10 December Summary: Updating of the activities carried out on-site (Done) in NOVEMBER List activities on going (Next steps) and scheduled for DECEMBER Final consideration EHN1 civil engineering project status (NOVEMBER) 40 th EHN1 extension coordination & 10th EHN1 Detector integration meeting N.Lopez – M.Manfredi

Done (1/2): (1) PITS EXECUTION Excavation/Execution first ties level: (100% completed). Both pits done and in tension. Excavation/Execution second ties level: (0%=>100% completed). Pit B and in tension Internal DW surface Leveling / Reparation: (20%=>50% completed). Both pits ongoing. - Phase 4: step by step - (...). PIT A PIT B Pits ground excavation: (0%=>60% completed). Pit A done. Pit B ongoing. Pits’ lower drainage system: (0%=>40% completed). Pit A done. Pit B after excavation Pits’ slab system: (0% completed). Pit A first. 10 December EHN1 civil engineering project status (NOVEMBER) 40 th EHN1 extension coordination & 10th EHN1 Detector integration meeting N.Lopez – M.Manfredi

Done (2/2): (4) SLAB SYSTEM Swallow trenches execution: (0% completed). Jura side to start S1 S2 S3 S4 S5 -S4, S5 start in December after access ramp diplacement -S1, S2, S3, S6 ongoing - -S1, S2, S3, S6 - Backfilling between slabs: (0% completed). Upper slab concreting process: (0% completed). Earthworks allowing site preparation: (80%=>100% completed). Walls above DW’s crown beam, around pits: (0%=>50% completed). S6 Double slab and trenches drainage system: (0%=>50% completed). Lower slab concreting process: (80%=>90% completed). Remains part of S1&S3 10 December EHN1 civil engineering project status (NOVEMBER) 40 th EHN1 extension coordination & 10th EHN1 Detector integration meeting N.Lopez – M.Manfredi

Next Steps: Activities scheduled for December (3) PITS:  (B) Excavation up to the bottom level by mid-December. Levelling/Reparation follows until end-December.  (B) Installation lower drainage system by end-December + line concrete.  (A) Levelling/Reparation by mid-December. Execution slab system follows until end-December. (4) SLAB SYSTEM:  S4, S5 to start following pits’ access ramp displacement. Lower slab and drainage system by end-December.  Trenches on S2, S3 to start. Formworks and concreting process.. 07/12/201505/11/ December EHN1 civil engineering project status (NOVEMBER) 40 th EHN1 extension coordination & 10th EHN1 Detector integration meeting N.Lopez – M.Manfredi

Final Consideration: CE planning still in line with the 9 weeks of delay announced in November for the WP1 activity. Planning has been reviewed given priority to the execution of the pits (critical path). Following re-organization of some tasks and possibility of several superimpositions, contractors estimate to potentially retrieve 3 weeks at most. Thus, CE Handover is shifted by 6 weeks (half-August 2016), according to the new planning. Work site situation normalized after execution and defects reparation of the DWs complex. Minor reparation are expected now within the last portion to be excavated. Coordination of the CE integration issues (3D Catia model updating, ECR drafting/circulation, EL/CV services in the TG/Pumping station, etc..) will be finalized. Technical and on-site support to the MOE, coordination with CERN group, analysis/review of technical documents/drawings, weekly and monthly reports on-going. Next status of the works end-December. 10 December EHN1 civil engineering project status (NOVEMBER) 40 th EHN1 extension coordination & 10th EHN1 Detector integration meeting N.Lopez – M.Manfredi