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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 in 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 . Fach 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 Jilastic bag and seal inside the box. 5 . The "REMARKS" section in the upper right part of the form is for documenting details such as : zi ) 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 ) pH 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 labora- tory files .