Presentations from the AGS Annual Conference 2021 can be viewed below:
Posts by Katie Kennedy
The Data Management committee has been busy again. Just months after releasing AGS 4.1 we are releasing a beta version of an AGS file validator. The ‘AGS Validator BETA’ is free to download and will provide a single source for validating ‘Electronic Transfer of Geotechnical and Geoenvironmental Data – AGS4’ (AGS Data Format) files.
For many years the industry has used commercial AGS Data Format checking applications (checkers) that sometimes produce differing results due to the varied assumptions made by the developers. Therefore, clients have traditionally specified AGS files must be validated by several of these checkers before the data is submitted to them, resulting in additional work for clients, contractors, and software providers.
The AGS Validator initiative, started by Asitha Senanayake from Fugro and aided by Roger Chandler from Bentley, has been running for six months and has been rigorously tested by members of the AGS committee over recent months. The committee feel it is ready to be tested in the real world and are therefore releasing it to the industry for beta testing.
The ‘AGS Validator BETA’ is a standalone software program. There are further initiatives in the pipeline to provide capability to import AGS Data Format files into Excel and the BGS are working on an online web validator due for release at the end of the summer.
All validator Python libraries have been developed under Lesser General Public (LGPL) open-source licences and the AGS would welcome review of the code and further comment. The project has received coding contributions from four countries to date, demonstrating the power of the collaborative, open-source working environment.
To download the beta software visit:
If you have any questions, find any problems or need help with the AGS Validator BETA please complete the feedback form on the website, or if your company are a registered data format user please post your comment on the AGS Discussion Boards at www.ags.org.uk/data-format/dwqa-questions.
The AGS Validator will be in Beta until the Autumn 2021, it must not be specified in contracts until it is fully released later in the year.
Asitha Senanayake, Project Engineer at Fugro –
“I have been using AGS data in my role for several years and have found open-source software to be invaluable for this work. I started this open‑source project to supplement the functionality of the Python Pandas data analysis library to work with AGS data, and I am delighted that the AGS committee has adopted and expanded it”.
Roger Chandler, Geotechnical Information Management Director at Bentley –
“It is a pleasure to lead this project. Bentley fully supports this venture and will be promoting the use of this AGS Validator instead of our gINT and KeyAGS checkers. We will be integrating the AGS Validation into OpenGround in the coming months.”
Edd Lewis, Standards Lead, BGS –
“The BGS welcomes this new AGS initiative and fully embraces it to help improve the quality of the AGS Data Format files being submitted to the BGS Depository via our upcoming Web API”.
Time : 18:30 – 19:30 (Hong Kong Time) (11:30am – 12:30pm – UK Time)
Venue : The webinar will be conducted through Zoom.
Successful applicants will be provided a link to the seminar. Participants should arrange for their own device with a stable network environment to join the webinar.
Enquiry : For general enquiries, please contact
Haydn Chan (email: email@example.com)
Seminar Fee : Free of charge
Registration : https://forms.gle/NEUdC92bQCk1bWx46
Please register by 25th October 2021. Successful applicants will receive webinar details on 26th October 2021. CPD certificate will be sent to the attendees after the webinar.
On 4 November 2020, AGS(UK) held a Webinar entitled “Critical Links in Ground Engineering”. The subject of the November Webinar was Instrumentation and Monitoring (I&M), and it was the first event of its kind organised by AGS(UK).
This Webinar will essentially be a summary of the presentations given in November 2020 and updated as necessary.
The Webinar will, therefore:
• Describe the scope and types of I&M and identify the role of I&M as a critical link in Ground Engineering.
• Address the challenging issue of I&M data management.
• Outline the I&M situation in Australasia, based on a personal perspective on the challenges of I&M work in that region, and introduce a wider global dimension to the Webinar.
• Tackle the subject of international standards for geotechnical monitoring, tracing their development and content to the present day. Standards currently in preparation, as well as those anticipated in the future, will be identified, as will be Technical Committees that have been formed to address I&M.
• Identify the UK’s strategy to develop training for installation and monitoring technicians which dovetails in with the development of Vocational Qualifications and compliance with the Standards. Wider issues of education, training and qualifications will also receive attention.
• Provide details of the Aims of, and the Activities being undertaken by, the UK’s I&M Working Group.
