RPS was responsible for the planning, design and construction supervision of a major upgrade to the wastewater collection infrastructure in the town of Skibbereen, Co. Cork.
The River Ilen, an important fishery and tourism amenity which flows through the town centre, discharges into Roaringwater Bay, a Special Area of Conservation under the EU Habitats Directive.
RPS was responsible for all stages of the €20m project from preliminary engineering report to detailed design and the preparation of contract documents, statutory permissions (planning permission & foreshore licence), as well as wayleaves, procurement and administration of the construction contracts.
We also produced the Environmental Impact Statement for the proposed wastewater treatment plant. This new plant, constructed as part of a separate contract, has a current capacity of 4,700 persons with a planned ultimate capacity equivalent to 9,400 persons.
Civil, mechanical & electrical contracts included the construction of up to 20km of pipeline, varying from 225mm to 1200mm in diameter. The construction of four outlying pumping stations ensures that flows are delivered to the main pumping station, which is constructed adjacent to the town centre. A telemetry system based at the main pumping station allows the online monitoring of all pumping equipment. The combined storm and wastewater flows arriving at the main pumping station are balanced within a 900m3 stormwater storage tank. This controls flow passed forward for treatment to the new wastewater treatment plant.
During construction, the challenging ground conditions necessitated the use of both open-cut and trenchless (directional drilling, auger boring and microtunnelling) techniques for the construction of the pipelines. Deep chambers were constructed using caisson techniques, and where necessary, 20 - 30m long steel piles provide foundation to structures.