DR. SPANG INGENIEURGESELLSCHAFT FÜR BAUWESEN, GEOLOGIE UND UMWELTTECHNIK MBH

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DR. SPANG INGENIEURGESELLSCHAFT
FÜR BAUWESEN, GEOLOGIE
UND UMWELTTECHNIK MBH

Water/Wastewater

Selected reference projects

Dr. Spang GmbH

Drinking water supply, Rieden and Pforzen


Developer

Kaufbauren Municipal Waterworks via Dr. Blasy - Dr. Overland Beratende Ingenieure GmbH & Co. KG, Baldham

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 677 KByte

Project

  • The communities of Rieden and Pforzen are to be connected to the Kaufbeuren drinking water supply system
  • This requires the laying underground of pipes for the drinking water of DN 200 and DN 250 with a total length of approx. 5.6 km along the edge of the road and the construction of manhole structures
  • The overburden of the drinking water pipes is approx. 1.5 m

Our services

  • Subsoil investigation including soil physical and environmental chemical analyses
  • Geotechnical expert report for laying the water pipes
   

Sewer renewal on Walpurgisstraße and Wittekindstraße in Essen-Rüttenscheid


Developer

Stadtwerke Essen AG

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 644 KByte

Project

  • Renewal of various sewer sections in the Wittekindstraße, Walpurgisstraße and Alfried-Krupp-Straße area
  • Construction of a new sewer of DN 1200 on Walpurgisstraße over a length of approx. 276 m, 7 manhole structures with depths approx. 5 m in the cut-and-cover method
  • Pipe driving method over a length of approx. 590 m, DN 1600, on Wittekindstraße and on Walpurgisstraße
  • Construction of a new sewer, DN 300, over a length of approx. 340 m in the cut-and-cover method
  • Preparation of 4 start and target ditches
  • Preparation of 2 special structures with depths up to 10 m

Our services

  • Subsoil investigation
  • Subsoil assessment and subsoil expert report
  • Evaluation of the existing mining situation
  • Environmental impact assessment
  • Recommendations on driving methods and backfilling methods
   

Sewer construction project on Westfalenstraße, Essen-Steele


Developer

Stadtwerke Essen AG

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 842 KByte

Project

  • Performance of a sewer construction project in the Westfalenstraße area in Essen-Steele
  • During the inspection of the excavation indications of old mines near to the surface were found in the section between the Dinnendahlstraße and Am Deimelsberg roads
  • Environmental impact assessment of the excavated material in the sewer section

Our services

  • Geotechnical services
  • Determination of the actual mine situation
  • Analysis of the excavated road and soil material
   

Pipe driving for Pferdebachstraße sewer under DB track section Witten- Dortmund (S6)


Developer

Town of Witten, drainage department

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 436 KByte

Project

  • Renewal of a sewer, DN 1,000
  • Crossing below DB section 2801 Witten-Dortmund (S6) at km 18.313 by means of pipe driving as part of works to renew the sewer on Pferdebachstraße
  • Driving over a length of approx. 37.5 m

Our services

  • Groundwater measuring points
  • Geotechnical consulting services
  • Geotechnical support during construction
   

ÖV Oespeler Bach lots 1 and 2


Developer

Emschergenossenschaft

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 705 KByte

Project

  • Driving below the track, DN 900, length: 100 m
  • Renaturation 2.200 km
  • Temporary separating embankment
  • Creation of flood protection dyke

Our services

  • Geotechnical support during construction
  • Preparation of expert report and soil mechanical laboratory analyses
  • Site management, soil management
  • Expert support and external monitoring of the safeguarding/redevelopment measures
   

Construction of new combined sewer, Im Schießgärtle, Stuttgart-Möhringen


Developer

City of Stuttgart, SES civil engineering unit, drainage department

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 837 KByte

Project

  • Construction of new combined sewer on the Im Schießgärtle road in Möhringen
  • Total length approx. 210 m
  • Approx. 150 m to be constructed by pipe driving up to DN 2400, the rest in the cut-and-cover method up to DN 1000

