Instrumentation and Monitoring

The scope of works for this package includes: • Supply, installation, and commissioning of ground and ground-water monitoring instrumentation systems • Data acquisition and telemetry for transmission to a Client owned database and visualisation platform (This package of work does not include provision of the database) • All instrumentation is expected to be battery or solar powered • Compliance with relevant industry standards and regulatory requirements • Joint Ventures/Alliances will be considered Packages of work area as follows: InSAR Satellite • Provision of historical data to cover the area of Sizewell B and Sizewell C. • Provision of multi-directional coverage and analysis of the Sizewell B and Sizewell C area until 2036 (period maybe extended).

Unit 1 and 2 Plastic Wall Monitoring • Commence September 2026, end June 2027 • Drilling of approx.

200nr installation boreholes to a depth of 55m below ground level • Installation of IPI, IPIX, VWP and GNSS positional location monitoring Unit 1 and 2 Retaining Walls • Commence September 2026, end January 2028. • Installation in void formers at 200nr locations • Installation of IPI, IPIX, strain gauges and GNSS positional location monitoring Shafts and Tunnels • Commence May 2027, end December 2027. • Installation in void formers at 50nr locations • Installation of IPI, IPIX, strain gauges and GNSS positional location monitoring Backfill Specification • Commence September 2027, end January 2029. • Installation under main nuclear islands • Installation of horizontal Inclinometers/SAA, hydraulic settlement cells and extensometers Provision of Maintenance Team • Commence September 2026, end December 2036 (maybe extended. • Provision of maintenance services to ensure operation of installed instrumentation, maintaining solar and battery powered equipment. • Undertaking manual monitoring where necessary