Contact Us

HBR Head Office
7 Appleton Court, Calder Park,
Wakefield, WF2 7AR

Telephone: 01924 250 132

Fax: 01924 251 394

email: enquiries@hbrlimited.co.uk

Blackwell Southern Regional Office

Coggeshall Road, Earls Colne
Essex, CO6 2JX

Telephone: 01787 222768

Fax: 01787 224391

email: enquiries@hbrlimited.co.uk
Blackwell Midlands and South West Regional Office
4 Bredon Court, Brockeridge Park,
Twyning, Gloucestershire
GL20 6FF

Telephone: 0844 482 9685

email: enquiries@hbrlimited.co.uk
Blackwell Scottish Regional Office
Broken Cross,
Douglas Water,
Lanark
ML11 9PB

Telephone: 01324 483713

email: enquiries@hbrlimited.co.uk
HBR Certificates

Services & Processes

 

Engineered containment and cut off walls

HBR can design and construct an array of low permeability containment systems to mitigate contaminant migration in the subsurface. These include vertical barriers (walls), basal barriers (floors) and surface barriers (caps).

Vertical techniques provide containment through the use of soil-bentonite and cement-bentonite slurry trench cut-off walls, steel sheet pile walls, puddle clay barrier walls and deep soil mixed barriers.  The use of horizontal or complete encapsulation, such as the treatment of redundant landfill sites and other locations with high contamination concentrations affecting groundwater resources, is commonly provided with a basal liner of geotextile and HDPE or bentonite polymer enriched sands.  Grouted bottom barriers can also be constructed through existing soils/wastes.  These methods promote the use of long term in-situ remediation processes, whilst the groundwater and site end-users are protected.  Our Group Company, Blackwell also has vast experience in the design and construction of landfill cells, which have included engineered basal layers and surface capping systems to prevent infiltration. Geocomposite, geosynthetic and geotextile capping solutions have all been constructed.


Permeable reactive barriers (PRB's)


A PRB is an engineered in situ treatment zone of reactive media.  When installed in the flow path of contaminated ground water, PRB's can remove contaminants as it passes through a more permeable 'reactive' section.  Lower permeability barrier sections, essentially cut off walls, can be used to direct ground water through the reactive section.  These are often termed funnel and gate systems.

A variety of reactive media can be used depending on the contaminants present, which either immobilise contaminants by sorption mechanisms or transform them by biological and chemical processes.  Installation can be carried out by soil mixing or traditional slurry walling techniques.

HBR staff have significant experience of the design and construction of PRB's. In order to optimise the design, we undertake laboratory treatability studies, using flow through testing with soils and groundwater from the site of concern, in order to establish sorption capacity, breakthrough, residence time and flow rates with various reactive media.  This enables actual barrier performance to be predicted.

Virtual reactive barriers can also be used, consisting of a series of well points, where extraction or injection techniques can be employed to remove or destroy contaminants.

Research & Development (R&D)


The business development objective of HBR is to provide a remediation service of consistent quality using modern and innovative technologies of proven capability.  To enable ongoing improvements, HBR undertakes and funds research and development projects into novel techniques to ensure the most up to date knowledge is available to clients within the remedial solutions.  This includes field trials to ensure that laboratory based processes can be scaled up to the construction environment without losing the essential quality control.

As the standards for remediation projects are constantly subject to modification, HBR commits resources to seek alternative methods in use elsewhere within the world.   HBR have internationally recognised experts in specific remediation technologies, having been widely published in peer reviewed publications and are active in R&D at a number of academic institutions.

Treatability Studies and Pilot Testing


Conducting bench-scale treatability studies on target soils and groundwater is a pre-requisite to ensuring a suitable, robust remedial approach is designed and programmed.  HBR regularly advises clients and consultants alike on the benefits of accommodating these studies into their overall construction programme, in order to provide cost certainty, likely performance and regulatory acceptance.  Such studies are essential where stabilisation/solidification, chemical oxidation and PRB technologies are being proposed.

We are able to use our own in-house facilities and remediation technicians to undertake this testing work for the full range of ex-situ and in situ techniques within our range of services.  We have also developed strong links with established academic research institutes and hi-tech industry suppliers, from reagents to analytical services, to increase the sphere of testing that can be applied.

Onsite field scale pilot trials follow on from bench-scale work, scaling up the proposed remedial solution to provide further assurance and comfort to all parties that the approach will provide a robust solution with cost surety.  Pilot trials allow fine tuning of the remedial design, relevant to both the choice and scale of plant, as well as treatment reagents.

HBR have a range of plant suitable for pilot trial work, where rapid mobilisation/demobilisation and treatment flexibility provides maximum advantage to the project team:

  • Windrow tractor and turner
  • Computer controlled S/S batch mixer with real time adjustable recipe design for liquid and powder reagents
  • Small scale soils washing plant mobilised and ready for work within one week of order
  • In situ soils and groundwater plant with high/low vac system, aqueous/gaseous GAC (fully ATEX rated).

Remediation Design and Feasibility Consultancy


By working alongside consultants or directly with clients, HBR are able to offer detailed remedial option appraisals and remediation design for contaminated land problems.  We do this by reviewing existing site data, undertaking and managing further ground investigation to address any data gaps, as well as undertaking our own laboratory based treatability studies to ensure, we are able to remove the key remediation drivers and achieve remedial target specifications.

Our experience as a contractor also allows us to identify and focus on the key operational and performance issues, related to any proposed remedial option.  The result is often a move away from a formulaic concept, to a bespoke integrated set of solutions that enables increased cost efficiencies and performance guarantee.

If you would like assistance in reviewing your project, please contact us on 01787 222768.

Monitoring and Validation


HBR undertake remediation monitoring (soils, waters, air and process) before, during and after completion of the remediation works to ensure the environmental risks and liabilities associated with the site contamination have been fully addressed.  We understand that the recovery of the most appropriate process data, as well as wider environmental indicators, is critical for providing multiple lines of evidence for remediation validation and verification in order to obtain regulatory sign off.