Location
France / Europe
Project record
Granville Herel main breakwater and sill-wall repair
Departement de la Manche launched repairs to the Herel marina's 360-metre main breakwater and sill wall on 25 August 2025 after a 2022 diagnosis found reinforcement corrosion, about 1,850 m2 of concrete spalling and 2,100 linear metres of cracking. BOAMP award notice 25-51135 identifies contract 2025-25136, a EUR 5,897,585 payable amount, two tenders and Entreprise Marc SA as the published titulaire. The owner separately names a three-company delivery group of Marc SA, NGE Genie Civil SAS and ETPO Normandie, gives a rounded EUR 7.1 million project amount and targeted end-May 2026 acceptance after nine months. A completion certificate or owner acceptance notice is absent from the cited current sources.
Segment
Breakwater and reinforced-concrete marine-structure rehabilitation
Status
The owner-confirmed nine-month repair started on 25 August 2025; its planned end-May 2026 acceptance window has passed without a published completion certificate, handover or final account / Confirmed
Last checked
7 August 2026
Coverage
Related sectors
Breakwater and reinforced-concrete marine-structure rehabilitation is the primary work classification. Related sectors connect this record to adjacent marine delivery and market coverage.
Subject index
Related subjects
These subject pages bring together related projects, technical articles, reports, and evidence methods.
Project anatomy
Contract scope and delivery roles
- Client / authority
- Departement de la Manche, owner of the departmental Port de Granville
- Delivery parties
- Entreprise Marc SA - BOAMP-published titulaire and owner-named delivery-group member, NGE Genie Civil SAS - owner-named delivery-group member, ETPO Normandie - owner-named delivery-group member, Unnamed rope-access subcontractor - BOAMP discloses EUR 250,000 for reinforced-concrete cleaning and patch repair but no legal name
- Contract route
- Open works procedure under BOAMP notice chain 24-142391, 25-3691, 25-17999 and 25-51135. The award record reports two tenders, contract 2025-25136, a 7 April 2025 contract-issue field and a EUR 5,897,585 payable amount. It names Entreprise Marc SA as titulaire; the owner's later start notice describes Marc SA, NGE Genie Civil SAS and ETPO Normandie as the works group. The two records are preserved rather than forcing the owner group into BOAMP's single published winner field.
- Execution window
- The owner says site activity began on 25 August 2025 and set a nine-month programme with acceptance planned for the end of May 2026, excluding weather delays. Work was to proceed mainly from rope access and four mobile gantries, with divers supporting marine interfaces and a tower crane established from the Herel parking area. The planned acceptance date has passed; no cited source confirms actual completion, sectional release, formal acceptance or demobilisation.
- Works package
- Clean reinforced-concrete surfaces, remove unsound material, patch spalled concrete, inject cracks, treat fractures and apply a waterproof protective coating to the main breakwater and sill wall. The main breakwater comprises 52 Jarlan caissons approximately 14 metres high over about 360 metres. The 2022 SITES diagnosis reported corrosion, approximately 1,850 m2 of concrete spalling and 2,100 linear metres of cracking across the sill wall and two breakwaters; the published contract addresses the main breakwater and sill wall.
- Marine interfaces
- An operating marina, tidal exposure, 52 perforated Jarlan caissons, exterior and internal concrete faces, rope-access teams, four gantries, diver access, tower-crane logistics, pedestrian exclusion and weather downtime form one delivery system. Repair quantities must be tied to accessible faces and accepted treatments rather than inferred from the diagnosis totals.
- Commercial evidence boundary
- BOAMP records a EUR 5,897,585 award amount, while the owner gives a separately rounded EUR 7.1 million project statement. The two figures are separate baselines; neither their sum nor their difference establishes a variation. BOAMP discloses EUR 250,000 of known subcontracting for rope-access cleaning and concrete patch repair without naming the subcontractor. The value split among Marc, NGE and ETPO remains undisclosed, and the owner release omits payment, measured repair quantities, variation and final-account data.
