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1 <br /> j i I L <br /> �17 5 2 samplelIdentification and Chain-of-Custody Procedures <br /> tsample identification and chain-of-custody procedures ensure sample <br /> °.integrity and document sample possession from the time of collec- <br /> ¢Ition to its ultimate disposal. Each sample container submitted for <br /> analysis will have a label affixed to identify the job number, <br /> date, ;and time of sample collection, and a sample number unique to <br /> �ithat sample. 'j,This information, in addition to a description of the <br /> I'sample, ',field measurements made, sampling methodology, names of on- <br /> � site personnel, and any other pertinent field observations will be <br /> 1 3recorded on the borehole log in the field records. All samples will <br /> {'be analyzed by a state-certified-laboratory. <br /> j' <br /> 'A chain-of-custody form will be used to record possession of the <br /> sample from time of collection to its arrival at the laboratory. <br /> r,When the samples are shipped, the person in custody of them will <br /> :: relinquish the samples bysigning the chain-of-custody form and <br /> time. The sample-control officer at the laboratory will <br /> Tnoting the t <br /> ;'verify sample integrity and confirm that it was collected in the <br /> ",proper container, preserved correctly, and there is an adequate <br /> j;volume for analysis.If these conditions are met, the sample will <br /> .kbe assigned ja unique log number for identification throughout <br /> analysis andl reporting. The log number will be recorded on the <br /> chain={of-custody form and in the legally-required log book <br />,. maintained by the laboratory in the laboratory. The sample <br /> description, 'i� date received, client's name and any other relevant <br /> information will also be recorded. <br /> '. 7 -5.3Analytical Ouality Assurance <br /> 4. 1, 'i <br /> ,, In addition to routine calibration of the analytical instruments <br /> , with standards and blanks, the analyst is required to run dupli- <br /> cates ' and spikes on 10 percent of the analyses to insure an added <br /> measure of .precision and . accuracy. Accuracy is also verified <br /> llthrough the following: <br /> 1. U.S. Environmental Protection Agency (EPA) and State <br /> certification programs. <br /> { <br /> 1 '2 . Participation in an interlaboratory or "round-robin" quality <br /> assurance program. <br /> 3 . Verification of results with an alternative method. For <br /> example!, calcium may be determined by atomic absorption, ion <br /> chromatography, or titrimetric methods. Volatile organics may <br /> ` be` determined through either purge and trap or liquid-liquid <br /> extraction methods. <br /> r <br /> k <br /> � IE <br />