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Grand Canal Dredging, Dublin City Centre

Projects > Dredging Projects

GRAND CANAL DREDGING

Grand Canal, Dublin City
Centre

 L&M Keating were contracted by Waterways Ireland to dredge
5,500m3 of contaminated and non-contaminated deposits from
the Grand Canal in Dublin City Centre.

The site is extremely congested due to its location in City Centre,
adjacent to a busy Luas stop, crossing Luas lines and the South
Ring Road running along the South bank of the Canal. Access
was further limited by an on-going cycle path contract under
construction along the North bank of the canal. A traffic
management plan was designed and implemented to facilitate
Luas movements, Canal Navigation, pedestrian traffic, vehicular
traffic and construction traffic from both our own and
neighbouring contracts. The Traffic Management Plan was
agreed with An Garda Siochána, Dublin City Council, Waterways
Ireland and Veolia (Luas).

As the canal is a rich source of biodiversity including a world
endangered species of snail, the Myxas Glutinosa and the
Groenlandia Densa plant. The snail was present immediately
downstream of our site, requiring impeccably clear, unpolluted,
calm water. To protect these and other species, it was required
to defish and dewater the canal between locks. 24hr mechanical
pumping would have been obtrusive to neighbouring hotels and
residents as well as being environmentally insensitive. L&M
Keating instead proposed and implemented a syphon system
which required no pumping and ran continuously throughout the
project. In additional we installed silt screens and adjusted our
programming to use locks as settlement lagoons.

The above mentioned access restrictions meant that there was
no facility to excavate from nor store material on the banks. To
carry out the work we commissioned the construction of a 20t
amphibious swamp excavator complete with 18m long reach
boom. This low bearing pressure excavator allowed us to track
on the canal bed without damaging the clay liner. The material
was segregated on site of household waste and recyclables. The
spoil was then loaded directly into sealed tippers on the road
side. The material was then taken to a licenced waste facility
with chain of custody documentation as per our Waste
Management Plan.
Client Waterways Ireland
2 Sligo Road
Enniskillen
Co Fermanagh
BT74 7JY
Value €210,000
L&M Keating Ltd, Kilmihil, Co. Clare. www.lmkeating.ie | info@lmkeating.ie
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