Heads of the Valley A465 Section 3

Client:Costain
Discharge Point:Surface Watercourse

Background

The existing A465 was built in the 1960s and is a single three lane carriageway with two lanes in the Tuphill direction and one in the downhill direction. A regional traffic study in 1990 identified the need to improve this road. This improvement to the A465 is critical to the social and economic regeneration of the Heads of the Valleys area.

The width of the road restricts traffic flow and opportunities for safe overtaking. In many areas there is poor visibility. Accidents on this stretch are concentrated around junctions and areas with poor visibility.

This improvement to the A465 is critical to the social and economic regeneration of the Heads of the Valleys area. It will improve access to key services, jobs and markets supporting inward investment to areas such as the Ebbw Vale Enterprise Zone.

Total project costs circa £220m

The Overall Objective

Due to the excavation work carried out, surface water run off picked up slow settling solids leading to the need for chemical treatment.

This phase was particularly challenging due to the steep sided valley limiting access and available space. The pH levels of the water in a nearby lagoon could increase due to concrete work being carried out nearby.

Solution

Siltbuster installed a 3 stage Chemical Dosing System with pH adjustment onsite at short notice to ensure slow settling solids could be treated and captured in the mobile lamella clarifier and automatically neutralise the highly alkaline water.

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