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Chalk it up

Letters

Your reference to the high cost per kilometre of the Coulsdon bypass (NCE 22 June) is perhaps a reection of the standards adopted.

At the northern end of the site an existing 1m high wooden fence has been removed to be replaced - it is understood - by a 1.5m high wall. This has necessitated digging a 2m deep, 2m wide trench.

On this has been cast the wall foundation, which is of reinforced concrete 1m wide and 1m deep - the sides of which have been carefully brushed with bitumen.

Needless to say the ground is good chalk.

I await further developments.

Francis Walley, 13 Julien Road, Coulsdon, Surrey, CR5 2DV

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