An inspector is collecting a water sample from a facility's effluent to check for permit violations. To ensure the sample's integrity and admissibility as evidence, what is the MOST critical procedure the inspector must follow?
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A
Use a pre-cleaned sample container provided by the facility.
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B
Take a photograph of the sample location after collection.
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C
Document the sample's collection and transfer using chain-of-custody procedures.
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D
Immediately test the sample's pH using a field instrument.