South Dublin County Council has begun the Clonburris Stage 2A Joint Infrastructure Works – Surface Water Outfall in the Griffeen area. Emergency works are required to safeguard road users and the public as the programme advances.

Over the coming months, heavy civil engineering will deliver storm water attenuation areas and an upgraded storm outfall in the locations indicated on the project map. A key element involves a surface water road crossing on Griffeen Avenue.

Clonmel Enterprises, the main contractor, has completed risk assessments for all planned activity on Griffeen Avenue. Particular attention is being given to the safe management of around 600 pupils due to attend the new Griffeen Community College from 24 August. The highest-risk interface occurs during installation of the storm outfall where it crosses Griffeen Avenue, when heavy plant and materials will move across the school access road and navigate the roundabout to complete the crossing shown in the red boxed area on the map.

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To remove this risk ahead of schools reopening on 24 August, the project team will seek an emergency road closure and Clonmel Enterprises will accelerate the road crossing to minimise any interaction with pupils during school arrival and departure times.

Key proposal details are as follows: the works are scheduled to start on 12 August for five days, spanning the weekend. Griffeen Avenue will be closed between Grange Castle Road and Griffeen Road. The operation involves installing a deep storm water sewer across the existing carriageway using 1050mm diameter precast concrete pipes.

Traffic mitigation will include submission of Traffic Management Plans to SDCC for approval, the placement of Variable Messaging Signs in advance of the works, and a signed diversion via Castle Road and Griffeen Way. Road sweeping will take place as needed to keep entrance and exit points free of debris.