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%WOI �.i✓ L' 2.0 ANALYTICAL PROCEDURES All soil samples submitted to the laboratory will be analyzed by EPA Method 8020 for benzene, toluene, ethylbenzene, and xylenes (BTEX), and by U.S. Environmental Protection Agency (EPA) Method 8015 Modified for total purgeable petroleum hydrocarbons (TPPH). All ground water samples submitted to the laboratory will be analyzed by EPA Method 602 for BTEX and EPA Method 8015 Modified for TPPH. Total lead will be analyzed in soil and ground water samples by EPA Method 6010. 3_0 QLIALITY ASSURANCE PLAN This section describes the field and analytical procedures to be followed throughout the investigation. 3.1 General Sarngle Collection and Handling 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 intended analyses, and stored prior to analysis for no longer than the maximum allowable holding time. Details on the procedure for collection and handling of soil and ground water samples to be used on this project can be found L" in Section 1.0. 3.2 p y c am le Identification and Chain- 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 t.+ analysis will have a label affixed to identify the job number, sampler, date and time of sample collection,and a sample number unique to that sample. This information, in addition to a description 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 records. All samples will be analyzed by a California state-certified laboratory. A chain-of-custody form will be used to record possession of the sample from time of collection to LA its 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 of shipment. The sample control officer 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. 9.0 3.3 Analytical Quality Assurance In addition to routine calibration of the analytical instruments with standards and blanks, the analyst is required to run duplicates and spikes on 10 percent of the analyses to insure an added measure of 168 precision and accuracy. Accuracy is also verified through the following: r.. 1. EPA and State certification programs. 2. Participation in an interlaboratory or "round-robin" quality assurance program.