Non-Executive Director and Advisor at Geotechnical Observations Limited
Jonathan Gammon is Non-Executive Director and Advisor at instrumentation and monitoring specialists Geotechnical Observations Limited. He is a Chartered Civil Engineer and Chartered Geologist with more than forty-five years of international construction experience working for consultants and contractors. His experience encompasses the design, specification, procurement, and implementation of instrumentation and monitoring, together with the acquisition, management, and interpretation of data. He is a UK Representative on the ISSMGE’s Technical Committee TC220 (Field Measurement in Geomechanics). At the end of 2019, he was responsible for establishing AGS(UK)’s Instrumentation and Monitoring Working Group (I&MWG), of which he is now Leader.
Jonathan was Geotechnical Design Manager and Resident Engineer for West Rail in Hong Kong during the period 1996 to 2002. He was subsequently Sub-Surface Design Manager for the Reference Design of Dublin Metro North in Ireland. In the UK, his experience includes Crossrail, Thameslink (Blackfriars Station Redevelopment), and the Northern Line Extension (for which he was the Expert Witness, Engineering at the Public Inquiry). He was Design Project Manager for the Bond Street Station Upgrade in Central London before working for more than two years on Phase One of the High Speed Two (HS2) railway between London and Birmingham. He retired from his position as Technical Director, Tunnelling and Geotechnics, at CH2M (now Jacobs) in August 2017.
The Association of Geotechnical and Geoenvironmental Specialists are pleased to announce the August / September 2021 issue of their publication; AGS Magazine. To view the magazine click here.
This free, publication focuses on geotechnics, engineering geology and geoenvironmental engineering as well as the work and achievements of the AGS.
There are a number of excellent articles in this issue including;
Thoughts from the Chair: Time – Page 8
Missing a trick? – Redeveloping Landfill Sites – Page 18
Taking soil samples for determination of Volatile Organic Compounds (VOCs) – Page 22
Q&A with Stephen Hugh Mallett – Page 26
Inside: SOCOTEC UK – Page 28
Plus much, much more!
Advertising opportunities are available within future issues of the publication. To view rates and opportunities please view our media pack by clicking HERE.
If you have a news story, article, case study or event which you’d like to tell our editorial team about please email firstname.lastname@example.org. Articles should act as opinion pieces and not directly advertise a company. Please note that the publication of editorial and advertising content is subject to the discretion of the editorial board.
Article by Sally Hudson, AGS Chair
I have always been in awe of the commitment shown by our AGS committee and Working Group members, or in fact by anyone in industry contributing to any extra-curricular activities over and above the ‘day job’. Ours is an often demanding and fast-paced way of earning a living, requiring an extra level of effort over the norm; to travel, undertake site work and meet deadlines. So this extra-over, as it were, must be recognised and gratitude is extended to practitioners and to Member companies that sanction the considerable amount of non-fee earning contributions made by staff to the AGS and other committees and industry bodies. This is how the AGS remains a not-for-profit Association and can divert resources where needed the most. We strive to provide opportunities to all those in the wider geotechnical and geoenvironmental industry for participation in all our activities. I am also grateful to all of our seminar and conference speakers for their gifts of time and expertise, which enable the AGS to fulfil this commitment to members. I will continue to drive and actively engage in these events.
The time committed to AGS activities is particularly impactful on businesses both this year and last, and our extra-curricular roles are being tested now more than ever, as we recover from the upheavals posed by the Covid-19 pandemic, by Brexit and by the unprecedented demands of HS2 investigations, enabling works and construction. I have spoken to representatives of many companies over the last few weeks and months, from consultants, main and specialist sub-contractors and from client bodies and asset owners, and the situation seems universal in that there is a shortage of quality candidates to recruit to permanent positions. This in turn has led to an increased pressure on the existing labour force. It has been well-reported that there is a national skills shortage in the UK, affecting several sectors and engineering is one of them. This matter has been predicted for some time and I am raising it here as I perceive it as a real risk to one of the core tenets of the AGS, that of a commitment to promote and enhance quality and safe practice. How do we find our way through to ensure a balance between fulfilling our commitments to clients and maintaining a high quality of work and improving on it? As the new AGS Chair, it is my responsibility to support and guide the Association activities to ensure that we provide benefit to all of our participants. I am pleased to report that we are already exploring several routes towards helping address the skills shortage crisis (and it is a crisis). We are working with academic bodies to promote awareness of this rewarding career among students in higher education and to explore potential apprenticeship routes. We are also in the process of consulting with those early in their careers and encouraging representatives into Working Groups to ensure refreshed thinking and to capture input from that group.
