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(a) These methods cover the sampling of industrial water for physical, chemical, or biological tests. (b) Normal variations in processes and in equipment from plant to plant preclude the possibility of specifying standard methods of sampling that are applicable in all cases. Definite principles have, however, been established as a basis for the formulation of procedures for sampling which are applicable in general and probably applicable in most specific cases. Where modifications of these procedures are necessary, they may be made by the exercise of trained judgment in each individual case. (c) Changes which may be necessary in these procedures under specific circumstances may be made in any particular case by mutual agreement of the parties concerned.