Provision for Geotechnical monitoring of the dual carriageway works of National Road No. 23 between El Hadjeb at KM 360 and Meska at KM 351, over a distance of 17 km, for the following lots: Lot No.: 01 from KM 360 to KM 362, over a distance of 06 km Lot No. 2 from K: 362 to K: 356 over a distance of 6 km. Lot No. 3 from K: 356 to K: 351 over a distance of 5 km.