B-2 – Area 2 - Assessment of Environmental Effects 79 Actual or Potential Effect Recommended Mitigation / Management Recommended Monitoring / Future Action Additional Measures Proposed by OGNZL Mark a road centreline over full length of road, in particular those sections with limited forward visibility i.e. at curves in the alignment; Design and construct curve seal widening where necessary to ensure the design vehicle is able to negotiate all curves within its lane; Upgrade the single lane bridge approaches in accordance with the Manual of Traffic Signs and Markings for single lane bridge approaches and controls (which will require some minor widening); Constructing a 6.0m wide sealed road extension between the end of the existing two-way section of the road and the proposed site access in accordance with the HDC Engineering Manual; and Constructing a turning head at the end of the existing two-lane section or at the proposed access location to allow the public to turn around. Dewatering and Ground Settlement Effects on ground settlement during construction of the Willows Access Tunnel. Update the existing Dewatering and Settlement Monitoring and Management Plan, which sets out how OGNZL manage and monitor effects of its activities on land settlement and the groundwater hydraulic regime. Updates will include additional settlement monitoring to reflect the proposed activities. The existing Dewatering and Settlement Monitoring Plan will be updated to capture additional groundwater level and surface tilt monitoring locations recommended in the Ground Settlement Implementation of the ‘we break, we pay’ property damage policy.
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