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10 Laboratory Analyses Groundwater samples will be analyzed for TPH and BTEX concentrations at the Eureka Laboratory in Sacramento. These samples will be analyzed by EPA Method 8015, modified and EPA Method 602, respectively. Quality Assurance Plan +r The procedures of the quality assurance plan for sample collection, identification, handling, and analysis are described below. �. Sample Collection and Handling. Proper collection and handling are essential to ensure the quality of the sample. All samples will be collected by experienced field personnel using suitable containers which have been precleaned at the laboratory_ The �. containers will be clearly marked and dated for identification. All samples will be cooled and stored for analysis no longer than the maximum allowable holding time. Sample Identification and Chain-of-Custody Procedures. These procedures ensure sample integrity and document sample possession from the time of collection to its ultimate disposal. Each sample container submitted for analysis will have a label affixed to identify the job number, sampler, date of sample collection, and a sample number unique to that sample. This information, in addition to a description of the sample, field measurements, sampling methodology, names of on-site personnel, and any other pertinent field observations, will be recorded on the boring log or in the field records. A chain-of-custody card (Figure 5) will be used to record possession of the sample from time of collection to its arrival at the laboratory. 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 an 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 sample description, date received, client's name, and any other relevant information will also be recorded. t' Decontamination Procedures. To prevent cross-contamination, soil sampling equipment and all pumps, bailers, and their related tubing will be washed with laboratory- grade detergent and rinsed with tap water before sampling and development work. Downhole drilling equipment and the development pump will be steam-cleaned before use in each borehole or monitoring well. Laboratory Analytical Quality Assurance In addition to routine calibration of the instruments with standards and blanks, the analyst is required to run duplicate and spikes on 10 percent of the analyses to ensure an added measure of precision and accuracy. Accuracy is also verified through certification by DHS.