There is, for some, still a sense of being under-valued as a profession. Although in the long term this situation in which we find ourselves may improve our standing and recognition in the market place, we are already seeing an increase in remuneration packages required to attract candidates, a cost that will only have to be picked up by our clients. We are seeing costs of certain major infrastructure schemes escalating and although our front-end services are only a part of those costs, it is not hard to see how this could spread across all sectors. One of the powers of the AGS is that it has a voice, along with other collaborative industry organisations within Ground Forum, for Members to lobby Government on issues affecting our members and industry. Those companies that are not Member organisations of the AGS but who are active in the community and who use AGS data, please consider joining to assist in the promotion and enhancement of quality and safe practice within our industry.
Hopefully you have seen an increase in communication on what we do as an organisation to those outside of the AGS Committees during the term of my predecessor’s Chair tenure and I will continue to support this. This is my plea for your suggestions as to how we can improve or how you can assist: email@example.com.
Article provided by Danny Hope SiLC, Hydrock; Eric Cooper SiLC, Hydrock; and Liz Hart SiLC, Lithos
Since the initiative to promote brownfield regeneration through redevelopment and the requirement for local planning authorities to maintain a brownfield register, an increasing number of derelict and contaminated sites have been remediated and safely bought back into beneficial use. Available brownfield regeneration opportunities are now beginning to shift to consider historic landfills, where permits have been surrendered, and areas that were infilled prior to waste management controls.
This interest creates a fantastic opportunity to bring these sites back into beneficial use. It provides a much-needed opportunity to improve and enhance the environment whilst at the same time delivering new homes/places and enhanced employment opportunities for the benefit of the communities in which they are located. However, we are experiencing inconsistency as to how these sites are regulated via the implementation of current waste legislation.
There is an increasing insistence that remediation supporting redevelopment of these sites, reusing site won materials, should be managed under a deposit for recovery permit (Defra, 2009. Environmental Permitting Guidance. The Waste Framework Directive) rather than following well established land regeneration guidance. This approach is causing confusion and significant delays. Ultimately if a practical way forward is not identified, there is real concern that these brownfield sites will be blighted and passed over for development in preference for less challenging greenfield sites, due to the disproportionate regulatory burden.
Anthropogenic material found in historic landfill sites is often similar in composition to ‘Made Ground’ identified on many brownfield sites and can be both chemically and physically suitable for retention and reuse within the development. Unfortunately, the current approach is that if material is deemed to have been formally disposed of i.e., placed in a landfill (as opposed to made ground that may have been deposited across a site), it must be waste irrespective of its composition; even natural soils that have been placed in a landfill would be described as waste. Reuse of any waste can only be achieved under an environmental permit. Once something is classed as a waste, it must be assessed in line with WM3 and allocated a hazardous or non-hazardous waste code.
Remediation carried out under a planning permission embodies a ‘suitable for use’ approach based on generic and/or more detailed quantitative risk assessment – an approach adopted by the industry for many years. However, waste codes are allocated based on absolute concentrations, irrespective of site-specific risks. It follows that because thresholds for hazardous waste allocations are relatively low, material that is deemed suitable for use based on the site-specific risk assessment may be allocated a contradictory and barrier-inducing hazardous waste code
Once material is classified as hazardous waste there are further restrictions on how that material can be used;
- Hazardous and non-hazardous waste codes cannot be mixed;
- Different hazardous waste codes cannot be mixed; and
- Treatment of hazardous waste is restricted to 10 tonnes per day.
It is also an inaccurate assumption that hazardous waste can simply be remediated to non-hazardous thresholds; this is often simply not feasible with time, cost and technical constraints.
The treatment of waste deemed hazardous under WM3 is limited to 10 tonnes per day. The current alternative is the application for and implementation of an Installation Permit. In the context of most remediation schemes, this quantity is miniscule and the upshot is that another layer of bureaucracy is introduced, with contractors having to apply for permits that they have no experience of. The industrial Emissions Directive that drives this requirement was surely never meant to regulate land remediation works?
