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1 ' 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 ff ' 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 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 4 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 form Is for documenting details such as a) Correlation of sample numbers €# 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 acidffled) 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 laboratory files 1 SOP 11 Page 1 of 2 GROUNDWATER TECHNOLOGY, INC