The EIA Process

The EIA Process

The Impact Assessment was undertaken in accordance with a systematic process and international guidelines in the absence of Singapore guidance. As per Figure 1, the process commences from screening and scoping of possible impacts, and progresses through to the assessment of impacts, identification of feasible mitigation measures and development of a management plan for implementation during the Project’s construction and operation phases.

Figure 1 The EIA Process

  • As per the process shown in Figure 1, LTA, ERM and the Engineering Feasibility Consultant conducted iterative discussions and engaged with stakeholders throughout the EIA process, to determine a feasible Project design that avoided and reduced the impacts as much as possible.
  • Where there are limited baseline data or relevant standards / guidelines, professional judgments and the Precautionary Principle have been adopted for the impact assessment.

    "The Precautionary Principle is an environmental approach that recommends for anticipatory action to be taken, when an activity has the potential to cause harm and there is scientific uncertainty on the subject, including instances where there is a lack of available scientific information."
  • The Impact Significance of normal construction activities were assessed, before and after mitigation measures are implemented ie pre-and post-mitigation. The post-mitigation impacts, ie after additional mitigation measures are introduced beyond the embedded controls, are referred to as Residual impacts.
  • Unplanned events were also assessed for the construction phase. The likelihood of these unplanned events occurring was evaluated from a review of past rail project experience in Singapore. The EIA considered the impact of each unplanned event with and without likelihood.