The chain of custody portion of the collection cards should be filled out as described:
- If the person collecting the water sample will personally transport the sample to the Post Office (or another delivery service)
- The collector should sign and date the first line labeled "Relinquished By" and then write Post Office (or another delivery service) on the "Received By" line
- Delivery services maintain their own tracking information so they do not need to sign the Chain of Custody form

- If the person collecting the water sample will not personally transport the sample to the Post Office (or another delivery service)
- The collector should sign and date the first line labeled "Relinquished By"
- The person they give the sample to should sign and date on the "Received By" line
- This procedure should be repeated until the sample is given to the Post Office
