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THE REMEDIATION GROUP, inc 4.2 Chain-of-Custody Procedures After samples have been collected and labelled, they will be maintained under chain-of-custody procedures These procedures document the transfer of custody of samples from the field to a designated laboratory A Chain-of-Custody Record will be filled out for each shipment of samples to be sent to the laboratory for analysis (Figure 1) Information contained on the form shall include o date and time the sample was taken o sample number and the number of sample containers o analyses required ` o remarks including preservatives added and any special conditions o name of the project manager who will receive the results o turnaround time for sample analyses (standard, rush, etc ) 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 Chain-of-Custody Record, releasing the samples to either another company representative or a courier delivering the samples, or to the laboratory representative Any blank space on the Chain-of-Custody Record between last sample number listed and signature at the bottom of the sheet will be crossed out as will unused blank signature blocks When shipping the containers by a common carver, 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 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 protocol gw 6 16 July 1994