Newlands Cross Upgrade EIS - European Investment Bank

South Dublin County Council N7 Newlands Cross Upgrade
Environmental Impact Statement
Arup Consulting Engineers
• Concrete (including waste and wash-down water) will be contained and managed
appropriately to prevent pollution of all watercourses.
• Foul drainage from all site offices and construction facilities will be contained and
disposed of in an appropriate manner to prevent pollution of watercourses in accordance
with the relevant statutory regulations.
• Adequate protection measures will be put in place to ensure that all hydrocarbons used
during the construction phase are appropriately handled, stored and disposed of in
accordance with recognised standards as outlined by the EPA.
• Routine monitoring of water quality will be carried out by the Contractor at appropriate
locations in the following watercourses during construction: Ballymount Park and Camac
River. Parameters to be monitored by the Contractor will include pH, total suspended
solids, BOD and COD. In addition, biological monitoring (Q value assessment) will be
carried out where feasible
• The quality of surface water discharge from the site will meet water quality targets to be
agreed in consultation with South Dublin County Council prior to the commencement of
works.
• Protection is not required for riparian vegetation as no construction works will take place
on the watercourse.
14.5.2 Operational Phase
14.5.2.1 Culverts and Bridges
There are no culverts or drainage related bridges located within the boundaries of the
Newlands Cross scheme.
14.5.2.2 Carriageway Drainage and Outfalls
It is proposed to utilise the existing drainage outfalls post construction where practical. As
outlined in Section 14.4, the outfall peak flows will be increased post construction due to
increased impermeable road surfaces; therefore flow regulation is required to prevent over
capacity of receiving watercourses. This will be provided by means of oversizing drainage
pipes and using flow regulating devices (such as HydroBrake or equivalent) where the
proposed drainage outfalls.
There will be no use of herbicides, pesticides or artificial fertilisers in any landscaping or
subsequent maintenance within 2m of a watercourse. Applications of herbicides or pesticides
will be in accordance with manufacturers recommendations and confined to periods when the
vegetation is not wet from rainfall or dew within a zone of 10m from any watercourse.
14.6 Residual Impacts
14.6.1 Ballymount Park and the Camac River
There will be no significant residual impact on Ballymount Park surface water system and
subsequently the Camac River arising from the upgrading of the Newlands Cross Junction.
14.6.2 Dodder River
There will be no significant residual impact on the Dodder River arising from the upgrading
of the Newlands Cross Junction.
December 2007 Page 232