Endangered Chinese white dolphins would be affected by underwater blasting due to construction work on Route 10. Secretary for Transport Nicholas Ng Wing-fui said measures were to be taken to keep the impact on the rare species to a minimum. In a reply to a question by engineering representative Raymond Ho Chung-tai, Mr Ng said the underwater blasting for constructing the Tsing Lung Bridge's foundation would have no major long-term impact on the habitat of the dolphins. Impact mitigation measures would be adopted, he said. These included: Minimising the amount of blasting required and the quantity of charges used; Placing the charges in the cores of rocks to minimise shock wave pressure; Generating an air bubble curtain to enclose the blasting area and reduce the area affected; Using observers and patrol boats to ensure there was no marine mammal activity within 500m of the site half an hour before blasting; Arranging, when possible, for the blasting to take place during spring or summer when there are fewer dolphins in the area; Alerting all vessel operators of the possible presence of marine mammals and of the need to comply with the rules of safe vessel operation around marine mammals. Mr Ng said similar measures were adopted when underwater blasting had taken place at Chek Lap Kok and they were considered effective.