In running fly levels from a benchmark of reduced level 212-40 m, a surveyor took an intermediate sight of 0-420 m with the staff held on a benchmark of reduced level 264-005 m. The sum of Back Sights and Fore Sights from the start to second BM is 75-205 m and 23.450 m, respectively. What is the closing error on the second benchmark? If the distance between the first BM and second BM is 30 km, comment whether the work is satisfactory for ordinary levelling for location and construction survey or not.