Our services

  • Subsoil evaluation and foundation works consulting
  • Elaboration of the investigation concept
  • Soil mechanical laboratory tests
  • Soil mechanical analyses
  • Expert consultancy services
  • Geotechnical support during construction
   

Ecological improvement of the Roßbach in Dortmund, Schmechtingsbach phase


Developer

Emschergenossenschaft, Essen

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 911 KByte

Project

  • Ecological improvement of the Roßbach in Dortmund, 2nd design section
  • 1st construction phase ÖV Schmechtingsbach km 0.530 - km 2.340
  • 2nd construction phase ÖV Schmechtingsbach km 0.032 - km 0.530 (Schmechtingsbach flood retention basin)

Our services

  • Geotechnical support for execution planning and execution works
  • Stability calculations
  • Foundations works consulting during construction
  • Analysis of QA measures, documentation of the results
  • Expert opinions
  • Preparation of geotechnical cross-sections as the basis for determining quantities, verification of quantity estimates
  • Inspection of tender documents
   

Track crossing of the FWO water pipeline in the expansion of the DB Nuremberg-Ebensfeld railway line (VDE 8.1)


Developer

Fernwasserversorgung Oberfranken, Kronach

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 296 KByte

Project

  • Relocation of a water pipeline at track km 17.993
  • The pipe has a diameter of DN 700 and for the crossing is housed in a protective steel tube with an outer diameter of DN 1100
  • Water retention measures require the excavation of a start and a target pit for the approx. 42 m-long throughpress section

Our services

  • Subsoil investigation
  • Subsoil report
  • Hydraulic calculations
  • Water right application
  • Calculation of construction water drainage requirements
  • Assessment of groundwater conditions
   

Construction of new canal at Tönnishäuschen, Ahlen


Developer

Town of Ahlen, Ahlen Environmental Services, Wastewater Plant

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 288 KByte

Project

  • Construction of a new approx. 500 m-long canal including the necessary shaft structures for protecting water
  • Diameter of DN 200 to DN 500 on the "Tönnishäuschen" road in Ahlen
  • Installation depths between 2 and 3.5 m

Our services

  • Subsoil analysis
  • Subsoil evaluation and route appraisal
  • Waste evaluation
   

Rehabilitation of the wastewater installations of the Schweppermann barracks, Kümmersbrück


Developer

Lippeverband, Essen

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 366 KByte

Project

  • Examination of the infiltration capacity of precipitation runoffs for the purposes of natural rainwater management as a substitute for diversion into the sewage system
  • Performance of subsoil analysis in order to establish the basis of further planning and measurement approaches with evaluation of the infiltration capacity of the local soil
  • Inspection and evaluation of the surfacing of fortified open spaces (asphalt, concrete, base courses) with regard to issues of relevance to disposal

Our services

  • Performance of 33 small percussion borings pursuant to DIN 4021
  • Performance of 26 heavy percussion borings pursuant to DIN 4094
  • Removal of 12 bore cores from fortified surfaces
  • Performance of tests with the double-ring infiltrometer pursuant to DIN 19682-7 in order to determine the permeability of the soil in 6 dredging pits
  • Presentation of the kf values and subsoil condition
  • Evaluation of the infiltration capacity of the soil in an expert report
   

Sewer with storage capacity, Hachhausen


Developer

Lippeverband, Essen

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 292 KByte

Project

  • New sewer of Qmax and 2Qt collectors in Datteln
  • New sewers DN 1000 to DN 2500 laid in cut-and-cover and enclosed (pipe driving with suspension support) method
  • Cut-and-cover section length approx. 0.7 km, depth 3 m to 8 m
  • Driving section length approx. 0.6 km inc. 5 press/target pits
  • Construction of a new storage sewer DN 2500 within a sheet pile box construction

Our services

  • Subsoil and foundation works consulting during construction
  • Soil management during construction
  • Technical review of special proposals
  • Assistance in award of contract
  • Geotechnical site management
   

