Environmental Impact Statement

---
name: environmental-impact-statement
description: Drafts NEPA-compliant Environmental Impact Statements (EIS) under 42 U.S.C. § 4321 and CEQ regulations (40 C.F.R. Parts 1500–1508). Covers purpose and need, alternatives analysis, affected environment, environmental consequences, mitigation, and public involvement. Use when preparing federal EIS documents, NEPA compliance analyses, or environmental impact assessments for proposed federal actions.
---

# Environmental Impact Statement (EIS)

Drafts a NEPA-compliant EIS analyzing environmental consequences of a proposed federal action across all required resource categories and alternatives.

## Prerequisites

Gather before drafting:

1. **Project identification** — title, lead agency, cooperating agencies, NEPA coordinator
2. **Proposed action** — location, timing, phases, scale, legal authority, required permits
3. **Purpose and need** — underlying problem, regulatory/policy mandates driving action
4. **Alternatives** — all considered alternatives, including those screened out with reasons
5. **Baseline data** — environmental inventories (physical, biological, cultural, socioeconomic)
6. **Consultation records** — scoping comments, agency/tribal letters, Section 106/Section 7 docs
7. **Jurisdiction** — US federal; identify agency-specific NEPA implementing procedures

## Quick Start

1. Confirm project scope, lead agency, and decision to be made
2. Draft purpose and need — specific enough to bound alternatives without predetermining outcome
3. Develop alternatives array including no-action (forward-looking, per 40 C.F.R. § 1502.14)
4. Catalog affected environment by resource category
5. Analyze consequences (direct/indirect/cumulative) per resource × alternative
6. Specify enforceable mitigation measures with monitoring
7. Document all consultation and public involvement
8. Compile list of preparers with expertise and sections

## Document Structure

### 1. Project Overview

Table with: project title, lead agency + NEPA coordinator, cooperating agencies and roles, statutory authority, and specific decision to be made.

### 2. Purpose and Need

- State the problem or opportunity requiring federal action
- Cite legal/policy mandates
- Scope must bound reasonable alternatives without predetermining outcome

### 3. Alternatives Analysis

Required alternatives:

| Alternative | Requirements |
|---|---|
| No Action | Forward-looking future conditions under current management — not just present state |
| Proposed Action | Full description: location, phases, methods, ancillary facilities |
| Additional alternatives | Different location/technology/scale — must represent genuine range |
| Eliminated alternatives | Brief description + dismissal rationale (infeasibility, outside jurisdiction, fails purpose) |

### 4. Affected Environment

Organize by resource category — include only detail needed to understand conditions and trends:

- **Physical** — geology, topography, soils, minerals, paleontological resources
- **Water** — surface hydrology, groundwater, water quality, floodplains, wetlands, Wild & Scenic Rivers
- **Air** — attainment status, applicable SIP requirements
- **Biological** — vegetation, wildlife habitat, listed species, critical habitat, essential fish habitat, corridors
- **Cultural** — archaeological sites, historic structures, TCPs, NRHP properties, tribal significance areas
- **Human environment** — land use, demographics, EJ communities, recreation, visual resources, noise, transportation, treaty rights

### 5. Environmental Consequences

For each resource category × each alternative, analyze:

- **Direct** — same time and place as action
- **Indirect** — later/farther but reasonably foreseeable
- **Cumulative** — incremental contribution combined with past, present, and foreseeable future actions

Per-resource checklist:

- [ ] Intensity, duration, geographic extent
- [ ] Short-term vs. long-term; temporary vs. permanent
- [ ] Beneficial and adverse effects
- [ ] Irreversible/irretrievable resource commitments
- [ ] Significance criteria and rationale for determinations
- [ ] Scientific uncertainty or incomplete information (40 C.F.R. § 1502.22)
- [ ] Conflicts with federal/state/local plans or regulations

### 6. Cumulative Impacts

- Define geographic and temporal scope with rationale
- Identify contributing past, present, and foreseeable future actions
- Assess whether combined effects exceed resource capacity or significance thresholds
- Address resource condition trends (improving, stable, or degrading)

### 7. Mitigation Measures

Per resource category, specify for each measure:

- **Description** — specific and enforceable
- **Type** — avoid / minimize / rectify / reduce / compensate
- **Applicable alternatives**
- **Implementation** — responsible party, timing, method
- **Monitoring** — verification approach, adaptive management triggers
- **Residual impact** — what remains after mitigation and why further mitigation is infeasible

Distinguish agency-authority measures from those requiring voluntary third-party action.

### 8. Consultation and Coordination

- **Public involvement** — scoping, meetings, comment periods; how input shaped analysis
- **Draft EIS comments** — substantive comments and Final EIS responses
- **Tribal consultation** — government-to-government process, traditional knowledge, treaty rights
- **Section 106 (NHPA)** — status and findings
- **Section 7 (ESA)** — biological assessment/opinion status
- **Other coordination** — state/local agencies, other federal consultations

### 9. List of Preparers

Table with name, affiliation, expertise, and sections responsible.

## Pitfalls and Checks

- **Hard look standard** — analysis must reflect rigorous consideration; avoid conclusory statements unsupported by evidence
- **Alternatives rigging** — courts scrutinize whether alternatives represent a genuine range vs. predetermined outcome
- **No-action baseline** — must project future conditions, not merely describe current state
- **CEQ regulation versions** — 40 C.F.R. Parts 1500–1508 were revised in 2020 and 2024; confirm which version applies based on project initiation date
- **Significance factors** — address both context and intensity per 40 C.F.R. § 1508.27 (verify current section after CEQ revisions)
- **EJ analysis** — required under E.O. 12898; identify disproportionate impacts on low-income and minority communities
- **Plain language** — accessible to non-technical public; define terms; use active voice (40 C.F.R. § 1502.8)
- **Source documentation** — cite all scientific literature, regulatory standards, and monitoring data; unsupported assertions are litigation targets
- **Tables and figures** — use for spatial, quantitative, or comparative information to improve clarity