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GT ENVIRONMENTAL. LABORATORY (GTEL) <br /> STANDARD OPERATING PROCEDURE <br /> CONCERNING CHAIN OF CUSTODY <br /> SOP 11 <br /> 1. Samples must be maintained under custody until shipped or delivered to the laboratory. The <br /> laboratory will then maintain custody. A sample is under custody if: <br /> a) It is in your possession. <br /> b) It is in your view after being In your possession. <br /> c) You locked It up after being in your possession. <br /> d) It Is In a designated secure area. <br /> 2. Custody of samples may be transferred from one person to the next. Each transferee and <br /> recipient must date, sign and note the time on the chain-of-custody form. <br /> 3. In shipping, the container must be sealed with tape, bearing the sender's signature across the area <br /> of bonding at the ends of the tape in order to prevent undetected tampering. Each sampling jar <br /> should be taped and signed as well. Scotch tape works well. <br /> 4. Write "sealed by" and sign in the"Remarks" box at the bottom of the form before sealing up the <br /> box. Place form in a plastic bag and seal it Inside the box. <br /> 5. The "REMARKS" section in the upper right part of the form is for documenting details such as: <br /> a) Correlation of sample numbers If samples are split between labs. <br /> I b) OC numbers when lab is logging in the samples. <br /> E c) Sample temperature and condition when received by lab. <br /> ` I d) Preservation notation. <br /> l e) pH of samples when opened for analysis (If acidified). <br /> f) Sampling observation or sampling problem. <br /> k 5. The chain-of-custody form should be included inside the shipping container. A copy should be <br /> sent to the project manager. <br /> 1f , <br /> GROUNDWATER <br /> ETTECHNOLOGY, INC. <br />