Remediation of the Kesslergrube Landfill in Germany: Bauer Umwelt starts regular Excavations

The remediation project on the former site of the Kesslergrube landfill (perimeter 1/3 northwest) began in late summer 2015. Roche Pharma AG commissioned Bauer Resources GmbH and Bauer Umwelt, which specializes in contamination remediation, to carry out the work. After the large diameter boreholes for the installation of a secant bored pile wall had been concluded by Bauer Spezialtiefbau GmbH last year and the air-tight, sound-insulated enclosure was completed at the beginning of October, the time had come: the regular excavations started after a short trial operation in December 2017. These are scheduled to be concluded by 2020.

The excavations in the closure will be carried out in stages. After the northern construction site has been fully excavated, the excavation base in this area will be intensively sampled and after analytical confirmation that the target values have been reached (as much of the source of the impact has been removed as possible) refilled with clean soil material (e.g. from Rhein extraction site or quarry). As soon as the first construction phase has been renovated and refilled, the ventilation systems in the northern construction site will be relocated, meaning the southern zone can be renovated as the second section. Finally, the central zone will be renovated after the airlocks have been relocated.

The data gained on the basis of raster samplings allow an optimal control of the excavation logistics and quantity. On the basis of the data, it was possible to split up the entire excavation zone into around 1,800 excavation quadrants (each 100 cubic meters) with specific contaminant declarations. This makes it possible to excavate each quadrant, load it into gas-tight and accident-proof special transport containers, eject it and – depending on the contaminant composition – take it to the respectively suitable soil treatment plant in Germany or the Netherlands.

The excavation within the enclosure takes place conventionally using excavators and an intermediate level. If the excavator reaches the intermediate level, it is fully excavated. After that the excavation will proceed further to the intended end depths of around 8 to 14 meters. For this purpose, two excavators and two wheel loaders with the support of four mobile conveyor belts are used.

All work within the enclosure is carried out under protection level 2. This protection level contains an independent respiratory air supply. Therefore, all machines used within the remediation hall in the black area are equipped with a compressed air system for respiratory air supply of the driver. The time during which the employees carry out manual activities is reduced to a minimum and they wear protective suits and respiratory protection equipment. "The enclosure also ensures that no surface water comes into contact with the old waste deposits. A multistage groundwater filtering system treats the contaminated groundwater and directs it in a controlled manner into the adjoining Rhein", Jochen Kaspar, project manager of the general contractor Bauer Resources GmbH, explains.

The logistics concept drawn up by Bauer for the renovation excavations prescribes that the majority of the special transport container is driven two kilometers up the Rhein by boat to the port terminal in Auhafen, Switzerland. Here, the containers are loaded onto the rail and taken away for thermal disposal. A smaller part of the containers is driven down the Rhein into the Weil container terminal 9 kilometers away on the Rhein. From here, the transport takes place initially by truck and then on by rail to the prescribed disposal plants.

History of the Kesslergrube landfill site

The Kesslergrube landfill is made up of several former gravel pits in the Grenzach district of the Grenzach-Wyhlen community, which were created and operated between 1913 and 1969. From the 1950s until 1976 it was refilled with soil excavation, building rubble, household waste, industrial trash and waste from the chemical and pharmaceutical industry. The pits were backfilled by local industrial companies, refuse collection companies and the site municipality.

The former Kesslergrube landfill has been under intensive examination by various engineering offices since 1991. All examinations were carried out in close coordination with the environmental department of the Loerrach district administration. In order to exclude long-term environmental hazards, the Loerrach district office determined in July 2011 on the basis of the assessment of the commission for the assessment of contaminated sites for the German state of Baden-Württemberg that the pit was in need of rehabilitation.

The groundwater below the pit is contaminated with industrial materials. Extensive and detailed examinations confirm that no danger has originated or is currently originating from the former Kesslergrube landfill for humans or the environment, particularly for the drinking water catchment areas in the area surrounding the landfill site.

For the latest information on the remediation progress on the 1/3 NW perimeter: here

Source: Bauer Group


Bauer Group commissioned to expand the World’s biggest constructed Wetland Treatment Plant in Oman


In October 2017 the Bauer Group was awarded the contract to expand the world’s biggest industrial constructed wetland in the Sultanate of Oman on behalf of Petroleum Development Oman (PDO), the leading oil and gas exploration and production company in the country. The plant's first stage was completed in 2011 by the local subsidiary of Bauer Resources GmbH (Bauer Nimr LLC). The flagship project for treating contaminated water from oil extraction in the Sultanate of Oman in Nimr has won numerous international awards for excellence in sustainability, innovation and safety.


