The mitigation measures defined by the environmental authority must be incorporated into the project's Executive Design, which is required for issuance of the Installation License. The design should detail the specifications needed to ensure the effectiveness of each structure, including, for example, dimensions, materials, lighting, installation elevation, surface treatment, spacing and georeferenced location (Figures 91 and 92).
Once the Executive Design has been approved, its implementation should also be followed by environmental specialists through field inspections, both to verify compliance with the approved specifications and to identify possible impacts during construction. Particular attention should be given to noise, dust, vegetation clearing, construction of access routes, soil compaction, erosion and sediment transport (CALTRANS 2009; TROMBULAK & FRISSELL 2000), the latter having potentially significant effects on aquatic biota. Inspections should also assess any modifications that may be necessary to ensure the effectiveness of the structure (IUELL et al. 2003).
 Figure 91. Location of a wildlife crossing and guiding fences in the Engineering Design for BR-386/RS. STE – Serviços Técnicos de Engenharia / DNIT – IBAMA Process No. 02001.007807/06-92. |
 Figure 92. Sketch showing wildlife-crossing specifications in the Engineering Design for BR-386/RS. STE – Serviços Técnicos de Engenharia / DNIT – IBAMA Process No. 02001.007807/06-92. |
Translation note: This English version was preliminarily translated using ChatGPT and has not yet undergone human review.