Contract and delivery chain
Named roles and open packages
Named appointments are shown against the workstream they cover. Unallocated packages remain open until a project source identifies the responsible party.
Main works contract
2025-25136 main breakwater and sill-wall repair
- Named party
- Entreprise Marc SA as BOAMP titulaire; Marc SA / NGE Genie Civil SAS / ETPO Normandie as owner-named group
- Status
- Confirmed
- Source position
- BOAMP reports the contract, EUR 5,897,585, two tenders and Marc as titulaire; the owner identifies the three-company works group. Source
Field delivery
Concrete cleaning, patch repair, crack and fracture treatment, and waterproof coating
- Named party
- Works group under Departement de la Manche
- Status
- Confirmed
- Source position
- The owner's 1 September 2025 release records a 25 August start, nine-month programme, rope access, four gantries, divers and tower-crane installation. Source
Known subcontract
Rope-access reinforced-concrete cleaning and patch repair
- Named party
- Legal subcontractor name not published
- Status
- Reported
- Source position
- BOAMP discloses EUR 250,000 of subcontracting and the work scope but does not disclose a legal name. Source
Completion and acceptance
Accepted repairs, defects, handover and final account
- Named party
- Owner, engineer and works group
- Status
- Not evidenced
- Source position
- The owner's planned end-May 2026 acceptance date has passed, but no cited current source confirms actual completion, acceptance, defects close-out or final account.
Project timeline
Material developments
Dated events that changed scope, counterparties, delivery, commissioning or operating status.
Open this project in the Change LogPlanned acceptance remains unconfirmed in the current owner archive
The end-May 2026 target is past, but the reviewed owner press archive contains the 2025 start notices and no later completion or acceptance record.
SourceOwner published the field-start and three-company delivery chain
Departement de la Manche named Marc SA, NGE Genie Civil SAS and ETPO Normandie, described the methods and targeted acceptance at the end of May 2026.
SourceRepair work started at Herel
The owner records the physical site start, a nine-month planned delivery period and an end-May 2026 acceptance target subject to weather.
SourceBOAMP published the contract result
Notice 25-51135 confirms Entreprise Marc SA as titulaire, EUR 5,897,585, two tenders and the known EUR 250,000 subcontract scope.
SourceBOAMP records the contract-issue field
The raw award record identifies contract 2025-25136 and 7 April 2025 while its unrelated 1 January 2000 award date is excluded as invalid.
SourceSITES diagnosis quantified concrete deterioration
The owner reports reinforcement corrosion, about 1,850 m2 of spalling and 2,100 linear metres of cracking on the sill wall and two breakwaters.
SourceEvidence gap
What remains unverified
Outstanding evidence
- Owner or engineer completion and acceptance certificate after the missed end-May 2026 publication window
- Measured patch-repair area and injected crack length versus the 2022 diagnosis
- Waterproof protective-coating completion and treated-face coverage
- Condition and closure records for all 52 Jarlan caissons and the sill wall
- Diver, rope-access, gantry and tower-crane demobilisation
- Identity and delivered scope of the EUR 250,000 rope-access subcontractor
- Weather extensions, variations, payment and final account
- Pedestrian reopening, defects period and owner maintenance responsibility
Sources and related records
Read featured analysis Methodology Submit a correction Project tracker
Source collections
Project sources 5
- BOAMP result notice 25-51135 for Port de Granville Herel Bulletin officiel des annonces des marches publics / DILA, 7 May 2025
- BOAMP open-data record for notice 25-51135 Direction de l'information legale et administrative, Record reviewed 7 August 2026
- Port de Granville: start of the Herel breakwater repair Departement de la Manche, 1 September 2025
- Herel breakwater works press release Departement de la Manche, 1 September 2025
- Invitation to the Herel breakwater repair start Departement de la Manche, 25 August 2025