Fuchsstein wastewater system


Developer

Amberg municipal civil engineering department

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 245 KByte

Project

  • Construction of new sewerage, rainwater dirty water system DN 250 to DN 1.000
  • Construction of a wastewater system for the Fuchsstein area
  • Connection to the town sewerage system in the Speckmannshof area approx. 1 km east of Fuchsstein
  • Connection of a total of 58 buildings

Our services

  • Small percussion borings and dynamic probings • Soil mechanical laboratory tests
  • Core borings through the asphalt of the existing roads
  • Chemical analyses
  • Subsoil analysis and foundation works consultancy
   

Renewal of waste and rainwater sewers, Am Spaltwerk


Developer

City of Düsseldorf, municipal drainage department

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 361 KByte

Project

  • Construction of new draft engine and high-pressure pipeline
  • As part of the redevelopment of the sewerage system a DN 300 rainwater connection with a length of 42.71 m with 2 reaches and installation depths of between approx. 1.5 and 2 m is being laid
  • Construction of a new DN 500 sewer in the existing trench, likewise with 2 reaches, and installation depths of between approx. 3 and 4.5 m and a length of 56.37 m
  • Instead of an existing culvert under the Düssel, a DN 200 high-pressure pipeline will be laid on the existing arched bridge over the river
  • The new pipe has a length of approx. 44 m and is to be laid with a cover of 1 m

Our services

  • Subsoil investigation
  • Field and laboratory analyses
  • Foundation works consultancy
  • Expert report on existing contamination and disposal concept
  • Opinions and expert report on the planning of the drainage facilities
   

Sewer connection for Heidelberger Straße, Düssel basin facility, left and right bank


Developer

City of Düsseldorf, municipal drainage department

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 319 KByte

Project

  • Construction of an RRB draining into the Düssel
  • As part of the restructuring of the sewerage system a proposed rainwater retention basin is to be connected by DN 1200 pipe to the DN 1,000 sewer in Heidelberger Straße with a length of 41.65 m
  • Pipe bottom approx. 3.70 m below ground level
  • The RRB has dimensions of approx. 17.5 m x 15.5 m
  • Sewers connected by means of driving
  • The concrete structure integrates into the subsoil at approx. 8.5 m of depth

Our services

  • Subsoil investigation
  • Foundation works consultancy
  • Expert report on existing contamination and disposal concept
  • Geotechnical expert report for the drainage facilities
   

Wittener Bruch


Developer

Town of Witten, drainage department

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 878 KByte

Project

  • Renewal of approx. 320 m sewer, DN 300/400
  • • Renewal of approx. 100 m sewer, DN 1800
  • Installation depth between approx. 2.5 and 5 m
  • Partial installation in the culvert of the earth bank of Dortmunder Straße

Our services

  • Inspection of mine plans and elevations
  • Subsoil and environmental analyses with geotechnical expert report
  • Static calculations
  • Test statics
  • Invitation to tender for underpinning works and supervision of HDI construction works
  • Examination of building risks
  • Supplementary chemical analyses
  • Supervision of HDI underpinning works
   

Construction of a new foul water sewer at the Dünnebecke


Developer

Town of Witten, drainage department

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 97 KByte

Project

  • Laying of a new foul water sewer in the area of the Dünnebecke south of the BAB A 40 in Dortmund
  • Diameter DN 400
  • Varying depths between approx. 1.5 m and > 7 m
  • 4 reaches
  • Total length approx. 340 m
  • Sewer laid in micro-tunnel method

Our services

  • Subsoil investigation and foundation works consultancy
  • Evaluation of excavated soil for contamination
   

Ecological improvement of the Roßbach in Dortmund, 2nd design section


Developer

Emschergenossenschaft, Essen

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 262 KByte

Project

  • As part of the improvement works, the existing watercourses rectified with ground slabs are being widened to meander
  • The ground slab and bedding material will be largely taken up and excavated
  • Bridge structure for Martener Straße
  • Outlet structure and underground barrier of the Schmechtingsbach high-water basin

