1. General Infrastructures Services Department Civil Engineering planning for LSS4 Option, presented at review workshop 30/7/2014 20 months Planning and Resources: ( * ) The resources given in this table are over and above the existing resources currently in GS-SE Group LSS4 Option : Approx. 80m long cavern, 11m wide John Osborne GS-SE 18 December 2014

2. Civil Engineering planning for BA5 Option to be studied in more detail once layout is more mature and specialist company awarded contract for detailed analysis ProsCons Better Shaft AccessFairly complex layout with variable excavation profiles No demolition of existing tunnel Long excavation with single access point John Osborne GS-SE 18 December 2014

3. ActivityDuration (months) Set-up site underground (ventilation, electricity, dust protection, stitch drilling of tunnel opening) 1 Typical advance rate for excavation at LHC for small galleries like this 10-15 linear meters per week (eg 50m long LHC UPS survey galleries at CMS took 1 month for excavation) 4 Dump Cavern (similar to RR caverns for LHC) 1 month excavation, 2 months lining3 Junction Tunnel / Shielded Alcove 1 month excavation, 1 month lining2 Junction Cavern 1 month excavation, 1 month lining2 Tunnel floor, drainage 25m per week2 Secondary lining of Dump and Connection tunnel, 25m per week2 Finishing works2 Total Construction timeApprox 18 months for CE Core drilling 1 month (not on critical path) Other works for CV, EL, crane installation etc not considered No contingency float in this draft schedule Some very first thoughts on SPS5 critical path activities : John Osborne GS-SE 18 December 2014

4. Drainage collector sump at bottom of ECX5 shaft Stitch drilling of tunnel opening (not really gaining much time for the disruption) Rock bolts in SPS (not on critical path) Possible preparation works in 2016/2017 winter stop : John Osborne GS-SE 18 December 2014

5. BACK-UP

7. Some Photos from TT41 core