(a) An EA is a concise document with sufficient information and analysis to enable the Executive Director to determine whether to issue a FONSI or prepare an EIS.

(b) Commission actions that generally require an EA exhibit the following characteristics:

(1) Minor but likely insignificant degradation of environmental quality;

(2) Minor but likely insignificant cumulative impact on environmental quality; and

(3) Minor but likely insignificant impact on protected resources.

Commission actions that typically require preparation of an EA include without limitation:

(a) Approval of final plans for Federal public buildings in the District of Columbia, and the provisions for open space in and around the same, pursuant to 40 U.S.C. 8722(d) and D.C. Code 2-1004(c).

(b) Approval of final plans for District of Columbia public buildings and the open space around them within the Central Area pursuant to 40 U.S.C. 8722(e) and D.C. Code 2-1004(d).

(c) Recommendations to a Federal or District of Columbia agency on any master plan or master plan modification submitted to the Commission that include proposed future projects that require Commission approval pursuant to 40 U.S.C. 8722(d)-(e) and D.C. Code 2-1004(c)-(d) within a five-year timeframe.

(d) Approval of a final site and design for a commemorative work authorized under the Commemorative Works Act pursuant to 40 U.S.C. 8905.

(e) Approval of transfers of jurisdiction over properties within the District of Columbia owned by the United States or the District among or between Federal and District authorities, pursuant to 40 U.S.C. 8124,unless.12(a)(7).

An EA prepared by NCPC as the Lead Agency for a project requiring Commission approval shall comply with the following requirements:

(a) The EA shall include, without limitation, a brief discussion of the proposed action; the purpose and need for the proposed action; the environmental impacts of the proposed action; the environmental impacts of the alternatives considered; Mitigation measures, if necessary; and a list of agencies and persons consulted in preparation of the assessment.

(b) The NCPC shall involve to the extent practicable applicants; Federal and District of Columbia agencies; the public; and stakeholders in the preparation of an EA.

(c) The NCPC, at the sole discretion of the Executive Director, may undertake Public Scoping for an action requiring an EA. The Public Scoping shall generally commence after issuance of a public notice in a media source with widespread circulation and the NCPC Web site of NCPC's intent to prepare an EA. The notice shall include the date, time and location of the Public Scoping meeting.

(d) The NCPC may solicit public review and comment of a Draft EA. The public comment period generally shall be thirty (30) calendar days. The public comment period shall begin when the Executive Director announces the availability of the Draft EA on the NCPC Web site (www.ncpc.gov). The NCPC, at its sole discretion, may decline to circulate a draft EA for non-controversial projects.

(a) If NCPC is the Lead Agency and the final EA supports a FONSI, NCPC shall prepare and execute a FONSI. The FONSI shall be prepared following closure of the discretionary public comment period on a Draft EA, or if no public comment period is deemed necessary, at the conclusion of the preparation of an EA. The FONSI shall briefly state the reasons why the proposed action will not have a significant effect on the environment and include the EA or a summary thereof, any Mitigation commitments, and a schedule for implementing the Mitigation commitments. The FONSI shall be signed following the Commission final approval of the applicant's project.

(b) If NCPC is not the Lead Agency, it shall evaluate the adequacy of the Lead Agency's FONSI. If NCPC determines the FONSI to be adequate, NCPC shall proceed as follows. If consistent with the Federal Agency's NEPA regulations, NCPC may co-sign the Lead Agency's FONSI following the Commission final approval of the application. Alternatively, NCPC may prepare and execute its own FONSI consistent with the requirements of paragraph (a) of this section and sign the FONSI following the Commission's final approval of the project.

(c) In certain limited circumstances described in 40 CFR 1501.4(e)(2)(i) and (ii), a FONSI prepared by NCPC shall be available for public review for thirty (30) days before NCPC makes it final determination. NCPC shall also publish all FONSIs on its Web site seven (7) calendar days before the Commission takes action on the underlying application.

(d) If the Commission determines a Lead Agency's EA does not support a FONSI, either the Lead Agency shall prepare an EIS, or the Commission shall not approve or consider further the underlying application.

(a) The NCPC shall prepare a supplemental EA if five or more years have elapsed since adoption of the EA and:

(1) There are substantial changes to the proposed action that are relevant to environmental concerns; or

(2) There are significant new circumstances or information that are relevant to environmental concerns and have a bearing on the proposed action or its impacts.

(b) The NCPC may supplement a Draft or Final EA at any time to further the purposes of NEPA.

(c) The NCPC shall prepare, circulate, and file a supplement to a Draft or Final EA, and adopt a FONSI in accordance with the requirements of §§ 601.15 and 601.16. If NCPC is not the Lead Agency, it shall proceed as outlined in § 601.16(b) and (c).