The foundation on which the gabions are to be placed shall be level and graded to the elevations as shown on the project drawings, and free of surface irr egularities, loose material, and vegetation in accordance with the project specifications. Appropriate measures must be taken for drainage around the foundation, as per the project s pecifications (geotextile, drain bion structures shall works, etc.). Geotex tiles installed behind gabion structures shall comply with the requirements for subs.