Welwyn Garden City chalk mines spark gas mains risk fear

PUBLISHED: 13:20 04 September 2011

The subsidence on Daniells

The subsidence on Daniells


AT least £135,000 is needed to temporarily stop further “catastrophic” subsidence in a WGC road – money which Welwyn Hatfield Council does not have.

Remedial works are needed in the “very near future” to prevent underground collapsed chalk mines from potentially BLOWING up the gas mains, damaging sewage services, and swallowing up any more of Daniells’ highway.

A report, which is due to be shown to Welwyn Hatfield Council’s cabinet on Tuesday, suggests the council should find funding from the Homes and Communities Agency to prevent the ground moving any further.

This includes £35,000 for further investigations into chalk mines in gardens in nearby Stoneycroft and Daniells, and in excess of £100,000 for remedial works.

The report says the cost would not be covered by Herts Highways, as it is only responsible for the road surface.

On Tuesday the council will also hear how the main subsidence site lies within an area with a “high density” of holes and the report shows records of at least two historical chalk mines within a 500m range.

It also states the main subsidence in the road, which caused “catastrophic” structural damage to one house and saw 70m of the road closed off for investigation, was caused to due to “disturbed ground conditions” and “underlying chalk” 22.5m underground.

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