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k%J KLEINFELDER <br />adjacent to existing wells, no samples will be collected from 0 to 50 feet. Samples are <br />collected by advancing the boring to a point immediately above the desired sampling depth <br />and then driving (vertical borings) or pushing (slant borings) a Modified California <br />Sampler, lined' with three brass tubes, into the undisturbed soil. The sampler is then <br />removed from the bottom of the boring. The ends of the bottom (third) tube are covered <br />with Teflon and sealed with tight -fitting plastic 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 />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 chain-of- <br />