Follow-up of a road building scheme in a fragile environment.

Serra do Mar, in Southeastern Brazil, is an extremely diverse and rich environment characterized by intense rainfall and steep slopes covered by tropical rainforest. A number of roads, highways, railways, pipelines, and transmission lines cross this zone. A new highway that has been approved by the Sa˜o Paulo State environment authorities is currently under construction.During the approval phase, the issue of ensuring proper implementation of mitigation measures arose as a significant concern. As a consequence, an innovative institutional arrangement has been set up for following-up, by which a multi-institutional multidisciplinary team performs weekly inspection tours, whereas the project owner hired its own consultant to oversee the construction, putting the contractor under strict scrutiny. Among the most significant issues addressed, the following are particularly relevant: (1) erosion and sediment yield; (2) river siltation; (3) slope stability; (4) excavated soil and rock disposal; (5) management of water pumped from tunneling; and (6) minimizing habitat loss.Results show that strict environmental supervision can effectively ensure that environmental impacts can be maintained within the limits of predicted impacts or legal requirements. Furthermore, this case showed that careful review of environmental impact studies and the establishment of detailed terms and conditions to be fulfilled by the proponent during the construction phase are necessary conditions for a successful follow-up. [Copyright &y& Elsevier]