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A-2 <br /> Sample identification and chain-of custody procedures ensure sample integrity and document sample <br /> possession from the time of collection to its ultimate disposal. Each sample container submitted for <br /> analysis had a label affixed to identify the job number,sampler,date and time of sample collection,and <br /> a sample number unique to that sample. <br /> A chain-of-custody form was used to record possession of the sample from time of collection to its arrival <br /> at,,he laboratory. When ti.*,,samples were shipped,the person in custody of them would relinquish the <br /> samples by signing the chrun-of-custody form and noting the time. The sample-control officer at the <br /> laboratory will verify sampl.integrity and confirm;hat it was collected in the proper container,preserved <br /> ccrrecdy, and that there was an adequate volume for analysis. <br /> If these conditions are met, the sample would be assigned a unique log number for identification <br /> throughout analysis and reporting. The log number was recorded on the chain-of-custody form and in <br /> the legally-required log book maintained by the laboratory in the laboratory. The sample description, <br /> date received, client's name; and any other relevant information was also recorded. <br /> 3.3 Analyligal Quality As5p_rnneg <br /> ` In addition to routine calibration of the analytical instruments with standard and blanks, the analyst is <br /> required to run duplicates and spikes on IO percent of the analyses to insure an added measure of <br /> precision and accuracy. Accuracy was also verified through the following: <br /> 1. EPA and state certification programs. <br /> 2. Participation in an interlaboratory of"round-robin" quality assurance program. <br /> Verification of results with an alternative method. For example,calcium may he determined <br /> by atomic absorption,.ion chromatography, or thrimetric methods. Volatile organics may <br /> be determined through either purge and trap or liquid-liquid extraction methods. <br /> 3.4 Misgt1loneous ChecksAccliracy <br /> Where tract:analysis is involved,purity of the solvents,reagents,and gases employed is a great concern. <br /> Ttfc laf�aratofy maintains a-service contract-on-all-major instrumentation;-gas chromatograph;atomic- -- -.= - -- - -- <br /> LF r-7.TA <br />