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KLEINFELDER <br /> For the protection of the drilling crew, the organic vapor detector is also used to measure <br /> the volatile concentrations in the breathing zone prior to and during the drilling of the <br /> samples. Total ionizable hydrocarbon readings in excess of one ppmv may necessitate <br /> respiratory protection for the affected crew members. This requirement is included in the <br /> complete field health and safety plan developed for the project prior to the start of field <br /> work. <br /> B-2.5 SAMPLE HANDLING <br /> After labeling, the sample is immediately stored in an iced cooler for transport to <br /> Kleinfelder's office sample control or to the analytical laboratory. A Kleinfelder <br /> chain-of-custody form is attached to the cooler. The chain-of-custody form includes <br /> Kleinfelder's name, address and telephone number, the employee number of the individual <br /> who performed the sampling, the sample numbers, the date and time the samples were <br /> collected, the number of containers each sample occupies, and the analyses for which the <br /> samples are being submitted, if any. The chain-of-custody form is signed by each person <br /> who handles the samples, including all Kleinfelder employees and the receiving employee <br /> of the analytical laboratory when the samples are delivered. An example of the <br /> chain-of-custody form is attached. <br /> B-2.6 SOIL SAMPLE SELECTION FOR LABORATORY ANALYSIS <br /> The selection of soil samples for laboratory analysis is based upon: 1) the project <br /> objectives and requirements, 2) qualitative field screening performed in the field using the <br /> organic vapor detector, and 3) field observations such as lithology, odor, discoloration, or <br /> high moisture content. Generally, samples are submitted from the bottom of the boring <br /> and from soil horizons with significant potential for contamination as indicated by the <br /> organic vapor detector, observations, and site history. Samples may be collected from <br /> regular intervals when information on concentrations versus depth is desired. Samples that <br /> are not selected for laboratory analysis are held in sample control for possible future <br /> reference. When these samples are no longer needed, they are returned to the site and are <br /> combined with the soil cuttings generated during their collection. <br /> C7-90-99 B-3 <br />