Recycling and repurposing our land
With government and authority planning policies promoting the redevelopment of ‘brownfield’ sites, ground engineering is becoming a pivotal part of the planning and development process. The need to assess the potential hazards posed by the presence of ground gases (including methane, carbon dioxide, carbon monoxide, hydrogen sulphide), and often a variety of volatile organic compounds from natural causes or the former use of the land, and the design of appropriate mitigation measures are now routine requirements in the planning and construction process.
Our geotechnical engineers, from our sister company The Environmental Protection Group, specialise in evaluating the characteristics of the ground upon which a structure is to be built. They investigate and analyse a site for qualities such as soil characteristics, composition, and drainage, and evaluate soil, rock, groundwater, and man-made materials and their interaction with earth retention systems, structure foundations, and other civil engineering works.
Our ground engineering services
Aerial surveys
Aerial surveying is an accurate representation of the area of interest showing all natural and manmade features with levels. Shown as three dimensional points all features including the property, land features and physical boundary details are presented on a scaled survey drawing.
Our aerial surveys are used to support our planners and technical design consultants in the delivery of client proposals. Satellite imagery and very high flight height aerial photography reveal land use patterns useful in regional planning. Periodic small scale photography of urban areas shows urban and suburban growth patterns.
We will undertake the survey in order to locate, describe, monument, and map the boundaries and corners of a parcel of land.
Earthworks design
Earthworks can be a significant cost in development, and a constraint on what can be achieved on a given site. The condition of the material, both from a structural suitability perspective and contamination status also requires assessment, factoring into earthworks solutions the strategies for environmental remediation and structural solutions to deal with any sub-optimal earthworks conditions.
Before construction begins, our dedicated geo-environmental team will assess the suitability of the land, reviewing the level of natural or man-made constrain affecting the development, such as foundations from previous structures, or geotechnically and environmentally unsuitable materials. If required, they will then undertake a re-profiling review and advise on the necessary outcomes to ensure suitable construction platforms.
Geo-environmental consultancy
Combining rigorous scientific knowledge, familiarity with regulatory requirements, and technical expertise to conduct thorough environmental assessments, we identify and minimise risks. Conducting both field and desk-based research, we prepare detailed scientific reports on the findings and/or recommendations for a variety of clients and projects.
We will identify whether water, air, or land contamination will have an adverse impact on people, habitats, or sources of groundwater, and will deliver an assessment and interpretation of the available data, paired with local and national guidelines, to provide solutions based on these findings.
Geotechnical consultancy
The study of the geological material properties on a construction site are important to allow design and construction of stable structures that do not settle, deform or crack and do not fall down due to foundation failure.
Our geotechnical engineers seek to reduce this risk, by investigating and understanding the site’s subsurface conditions, and its behaviour under different loading conditions. We provide the full spectrum of geotechnical engineering capability, from desk study through field investigation, factual reporting, geotechnical interpretation, stability analysis, foundation assessment, design and supervision.
Ground investigation
During a ground investigation programme, field and laboratory work is undertaken to assess the ground conditions within the development, within the geographical, geological, hydrogological and environmental context. During these investigations, our consultants will deliver tailored programmes to determine the ground conditions for foundations, piling, vibroflotation, slope stability, retaining walls, earthworks, road design, sewer construction, dewatering and tunnelling. Following this, a second phase will commence, investigating and delivering designs and remediation strategies for contamination, landfill gas assessment, waste classification and waste disposal.
Our site investigations comprise of obtaining disturbed and undisturbed samples and carrying out in-situ testing (SPTs, CPTs) to characterise the ground conditions sufficiently. This allows safe and economic designs to be developed and reduce, as far as possible, the occurrence and impact of unforeseen ground conditions.
Ground remediation
A proposed development on or near land affected by ground gas or VOC emissions must be supported by a risk assessment submitted to the local planning authority by the developer (or his consultant) in order to comply with current planning policy and Building Regulations. Further to assessing the risks, we are often able to show that mitigation measures are not required.
We have demonstrated that early involvement in project evaluation enables our engineers to provide an effective, technically robust remediation design; incorporating both traditional and cutting edge proven technologies to ensure that the preferred solution is appropriate, safe and cost effective. Our standard work practise involves looking at the project to assess the potential for incorporating sustainable remediation techniques to reduce the overall carbon footprint and the environmental impact associated with the suggested solution.
Contaminated land and soil remediation
Rapid development in social and economic areas has created an environment of serious contamination of soils and groundwater. Contamination sources from industry, agriculture and urban areas have resulted in the accumulation, mobilization and toxicity of various contaminants in soils and groundwater that are threatening the natural environment as well as the sustainable development.
Our engineers will review, design and implement the remediation strategy to clean up the contaminants in soils and groundwater. General technical methodologies proposed may include transfer of contaminants solely by themselves, with contaminated soils, or groundwater to other places for final treatment or disposal, the confinement of contaminants within the development, or the destruction of contaminants on the site of the development.
Ground gas risk assessment
Natural ground gas and landfill gas can be odorous, toxic, asphyxiating, flammable and explosive. Due to these potential hazards, sites that could be affected should be investigated to assess the risks and if necessary, remedial or counter measures implemented to manage the risk. Ground gas, whether derived from landfill, mining or natural sources can pose a risk to a development when there is a viable pathway through the sub surface soils that allows gases to migrate into buildings and accumulate within confined spaces.
Our team will undertake in-situ ground gas monitoring to determine the level of ground gas protection measures required. We provide a number of options for assessing the risks from ground gases including a desk based appraisal of potential sources, measurement of organic carbon concentrations and assessment in accordance with CL:AIRE RB17, or the installation of standpipes and monitoring over a period of time in accordance with BS8485: 2015.
our projects
Northern Roots
delivering end-to-end bespoke solutions
As a multi-disciplinary, interconnected team, we bring together experts who develop solutions to create places which improve people’s lives as humanity adapts to the unprecedented challenges posed by climate change and population growth. We offer our clients tailor made strategies to support their goals and objectives, whether that be complete end to end project delivery or specific, targeted solutions. Our promise is to deliver future proof strategies and designs, that will stand the test of time, harmonising the ever increasing demands being placed on the built and natural environment.
let’s start our conversation today
If you’ve got a question, or would like us to help you with a project, we’d love to hear from you. Complete the form, give us a call or come and see us.
