Restricted Tender With Public Participation Competition Vob/A Concrete Work (Din 18 331); The Upper Seven Centimeters Of The Floor Slab Should Be Removed Over A Large Area Using High-Pressure Water Removal. An Additional Probationary Period Must Then Be Filed...  More Concrete Work (Din 18 331); The Upper Seven Centimeters Of The Floor Slab Should Be Removed Over A Large Area Using High-Pressure Water Removal. An Additional Proving Layer Must Then Be Inserted And The Floor Slab Must Be Concreted Back To The Original Level. The Base Plate Must Then Be Given A Protective Coat Of Paint.