Environmental Impact Assessment

What is EIA?

Environmental Impact Assessment (EIA) is a systematic process to identify, predict, evaluate and mitigate the likely environmental, social and other relevant effects of a proposed project before decisions are taken and commitments made.

Objectives

1. Integrate environmental considerations into project planning and decision-making.
2. Identify adverse impacts early and propose mitigation measures.
3. Examine alternatives — sites, technologies, designs, including the "no project" option.
4. Involve the public and affected communities.
5. Provide a basis for environmental management and monitoring during construction and operation.

Benefits

Avoids costly mistakes and later remedial expenditure; reduces environmental damage and conflicts; improves project design; ensures compliance with laws; promotes sustainable development and transparency.

Evolution

• USA — National Environmental Policy Act (NEPA), 1969 — first to require environmental impact statements for federal actions.
• India: environmental appraisal of river valley projects began in the late 1970s; the EIA Notification of 1994 under the Environment (Protection) Act, 1986 made environmental clearance mandatory for listed projects; it was replaced by the EIA Notification, 2006 (amended many times since). A draft EIA Notification, 2020 was published for comments.

EIA Notification, 2006

Categorisation of projects

Category B projects are treated as Category A if located (fully or partly) within specified distances of protected areas, critically polluted areas, eco-sensitive areas or inter-state/international boundaries (the general condition).

The schedule lists sectors such as mining, thermal power, river valley and hydroelectric projects, nuclear projects, industries (cement, metallurgical, chemical, refineries, pesticides, etc.), infrastructure (highways, ports, airports, industrial estates), and building and construction projects above specified thresholds.

Stages of environmental clearance (for new projects)

1. Screening — (Category B) deciding whether B1 or B2.
2. Scoping — the EAC/SEAC determines detailed and comprehensive Terms of Reference (ToR) for the EIA study (standard ToRs also exist for many sectors).
3. Public consultation — (a) public hearing at or near the project site conducted by the State Pollution Control Board, and (b) written responses from concerned persons; certain projects (e.g. B2, expansion of roads within limits, building projects, projects in notified industrial estates) are exempt.
4. Appraisal — detailed scrutiny of the final EIA/EMP report and public consultation outcomes by the EAC/SEAC, which recommends grant (with conditions) or rejection.

The regulatory authority then decides on Environmental Clearance (EC) with specific and general conditions. The notification prescribes time limits for scoping, appraisal and communication of decisions.

Post-clearance monitoring

• Project proponents submit half-yearly compliance reports on EC conditions.
• Regional offices of MoEFCC and SPCBs monitor compliance; violations can lead to penalties or revocation.
• EC is valid for a specified period within which construction/operations must begin; expansion or modernisation needs fresh or amended clearance.

The EIA process

1. Project description — objectives, location, layout, technology, raw materials, resource use, waste generation.
2. Baseline environmental status — existing conditions of the study area (typically a 10 km radius for many industrial projects) — generally based on primary data for one season other than monsoon plus secondary data.
3. Impact identification — which environmental components will be affected and how (direct, indirect, cumulative; short-term, long-term; reversible, irreversible; beneficial, adverse).
4. Impact prediction — magnitude and extent using models (air dispersion, noise propagation, water quality, groundwater, traffic), analogues and expert judgement.
5. Impact evaluation — significance of impacts against standards, carrying capacity and public concern.
6. Mitigation measures — avoid, minimise, rectify, reduce or compensate adverse impacts.
7. Analysis of alternatives — sites, technologies, "no project".
8. Environmental Management Plan (EMP) — mitigation actions, institutional set-up, budget, and environmental monitoring programme.
9. Risk assessment and disaster management plan — for hazardous industries.
10. Public consultation and documentation — the EIA report (Environmental Impact Statement) with an executive summary.
11. Decision-making and post-project monitoring and audit.

Environmental components studied