CENF CIVIL ENGINEERING UPDATE :

- SITE INVESTIGATION - CALL FOR TENDER FOR DESIGN & CONTRACT ADMINISTRATION SERVICES

John Osborne GS/SE 16 May 2013

Site investigation for Near Detector and Target Area will be complete by end of May

• Pumping tests have indicated that C12 (Near Detector) is in liaison with the ‘Lion’ Stream.

Tender documents :• Updated list of firms from MS• Instruction to Bidders• Technical Spec including :

• Descriptive• Deliverables for the phases• Safety Rules• Drawings• Geology

• Risk Matrix• Conditions of Contract• Tender Form• “Best Value for Money” Questions

& Criteria (50%/50%)• etc

Call for tender for CE Design and Contract Administration

Phases of Services

• Phrase added top have a ’hold’ point after each phase to allow contract termination after any Phase

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Key Dates (1)

• Specification Committee Monday 29 April. HSE & Legal Service consulted at the same time. Second meeting held Friday 3 May.

• Technical documents complete

• Documents will be send around for final comments this week

• Target date for Bidders Conference is Mon 10 June•  • Target closing date for receiving bids is day 28 June

• Special FC Approval in July (Accelerated Procedure required including Peers Review)

Near and Far Buildings :• Tender Design (Phase 1) complete by October 2013 (over summer months !)

• Construction Design (Phase 2) complete by end of 2013• CE construction works early 2014 – early 2015

Target areaTender Design (Phase 1) complete by March 2014• Construction Design (Phase 2) complete by July 2014• CE construction works mid 2014 – early 2016

*Junction cavern, extraction tunnel and service bld dates to be confirmed*Input from all CERN services needed to allow this firm to do detailed civil design (CV,EL, Access, Cranes etc)

Key Dates (2) (+1 month ?)November

SPARES

CATIA CE model of North Hall nearly complete for Integration

Bld 887 L.Faisandel GS/SE

CENF geological survey findings

• Completed borings up till 30 April 2013: C11-C14 (near detector area)

Stratigraphy C11 and C12• 0.2m-1.2m topsoil and backfill • 1.2m to 8.0m Wurmian Moraine (clays, silts)

• Consolidated• Intra-moraine units (marly, sandy, gravely), maximum thickness of 2.2m

• Partially saturated → excavation in wet conditions• Between 6.0m and 13.0m gravels

• Compacted• Aquifer → pumping tests will be carried out to determine the properties of the aquifer

• From13.0m up to 20m Rissien Moraine

Stratigraphy C13• Entire borehole consists of Moraine, except for an intra-moraine marly and gravely unit at 5.0 – 7.2m depth

• Marly unit partially saturated → excavation in wet conditions• Aquifer in gravels

Stratigraphy C14• Entire borehole consists of Moraine, except for an intra-moraine marly and gravely unit at 5.0 – 7.2m depth

• Partially saturated → excavation in wet conditions• No well defined aquifer, but some water inflow has been noted

Initial conclusions• Geology is very heterogeneous • Groundwater levels are variable