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immediately above the desired sampling depth and then driving (vertical borings) or <br /> pushing (slant borings) a Modified California Sampler, lined with three brass tubes, into <br /> the undisturbed soil. The sampler is then removed from the bottom of the boring. The <br /> ends of the bottom (third) tube are covered with Teflon and sealed with tight-fitting plastic <br /> caps. <br /> After the samples are collected they are individually labelled. The label includes <br /> Kleinfelder's name, job number, the date and time the sample was collected, the employee <br /> number of the individual who performed the sampling, and a unique five-digit sample <br /> identification number. A custody seal is also placed on the sample in such a way that any <br /> attempt to tamper with the sample is easily visible. An example of a sample label and <br /> custody seal are attached at the end of this appendix. <br /> A-2.4 Qualitative Field Screening <br /> An organic vapor detector, such as a Photovac TIP, using a photoionization detector (PID) <br /> or a Foxboro flame ionization detector (FID), is used to provide a qualitative screening of <br /> each soil sample collected from the borings. The organic vapor detector measures <br /> ionizable compounds in the air in parts per million by volume (ppmv). Field calibration is <br /> performed using a calibrated span gas. Ambient air is used to set the instrument zero. A <br /> calibration form is attached. The soil contained in the cone of the sampler or in a brass <br /> tube is exposed and screened with the organic vapor detector. The vapor reading is noted <br /> as the field screening result. <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 /> A-2.5 Sample Handling <br /> SAfter 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 chain-of- <br /> custody form is attached to the cooler. The chain-of-custody form includes Kleinfelder's <br />