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Trench for French drainage

We need a trench dug for French drainage to be laid. The trench is 30 meters long, and has been started. However, we do not have technical resources to complete it any more. What's left to be dug is a little more then 26 meters. The width is approx. 40 cm and the depth is 50-60 cm. It is across the lawn, mostly straight, with one or two mild curves. At one point it has a short branch attaching to it. It is included in the specified length. We need this done urgently, within a few days ideally.