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—ft— O=, <br /> r �r <br /> rr$ <br /> immediately above the desired sampling depth and then driving (vertical, borings) or <br /> i 'pushing (slant borings) a Modified California Sampler, lined with three brass tunes, into <br /> the undisturbed soil. The sampler is then removed from the bottom of the baring. The <br /> ends of the bottom(third) tube are covered with Teflon and sealed with tight-fitting plastic <br /> I caps. <br /> i J 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 /> F ` custody seal are attached at the end of this appendix. <br /> B-2.4 Qualitative Field Screening <br /> p.a <br /> An organic vapor detector,such as a Photovac TO,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). Feld calibration is <br /> performed using a calibrated span gas. Ambient air is used to set the instrument zero. A <br /> 9 calibration form is attached. The soil contained in the cone of the sampler or in a brass <br /> ' tube is expated 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 /> f : the volatile concentrations in the breathing zone prior to and during the drilling of the <br /> i., 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 /> r+ <br /> work. <br /> B-2.5 Sample Handling <br /> After labeling, the sample is immediately stored in an iced cooler for transport <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 /> `- F6-FIELDPRO <br />