Once in place, environmental permits are detailed on the Environment Agency public register. Permits (whether live or surrendered) will then be identified during land conveyancing, again this is a deterrent to development with property being ‘blighted’ and final sales hindered. The surrender of an environmental permit can also be a lengthy and costly process, again steering developers towards an easier option.
Within a remediation and earthworks project, limiting the options for re-using physically and chemically suitable site-won material potentially increases off-site disposal which again reduces a site’s commercial viability.
The current approach to historic landfills also undermines the government’s ‘Brownfield First’ policy and could lead to local authorities not achieving their house building targets and / or decreasing the provision of employment opportunities regionally and nationally.
Moreover, the issues raised here may also contradict the government’s ‘levelling up’ agenda. Many of the aforementioned types of site are located in the midlands and the north where land values are such that viability can be a major barrier to regeneration, more so than in the south where land values tend to be higher and development opportunities more prevalent.
Restricting the reclamation of site-won material also directly opposes the drive for sustainable development, which is a core principle in the National Planning Policy Framework and even the Environment Agency has a core principle of improving the environment while promoting economic growth. Sustainability is also important in the wider context, we are a small Island, we must ensure we use available resources wisely.
It should be noted that UK industry is at the cutting edge of global remediation innovation, developing products which are exported around the world, a significant contributor to the UK economy. If re-development of brownfield sites becomes less prevalent, this innovation is likely to be stifled and income generated by the export of new technologies overseas will reduce.
Overall, it is unfortunately the case that aspects of the current regulatory regime are creating barriers to sustainable remediation and successful redevelopment of former waste disposal sites rather than facilitating it. No environmental or social benefit is accruing from the position currently being taken and there is no value in it beyond an unimaginative commitment to compliance.
CL:AIRE, with the support of the Environment Agency, has pioneered the sustainable re-use of materials via the Definition of Waste: Development Industry Code of Practice (DoWCoP) which has seen the beneficial re-use of millions of tonnes of earth across England and Wales, when the overarching EU Waste Directive threatened to stifle brownfield regeneration. SiLC and its members have always supported appropriate use of the DoWCoP and would like to ensure its continued and consistent use in line with the guidance and its overarching aim to promote sustainability and protection of human health and the environment.
We hope that a swift resolution can be found to these issues, with a clear and consistent way forward that does not stifle development opportunities, is protective of human health and the environment, encourages industrial entrepreneurship and innovation, but does not contradict government policies and site-specific approach to risk evaluation. Discussions between CL:AIRE, the Environment Agency, government and other experts has commenced and is ongoing. The SiLC PTP will also be adding its support to these discussions.
Full Name: Stephen Hugh Mallett (but known as Hugh since I was 10)
Job Title: Technical Director
Company: Buro Happold
I am a Chartered Engineering Geologist and Registered SiLC of forty five years professional experience. The first ten years focussed upon geological and geotechnical investigations in the UK and overseas. After a particularly rainy day on site in South Wales, I joined the civil service and spent over four years (in the dry) as a geologist in the Minerals Planning Division of the Department of Environment. In 1990, I joined the contaminated land team of an environmental consultancy (Aspinwall & Company) and have been involved in the investigation and assessment of land affected by contamination ever since (with Buro Happold since 2006).
What or who inspired you to join the geotechnical industry?
Courtesy of a friend in my village football team, I got a summer job as an assistant QS on the M5 construction near Weston Super Mare. On our stretch of the motorway, there was an impressive limestone cutting which was inspected / mapped by a geologist abseiling down the rock face. What more incentive does anyone need? And, many years later, I got to do this myself at Treffgarne Gorge, in Pembrokeshire. It was heaven.
What does a typical day entail?
The only thing that is typical is that there is no such thing. It is the variety of projects, the range of tasks to be undertaken and the lovely (and not so nice) people that I work with that makes me keep coming back for more. Although the majority of my days are spent in the office, I still love site work and get out whenever I can to do some “real work”. Perhaps the most typical aspect is that every time I think that I know the ground conditions on a site, then the uncertainty principle rears its head and something unexpected / unknown is encountered to make you realise (again) that you know nothing.
Are there any projects which you’re particularly proud to have been a part of?
