Sewerage work

Galway County Council

Title attributed to the contract by the contracting authority: Clifden Sewerage Scheme Upgrade Stage 1: Clifden Waste Water Treatment Plant. Clifden sewerage scheme upgrade Stage 1 - Clifden waste water treatment plant is a design, build, operate and maintain (DBO) contract. This contract is for the design, construction, commissioning and operation of the Clifden wastewater treatment plant. The operation period of the DBO contract is 20 years. The contract will include the transport of thickened or dewatered sludge from the WWTP to a sludge satellite centre. The existing Clifden WWTP provides primary treatment and discharges settled sewage into the estuary of the Owenglin River in the inner Clifden Bay. Clifden has a current population of approximately 2,200 and is serviced by a combined stormwater/sewage drainage network. As the existing sewerage infrastructure has insufficient capacity to cater for the current and projected populations and the current level of treatment is inadequate, Galway County Council have proposed a two stage upgrade to the Clifden sewerage scheme. This contract is for the Stage 1 WWTP, which will be designed for a population equivalent of 4,975 P.E. In order to comply with the current Urban Waste Water Treatment Regulations effluent quality parameters of 25 mg/l BOD5 and 35 mg/l SS or better are required. Based on the shellfish water quality requirements in Clifden Bay and hydrographic modelling, a Faecal Coliform (FC) limit of 10,000 No./100ml is also likely to be required in the final effluent. It is likely that a sludge dewatering plant will be included at the treatment plant in order to reduce sludge haulage costs. The decision on whether to include a sludge dewatering plant in the scope of works will be made subject to a life cost analysis. This contract will include the construction of an inlet pump station, the wastewater treatment plant, and a new marine outfall into the estuary of the Owenglin River to replace the existing short outfall. Additional modules will be added to the treatment plant as part the Stage 2 upgrade, which will increase the plant capacity to 9,470 PE. Stage 2 works are expected to be implemented in five years’ time and will be separate to this Contract.

The time limit for receipt of tenders was 2008-10-28. The procurement was published on 2008-09-19.

• • Galway County Council

• • Sewer construction work › Sewerage work
• • Sewer construction work › Water-treatment work › Wastewater pumping station
• • Sewage-treatment plant construction work › Water-treatment plant construction work › Wastewater treatment plant construction work
• • Repair and maintenance of plant › Wastewater-plant repair and maintenance work
• • Engineering design services › Engineering design services for mechanical and electrical installations for buildings

• • Éire/Ireland