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A-2 <br /> • <br /> Upon recovery, the three soil sample tubes were removed from the sampler One portion of the soil <br /> sample was placed in a ziplock bag for screening with an photoionization detector (PID), and another <br /> portion of the soil sample was used for classification and description One of the soil sample tubes was <br /> sealed and stored at approximately 4°C for transport to the laboratory <br /> A chain-of-custody form was used to record possession of the samples from time of collection to arrival <br /> at the laboratory When the samples were shipped, the person in custody of them relinquished the <br /> samples by signing the chain-of-custody form and noting the time The sample control officer at the <br /> laboratory verified sample integrity and confirmed that it was collected in the proper container, preserved <br /> correctly, and that there was an adequate volume for analysis <br /> 3.1 Soil Classification <br /> Soil samples collected at 5-foot intervals were classified by the Delta geologist in accordance with the <br /> Unified Soil Classification System (USCS) Representative portions of the samples were retained for <br /> further examination and for verification of the field classification Logs of the borings indicating the <br /> ® depth and identification of the various strata, N values, and pertinent information regarding the method <br /> of maintaining and advancing the borehole were made <br /> 3 2 Soil Sample Screemn /hNu Portable Photoiomzation Detector Method <br /> The soil samples contained in ziplock bags were brought to ambient temperature and the headspace vapors <br /> within each bag were screened with a PID equipped with a 10 2 eV lamp The corner of the sample bag <br /> was opened and the detector probe immediately placed within the headspace The highest observed <br /> reading was recorded <br /> 4,0 ANALYTICAL PROCEDURES <br /> Selected soil samples submitted to Western Environmental Science and Technology (WEST) laboratory <br /> in Davis, California for analysis of benzene, toluene, ethylbenzene, and total xylenes using EPA Method <br /> 8020, and TPH as gasoline and diesel using EPA Method 8015 Modified <br /> 5.0 UALITY ASSURANCE PLAN <br /> This section describes the field and analytical procedures which were followed throughout the assessment <br /> LRP202 CAC <br />