At the time of sampling in the field, there are teams at the time of collection that differentiate it on the helm of the worker, White helmet = technique Green helmet = safety Yellow helper = laborer. Different field but work in one team in the same purpose.
Inlet sampling at unit 94 B at SP-04 in raw water treatment unit, taken at suction pipe output from rear of utility waste
Samples that have been taken into the sample bottle to be taken to the laboratory, to check the pH and other things to avoid environmental pollution
Thanks you all