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9.0QUALTMy ASSURANCE PLAN 3 , 1 General Sample collection and Hg dlina procedures Proper collection and handling are essential to ensure the quality of a sample. Each sample will be collected in a suitable container, preserved correctly for the intended analyses, and stored prior to analysis for no longer than the maximum allowable holding time. Details on the procedure for collection and han- dling of soil samples to be used on this project can be found in Section 1 . 0 (Methods) . ale Identifica*�or and Chain-of-Cuetody 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 analysis will have a label affixed to identify the job number, date, and time of sample collection, and a sample number unique to that sample. This information, in addition to a de- scription of the sanple, field measurements made, sampling methodology, names of on-site personnel , and any other pertinent field observations will be recorded on the borehole log in the field records. All samples will be analyzed by a State-certified laboratory. A chain-of-custody form will be used to record possession of the sample from time of collection to ifs arrival at the laboratory. When the samples are shipped, the person in custody of them will 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 is and adequate volume for analysis. If these conditions are met, the sample will be assigned a unique log number for identification throughout analysis and reporting. The log number will be 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 will also be recorded. 1 . 2 Analytical Quality Assurance In addition to routine calibration of the analytical instruments with standards and blank, the analyst is required to run dupli- cates and spikes on 10 percent of the analyses to insure an added measure of precision and accuracy. Accuracy is also verified through the following: 1 . U. S. Environmental Protection Agency (EPA) and State cer- tification programs. Page! 2