70,000 cubic metres (2.5 million cu. ft.) of concrete and 20,000 cubic metres (700,000 cu. ft.) of pre-cast reinforced concrete elements were used. 12,000 cubic metres (424,000 cu. ft.) of concrete was demolished and removed and 30,000 cubic metres (1.1 million cu. ft.) of natural stone was refurbished.
The roof was extended, to cover a total of 37,000 square metres. With 20 roof-supporting columns carrying a weight of 3,500 tons of steel.
With the intention to create a more intimate atmosphere for football games the playing field was lowered (even more) by 2.65 metres (9 feet); approximately 90,000 cubic metres (3.2 million cu. ft.) of sand was excavated. The lower tier of seating in the stadium was demolished and rebuilt at a completely different angle of inclination.
The conservation factor of the Olympiastadion as a historical monument was also considered, especially with respect to the preservation of the natural stone blocks. Deserving a separate comment the critics that caused the change of the colour of the athletics track around the game field from red to blue. (Source)
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