Keiron
Finney MSc MRSC MCIWM CChem CSci CEnv CWMan, Grad IOSH
Environment
Agency
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Alex
Hydrogen or ethane in the well
can be recorded as carbon monoxide.
Have you carried out lab testing
on gas samples to confirm it is CO?
Then look at conceptual model –
is there a source of CO? Low levels can be produced by nacent hydrogen
reacting with metals in the soil. In this case – probably low risk, but
you can check by looking at the chemical equations and working out how much is
likely to be produced.
Is there a higher risk source –
smouldering underground fire in a landfill?
Finally use the data you have to
model migration into the proposed development and compare against the values
quoted by Adam. You can then modify the analysis to show the benefit of
any gas protection (eg a ventilated void)
You should be able to
demonstrate whether it is an unacceptable risk or not.
Steve Wilson,
Technical Director
on behalf of
EPG
Tel 07971
277869
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From:
Contaminated Land Management Discussion List
[mailto:[log in to unmask]] On Behalf Of Adam
Czarnecki
Sent: 31 March 2011 16:06
To:
[log in to unmask]
Subject: Re: Carbon
Monoxide
Wikipedia has
this;
Concentration |
Symptoms |
35 ppm
(0.0035%) |
Headache
and dizziness within six to eight hours of constant
exposure |
100 ppm
(0.01%) |
Slight
headache in two to three hours |
200 ppm
(0.02%) |
Slight
headache within two to three hours; loss of
judgment |
400 ppm
(0.04%) |
Frontal
headache within one to two hours |
800 ppm
(0.08%) |
Dizziness,
nausea, and convulsions within 45 min; insensible within 2
hours |
1,600 ppm
(0.16%) |
Headache,
tachycardia,
dizziness, and nausea within 20 min; death in less than 2
hours |
3,200 ppm
(0.32%) |
Headache,
dizziness and nausea in five to ten minutes. Death within 30
minutes. |
6,400 ppm
(0.64%) |
Headache
and dizziness in one to two minutes. Convulsions, respiratory arrest, and
death in less than 20 minutes. |
12,800 ppm
(1.28%) |
Unconsciousness
after 2-3 breaths. Death in less than three
minutes. |
From:
Contaminated Land Management Discussion List
[mailto:[log in to unmask]] On Behalf Of Alex
Smiles
Sent: 31 March 2011 15:56
To:
[log in to unmask]
Subject: Carbon
Monoxide
Just a quick one, have been attempting to
locate some guidance re: assessment of risk posed by elevated concentrations of
Carbon Monoxide ground gas.
We have a site which has been reporting
levels ranging between 200 and 400ppm and I have turned up a blank in the usual
places (CIRIA 665 etc) regarding the assessment of risk posed. Gas flow
rates have been reported around 2l/hr during varying atmospheric conditions
including falling.
Would be interesting to know if anyone has
dealt with CO and what guidance is available to evaluate
risks.
Thanks
Alex
Alex
Smiles
Senior
Geo-environmental Engineer,
On
Behalf of RoC Consulting
T: 0161
833 9737
F: 0161
834 5619
M:
07790 548596
RoC
Consulting Ltd, Studio B Commerical Wharf, 6 Commercial St, Manchester, M15 4
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