IRC 104:1988 is the Indian Standard (IRC) for guidelines for environmental impact assessment of highway projects. IRC 104:1988 provides the methodology for Environmental Impact Assessment (EIA) and Environmental Management Plan (EMP) preparation for highway and road infrastructure projects in India. It addresses the environmental dimensions — air quality, water, noise, biodiversity, cultural heritage, and socio-economic impacts — that must be evaluated before project approval. EIA scope and requirements are governed by the EIA Notification 2006 and related regulations from Ministry of Environment, Forest and Climate Change (MoEFCC). IRC 104 operationalizes these for highway-sector projects specifically — monitoring locations, methodology, impact prediction tools, mitigation measures. Compliance is mandatory for Category A (> 100 km NH or expressway) and Category B (10-100 km) projects. Public consultation, forest clearance (compensation afforestation 1:1), CRZ clearance (if within 500 m of HTL), and biodiversity protection are key components. Amendment No. 1 (2019) added climate change impact assessment and greenhouse gas emissions tracking; Amendment No. 2 (2023) aligned provisions with the revised EIA Notification and added vehicle electrification considerations for emissions reduction.
Specifies the scope, methodology, and documentation requirements for Environmental Impact Assessment (EIA) and Environmental Management Plan (EMP) for highway and road infrastructure projects in India.
- Status
- Current
- Usage level
- Essential
- Domain
- Transportation / Environment — Environmental Engineering
- Type
- Guidelines
- Amendments
- Amendment No. 1 (2019) — climate change impact and GHG emissions assessment; Amendment No. 2 (2023) — alignment with revised EIA Notification, EV integration for emissions
Also on InfraLens for IRC 104
Practical Notes
! EIA report typically 300-600 pages for major highway project. Cost of preparation ₹25-80 lakh depending on project size. Rely on specialized environmental consultants accredited by NABET.
! Category A projects often face 12-24 month EIA clearance timeline due to MoEFCC queue. Plan project schedule with this in mind; don't promise commissioning dates contingent on clearance without buffer.
! Public consultation / hearing is common bottleneck — affected communities oppose land acquisition or oppose road alignment. Skillful stakeholder engagement saves months vs confrontational approach.
! Wildlife corridor mitigation: underpasses (culverts modified for wildlife passage) and overpasses increasingly required. Specific to Tiger Reserves, Elephant Corridors (Karnataka, Tamil Nadu, Assam). Add 5-15% to project cost.
! Tree compensation: 1:3 ratio (not 1:1) sometimes mandated for valuable/slow-growing species. Project budget must include tree planting and 5-year maintenance.
! Forest clearance Stage I vs Stage II: Stage I clears alignment; Stage II clears after project details finalized. Both take 6-18 months separately.
! CRZ clearance for coastal highways — lengthy process, multiple rejections possible if alignment crosses sensitive zones. Pre-screen alternative alignments avoid CRZ where feasible.
! Construction phase environmental control: dust suppression (water sprinkling 2-3 times/day on haul roads), noise attenuation (timing restrictions near schools/hospitals), erosion control (silt traps in streams).
! Operations phase: ambient noise at sensitive receivers (schools, hospitals, residences) often exceeds CPCB standards post-opening. Noise barriers costing ₹5-25 crore/km may be required retrofitting.
! Biodiversity offsets: instead of compensation afforestation, offset through habitat restoration elsewhere — emerging concept, allowed for specific projects with biodiversity action plan.
! Climate change impact (Amendment No. 1, 2019): projects in flood-prone areas now require 100-year flood analysis (up from 50-year); check design-flood assumptions against recent extreme events.
! GHG emissions accounting (Amendment No. 1): tally CO2 equivalent for construction (concrete, steel), operations (traffic), and lifecycle. Expressways typically 20-50 million tonnes CO2 over 30 years.
! EV integration (Amendment No. 2, 2023): new expressways must include EV charging infrastructure at rest areas, supporting MoEFCC push for transportation electrification.
! Hazardous waste from construction: bitumen drums, paint cans, solvent containers — proper disposal per Hazardous Waste Management Rules 2016. Contractor responsibility in contract.
! Noise monitoring post-commissioning: ideally 5-year operational noise survey at pre-construction receivers to verify impact predictions. Often budget-constrained and skipped.
! Public consultation record-keeping: written records of public hearings, responses to objections, incorporation of suggestions into EMP. Legal requirement; incomplete records lead to clearance rejection.
! Environmental monitoring institutionalization: project-specific Environmental Officer on site during construction. Independent Environmental Monitor post-commissioning (3-5 years).
! Green expressway initiatives: tree plantation on median and along ROW (1000-5000 trees per km), bioswales for drainage, solar panels on noise barriers — emerging best practice.
! Archaeological clearance: for projects near ASI-protected sites, ASI NOC required. Can add 6-12 months. Screen alignment against heritage maps.
! For PPP expressway projects, environmental clearance is concessionaire's responsibility; government provides in-principle approval (PIB). Delays in clearance can trigger termination penalties — risky for concessionaire.