LESSON 3.3 — Environmental Impact Assessment

A. Standard Map

B. Mechanism in Words

1. A proposed project — a dam, highway, industrial plant, or township — will change the environment around it; some changes are acceptable, others cause irreversible damage.
2. EIA asks, before construction begins: what will change, by how much, and can we prevent or reduce the harm?
3. The project proponent commissions a study (conducted by an accredited consultant) that documents the existing environment (baseline), predicts what the project will do to it, and proposes ways to avoid or reduce harm.
4. The regulator reviews the study, consults the public, and decides whether to grant clearance — with conditions — or refuse.
5. Once clearance is granted, monitoring during construction and operation verifies that the conditions are being met.
6. Strategic Environmental Assessment (SEA) extends this logic upward — from individual projects to plans, programmes, and policies — recognising that project-level EIA cannot catch cumulative impacts from multiple projects in a region.

C. Core Concept Explanations

C1. EIA — Definition, Purpose, and Legal Basis

Definition: Environmental Impact Assessment is a systematic, anticipatory process for evaluating the potential environmental consequences of a proposed project, plan, or programme before a decision is made to proceed, so that identified adverse effects can be avoided, minimised, or mitigated.

Indian legal framework:

C2. Category A and B Projects

Sub-categories within B:

C3. Nine Stages of the EIA Process

The EIA process in India per the 2006 Notification proceeds through nine sequential stages:

C4. Mitigation Hierarchy

When adverse impacts are identified, the response follows a strict preference order:

1. AVOID
   Do not do it. Redesign project, change location, or abandon the activity.
   Most effective: eliminates the impact entirely.

2. MINIMISE
   Reduce scale or intensity so impact is smaller.
   Examples: reduced footprint, best available technology, changed operational hours.

3. REHABILITATE
   Restore the affected environment after the impact occurs.
   Examples: land restoration, revegetation, aquifer recharge.

4. COMPENSATE (Offset)
   Where damage is unavoidable, compensate elsewhere — biodiversity offset,
   habitat creation in another location, payment to an offset fund.
   Least preferred: the original site still loses value.

C5. Environmental Impact Statement (EIS) — Three Parts

The EIS (also called the EIA report) has a mandated three-part structure:

C6. Strategic Environmental Assessment (SEA) vs EIA

C7. Expert Appraisal Committee (EAC) and SEAC

D. Design/Parameter Table

E. Common Confusions

F. Exam Traps

G. Answer-Writing Cues

For EIA definition:

For mitigation hierarchy:

H. PYQ Linkage Note

I. Mini-Check — Lesson 3.3 (5 Questions)

Q1 (MCQ): The EIA Notification that mandates environmental clearance for scheduled projects in India was issued in:
(A) 1986 (B) 2000 (C) 2006 (D) 2020

A1: (C) 2006. The Environmental Protection Act = 1986 (enabling legislation). The EIA Notification specifying procedures and project schedules = 2006 (S.O. 1533, MoEFCC). The 2020 draft notification proposed amendments but was not fully enacted.

Q2 (MCQ): Under EIA Notification 2006, a large thermal power plant exceeding 500 MW requires environmental clearance from:
(A) SEIAA — State Environment Impact Assessment Authority (B) MoEFCC — Ministry of Environment, Forest and Climate Change (C) CPCB — Central Pollution Control Board (D) District-level Environmental Committee

A2: (B) MoEFCC. Large-scale, high-impact, or trans-boundary projects are Category A and require clearance from the Central Government (MoEFCC), appraised by the Expert Appraisal Committee (EAC). State authority (SEIAA) handles Category B.

Q3 (MCQ): In the EIA mitigation hierarchy, which response is the most preferred?
(A) Compensate through biodiversity offsets (B) Minimise the impact’s scale through engineering controls (C) Rehabilitate the affected site after construction (D) Avoid the impact entirely through project redesign or relocation

A3: (D) Avoid. The hierarchy is Avoid → Minimise → Rehabilitate → Compensate. Avoidance eliminates the impact entirely and is always the first and most preferred response.

Q4 (MSQ): Which of the following are correct statements about the EIA process in India? Select all that apply.
(A) EIA must be completed before the decision to proceed with a project is made
(B) Strategic Environmental Assessment (SEA) is legally mandatory in India under a 2006 notification
(C) Public consultation is a mandatory stage in the EIA process
(D) Category B2 projects require a full EIA study
(E) The Expert Appraisal Committee recommends but does not issue the Environmental Clearance

A4: (A), (C), and (E).
– (A) ✓ EIA is a preventive, pre-decision process.
– (B) ✗ SEA is recommended by NEP 2006 but is NOT legally mandated in India.
– (C) ✓ Public consultation is mandatory under EIA Notification 2006.
– (D) ✗ Category B2 projects do NOT require a full EIA — only an environmental management review.
– (E) ✓ EAC recommends; MoEFCC issues the Environmental Clearance for Category A.

Q5 (MCQ): An Environmental Impact Statement (EIS) is structured into how many parts under the EIA Notification 2006 framework?
(A) Two (B) Three (C) Four (D) Five

A5: (B) Three. Part I = project description and alternatives; Part II = assessment, mitigation, and environmental management plan; Part III = non-technical summary for public and decision-makers.