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MOB, � _� N <br /> ME;;, "M <br /> ME <br /> w <br /> t � <br /> 4. Duplicate Groundwater Samples <br /> Duplicate groundwater samples wAll be collected and analyzed <br /> to track the consistency in field sampling techniques. The <br /> ,�. duplicate samples will be collected immediately after the <br /> primary sample at the same location, using the same sampling <br /> equipment and <br /> p procedures. In accordance with the District's <br /> Sampling Plan, duplicates will be taken for 10# of the <br /> groundwater samples obtained. <br /> 5. Chain-of-Custody Record <br /> A chain-of-custody record for each container or sample will <br /> be used to track possession of the samples from the time they <br /> were collected in the field until the time they are analyzed <br /> in the laboratory. <br /> (" The chain-of-custody record will contain the foil <br /> !- information: <br /> 1. Site Name <br /> f. 2. Signature of collector <br /> 3. Date and time of collection <br /> e 4. Sample identification number(s) <br /> {; 5. Number of containers in sample set <br /> Asa 6. Description of sample and container(s) <br /> 7. Name and signature of persons, and the companies or "5 <br /> agencies they represent, who are involved in the <br /> !: chain of possession <br /> 8. Inclusive dates and times of possession <br /> 3<4 9. Requested analysis for each sample <br /> 6. Equipment Cleaning <br /> �= Sample bottles and bottle caps will be cleaned by t <br /> he <br /> analytical laboratory subcontractor using standardEPA- <br /> fS approved protocols. Sample bottles and bottle caps will be <br /> protected from solvent contact, dust or other contamination <br /> between time of receipt and time of actual usage at the <br /> I+ sampling sits. <br /> Sampling equipment that will be re-used shall be cleaned <br /> after sampling of each well has been complor:*ed. <br /> lipThermometers, pH electrodes, and conductivity probes the',`Fa%e <br /> used repeatedly shall also be cleaned after sampling of each <br /> well. g <br /> 7. Cleaning ea ing procedures shall be accomplished as follows: <br /> A. -Scrub with a detergent-potable water solution or other <br /> solutions deemed appropriate using a hard bristle brush. <br /> t� <br />