1. Contract with UKPN awarded to J. Murphy (&) Sons on 28 September 2011 2. Site preparation works 10 October 2011 3. Shaft sinking at Brentfield Park commenced in December 2011 4. 100m of high level 2.44m ID bolted Et grouted tunnel was constructed from February to April 2011 5. Brentfield Park shaft constructed to full depth of 30m and temporary works for TBM launch (i.e. backshunt and forward eye) formed in SCL from May to July 2012.
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