Jordan Dead Sea Potash investigation. My first overseas project in 1977 – went for 6 weeks which turned into 9 months (it was called “Wimpey Time”). Learned to fly a hovercraft. Got rescued by a Jordanian Air Force helicopter on the Jordan / Israel border. Found live land mines (over 1000 eventually cleared from the site). Channel Tunnel Rail Link (HS1) contaminated land assessment in the early 1990s – really developed our understanding at the time. Writing R&D 66 and then delivering training on it to over 300 local authority contaminated land officers with some lovely colleagues and the legendary Bill Baker. The Olympic Stadium – cycling to site, spending the morning with our site engineer Gemma as construction happened and then cycling back to the office along the Grand Union Canal – I could not stop smiling. Devising and delivering the “Stratigraphic Beer Tour” lecture (on many occasions – invitations welcomed!).
What are the most challenging aspects of your role?
The continual need to keep up to date with the technical aspects of our work on contaminated land is double edged. It is really hard to do but also always keeps you on your toes, so work never loses its interest.
What AGS Working Group(s) are you a Member of and what are your current focuses?
I currently chair the Loss Prevention Working Group. It is a very active Group and has many very committed members who are always providing really useful advice and guidance through the various Loss Prevention Alerts, articles and the rather wonderful Loss Prevention Guidance, which is worth the membership fee on its own and is due to be reviewed and re-published in 2022.
What do you enjoy most about being an AGS Member?
Being part of an organisation that is concerned about raising the standards in our industry and which does something about it by the provision of useful (and used) guidance and advice.
What do you find beneficial about being an AGS Member?
I have been an active member of the AGS since the early 1990s (being a founder member of the Contaminated Land Working Group) and can honestly say that I have learned so much from that involvement – getting out far more than I put in.
Why do you feel the AGS is important to the industry?
I shudder to think where the industry would be without it. Think of the AGS Data Format, all of the technical and commercial advice and guidance, the support provided to all of the membership, the unselfish and collaborative behaviour of so many people.
What changes would you like to see implemented in the geotechnical industry?
At my first AGS meeting people talked about the need to raise the status of ground engineers. Sadly, despite initiatives such as SiLC and RoGEP, we are still often perceived as people grubbing around in mud who need little, if any, consideration and deserve little if any respect.
I have a dream: To see ground engineers knighted for their professional services, receiving the salaries of lawyers and obtaining the respect currently attributed to health professionals.
Article provided by Judith Nathanail (LQM), Geraint Williams (ALS), Mike Smith, Paul Nathanail (GHD)
“It’s not there!”
“You haven’t looked hard enough”.
Once the preliminary risk assessment is done, and volatile organic compounds (VOC) are contaminants of concern the sampling and analytical strategies need to reflect the ease with which VOCs can be lost from a sample resulting in a false negative analytical result.
In case you are wondering, a VOC is “any organic compound having an initial boiling point less than or equal to 250 °C (482 °F) measured at a standard atmospheric pressure of 101.3 kPa.”
Volatiles are lost rapidly if soil samples are left exposed. Losses of 25 – 50% have been recorded within 30 seconds of exposure. Sampling method has an even bigger effect – with losses of up to 99.9% recorded from bulk sampling. Where in situ VOC concentrations exceed an assessment criterion, such losses can result in false negatives, leaving behind unremediated soils or prematurely ending remediation.
BS 10175 recommends that samples intended for the determination of VOCs should be taken in a way that minimizes the loss of volatiles. The primary purpose of BS 10176 is to specify procedures that can be followed in the field to minimize loss of volatile organic compounds (VOCs) during sampling. These procedures need to be strictly adhered to in order to provide reliable and repeatable results.
The procedures described in BS 10176 are similar to those described in long standing guidance and standards across the world. The immersion methods require considerable time, resources, safe work practices, competent oversight and quality control.
The procedures involve taking a small sample of known weight and volume is taken using a coring device followed by either sealing the intact core or immersing the sample in a liquid to prevent losses through volatilisation in a subsequently sealed vial. BS 10176 describes procedures based on immersion in methanol, in sodium hydrogen sulfate (sodium bisulfate) (only for low VOC concentrations) or in de-ionized water. The core is then used directly in the laboratory without sub-sampling.
BS 10176 requires duplicate samples are taken from the same soil stratum and as close as possible to the location of the first sample to provide the laboratory with an additional sample in case re-analysis is required.
