Three distinct sewer diversions for Welsh Water, required to facilitate the construction of the A487 Caernarfon to Bontnewydd Bypass.
A487 Carnarfon to Bontnewydd Bypass
The A487 Caernarfon to Bontnewydd Bypass project was funded by the Welsh Government to improve journey times between key North Wales locations, including the Llyn Peninsula, Porthmadog, Bangor and the A55. The project also reduced noise and air pollution for people living along the A487, increased active travel options for local residents and reduced long queues at several hot spots along the route.
Griffith were employed by Dwr Cymru Welsh Water (DCWW) to complete 3no. sewer diversions that were required to facilitate the construction of the road scheme.
Two of the three sites were green field sites, remote from the main access points. Due to the underfoot conditions we installed ground protection measures to reduce damage and allow safe access for plants, equipment and staff.
One of the sites was located within a redundant road way, where floor sawing and breaking out of the hardstanding was required before the new trench could be excavated.
The sewers ranged in diameter, including 150mm, 225mm and 300mm piping, with both ductile iron and plastic pipe used as appropriate. The runs ranged in length between 73m and 170m, included appropriate chambers and access points. To aid long term planning and scheme resilience, at each location an additional redundant duct was added for future proofing.
The work was completed while the existing sewer was active. To facilitate the changeover process, Griffiths worked alongside DCWW to share with local residents the timings of any planned disruption. Collaborative planning and early stakeholder engagement allowed us to reduce this disruption to a minimum.
The majority of the work was completed via self-delivery from our directly employed staff using in house equipment, with the majority of the staff allocated to this project living within a 30-mile radius. Griffiths Regional Office in North Wales is located in Porthmadog and we are proud to provide both blue and white collar employment across the region, together with a number of apprentice opportunities.
