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Satisfactory use of slate as sub-base

Letters

I have read with interest your article 'Alfred McAlpine to use slate waste as road sub-base' (NCE 2 May).

As I was Hyder Consulting geotechnical engineer on site for two years during the construction of the new A55 across Anglesey, I should point out that slate sub-base was not used on the main A55 in Anglesey.

The only areas where slate sub-base was used were at a limited number of side roads near the Llanfair PG end of the route (nearest to the Menai Strait).

The sub-base under the A55 in Anglesey consisted of limestones, granites and gneisses, sourced from site won materials, and local quarries.

However, where used, slate sub-base performed satisfactorily.

Sergio Solera (M), principal geotechnical engineer, Hyder Consulting, Firecrest Court, Centre Park, Warrington WA1 1RG

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