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A-2 <br /> 2.0 QUALITY ASSURANCE PLAN <br /> This section describes the field and analytical procedures. <br /> 2.1 General Sample Collection and Handlinig Procedures <br /> Proper collection and handling are essential to ensure the quality of a sample. Each sample was collected <br />' in a suitable container and stored prior to analysis for no longer than the maximum allowable holding <br /> time. Procedures used on this project for collecting and handling of soil samples can be found in <br /> Section 1.0. <br /> 2.2 Sample Identification and Chain-of-Custody Procedures <br /> Sample identification and chain-of-custody procedures ensure sample integrity and document sample <br /> possession from the time of collection until analysis. When the samples were shipped, the person in <br /> custody of them relinquished the samples by signing the chain-of-custody form and noting the time. The <br /> sample-control officer at the laboratory verified that the samples were received in good condition and <br /> were shipped appropriately. Each sample was assigned a unique log number for identification throughout <br /> analysis and reporting. The log number was recorded on the chain-of-custody form and in the <br /> legally-required log book maintained in the laboratory. The sample description, date received, client's <br /> name, and any other relevant information were also recorded. 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. This information, in addition to a description of the sample, <br /> field measurements made, sampling methodology, names of on-site personnel, and any other pertinent <br /> field observations were recorded on the borehole log or in the field records. Samples were analyzed by <br /> ra California-certified laboratory. <br /> 2.3 Analytical Quality Assurance <br /> In addition to routine calibration of the analytical instruments with standards and blanks, the analyst is <br /> required to run duplicates and spikes on 10 percent of the analyses to insure an added measure of <br /> precision and accuracy. Accuracy is also verified through the following: <br /> 1. EPA and state certification programs. <br /> 2. Participation in an interlaboratory or "round-robin" quality assurance program. <br /> 3. Verification of results with an alternative method. Volatile organics may be determined <br /> through either purge and trap or liquid-Iiquid extraction methods. <br /> fRP'I'to3.SJH <br />