188.8.131.52 Identification of sample
During systematic planning determine materials (e.g., vegetation or oversized materials), if any, that should be excluded from the sample.
Occasionally the sample container includes objects that are not to be considered part of the sample. DQOs should direct whether vegetation, oversized material, or decantable water are to be included or excluded from the sample. Decantable water can be poured off the top of the settled sample. Vegetation and oversized material can be manually removed with tweezers or spatulas but can be removed more reproducibly with a sieve if the sample is dried. The most common sieve size for ISM samples is <2 mm (standard #10 sieve), but specific objectives may necessitate a smaller or larger sieve. The excluded materials can be documented via photographs and weight removed when appropriate.