Our services

  • Subsoil investigation and foundation works consultancy
  • Evidence of bearing capacity and fitness for purpose pursuant to DIN 19 700-12 (high-water basins)
  • Analysis of existing contamination during construction
  • Subsoil and foundation works consultancy during construction
   

Ecological improvement of the Roßbach in Dortmund, 1st design section


Developer

Emschergenossenschaft, Essen

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 155 KByte

Project

  • As part of the improvement works, the existing watercourses rectified with ground slabs are being widened to meander
  • The ground slab and bedding material will be largely taken up and excavated
  • Engineering intervention for the construction of new bridge structures, high-water basins and water passages

Our services

  • Subsoil investigation and foundation works consultancy
  • Evaluation of the contamination of the excavated soil, ground slabs and bedding material
  • Subsoil and foundation works consultancy during construction
   

Sewer with storage capacity, Hachhausen


Developer

Lippeverband, Essen

Dr. Spang GmbH



Project

  • New sewer of Qmax and 2Qt collectors in Datteln
  • New sewers DN 1000 to DN 2500 laid in cut-and-cover and enclosed (pipe driving with suspension support) method
  • Section lengths: cut-and-cover approx. 0.7 km, depth 3 m to 8 m, driving: approx. 0.6 km inc. 5 press/target pits
  • Construction of a new storage sewer DN 2500 within a sheet pile box construction

Our services

  • Subsoil and foundation works consultancy during construction
  • Soil management during construction
  • Technical review of special proposals
  • Assistance in award of contract
   

Expansion of the central sewage treatment plant, Freiberg


Developer

City of Freiberg, waste water disposal services

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 88 KByte

Project

  • Subproject to clear a site in order to create a rainwater retaining basin in the Münzbach valley

Our services

  • Research of historical documents regarding previous construction
  • Investigations of existing building fabric / materials for pollutants
  • Preparation of a demolition and disposal concept with determination of the quantities of building materials requiring separation
  • Determination of the disposal routes for building fabric requiring particular monitoring (e.g. asbestos, PCBs, tar cork, etc.)
  • Elaboration of the necessary documents for approvals and consents
  • Cost estimate and calculation of construction times
  • Preparation for award of contract
  • Assistance in award of contract
  • Construction supervision
   

Replacement of drain for dirty water and rainwater


Developer

Düsseldorf City Council, Urban Drainage Dept.

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 453 KByte

Project

  • Replacing drain in the Recklinghauser Strasse in Düsseldorf-Rath
  • Creating the new drains DN 250 to DN 600 using the existing route and at roughly the same depth
  • Rainwater channel, approx. 588.2 m long, with 16 brackets and 17 shafts
  • Dirty water channel, approx. 489.4 m long, with 13 brackets and 13 shafts

Our services

  • Geotechnical report for the section
  • Devising an investigation concept
  • Soil and subsoil investigation
  • Field tests and lab tests
  • Investigations of previous pollution, report on previous pollution
  • Assessment of subsoil and advice on foundations
   

Developing concept to assess
status of rainwater retention
and percolation water basin


Developer

Landesbetrieb Bau Sachsen-Anhalt, Magdeburg

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 102 KByte

Project

  • Due to problems in the operational safety of rainwater and percolation water basins in Saxony-Anhalt, extensive servicing and maintenance works will be needed in future in order to extend the lifetime of the facilities.

Our services

  • Technical engineering recording of the issues
  • Devising recommendations for action
  • Recording the status of facilities for drainage from roads
  • Devising instructions for planning of rainwater and percolation water basins to conform to guidelines
  • Reviewing authorisation: taking off rainwater from road areas
   

Drain replacement, Fischertalweg / Hans-Böckler-Str, Witten


Developer

Witten Town Drains Dept.

