional arrangements occurs for a period of more than one year, without a tendency toward displacement of existing social patterns. Major: Disruption of social organization, cultural values, and/or institutional arrangements with a tendency towards displacement of existing social patterns.
Level of Effects. Negligible: Subsistence resources could be periodically affected with no apparent effect on subsistence harvests. Minor: Adverse impacts to subsistence activities are of an accidental and/or incidental nature and limited to a short-term (within one season or the duration of the project). Moderate: Adverse impacts which disrupt subsistence activities, or make subsistence resources unavailable, undesirable for use, or only available in greatly reduced numbers, for a substantial portion of a subsistence season for any community. Major: Adverse impacts resulting in one or more important subsistence resources becoming unavailable, undesirable for use, or available only in greatly reduced numbers for any community.
Level of Effects. Negligible No measurable effects beyond short term, periodic impacts. Minor Adverse impacts to the affected activity or community are avoidable with proper mitigation. Impacts would not disrupt the normal or routine functions of the affected activity or community. Economic systems would be impacted for a period of up to 1 year. Once the impacting agent is eliminated, the affected activity or community will return to a condition with no measurable effects from the Noticed Activities without any mitigation. Moderate Impacts to the affected activity or community are unavoidable. Proper mitigation would reduce impacts substantially during the life of the project. Effects on economic systems would be unavoidable for a period longer than 1 year. The affected activity or community would have to adjust somewhat to account for disruptions due to impacts of the project. Once the impacting agent is eliminated, the affected activity or community will return to a condition with no measurable effects from the Noticed Activities if proper remedial action is taken. Major Impacts to affected community are unavoidable. Proper mitigation would reduce impacts somewhat during the life of the project. The affected activity or community would experience unavoidable disruptions to a degree beyond what is normal. Once the effect producing agent is eliminated, the affected activity or community may retain measurable effects of the Noticed Activities indefinitely, even if remedial action is taken.
Level of Effects. Negligible Infrequent minor acute health problems, not requiring medical attention. No measurable effects on normal or routine community functions. No long-term consequences for Public Health or well being. Minor Public Health affected, but the effects would not disrupt normal or routine community functions for more than one week. Effects would not occur frequently. Effects would not affect large numbers of individuals. Effects could be avoided with proper mitigation. Moderate Adverse effects on Public Health occurring for brief periods of time that do not result in or incrementally contribute to deaths or long-term disabilities. Effects can be prevented, minimized, or reversed with proper mitigation. Effects could occur more frequently than minor events, but would not be frequent. Major Effects on Public Health would be unavoidable and would contribute to the development of disabilities, chronic health problems, or deaths. Alternatively, occurrence of minor health problems with epidemic frequency. Effective mitigation might minimize the adverse health outcomes but would not be expected to reverse or eliminate the problem.
Level of Effects. The levels of effect for Environmental Justice correspond to the levels of effects for subsistence, sociocultural, or public health effects as experienced by minority populations or low income populations.
Level of Effects. Negligible This category equates to No Historic Properties Affected as defined by 36 CFR 800.4(d)(1), the Code of Federal Regulations that promulgates Section 106 of the National Historic Preservation Act of 1966 as amended. Minor This category equates to a finding of No Historic Properties Affected when the Agency identifies a potential conflict within an Area of Potential Effect due to the presence of a geomorphological feature and revises the plan to avoid it prior to consultation with the State Historic Preservation Officer.
