Before digging the ground, ...

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Before digging the ground, suggest you to coordinate with other utilities/authorities/companies for their services location plans (such as power/telecom/municipalities drains/OFC etc.,). This will minimise/prevent damages to the existing services. If you cannot get service location plans, then do trial pits at several intervals to detect existing services. Based on this prior investigation, you can eliminate the disruption of services. 

As suggested by other members of this forum, there are several hand held service locating  devices available in the market but have certain limitations as well (up to a certain depth). They are a good starting point if you can afford the cost of procuring such devices.