SAMPLES
Samples used for the BOD test can be either grab or composite. A composite sample is usually specified in most NPDES Permits and will be more representative of the wastestream over a period of time than will a grab sample. The type and location of sample taken will depend on your facility NPDES Permit. Samples should be the type which best fits the capabilities of and requirements for each individual plant. Samples should be taken at a point where they will be well-mixed and proportional to the amount of the flow.