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 160 KByte

Project

  • Replacement of DN 300 drain
  • 215 m new drain construction
  • Open-type laying, at depth of 2 m to 3.5 m
  • Connection to the collector in Herbeder Strasse
  • New construction of 4 shallow-foundation shaft constructions, preformed shafts, Ø = 1,200 mm

Our services

  • Investigation of subsoil and assessment of subsoil pursuant to DIN 4022, DIN 4023 and DIN 18 196
  • Report on pipe advance
  • Gathering of evidence on the buildings located within the area of influence
  • Stability investigations in order to check on possible effects on the buildings in advance
  • support during construction
  • Assessment of soil excavation
  • Environmental engineering assessment
   

Extensions to the shared sewage treatment works,
Mönchengladbach- Neuwerk


Developer

Niersverband, Viersen

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 393 KByte

Project

  • New construction of active sludge bed, foul towers, final sedimentation tank and thick slurry storage basin; total developed area approx. 2 ha; foundations up to 10 m deep
  • Soil composition: The subsoil comprises bound and loose low terraced Rhine sediments, underlaid with tertiary fine sands and coarse clays
  • Groundwater: Groundwater levels rise to the site surface level, permeabilities up to kf = 7 x 10-3 m/s; during the construction period ranging up to 1 km due to water raising

Our services

  • Investigation of subsoil using drillings and drilling samples pursuant to DIN 4021 and heavy pile-driving samples pursuant to DIN 4094, establishing well borings DN 800
  • Pumping capacity tests, evaluation, hydraulic calculations to establish obstructions, demonstration of effects on groundwater management. Hydraulic calculation of various foundation ditch options to minimise groundwater lowering with cost/benefit comparison
  • Assessment of subsoil and advice on foundations, planning underpinning works, recommendations on ability to execute various foundation options, calculations to establish permanent measures and measures during the construction period to ensure lift
   

Replacement drain, Aischbach
in Stuttgart-Möhringen


Developer

Stuttgart City Authorities, Underground Civil Engineering Dept.

Dr. Spang GmbH


Download the project description
Dr. Spang GmbH PDF, 140 KByte

Project

  • Replacing a mixed water drain DN 1600
  • Total length 484 m in the inner city area
  • Pipe advance with 3 pressed galleries and 2 target galleries

Our services

  • Investigation of subsoil, assessment of subsoil and advice on foundations pursuant to HOAI, Part XII, § 92, Lph. 2 to 3
  • Statements on suitable advance procedures and on establishing the pressed and target galleries
  • Presentation of possible effects on neighbouring buildings
  • Advice to client during construction regarding adapting the advance to the changing soil and groundwater conditions
  • Examining the obstruction planning for compliance with conditions from the decision by the lower-tier water authorities in respect of water laws
   

Extending the Waltrop sewage treatment works, 2nd phase construction

Developer

Lippeverband Essen

Dr. Spang GmbH

Download the project description
Dr. Spang GmbH PDF, 142 KByte

Project

  • Extending or converting the Waltrop sewage treatment works
  • New construction of 2 final sedimentation tanks to the north-west of the existing initial sedimentation tank
  • As part of the construction measure, extensive construction water raising is required for the final sedimentation tanks

Our services

  • Preparing a subsoil report
  • Investigation concept pursuant to DIN 4020
  • Solids investigation
  • Advice on foundations during construction and support for drilling works
  • Hydrogeological assessment and application in relation to water laws
  • Devising and calibrating a groundwater model
  • Groundwater flow model MODFLOW Materials transport model MT3D

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Dr. Spang GmbH

Company head office Witten

Phone: 02302 - 9 14 02 -0
Fax:  02302 - 9 14 02 -20
E-Mail zentrale@dr-spang.de

Esslingen/Neckar

Phone: 0711 - 351 30 49 -0
Fax:  0711 - 351 30 49 -19
E-Mail esslingen@dr-spang.de

Frankfurt am Main

Phone: 069 – 678 6508 – 0
Fax: 069 – 678 6508 – 20
E-Mail frankfurt@dr-spang.de

Freiberg/Saxony

Phone: 03731 - 79 87 89 -0
Fax:  03731 - 79 87 89 -20
E-Mail freiberg@dr-spang.de

