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FLUOR DANIEL GTI, INC. 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 it was in your possession d) It is in a designated secure area 2. Custody of samples may be transferred from one person to another. Each transferor and recipient must date, sign and note the time on the chain-of-custody form. 1 In shipping, the container must be sealed with tape, and bear the sender's signature across the area of bonding at the ends of the tape 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 the box. Place form in a plastic bag and seal it inside the box. 5. The "REMARKS" section 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) pH of samples when opened for analysis (if acidified). f) Sampling observation or sampling problem. 6. The chain-0f-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 the time noted by a laboratory representative. The form will be retained in the laboratory files along with shipping bills and receipts . 8. At the time of receipt of samples by the laboratory, the shipping container will be inspected and the sealing signature will be checked. The samples will be inspected for condition and bubbles, and the temperature of a representative sample container will be measured externally by a thermocouple probe (held tightly between two samples) and recorded. The laboratory QC numbers will be placed on the labels, in the accession log, and on the chain-of-custody form. If samples are acidified, their pH will be measured by narrow range pH paper at the time of opening for analysis. All comments concerning procedures requiring handling of the samples will be dated and initialed on the form by the laboratory person performing the procedure. A copy of the completed chain-of-custody form with the comments on sample integrity will be returned to the sampler.