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GT ENVIRONMENTAL LABORATORY (GTEL) STANDARD OPERATING PROCEDURE CONCERNING CHAIN OF CUSTODY SOP 11 1. Samples must be maintained under custody until shipped or delivered to the laboratory. The laboratory will then maintain custody. A sample is under custody if: a) It is in your possession b) it is in your view after being in your possession c) You locked it up after being it► your possession d) It is in a designated secure area 2. Custody of samples may be transferred from one person to the next. Each transferee and recipient must date, sign and note the time on the chain of custody form. 3. In shipping, the container must be sealed with tape, bearing the sender's signature across the area of bonding at the ends of the tape in order to prevent undetected tampering- Each sampling jar should be taped and signed as well. Scotch tape works well. 4. write "sealed by" and sign in the Remarks box at the bottom of the form before sealing up the box. Place form in a plastic bag and seal inside the box. 5. The "REMARKS" section in the upper r?ght part of the form is for documenting details such as: a) correlation of sample numbers if samples are split between labs. b) QC numbers when lab is logging in the samples. C) sample temperature and condition when received by lab. d) Preservation notation. e) p1l of samples when opened for analysis (if acidified) . f) Sampling observation or sampling problem 6. The chain of custody form should be included inside the shipping container, A copy should be sent to the project manager. 7. when the samples ,are received by the lab, the chain of custody form will be dated, signed, and a note of the time made by a laboratory representative. The form along with shipping hills and receipts will be retained in the laboxa- tory files.