Glossary

Description
Immediate Corrective Action (ICA)
An internal NCDOT notification to contractors or NCDOT crews to immediately correct potential violations to the Sediment and Erosion Control Act or to the Clean Water Act, to avoid a formal Notice of Violation (NOV) from a regulatory agency.
Implementation Guidelines
Refers to the Memorandum of Understanding (MOU) and Section 404/NEPA Merger Process Information document dated April 25, 2005, by the primary signatory agencies. Implementation Guidelines for Conflict or Dispute Resolution are addressed in Appendix B of this document and are defined under "elevation process".
Improve Existing
(Widen Existing) This option involves improvements to the existing roadway, as an alternative to a road on new location.
Indirect and Cumulative Effect (ICE) Analysis
CEQ Regulations require FHWA and other federal agencies to address and consider indirect and cumulative effects in the NEPA and decision-making process. The ICE Analysis uses appropriate methods to evaluate the potential for indirect and cumulative effects from a proposed project. The methods use a variety of factors such as zoning, land use plans, demographics, traffic models, growth and development trends, other likely infrastructure, and other information sources to provide an assessment of the foreseeable indirect and cumulative effects of a proposed project on a qualitative basis. NCDOT uses interchangeably with Indirect and Cumulative Impact. NCDOT will normally use Indirect and Cumulative Effect in the Merger Process. Other agencies such as DWQ may require more detailed information in an ICI analysis.
Indirect and Cumulative Impact (ICI) Analysis
See Indirect and Cumulative Effects Analysis
Indirect Effects
Effects caused by the action and are later in time or further removed in distance, but are still reasonably foreseeable. Indirect effects may include growth inducing effects and other effects related to induced changes in the pattern of land use, population density or growth rate, and related effects on air and water and other natural systems, including ecosystems (40 CFR 1508.8). NCDOT uses this term interchangeably with Indirect Impacts. However, NCDOT will normally use Indirect Effects in the Merger Process.
Individual Permit (IP)
DA authorization that is issued following a case-by-case evaluation of a specific project in accordance with the procedures of the applicable regulation and 33 CFR Part 325, and a determination that the proposed structure or work is in the public interest pursuant to 33 CFR Part 320. (33 CFR 322)
Infiltration Basin
A shallow impoundment that is designed to infiltrate stormwater into the soil. Infiltration basins are believed to have a high pollutant removal efficiency, and can also help recharge the groundwater, thus restoring low flows to stream systems.
Inlet
The end of a culvert where flow enters the culvert. Also used to describe drainage structures that collect surface water runoff as part of the storm drainage system.
In-lieu Fee Mitigation
Stream, buffer, or wetland mitigation in which a regulatory agency collects fees in lieu of requiring a developer to compensate for losses through onsite mitigation or acquiring credits generated by a mitigation bank. The fees are accumulated for use in future mitigation projects (or banking programs) by the agency or by a designated resource agency. (Institute of Water Resources, National Wetlands Mitigation Banking (WMB) Study Reports 94-WMB-2, 94-WMB-6;)
Interagency Agreement (IAG)
A general term used to denote a form of legal contract between two government organizations. As a Federal contract instrument, an interagency agreement is different from a MOUs or MOAs in that there is typically monetary considerations for agreed to services in an IAG.
Intermittent Stream
A stream that contains water for only part of the year, typically during winter and spring in North Carolina, when the aquatic bed is below the water table; flow occurs in a well-defined channel; groundwater is the primary source of water, but the flow may be heavily supplemented by stormwater runoff; often lacking the biological and hydrological characteristics commonly associated with the continuous conveyance of water.
Intermodal
Interconnectivity between various types (modes) of transportation
Intermodal Surface Transportation Efficiency Act (ISTEA)
See Glossary of Environmental Laws
Invasive (Nuisance) Species
Species of plants that detract from or interfere with a mitigation project, such as most exotic species and those indigenous species whose populations proliferate to abnormal proportions. (Lewis, R. R. Wetlands Restoration/Creation/Enhancement Terminology: Suggestions for Standardization, 1989)
Isolated Wetland
A wetland that is not adjacent to, or does not have a surface water connection to, navigable waters, tributaries to navigable waters, or non-isolated wetlands; unless it has a clear nexus (link) to interstate commerce, it is not normally regulated by the USACE under Section 404; however, it can be regulated by NCDWQ.
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