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TREADWELL & ROLLO After carefully packaging the samples into ice-cooled chests for transfer to the laboratory, the field sampler will sign the Chain-of-Custody Record and record the time and the date The Chain-of-Custody Record will accompany the sample containers. The sampler must also sign the bottom of the Cham-of-Custody Record, releasing the samples to either another Treadwell & Rollo, Inc representative or a couner delivering the samples, or to the laboratory representative. Any blank space on the Cham-of-Custody Record between last sample number listed and signatures at the bottom of the sheet will be crossed out as will unused blank signature blocks When shipping the containers by a common carrier, a Bill of Landing is used Receipts of Bill of Landing are retained as part of the permanent documentation in the project file 5.0 EQUIPMENT CLEANING Sample bottles and bottle caps will be cleaned by the analytical laboratory subcontractor using standard EPA-approved protocols Sample bottles and bottle caps will be protected from solvent contact, dust or other contamination between time of receipt by Treadwell & Rollo, Inc and time of actual usage at the sampling site If dedicated sampling equipment is used, it will be cleaned prior to its initial introduction into the well. Sampling equipment to be reused will be cleaned after sampling of each well is completed. Thermometers, pH electrodes, and conductivity probes that are used repeatedly shall also be cleaned after sampling of each well Minimum cleamng procedures shall be accomplished as follows: I o Scrub with a detergent-potable water solution or other solutions deemed appropriate using a hard bristle brush, o rinse with clean potable water, o rinse with deionized water, o air dry, and o package and seal equipment in plastic bags or other appropriate containers to prevent contact with solvents, dust or other contaminants. • A-7 110707(}9 PJC 1 April 1994