19 February Extension of Building Neutrino Platform General Meetings N.Lopez – M.Manfredi EHN1 civil engineering project status Summary: Updating on the activities completed (Done) since the last meeting List activities on going (Next steps) and related Actions

Extension of Building Neutrino Platform General Meetings N.Lopez – M.Manfredi EHN1 civil engineering project status 19 February (5 th week) Concrete blocks removal, cores for water and electrical connections through existing EHN1 completed. (4 th week) “Visite d’Inspection Commune” (VIC), for the earthworks and worksite installation, Permit to dig issued by CERN to the contractor. Earthworks contractor on site. Done (1/4): Site work side

Extension of Building Neutrino Platform General Meetings N.Lopez – M.Manfredi EHN1 civil engineering project status 19 February (5 th week) Ground surveys to determine own features (top soil thick, water table depth..). Septic tank survey and site entrance area arrangement (5 th week) Existing networks research. Valve installation by SIG on the potable water network. Done (2/4): Site work side

Extension of Building Neutrino Platform General Meetings N.Lopez – M.Manfredi EHN1 civil engineering project status 19 February (6 th week) All week snow. Site Activities stopped due to the weather conditions Done (3/4): Site work side (7 th week) Snow removal, start top soil excavation (about 30-50cm), platform for site barracks creation.

Extension of Building Neutrino Platform General Meetings N.Lopez – M.Manfredi EHN1 civil engineering project status 19 February (7 th week) Existing drainage network research, concrete manhole installation, trench for service connection and top soil excavation completion (Transport toward storage area completed this week) Done (4/4): Site work side

Extension of Building Neutrino Platform General Meetings N.Lopez – M.Manfredi EHN1 civil engineering project status 19 February Done (1/1): Design and study side (issued 05/02) Final comments on the execution docs (issued 05/02) sent by CERN to the consultant. Awaiting for the updated version before the EDMS uploading. (issued 12/02) RP issue, additional soil thickness needed above the tunnels. Structural evaluation due to the overload and reference plan with new requirements provided to the Contractor (issued 12/02) (completed 16/02) “Etat des lieux” on the existing facilities (i.e. EHN1, underground tunnels TT84- TT85-TDC85, Roads and Storage Area). (completed 16/02).. Weekly site meeting + Coordination and Neutrino General meeting

Extension of Building Neutrino Platform General Meetings N.Lopez – M.Manfredi EHN1 civil engineering project status 19 February Next Steps (on going and awaiting submission) Analyse Plan and Execution Method about the existing facilities instrumentation (i.e. topographic and cracks monitoring, vibration measure and inclinometers) and Technical Gallery portion in front the TDC85 enlargement (on going and awaiting submission) (on going) Analyse Plan and Calculation Notes received for the Diaphragm Walls and Sheet Piles execution (on going) (foreseen 8 th  11 th week) (foreseen 8 th  11 th week) Topsoil excavation removal General Site installation and access road completion Mass earthworks until the DW level upper part Site installation for the Special works contractor (DW +SP) Guide walls construction for DW excavation purpose Start DW excavation (drilling west side)