LQM is a specialist environmental consultancy based in Nottingham (UK) with an international reputation for assessing and managing the risks posed to human health and the environment by contaminants in soil. Increasingly this is being done within a context of sustainable development and specifically sustainable brownfield regeneration.
We provide consultancy, peer review and expert witness services, contract research and training courses on all aspects of the management of land contamination to problem holders, developers and local government.
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The risks posed by ground gases are commonly assessed based solely on calulated Hazardous Gas Flow Rates or Gas Screening Values for methane and carbon dioxide to assign a Characteristis Situation to the site; CS1 represents a very low risk and CS6 a very high risk. However, this approach on its own takes no account of the source and/or composition of the ground gas that was encountered.
Ternary plots provide a simple graphical approach to examining the composition of the ground gases encountered at a site and investigating the potential for differences in the nature and source of the gas encountered at different locations and areas. Such information can help to further characterise the ground gas regime, differentiate between potential sources and provide additional lines of evidence to support the Conceptual Site Model for ground gases at the site (gCSM). The plots can also be used to identify when carbon dioxide concentrations above 5% are likely to pose a low risk and do not warrant the increase from Characteristic Situation CS1 to CS2 discussed in BS 8485. The use of ternary plots for interpreting ground gas data is discussed in Ground Gas Information Sheet No1 (Wilson S, Collins F & Lavery R, 2018)
Examples of Tool Outputs:
1. Use of the software represents acceptance of the Licence Agreement, which is also contained within the software. Please review the Licence Agreement prior to use.
2. For organisations with multiple offices, a seperate copy of the software is required for each office (we will email you for offices to register after your order).
3. The software will be delivered via email only once payment has been received.
Prices and Discounts:
Ternary plots are commonly used to allow interpretation of ground gas monitoring results. There are various ways of plotting data in ternary graphs. The use of ternary plots for interpreting ground gas data is discussed in Ground Gas Information Sheet No1 (Wilson S, Collins F & Lavery R, 2018) .
The LQM Ternary Gas Composition Tool is a simple to use spreadsheet (Microsoft Excel is required to use the tool) that allows three different ternary plots to be quickly and easily generated from both manual spot monitoring data and automated high frequency ('continuous') gas monitoring data. As a minimum, methane (%), carbon dioxide (%) and oxygen (%) data is required, but where available nitrogen (%) can also be entered. Based on this data, the Tool automatically plots the three different ternary plots discussed by Wilson, Collins & Lavery (2018). Optionally, illustrative or indicative areas potentially representing microbial aerobic degradation of organic matter, migration/dilution of landfill gas and/or mixing of gases of geogenic origin (e.g. Coal Measures) can be superimposed on this data to help with interpretation. For complex data sets, the Tool also allows you to explore different subsets of the data within these plots using upto 5 filter field (eg representing shallow/deep wells or different site zones, or differnt geological strata).
The resulting plots may be used within your reports on condition that the copyright statement, etc. is not obscured or removed. These plots can help to indicate the likely gas source(s) and migration pathways that may be present, which can provide additional lines of evidence to support the gas conceptual site model and gas risk assessment for the site. The plots can also be used to investigate when carbon dioxide concentrations above 5% are likely to pose a low risk and do not warrant the increase from Characteristic Situation CS1 to CS2 discussed in BS 8485.
The price includes personalisation of the tool with your company name or logo. Once the order has been received we will contact you (at the email address given in the account from which the order originated) with instructions on how to supply a suitable image file and indicate which office or offices (for multiple copy orders) are to be licensed. We will replace the LQM logo (but not the copyright statement) on both charts with the image file you provide.
Once payment has been received the personalised tool will be delivered by email to the address given in the account from which the order originated.
Are all the PAHs at your site from a single source or are there different sources in different areas? What might these sources be and what might that tell us about the potential risks they present? This simple tool allow you to investigate your site data and find out.
Recorded demo showing you how to add and view your Site borehole logs within your QGIS project (12 minutes).
The latest version of our very popular manual providing assessment criteria used in human-health risk assessment of potentially contaminated sites.
Recorded demo showing you how to use QGIS to zone your site using human health risk assessment criteria for contaminant datasets (18 minutes).
Recording of Professional Practice Webinar to help understand the chemical hazards, risk assessment and remediations for clandestine substances, originally delivered 16th January 2019 (~60mins).