Soils up to coarse sand can be sampled. It is unlikely that samples representative of the in-situ VOC concentration can be obtained or tested from coarser soil fractions. For coarse gravel, cobbles, etc. alternative methods such as PID headspace screening or soil vapour sampling need to be adopted.
Standards like BS 10176 are drafted by working groups appointed by BSI’s Soil Quality Committee EH/4. EH/4 is responsible for developing British Standards in the fields of soil quality, soil pollution and contaminated soil. The committee contributes to European (CEN) and International (ISO) Standards. The EH/4 committee comprises representatives of relevant industry and academic bodies, learned and professional organisations and/or individual experts. Committee members volunteer their time and expertise to the development of standards. You can find out more at: https://standardsdevelopment.bsigroup.com/committees/50001294
The authors presented an introduction to BS 10176:2020 in a webinar in April – a link to the recording is at: https://attendee.gotowebinar.com/recording/5875920295717747975
Construction of basements beneath houses in central London remains a buoyant market, which is good news for the sector. Not so great, is the sad fact that building collapses still happen during basement works. The AGS Client Guide to Domestic Basement Construction has therefore been updated (to version 3) in order to emphasise more prominently the fundamental importance of adequate temporary works.
The temporary works play a crucial role in minimising potential damage to adjoining and adjacent properties, as well as the host building. Forward movement of the basement’s perimeter retaining walls must be resisted with high stiffness temporary and permanent props in order to minimise ground movements alongside the basement. The revised Guide notes that as the contractor is responsible for the design as well as the implementation of temporary works, clients must ensure that the appointed contractor has adequate in-house design expertise or that they employ a professionally qualified temporary works engineer. In both cases the temporary works designer should be able to demonstrate successful completion of other basement projects similar to the one being planned.
The revised guide can be downloaded from: https://www.ags.org.uk/item/client-guide-to-domestic-basement-construction/
Alex Lee, AGS Contaminated Land Working Group Leader, has provided an update on the top issues the Contaminated Land Working Group discussed at their last meeting which took place virtually in July 2021.
The AGS CLWG are currently in the process of revising A Client’s Guide to Desk Studies and Reference List. The CLWG are also in the final stages of producing A Client’s Guide to Geoenvironmental Reports, which is being reviewed by the group ahead of publishing.
At the last meeting, the CLWG discussed sustainability, which may lead to a sub-group to work collaboratively on looking at sustainable site investigations and providing advice to AGS members on this.
The CLWG have provided feedback on HSG248 and concerns from both CLWG and the AGS Labs WG were considered at the meeting. Representatives from the CLWG and Labs WG will continue to be involved with further discussions within the wider industry regarding this document.
Members of the CLWG are involved with a sub-group which is assisting with the review of ERES codes.
Working Outside Of The AGS
The AGS Contaminated Land Working Group have many members who are involved in a range of different projects and working groups; SAGTA C4SL project, the National Brownfield Forum, SiLC, SoBRA and more. This enables us to share new information within the Group but also relay the position of the AGS CLWG outside of the organisation.
If you interested in joining the AGS Contaminated Land Working Group, please contact the AGS Secretariat at firstname.lastname@example.org.
On 30th June, the AGS held their first webinar on the subject of laboratories, focusing on laboratory assessment and sampling practice. The event was sponsored by ALS Environmental and Geotechnical Engineering.
This webinar saw Will Fardon (AGS Laboratories WG Leader), Geraint Williams (ALS) and John Powell (Geolabs) investigate various aspects of sample submission, discussing best practice and guidance for how to get the most from the laboratory, the testing and some pitfalls to avoid. The event also covered different methods for assessing vapour intrusion and issues related to the quality and quantities required of laboratory samples for geotechnical testing to ensure representative Soil Parameters
This paid for event was rated 4.6 stars out of 5, by our 100 registered delegates.
If you missed this webinar, the replay is now live and available for view on the AGS website. The webinar costs £25 for AGS Members and £30 for non-Members (prices exclude VAT). Click HERE to view the replay and download the speaker presentations and file handouts.
Free download of the latest [April 2021] versions of the prENV Eurocode 7 for review and information. Any queries or comments should be addressed to the AGS representatives currently serving on the BSI B/526 Committee [Gary Evans] or [Chris Raison] or direct to BSI.