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individual who performed the sampling, and a unique five-digit sample identification number. A custody seal is also placed on the sample in such a way that any attempt to tamper with the sample is easily visible. An example of a sample label and custody seal are attached at the end of this appendix. A-2.4 Qualitative Field Screening An organic vapor detector, such as a Photovac TIP, using a photoionization detector (PID) or a Foxboro flame ionization detector (FID), is used to provide a qualitative screening of each soil sample collected from the borings of the organic vapor detector measures ionizable compounds in the air in parts per million by volume (ppmv). Field calibration is performed using a calibrated span gas. Ambient air is used to set the instrument zero. A calibration form is attached. The soil contained in the cone of the sampler or in a brass tube is exposed and screened with the organic vapor detector. The vapor reading is noted as the field screening result. For the protection of the drilling crew, the organic vapor detector is also used to measure the volatile concentrations in the breathing zone prior to and during the drilling of the samples. Total ionizable hydrocarbon readings in excess of one ppmv may necessitate respiratory protection for the affected crew members. This requirement is included in the complete field health and safety plan developed for the project prior to the start of field work. A-2.5 Sample Handling After labeling, the sample is immediately stored in an iced cooler for transport to Kleinfelder's office sample control or to the analytical laboratory. A Kleinfelder chain-of-custody form is attached to the cooler. he chain-of-custody form includes Kleinfelder's name, address and telephone number, the employee number of the individual who performed the sampling, the sample numbers, the date and time the samples were collected, the number of containers each sample occupies, and the analyses for which the samples are being submitted, if any. The chain-of-custody form is signed by each person who handles the samples, including all Kleinfelder employees and the receiving employee of the analytical laboratory when the samples are delivered. An example of the chain-of-custody form is attached to this appendix. A-2.6 Soil Sample Selection for Laboratory Analysis The selection of soil samples for laboratory analysis is based upon 1) the project objectives and requirements, 2) qualitative field screening performed in the field using the organic vapor 117226.E02/ST013R0176 Page A-2 January 31, 2013 Copyright 2013 Kleinfelder