Dr Tillmanns & Partner provides advice on and services in soil and groundwater contamination, rehabilitation planning and monitoring, landfill technology and planning, subsoil investigations, geothermics, hydrogeology and soil mechanics. In addition to undertaking fieldwork, Dr Tillmanns & Partner has an accredited in-house earthworks laboratory. With a staff of more than 20 geologists, mineralogists, geographers and other scientific professionals, it is one of the largest private companies of its kind in North Rhine-Westphalia.

The company will continue to be led by managing directors Bernd Braun and Ottmar Sistenich, along with RSK's Michael Schubert and Nigel Board, who will join the company board as managing directors. The company will join RSK Alenco, RSK's existing German business, within its European division.

"I'm really pleased to see this acquisition," said Dr Alan Ryder, RSK's founder and CEO, "which I hope will be the first of several as we invest in our European businesses and expand in Europe over the next few years. Dr Tillmanns & Partner is a great business with a very strong site investigation offer, which will help to strengthen and diversify our existing business in Germany. Dr Tillmanns & Partner has a well-earned reputation and long-established relationships with its clients."

Dr Wolfgang Tillmanns, said: "I am very happy that the company has been passed into the trustful hands of RSK. RSK, a growing, privately owned geoenvironmental group, will give Dr Tillmanns & Partner new opportunities for growth. The company managing directors Bernd Braun and Ottmar Sistenich are looking forward to working collaboratively with RSK Alenco and the rest of the group and are excited to be part of RSK's growth in Germany."