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PROPOSED WORK PLAN FOR PRE-TANK PULL SOIL ASSESSMENT Shell Service Station, Stockton, CA Delta Project No.40-88-147 Page 9 y i 5.2 Sample Identification and Chain-of-Custody Procedures .. Sample identification and chain-of-custody procedures ensure sample integrity and document sample possession from the time of collection to its ultimate disposal. Each sample container submitted for L analysis will have a label affixed to identify the job number, sampler,date and time of sample collection, T and a sample"number unique to that sample. This information, in J'addition to a descripdon of the sample, field:�measurements made, sampling methodology, names of on-site personnel; and.any other -- pertinent field observations will be recorded on the borehole log or in the field record's. All samples will be analyzed by Eureka Laboratories in Sacramento, California. A chain-of-custody form will be used to record possession of the sample from time of collection Wits arrival at the Jaboratory. When the samples are shipped, the person in custody of them will"relinquish 'E the samples by signing the chain-of-custody form and noting the time. The sample-control officer at Eureka Labs will verify sample integrity and confirm that it was collected in the pro per;container, preserved correctly, and that there is an adequate volume for analysis. t q. If these conditions are met, the sample will be assigned a unique log number for identification through- : y out analysis and reporting. The log number will be recorded on the chain-of-custody form and,in the ' legally-required log book maintained by Eureka Labs in the laboratory. The sample''description, date received, client's name, and any other relevant information will also) be recorded. 5..3 Analytical Ouality Assurance In addition to routine calibration of the analytical instruments with standards and blanks, -the analyst (Eureka Labs) is required to run one method blank and one spiked sample per sample batch. Duplicates — are run on ten percent of the analyses to insure an added measure of precision and accuiacy.11Accuracy is also verified through the following: 1 U.S. Environmental Protection Agen cy°(EPA) and State certification programs. r _ 4 I 2) Participation in an inter-laboratory or "round=robin quality assurance program.