Dublin City Council is to conduct a major marine site investigation works in Dublin Bay to provide a detailed understanding of the sub-seabed. The works will assist the Council in determining the feasibility of constructing a tunnel to extend the existing effluent outfall to a point approximately 10 kilometres eastwards in Dublin Bay.
To assist in the final decision regarding the technical feasibility and overall viability of extending the existing efluent outfall in the Bay, it is necessary to obtain a detailed understanding of the following in the Bay area; Sea Bed Bathymetry, Sea Bed characteristics, Sub-seabed sedimentology and underlying bedrock geology (rock types, faults, folds, structures, characteristics etc.). The full tender notice is here.
Foilsithe ag: Dublin City Council
Dáta Foilsithe: 05/05/2010
Spriocdháta Iarratais:
Spriocdháta Tairisceana: 09/06/2010
Spriocam Tairisceana: 15:00
Cineál Fógra: Cuireadh chun Tairisceana
Doiciméid Ann: Ní hea
Achoimre: In 2008 Dublin City Council appointed CDM (Ireland) as Consultants to progress the Ringsend Wastewater Treatment Works Extension Project. These Consultants, on behalf of Dublin City Council, have commenced an Environmental Impact Assessment (EIA) for the project.
CDM (Ireland) are examining a number of extension options. Pending the completion of the Environmental Impact Assessment (EIA), it appears that retaining the existing treatment systems on the Ringsend site, combined with a sea outfall discharge, would be the most beneficial option for increasing the capacity of the Ringsend Wastewater Treatment Works. This will involve the construction of an alternative discharge point approximately 10 kilometres offshore due east of Dublin, which will meet with discharge standards from the existing Works and from the proposed extension.
Dublin City Council requires to undertake major marine site investigation works in Dublin Bay to provide a detailed understanding of the sub-seabed characteristics. These works will assist Dublin City Council in determining the feasibility of constructing a tunnel to extend the existing effluent outfall to a point approximately 10 kilometres eastwards in Dublin Bay. To assist in the final decision regarding the technical feasibility and overall viability of extending the existing efluent outfall in the Bay, it is necessary to obtain a detailed understanding of the following in the Bay area; Sea Bed Bathymetry, Sea Bed characteristics, Sub-seabed sedimentology and underlying bedrock geology (rock types, faults, folds, structures, characteristics etc.). It is planned to undertake a detailed site investigation contract to gather geophysical and drilling information. In broad terms the overall survey length for bathymetric/ geophysical techniques is 850 kilometres. Appropriate levels of local geophysical surveys (seismic/ sonar/ electrical/ other) will be undertaken. Approximately 23 No. boreholes of depths varying up to 110 metres will be drilled. 19 of the boreholes will be located in Dublin Bay marine waters at water depths ranging from 0 metres up to 30 metres. The remaining 4 boreholes will be drilled at onshore locations in the Ringsend Peninsula Area close to the existing Ringsend Wastewater Treatment Plant.