Création d'un doublet de forage pour l'installation d'une géothermie sur nappe du Centre Sportif Alain Estève et du Baf à Meung Sur Loire (45)

The contract timeline includes a duration from the date of notification until the completion of the perfect completion guarantee period. A contractual calendar for the realization of two tranches (firm and optional) will be established and signed before the start of works. The optional tranche will be confirmed by a service order within a maximum of 3 months after the reception of the firm tranche. The execution period for drilling is scheduled for early November 2026. The overall execution deadline is determined by the service order initiating the work for each tranche. Tests can be conducted outside school holidays.

Key milestones and phases with provisional dates are also outlined:

• Validation APD: September 2026 - October 2025
• Depot PC délais d'instruction: October 2, 2026 - March 8, 2027
• Etude de projet (PRO): October 2, 2026 - November 20, 2025
• Validation PRO: November 21, 2026 - December 4, 2026
• Appel d'offre: December 5, 2026 - January 28, 2027
• PHASE DE TRAVAUX N° 1 Forage isolation du comble vestiaires 1980-menuiserie: October 5, 2026 - November 6, 2025
• DATE LIMITE POUR LE DEMARRAGE DES TRAVAUX - Subvention FEDER: November 10, 2026 - November 10, 2025
• Assistance à la passation des contrats de travaux (ACT): January 29, 2027 - February 23, 2027
• Notification des marchés de travaux avec mois de préparation: February 24, 2027 - March 22, 2027
• Signature des OS Démarrage des travaux: March 23, 2027 - March 23, 2027
• PERIODE DE PREPARATION: March 29, 2027 - May 5, 2027
• PHASE DE TRAVAUX N°2: May 3, 2027 - September 27, 2028
• Extension du BAF: May 10, 2027 - December 30, 2027
• Travaux rénovation intérieur BAF (équipement fermé): May 31, 2027 - January 20, 2028
• Utilisation du bassin extérieur: May 31, 2027 - September 24, 2027
• Location d'un camion BAF mobile: September 25, 2027 - January 19, 2028
• Toiture gymnase (fermeture de l'équipement): June 6, 2027 - August 14, 2027
• Extension gymnase (local stokage tir): November 15, 2027 - April 11, 2028
• Electricité/Chauffage et ventilation gymnase (fermé): July 1, 2027 - August 14, 2027
• Menuiseries extérieures/polycarbonate gymnase (fermeture de l'équipement): August 9, 2027 - August 27, 2027
• ITE façades gymnase (équipement ouvert): September 5, 2027 - November 8, 2027
• Vestiaires gymnase 1970 création du hall: September 5, 2027 - December 9, 2027
• Toiture vestiaires gymnase: September 5, 2027 - October 1, 2027
• Déménagement des agrès vers la salle multi activité: October 9, 2027 - October 22, 2027
• Dojo/Agrès (équipement fermé): November 9, 2027 - April 20, 2028
• Déménagement des agrès: April 21, 2028 - May 4, 2028
• Salle multi-activité (salle fermée): May 5, 2028 - September 27, 2028
• Toiture extension 1999 (fermée): June 20, 2028 - August 4, 2028
• Voirie et aménagements extérieurs: June 24, 2028 - August 4, 2028
• Electricité/Chauffage et ventilation extension 1999 (fermé): July 3, 2028 - August 14, 2028

The core scope of work for this tender, "Gymnase - Création d'un doublet de forages sur nappe," involves the establishment of a double drilling system on a water table. The project is structured into a firm tranche and optional tranches.

The high-level summary of the Statement of Work and core deliverables includes:

• Installation of the Construction Site: This encompasses the preparation, transportation, setup, and dismantling of all necessary equipment and personnel, including the provision of power and water, management of discharge water, evacuation of drilling debris, and final site restoration.
• Drilling and Equipment: The creation of a test well (injector) in the firm tranche and a second well (producer) in optional tranche 1. This involves drilling to specified depths (0-50m) using methods like hammer drilling, conducting flow estimation, and performing debit-metric, Gamma-ray, and resistivity profiles. It also includes boring (re-drilling) to precise diameters and installing full steel casing and wellheads with flanges.
• Development: This phase covers the installation and removal of equipment such as double column air lift emulsifiers and submersible pumps, followed by cleaning using air lift and clear water, and development pumping. An optional tranche includes development by acidification, involving the injection of hydrochloric and sulfamic acids, agitation, and further cleaning and pumping.
• Test Pumping and Injection Tests: This crucial stage involves conducting various pumping and injection tests, including stepped and continuous operations over 24 hours. Deliverables include continuous monitoring of flow rates, water levels, and fine particle presence, along with nitrate analysis. This also requires the recording of water levels in the tested and monitoring wells.
• Miscellaneous Services: This category covers administrative and compliance tasks such as GMI teledeclaration, DICT (Déclaration d'Intention de Commencement de Travaux), and obtaining authorizations for water supply and temporary discharge. It also includes precise well implantation and georeferenced surveys, video inspections, raw water sampling and analysis (pH, Eh, conductivity, temperature, dissolved oxygen, nitrates, iron, manganese), provision of weekly site reports, and a final work report. Provisions for special complementary works on client order are also included.
• Project Structure: The project includes a firm tranche for the creation of one test well (injector) and an optional tranche (TO 1) for the creation of a second well (producer), with an additional optional tranche for development by acidification. The creation of the test well is scheduled for autumn-winter 2026.