Bauer Indonesia executes Foundation Works for 266-meter Skyscraper in Jakarta


Jakarta is the largest city in Southeast Asia with around ten million inhabitants. The impressive skyline of the Indonesian capital will soon have one more distinctive building – the Japanese company Mori Building is currently constructing a new 59-story high-rise, including four basement floors, in the "Golden Triangle", right in the center of Jakarta. In addition to offices, the 226-meter building will also feature restaurants and cafés. The main contractors of the Jakarta office tower project are Shimizu Corporation from Japan and Bangun Cipta Kontraktor from Indonesia. Completion of the high-rise is scheduled for 2021, while the foundation work has been underway since May 2017, with which the local subsidiary of Bauer Spezialtiefbau GmbH, P.T. Bauer Pratama Indonesia, has been contracted.


Bauer AG has a significant Revenue Increase in the first Half of 2017

  • Total Group revenues increased by 21.1% to EUR 916.4 million; sales revenues grew by 27.8% to EUR 830.2 million
  • EBIT increased by 39.7% to EUR 25.7 million (previous year: EUR 18.4 million); earnings after tax are already positive at EUR 0.1 million (previous year: EUR -7.9 million)
  • Order backlog with EUR 1,044.7 million (previous year: EUR 1,010.2 million) still at a high level.
  • Forecast for total Group revenues raised from about EUR 1.7 billion to about EUR 1.8 billion.

Bauer Foundations Australia constructs Foundation for Resort Hotel in Sydney Harbor


Yet another distinctive building will soon adorn the skyline of the largest city in Australia: The new Crown Sydney Hotel Resort, the first six-star hotel in Sydney, is currently being built in the Barangaroo South district. With 69 floors (including mezzanines) and a height of 275 m, the hotel will be the tallest habitable building in the city. It will have 350 rooms, suites and luxury apartments, as well as restaurants, bars, luxury boutiques and conference rooms. Bauer Foundations Australia Pty Ltd and joint venture partner Piling Contractors execute the foundation work, which was commissioned by Crown Sydney Property Pty Limited, in August 2016.


"Schrobenhausener Tage" Symposium on Renovation Projects, technical Innovations and changing Values


The "Schrobenhausener Tage" symposium was a complete success once again. Approximately 250 customers, partners and friends of the company accepted the invitation of Bauer Spezialtiefbau GmbH to attend the traditional "Schrobenhausener Tage" event in Schrobenhausen in mid-May. Dr. Tilo Klinner, director of foreign trade at Germany's Foreign Office, was among the guests. This year was the first time that attendees, who had traveled from all over Germany, were welcomed by Arnulf Christa, the new Managing Director of Bauer Spezialtiefbau GmbH. In keeping with a long-standing tradition, Walter Haus, member of the Management Board and head of the domestic business unit at Bauer Spezialtiefbau, hosted the event.


Bauer Maschinen received Thousands of Visitors at the CONEXPO-CON/AGG Trade Fair

Conexpo-Con/AGG is the most important construction machinery trade show in North America. This year, over 130,000 visitors from 150 countries and over 2,500 exhibitors attended from all over the world, according to organizers. The Bauer Maschinen Group was also among the exhibitors once again and showcased two BG rotary drilling rigs as well as a selection of equipment from its subsidiaries Pileco, RTG, Klemm and MAT at its. The Bauer team welcomed more than 7,000 unique visitors and organized 441 guided tours.


Foundation Works on former Brewery Site: Bauer constructed the Excavation Pits for the Berlin Schultheiss Quartier


The German capital city is growing! With over 3.5 million inhabitants, Berlin is the biggest city in Germany and even decades after reunification, construction is still booming. New developments in the inner city are in particularly high demand. One such development is a 30,000 m² shopping and activity center in the Moabit district of Berlin Mitte – a once working-class district – on the grounds of the former Schultheiss brewery, steeped in tradition. The client, HGHI Schultheiss Quartier GmbH & Co. KG, is also building 6,000 m² state-of-the-art offices – almost half of which are listed as historical monuments. For the new-builds, Bauer Spezialtiefbau GmbH and JV partner Keller Grundbau GmbH constructed two complex excavation pits with a total area of 11,000 m² in confined inner-city conditions from May 2015 to November 2016.


