In the procurement guide we request a quotation for the design, delivery, deployment, setup, testing, calibration and maintenance of 4 borehole tool strings containing geophones (and optionally, fiber optic cables) and their associated surface installation and equipment, hereafter the ‘design, delivery, and deployment’ of 4 borehole monitoring strings. These tool strings are to be deployed into former geothermal wells at two locations in the Netherlands – the Middenmeer geothermal project and the Bleiswijk geothermal project.