Keltbray Remediation has developed an innovative remediation technique at Worthy Down near Winchester. Remediation has been working there since 2015 as part of its biggest contract for Skanska at the £280 million Wellesley development, which will provide a new training college for the Ministry of Defence.
To minimise environmental impact and cost, Keltbray has developed a remediation technique that reduces the need to export and import large volumes of material for this contract. This involves materials management of over 60,000 m³ of the excavated construction waste (enough to fill 500 double decker buses!), which is being beneficially reused in non-construction areas on site; below proposed sports playing fields.
By beneficially reusing the material, the impacted material remains on site, and will be used to help shape parts of the new development. Once the construction arisings have been engineered in place beneath the sports pitches, it is covered with clean chalk that will form the base for new sports playing fields.
Remediation Engineering Manager for Keltbray Remediation, Mark Pescodd, said: “We are using careful segregation plans for the material types on site so that potential contaminants can be managed effectively. The material is then stockpiled. However, we will have to rotate these seven to eight metre tall stockpiles which include up to 50,000 m³ of material from one end of the site to another so that the site can remain operational at all times.
“After we stumbled upon Roman remains on site in 2015, 11 Roman burials, artefacts and fossils have since been found, so we have continued to tread carefully and work closely with archaeologists and technical geologists to phase the work on ground that has not been broken for centuries.”
Keltbray Remediation has drawn on expertise from colleagues at Keltbray Environmental Solutions (KES) and Keltbray Plant, and work now commences on the second tranche of three works phases; involving around 100 people working in five site teams until 2020.
Keltbray Group is the UK’s leading specialist business, which offers engineering, construction, demolition, decommissioning, remediation, rail and environmental services. The company dates back to 1976, employs more than 1,500 people, and is a key player in developing and maintaining Britain’s built environment. Keltbray provides services to meet the needs of diverse and complex projects, and its well qualified people take pride in delivering projects safely and efficiently, on time and to budget, and with care for the environment and our communities. Keltbray has contributed to a range of high profile construction projects including The Shard, Queen Elizabeth Olympic Park Stadium, St Pancras International, Crossrail, Earls Court and Battersea Power Station.