| FIELDNAME | DESCRIPTION | DEFINITION | GUIDELINES | VALUES |
|---|---|---|---|---|
| COC_MATRIX | COC Matrix | The code identifying the sample matrix as noted on the chain-of-custody (e.g., water, soil, etc.). | Optional field; may be omitted from EDD. This field provides a link with the EDF_COC. It represents the sample matrix as identified by the field organization, and must contain a valid value. If populated, must contain a valid value. | COC_MATRIX |