ARCHIVED REPORTS XR0003462 - Laserfiche WebLink

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. A-z sample Identification and Chain-of-Custody Procedures Sample identification and chain-of custody procedures ensure sample integrity and document sample possession from the tune of collection to its ultimate disposal Each sample container submitted for analysis had a label affixed to identify the job number, sampler, date and time of sample collection, and a sample number unique to that sample. A chain-of-custody form was used to record possession of the sample from time of collection to its arrival at the laboratory. When the samples were shipped, the person in custody of them would relinquish the samples by signing the chain-of-custody form and noting the time The sample-control officer at the laboratory will verify sample integrity and confirm that it was collected in the proper container, preserved correctly, and that there was an adequate volume for analysis. If these conditions are met, the sample would be assigned a unique log number for identification throughout analysis and reporting The log number was recorded on the chain-of-custody form and in the legally-required log book maintained by the laboratory in the laboratory The sample description, date received, client's name, and any other relevant information was also recorded. 3.3 Analytical Quality Assurance In addition to routine calibration of the analytical instruments with standard and blanks, the analyst is required to run duplicates and spikes on 10 percent of the analyses to insure an added measure of precision and accuracy Accuracy was also verified through the following 1 EPA and state certification programs 2 Participation in an interlaboratory of "round-robin" quality assurance program. 3 Verification of results with an alternative method For example, calcium may be determined by atomic absorption, ion chromatography, or titrimetric methods Volatile organics may be determined through either purge and trap or liquid-liquid extraction methods • LRP120 JDM