Breaking new ground
The contaminated land market is about to receive a major boost from legislative and fiscal changes as well as the government inspired drive to use more brownfield sites for housebuilding. A major beneficiary will be Eco-Smart, the newly launched contaminated ground specialist which is part of the Roger Bullivant group, as Nick Barrett reports from a major Eco-Smart clean up site.
One of the most recent entrants to the contaminated ground remediation market,
Eco-Smart, has just completed its first major project, on the site of the former
Drakelow A and B power stations. Drakelow, on the banks of the River Trent near
Burton-on-Trent, was in its day the biggest power station complex in Europe.
Eco-Smart’s general manager, David Bower, explained: “We negotiated with
the Environment Agency on Powergen’s behalf, obtained a licence, designed a
solution, assembled plant and carried out the project. We found heavy metal
salts condensed in silts over the years of operation of the power station. Water
was being pumped out of the Trent and when it was held in the cooling ponds,
the heavy metals settled on the bottom. When the cooling ponds were drained
the silt was left behind.”
The site was some 100 acres, with about 23 acres involved in the contamination
issue. About 35,000 tonnes of material was contaminated, located in three distinct
areas and mostly spread on the surface, although contaminants were found as
deep as 5.5 metres below ground level. The remediation process involved solidification/stabilisation
with cementitious binders which were spread over the site and mixed with the
silt. The cementitious material introduced was up to five per cent of the total
volume of material. We first excavated the material to be treated and took it
to our treatment area on site and placed it in two stockpiles. One was left
to stand and dry out while the other had timber and hardcore screened out. Hardcore
was crushed and blended back into the silt while the timber went to landfill.
The material was then blended back in layers of 300mm. Rotovators were used
and the material was finally compacted. The site is now ready for redevelopment.
“All the investigations and analysis necessary for the project was carried
out in house,” says Bower, “It wasn’t a typical site, although it
was typical perhaps of cooling tower sites. The tonnages involved were much
bigger than have been treated before in the UK with a heavy metal stabilisation
technique. The alternative would have been to cart it all off to landfill, which
would have been prohibitively expensive and time consuming as well as environmentally
unsatisfactory. We are not of the simply ‘bung your problems in another hole
in the ground’ philosophy. We were off the site within three weeks, which is
a strong message to deliver to developers involved with sites like this.
Eco-Smart’s mobile plant licence means it can treat any wastes in soil, with
a few exceptions like acids which would be isolated and taken off site or a
treatment technology would be imported to deal with them on site. “Our
role is consultants and project managers,” says Bower, “so we are
happy to bring in other expertise as the project requires. We can design the
solution, negotiate with the relevant authorities and execute the project where
appropriate. We aim to be a one stop solution for property and land owners.
We take the risk away for developers. We understand the problems facing developers
because we have faced them ourselves.”
One stop shop
Eco-Smart forecasts an upsurge in contaminated land work as a result of the
implementation of the Contaminated Land Act from 1 September this year. In addition,
an increasing amount of brownfield sites will have to be made suitable for housebuilding.
“Solutions for contaminated sites are going to be in big demand, and developers
want the one-stop-shop service which we offer,” says Bower. “The government
has made 150 per cent tax relief available on the cost of treatment, which will
give another boost to demand. About 50 per cent of the UK market will be within
a few hours of our base in Burton and we aim to capture at least a five per
cent market share.”