Sampling method seems ok to ...

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Sampling method seems ok to me

You could make it representative and all - I mean take it from several locations instead of one. But more importantly, what are you doing with this testing? I'm surprised to know Lake Malawi has a regular monitoring system. That is good. The current method - well, I think it would give you some idea of which way the water contamination is moving - you know it is water not land (things diffuse pretty fast in it). So, the method set up by him seems ok to me really.