1.1 This practice covers the procedures for obtaining qualitative or quantitative bottom samples of macroinvertebrates inhabiting sand, gravel, mud, clay, and similar substrates.

1.2 This device is used primarily in estuarine and marine waters, and large rivers.

1.3 For the advantages and limitations of grab sampling devices, see Guide D4387.

1.4 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific precautions, see Section 5.