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They have to be marked in spray paint in a colour appropriate to what it is. On grass, they must have both paint and flags. The colours are as follows:

Blue: Potable water lines

Red: Electrical lines

Orange: Telephone and cable TV lines

Yellow: Gas or steam lines

Green: Sewage lines

Purple: Slurry lines or pipes and/or cables of an undetermined nature

White and pink are not used for utilities - white is used for proposed digouts, and pink is used for surveyor markings

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