Nuremberg

Phone: 0911 - 9 64 56 65-0
Fax:  0911 - 9 64 56 65-5
E-Mail nuernberg@dr-spang.de

Naumburg/Saale

Phone: 03445 - 762 - 25
Fax:  03445 - 762 - 20
E-Mail naumburg@dr-spang.de

Hamburg

Phone: 040 – 524 73 35-0
Fax:  040 – 524 73 35-20
E-Mail hamburg@dr-spang.de

Berlin

Phone: 0331 - 231843 - 0
Fax:  0331 - 231843 - 20
E-Mail berlin@dr-spang.de

Munich

Phone: 089-2 77 80 82-60
Fax:  089-2 77 80 82-90
E-Mail muenchen@dr-spang.de

Download

Project descriptions

  • Drinking water supply, Rieden and Pforzen
    Dr. Spang GmbH PDF, 677 KByte
  • Sewer renewal on Walpurgisstraße and Wittekindstraße in Essen-Rüttenscheid
    Dr. Spang GmbH PDF, 644 KByte
  • Sewer construction project on Westfalenstraße, Essen-Steele
    Dr. Spang GmbH PDF, 842 KByte
  • Pipe driving for Pferdebachstraße sewer under DB track section Witten- Dortmund (S6)
    Dr. Spang GmbH PDF, 436 KByte
  • ÖV Oespeler Bach lots 1 and 2
    Dr. Spang GmbH PDF, 705 KByte
  • Construction of new combined sewer, Im Schießgärtle, Stuttgart-Möhringen
    Dr. Spang GmbH PDF, 837 KByte
  • Ecological improvement of the Roßbach in Dortmund, Schmechtingsbach phase
    Dr. Spang GmbH PDF, 911 KByte
  • Track crossing of the FWO water pipeline in the expansion of the DB Nuremberg-Ebensfeld railway line (VDE 8.1)
    Dr. Spang GmbH PDF, 296 KByte
  • Construction of new canal at Tönnishäuschen, Ahlen
    Dr. Spang GmbH PDF, 288 KByte
  • Rehabilitation of the wastewater installations of the Schweppermann barracks, Kümmersbrück
    Dr. Spang GmbH PDF, 366 KByte
  • Sewer with storage capacity, Hachhausen
    Dr. Spang GmbH PDF, 292 KByte
  • Fuchsstein wastewater system
    Dr. Spang GmbH PDF, 245 KByte
  • Renewal of waste and rainwater sewers, Am Spaltwerk
    Dr. Spang GmbH PDF, 361 KByte
  • Sewer connection for Heidelberger Straße, Düssel basin facility, left and right bank
    Dr. Spang GmbH PDF, 319 KByte
  • Wittener Bruch
    Dr. Spang GmbH PDF, 878 KByte
  • Construction of a new foul water sewer at the Dünnebecke
    Dr. Spang GmbH PDF, 97 KByte
  • Ecological improvement of the Roßbach in Dortmund, 2nd design section
    Dr. Spang GmbH PDF, 262 KByte
  • Ecological improvement of the Roßbach in Dortmund, 1st design section
    Dr. Spang GmbH PDF, 155 KByte
  • Sewer with storage capacity, Hachhausen
  • Expansion of the central sewage treatment plant, Freiberg
    Dr. Spang GmbH PDF, 88 KByte
  • Replacement of drain for dirty water and rainwater
    Dr. Spang GmbH PDF, 453 KByte
  • Developing concept to assess status of rainwater retention and percolation water basin
    Dr. Spang GmbH PDF, 102 KByte
  • Drain replacement, Fischertalweg / Hans-Böckler-Str, Witten
    Dr. Spang GmbH PDF, 160 KByte
  • Extensions to the shared sewage treatment works, Mönchengladbach- Neuwerk
    Dr. Spang GmbH PDF, 393 KByte
  • Replacement drain, Aischbach in Stuttgart-Möhringen
    Dr. Spang GmbH PDF, 140 KByte
  • Extending the Waltrop sewage treatment works, 2nd phase construction
    Dr. Spang GmbH PDF,142 KByte