Well, it could be a kind of marsh gas which is being channelled from some
way away. I'm not convinced that everyone knows what is under the ground
when they build in any case. Land fill is not a new idea after all.
However, most naturally occurring gas has no odour whcih is why its
dangerous, so if you can smell it it needs to be looked at just in case its
some old pocket of gas leaked there some years ago.
Brian

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From the Sofa of Brian Gaff Reply address is active
"Harry Bloomfield" wrote in message
. uk...
They have dug the same bit of pavement up repeatedly over the last 12
months, I have reported the smell twice, but the cannot find a leak from
their new pipes. It smells like gas, rather than a sewage leak but they
have had the water people out to check and nothing found. They have had
the smell analysed and its not their gas....

So what could it be?

Its an 18th and 19th C mining area, might it be gas rising from the old
mines? They say mines would be too deep...

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk