GasClam

15Mar / 2015

3 ways continuous ground-gas monitoring saves you time

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Ground-gas monitoring programmes can hold up brownfield development. Spot monitoring periods can be prescribed for up to 12 months. Continuous monitoring can provide a solution to this.

Continuous monitoring involves the use of unmanned data collection instrumentation. There are many benefits to collecting continuous data, including improved risk prediction, but continuous monitoring also saves you time. Here’s how:

17Feb / 2015

What does continuous monitoring mean?

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Continuous ground-gas monitoring is a popular method for certain situations (see previous article on ‘when to use continuous ground-gas monitoring’).

This article tries to answer the question: what does continuous really mean in the context of ground-gas monitoring?

The Oxford English dictionary defines continuous as: Forming an unbroken whole; without interruption.

Traditionally, the contaminated land industry has relied on ground-gas monitoring results collected at a frequency of 1-2 weeks.

06Feb / 2015

Ground gas flow and continuous monitoring

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Ground-gas flow and continuous monitoring

I’m often asked: Does GasClam® measure flow?

This article attempts to answer this question and highlights the reasons why flow measurements may sometimes be misleading.

“No…”

GasClam® does not measure flow. In order to measure flow directly, a valve must be released which allows ground-gases (or air) to move from borehole to atmosphere, or vice versa. GasClam® is sealed into a monitoring well throughout monitoring and therefore no gas flow passes from ground to air. Options are available to intermittently release gas to the air, rather than recirculate to the borehole, but flow is not recorded as it passes through.

30Jan / 2015

When is continuous ground-gas monitoring beneficial?

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Continuous ground-gas monitoring can be a powerful tool in better understanding the ground-gas regime. However, it is not always necessary and sometimes we can figure out what we need to know through comparing periodic monitoring data with our Conceptual Site Model.

This post sets out some of the situations where continuous ground-gas monitoring may be a good option.

23May / 2011

GasClam specification

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GasClam® specification

The GGS GasClam® instruments are serviced and calibrated annually.  Routine maintenance including the replacement of filters and seals. Operational checks are carried out at regular intervals and prior to deployment at a site. 

23May / 2011

GasClam Data – Why Regulators Like It

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Conventional ground-gas monitoring data is at best a tabulated collection of snap-shots in time. As such it is susceptible to huge degrees of error with the worst case either not captured at all or poorly characterised.

23May / 2011

GasClam®: Buy or Hire?

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GasClam® is a beautifully designed piece of equipment. It is designed to fit inside a standard ground-gas monitoring well and continuously monitor both the ground-gases and the environmental parameters that influence those gases. However, it is the GasClam® data and the confidence that can be placed on its interpretation that is valuable.

23May / 2011

GasClam Development

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Simon Talbot, the founder and managing director of GGS, was previously the Director of the GMGU; a local authority technical support unit based at the University of Manchester. In this role Simon carried out teaching, training and research activities on contaminated land issues with a particular focus on the monitoring and risk assessment of ground-gas contamination.

21May / 2011

Uses & applications

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GGS currently has three versions of GasClam®: A bulk gas version which monitors methane, carbon dioxide and oxygen; a trace gas version which also includes sensors for hydrogen sulphide, carbon monoxide and total volatile organic compounds; and a specialized instrument that can monitor methane and carbon dioxide between 0 – 5%v/v at a high resolution of 0.05% in addition to the other gases.

21May / 2011

What is GasClam?

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GasClam® is an in-borehole ground-gas monitor, providing unmanned data collection of ground-gas concentrations.  It collects data of high temporal resolution, sampling at frequencies as high as three minute intervals.