Value: £243,779

Client: Lang O'Rouke

Start Date: September 2019 

Finish Date: October 2019 

 

Following the implementation of new legislation for wastewater treatment plants, we were approached by Crewe WwTW to carry out work to improve their leak containment and prevent contamination of the ground so that they meet the new industry standards. We were tasked with installing beany kerbs (ACO kerbdrains) to ease the drainage of surface water, as well as drainage and drainage repair works to prevent leaks. We carried out concrete reinforcing and forming through the construction of an apron around a holding tank, designed to contain a sudden burst. 

Our most challenging aspect of the project was working within a live wastewater treatment plant where we were subject to working under different systems. This required us to follow site-specific health and safety measures, which resulted in daily site meetings each morning so that everyone's position and role within the plant was clarified. As a visual representation of this process, we used a map of Crewe WwTW with magnetic tags to mark everyone's location on site to track and monitor our workforce and provide peace of mind for our client.  Due to high levels of methane in holding tanks, we were working on a strict non-smoking site to remove the risk of a tank explosion.  We were educated on the dangers of falling into one of the settling tanks located on site, and how the consequences were lethal. Platforms surrounding these areas were strictly prohibited and we kept our site completely separate through erecting the appropriate fencing. 

We had limited access for deliveries to the site itself as the only entrance was a coded gate, which required further coordination whereby we had delivery drivers call an allocated phone number to enter.  One of our workmen would meet them at the gate, provide a quick site induction and help them exit swiftly so not to disrupt the plant.  The works themselves presented a series of technical challenges that we had to overcome, such as breaking a concrete slab around a holding tank.  Taking extra precaution, we sawed small blocks to break out by hand to avoid hitting the holding tank with disruptive breakers.

We delivered the main body of works on programme and on the budget of £130k with a quality that left our client impressed.  Following the success of overcoming the pure technical challenge of the works, we were offered additional works that amounted to 50% of the original programme requiring the construction 3 precise large pads of concrete with reinforcing in efforts to isolate tanks, a series of wear pads for a hillside pipeline and trial digs for the installation limpet chambers as part of their recirculating system.  We concluded works within the revised programme and budget, and both parties were mutually satisfied with the final results.