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B-2 <br /> of the sample bag was opened and the detector probe immediately placed within the headspace The <br /> highest observed reading was recorded <br /> 2 0 ANALYTICAL PROCEDURES <br /> Selected soil samples submitted to the laboratory were analyzed for benzene, toluene, ethylbenzene, and <br /> total xylenes (BTEX) using EPA Method 8020 and total petroleum hydrocarbons (TPI as gasoline using <br /> EPA Method 8015 Modified <br /> 3 0 UALITY ASSURANCE PLAN <br /> This section describes the field and analytical procedures which were followed throughout the investigation <br /> 3 1 General Sample Collection and Handline Procedures <br /> Proper collection and handling are essential to ensure the quality of a sample Each sample was collected <br /> in a suitable container, preserved correctly for the intended analysis, and stored prior to analysis for no <br /> longer than the maximum allowable holding time Details on the procedures for collection and handling of <br /> soil samples used on this project can be found in Section 1 0 (Methods) <br /> 3 2 Sample Identification and Chain-o f-CustodyProcedures <br /> Sample identification and chain-of-custody procedures ensure sample integrity and document sample <br /> possession from the time of collection to its ultimate disposal Each sample container submitted for <br /> analysis had a label affixed to identify the job number, sampler, date and time of sample collection, and a <br /> sample number unique to that sample This information, in addition to a description of the sample, field <br /> measurements made, sampling methodology, names of on-site personnel, and any other pertinent field <br /> observations, was recorded on the borehole log or in the field records Samples were analyzed by a <br /> California-certified laboratory <br /> A chain-of-custody form was used to record possession of the sample from time of collection to its arrival <br /> at the laboratory When the samples were shipped, the person in custody of them relinquished the samples <br /> by signing the chain-of-custody form and noting the time The sample-control officer at the laboratory <br /> verified sample integrity and confirmed that it was collected in the proper container, preserved correctly, <br /> and that there was an adequate volume for analysis <br /> LRP007 809 <br />