Bauer AG has started to turn its Business Operations around in 2016

  • Total Group revenues are EUR 1,586.1 million (previous year: EUR 1,656.4 million); sales revenues are up by 1.3 % to EUR 1,396.9 million (previous year: EUR 1,379.0 million)
  • Earnings after tax at EUR 14.4 million (previous year: EUR 29.0 million) are towards the top of the latest forecast range of about EUR 10 to 15 million
  • Order backlog is at a high level: growth of 1.3 % to EUR 1,008.1 million
  • Proposed dividend for 2016: EUR 0.10 per share
  • Forecast for 2017: Group expects total Group revenues of around EUR 1.7 billion, earnings after tax of around EUR 23 to 28 million and EBIT of around EUR 75 million.

First Use in Toronto: Bauer BG 46 demonstrates top Performance

The Canadian Bauer Maschinen client Deep Foundations Contractors Inc. is carrying out the foundation work for the Parkside Square project in Toronto and in order to install the 28 m deep secant pile wall and 20 m deep single piles has opted for the latest equipment technology from Bauer: the Bauer BG 46, the most powerful rotary drilling rig currently on the market.


Bauer Renewables Ltd. involved in Foundation of Offshore Wind Farm off Scotland


In the long term, wind energy is the most important and economic renewable energy source in the field of electricity. Many offshore wind farms that are planned or currently under construction are located in the North and Baltic Seas, such as the Beatrice Offshore Windfarm Ltd (BOWL) project off the northeastern coast of Scotland. From 2019, 84 turbines will generate 588 megawatts of electricity over an area of around 130 square kilometers – enough electricity to supply 450,000 homes. Bauer Renewables Ltd., a subsidiary of Bauer Spezialtiefbau GmbH, will be involved in the foundation work with an underwater drilling rig specially designed for use on the high seas in order to relief drill the foundation piles.


Bauer Spezialtiefbau GmbH improves Ground for a new German Highway Section

Germany has one of the longest highway networks in the world, coming in after China, the USA and Spain. According to the German Federal Statistical Office, it comprises almost 13,000 kilometers, and continues to be extended. The expansion and new construction of the German highway network is particularly important in view of eliminating traffic bottlenecks and opening up, or rather connecting, structurally weak regions – eventually, economic growth also means traffic and mobility growth. Several new road sections are currently under construction, including section 5.1 of the federal highway A 72 in the district of Leipzig, where Bauer Spezialtiefbau GmbH is also involved in a joint venture.


Firmenverschmelzung bei Bauer Resources: Mit neuer Organisation gestärkt in die Zukunft

Anfang Dezember wurden die Firmen Bauer Umwelt GmbH, Bauer Water GmbH und Bauer Resources GmbH zu einer Firma zusammengefasst. „Das positive Wachstum unseres Umweltgeschäfts und die sich daraus ergebenden Anforderungen zeigen, dass die bisherige Aufstellung mit mehreren Firmen für die Zukunft nicht mehr passend war“, so Bauer Resources-Geschäftsführer Johann Mesch. „Durch das Zusammenführen der Bauer Resources GmbH, Bauer Umwelt GmbH und Bauer Water GmbH werden sich viele administrative Vereinfachungen bei der Abwicklung von Projekten ergeben, sodass wir nun mit gebündelter Kompetenz ein noch stärkerer Projektpartner sein werden.“


Bauer beginnt Großlochbohrungen beim Projekt Sanierung Kesslergrube

Im Juli 2015 erhielt die Bauer Resources GmbH von der Roche Pharma AG den Auftrag zur Sanierung von Perimeter 1/3-NW der Altablagerung Kesslergrube. Zentrale Aufgabe der Bauer Umwelt GmbH – der auf Altlastensanierung spezialisierten Tochterfirma der Bauer Resources GmbH – sind der Aushub und die Abfüllung von rund 280.000 Tonnen Erdreich in Spezialsicherheitscontainer sowie deren Abtransport. Das belastete Aushubmaterial wird anschließend der thermischen Behandlung zugeführt. „Die Sanierung Kesslergrube ist der größte Einzelauftrag in der Geschichte der Bauer Gruppe“, erklärt Gesamtprojektleiter Dr. Stefan Haaszio. Die Leitung für dieses Projekt zu übernehmen sei „eine einmalige Erfahrung und eine tolle Chance“, denn Projekte in dieser Größenordnung seien sehr selten.

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