The following words and terms, when used in this subchapter, have the following meanings, unless the context clearly indicates otherwise.

1. (1) Assessment unit--For a water body in the state, the smallest geographic area of use support analyzed for such body in Texas Commission on Environmental Quality's most recent integrated report prepared under the Clean Water Act §305(b) that includes a Clean Water Act §303(d) list that has been approved by the U.S. Environmental Protection Agency. An assessment unit is based on the primary segment assessment unit identified in the integrated report.
2. (2) Construction--Activities that involve the building of transportation projects on new location; or the expansion, rehabilitation, or reconstruction, of an existing facility.
3. (3) EPA--The United States Environmental Protection Agency.
4. (4) Environmental report--A report, form, checklist, or other documentation analyzing an environmental issue in the context of a specific transportation project or presenting a thorough summary of an environmental study conducted in support of an environmental review document, or demonstrating compliance with a specific environmental requirement. The term does not include a permit or other approval outside the scope of the environmental review process.
5. (5) Environmental review document--An environmental assessment, a draft environmental impact statement, a final environmental impact statement, a reevaluation as described in §2.85 of this chapter (relating to Reevaluations), or a supplemental environmental impact statement as described in §2.86 of this chapter (relating to Supplemental Environmental Impact Statements), or a document prepared to demonstrate that an Federal Highway Administration (FHWA) transportation project qualifies as a categorical exclusion when FHWA requires a narrative document as opposed to a checklist. An environmental review document includes any attached environmental reports.
6. (6) Federal Clean Air Act (FCAA)--The federal statute, including all amendments, that establishes National Ambient Air Quality Standards (NAAQS) and mandates procedures for reaching and maintaining these standards, codified at 42 United States Code §§7401, et seq.
7. (7) FHWA transportation project--A transportation project for which the approval of the United States Department of Transportation Federal Highway Administration (FHWA) is required by law to comply with the National Environmental Policy Act, codified at 42 United States Code §§4321, et seq. and implementing regulations (NEPA), FHWA is the lead federal agency, and FHWA agrees Texas Department of Transportation may act as the joint lead agency under 23 Code of Federal Regulations §771.109.
8. (8) Impaired assessment unit--An assessment unit that does not support or meet water quality standards established by the Texas Commission on Environmental Quality (TCEQ) as shown in TCEQ's most recent integrated report prepared under the Clean Water Act §305(b) that includes a Clean Water Act §303(d) list that has been approved by EPA. An assessment unit identified in the integrated report as impaired due to nonsupport of a water quality standard that is not caused by a pollutant (identified as category 4c) will not be considered an impaired assessment unit for the purposes of this MOU.
9. (9) Maintain or maintenance--Activities which involve the upkeep or preservation of an existing facility to prevent that facility's degradation to an unsafe or irreparable state, or which involve the treatment of an existing facility or its environs to meet acceptable standards of operation or aesthetic quality. The activities generally do not require the acquisition of additional right of way or result in increased roadway capacity.
10. (10) Maintenance area--A geographic area previously designated as a non-attainment area and subsequently redesignated to attainment subject to the requirement to develop a maintenance plan under 42 United States Code §7505a of the FCAA, and other areas designated as maintenance areas by the EPA.
11. (11) Non-attainment area--A geographic area designated nonattainment by the EPA as failing to meet the NAAQS for a pollutant for which a standard exists. The EPA designates counties (or portions thereof) as nonattainment under the provisions of 42 United States Code §7407(d). For the official list and boundaries of nonattainment areas, see 40 Code of Federal Regulations Part 81 and relevant notices in the Federal Register.
12. (12) State Implementation Plan (SIP)--The plan prepared by the TCEQ under 42 United States Code §7410 of the FCAA to attain, maintain, implement, or enforce NAAQS. An approved SIP is the implementation plan, or most recent revision of this plan, that has been approved by EPA under 42 United States Code §7410 of the FCAA.
13. (13) TCEQ--Texas Commission on Environmental Quality.
14. (14) TxDOT--Texas Department of Transportation.
15. (15) Total Maximum Daily Load (TMDL)--The total amount of a substance that a water body can assimilate and still meet the Texas Surface Water Quality Standards as adopted by the TCEQ for a particular water body.
16. (16) TMDL Implementation Plan (I-Plan)--A plan describing the strategy and activities TCEQ and watershed partners will carry out to improve water quality in the affected watershed.
17. (17) Transportation enhancement--An activity that is listed under 23 United States Code §101(a)(29), that relates to a transportation project, and is eligible for federal funding under 23 United States Code §133.
18. (18) Transportation project--A project to construct, maintain, or improve a highway, rest area, toll facility, aviation facility, public transportation facility, rail facility, ferry, or ferry landing. A transportation enhancement is also a transportation project.

Source Note:The provisions of this §2.303 adopted to be effective May 16, 2013, 38 TexReg 2859.