COMHAIRLE CONTAE ÁTHA CLIATH THEAS
SOUTH DUBLIN COUNTY COUNCIL
MEETING OF CLONDALKIN AREA COMMITTEE
Wednesday, January 18, 2012
HEADED ITEM NO. 4
N7 (Naas Road) Filter Drain Rehabilitation Project
REPORT:
- An extensive study has been carried out by Halcrow Barry Consulting Engineers on behalf of South Dublin County Council and the National Roads Authority to investigate the performance of the surface water drainage on the N7 between Newlands Cross and the Rathcoole Interchange.
- The resulting report concluded that the filter drainage system has reached its design life and as a result the drains are operating below capacity.
- The recommendation in the report is that the existing drainage system should be retained rather than be replaced, and a full depth regeneration of the filter material be carried out on the central median, inbound and outbound verges between Newlands Cross and the Rathcoole Interchange.
- A contractor was appointed before Christmas 2011 and works are scheduled to commence on site on 24th January 2012. The contract is currently scheduled to conclude in May 2012.
- The work will be carried out at night from Tuesday night to Saturday night inclusive in order to minimise the disruption to traffic. All traffic management restrictions will be removed at the end of each night shift and traffic flow on the N7 will then revert to normal operation for the full daytime period until the commencement of the next night shift.
- The agreed working hours are 9pm to 6am on Tuesday to Thursday night inclusive, 9pm to 9am on Friday night and 9pm to 11am on Saturday night. There will be no works on Sunday or Monday.
- Works will only be operational on one side (either inbound or outbound) and one section of the N7 at a time.
- In order to carry out the works in compliance with current health and safety regulations, traffic management will require lane closures down to one lane only at certain times during the working hours agreed above.
- Details of traffic restrictions on this section of the N7 will be available on the South Dublin County Council website www.sdcc.ie. These will be updated regularly as the works locations change over the contract period.