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i s:+ 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 tinder 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 lit your possession d) It is in a designated secure area a. 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 fora. 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 mastic bag and seal inside the box. 5. She "REMARXS" section in the -upper right part of the form is for documenting details such as: , 6) correlation of sample numbers if samples are split between labs. b) Qi; numbers when lab is logging in the samples. c) ecample temperature and condition when received by lab. d) Preservation notation. e) pH of samples when opened for analysis (if acidified). f, 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 manage:.. 9. When the samples are received by the lab, the chain of custody form will be dated, signed, and a note ofthe time �.. made bya laboratory representative. The form along with shipping hills and receipts will be retained in the labora- tory files. k :w