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GT ENVIRONMENTAL LABORATORY (GTEL) S'T'ANDARD OPERATING PROCEDURE CONCERNING CHAIN OF CUSTODY POP 11 I. 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 in your possession d) It is in a designated secure area 2. Castody 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 it inside the box. �. 5. The "REMARKS" section in the upper right part of the farm 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) pX 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 bills and receipts will be retained in the labora- tory files.