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PRE-TANK REPLACEMENT Site Assessment Work Plan <br /> 420 WEST KETTLENAN LANE,LO01, CA. <br /> Aer.fs Project No. 89-013 <br /> Page 14 <br /> hole log in the field records. All samples will be analyzed by a <br /> State-certified laboratory. <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. When <br /> the samples are shipped, the person in custody of them will relinquish <br /> the samples by signing the chain-of-custody form and noting the time. <br /> The sample-control officer at the laboratory will verify sample <br /> integrity and confirm that it was collected in the proper container, <br /> preserved correctly, and there is an adequate volume for analysis. <br /> If these conditions are met, the sample will be assigned a unique log <br /> number for identification throughout analysis and reporting.. The log <br /> number will be recorded on the chain-of-custody form and in the <br /> legally-required log book maintained by the laboratory in the labora- <br /> tory. The sample description, date received, client's name and any <br /> other relevant information will also be recorded. <br /> f <br /> 4.5.3 Analvtical Quality Assurance <br /> I <br /> .�' In addition to routine calibration of the analytical instruments with <br /> i standards and blanks, the analyst is required to run duplicates and <br /> 4� spikes on 10 percent of the analyses to insure an added measure of <br /> J precision and accuracy. Accuracy is also verified through the follow- <br /> ing: <br /> 1. U.S. Environmental Protection Agency (EPA) and State <br /> certificationro rams. <br /> p g <br /> 2. Participation on an interlaboratory or "round-robin" quality <br /> assurance program. <br /> s3. Verification of results with an alternative method. For example, <br /> j calcium may be determined by atomic absorption, ion <br /> chromatography, or titrimetric methods. Volatile organics may be i <br /> determined through either purge and trap or liquid-liquid <br /> i extraction methods. ! <br /> 4.5.4 Miscellaneous Checks of Accuracy <br /> Where trace analysis is involved <br /> Y , purity of the solvents, reagents and <br /> gases employed is of great concern. The laboratory maintains a service <br /> contract on all major instrumentation; gas chromatograph; atomic <br /> ti absorption, ion chromatography, and total organic carbon analyzers are <br /> a11-serviced--and_-maintained-reg ularly.-- -The above program is more than sufficient for most needs. Additional <br /> z quality assurance such as spikes and duplicates on all analyses, will <br /> be provided if requested. <br /> J. <br /> F <br /> .1 <br /> E <br /> t _ <br />