Correção de texto: cover theft

Avatar do usuário Andrezzatkm 4820 1 8 105
The city's sanitation company managed to reduce by 50% the theft of manhole cover or sewage grates. The vandals used to take 10 pieces every week. Each one cost R$ 250,00 to the city according to the sewage system manager. This reduction was due to the changing made of the iron cover to concrete.
According to the maneger, only the center of the city will ramain having cover made of iron. That is because it is more dificult to steal them as the streets are more busy.
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Avatar do usuário Telma Regina 22725 9 58 570
My corrections are shown below:

The city's sanitation company managed to reduce the theft of manhole covers and sewage grates by 50%. The vandals used to steal 10 items every week. Each one costs the city R$ 250,00, according to the sewage system manager.
This reduction was due to substituting iron covers for concrete ones.
According to the manager, the iron covers will remain only in the city center because it is more difficult to steal them as the *streets are generally busier.

*And in many cities there are surveillance systems (CCTV) downtown.