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-" 5.1.3 Soil Sample Screening: Portable Photoicnization Detector 1 Method 1 After the soil sample container has been brought to ambient temperature, the head space of the container will be screened with a'; PID or TLV organic vapor sensor calibrated for direct reading in parts-per-million-volume (ppmv) . The sample container will be partially opened and the detector probe immediately placed within the headspace of the container. The highest observed reading will be racorded. i 5.2 Ouality Assurance Pian h t 5.2.1 General Sample: Collection and Handling Procedures Proper collection and handling are essential to ensure the quality of a sample. Each sample will be collected in a suitable container, preserved correctly for the intended analysis and stored prior to analysis ! for no longer than the maximum allowable holding time. Details on the procedure for collection and handling of soil samples to be used!on this project can be found in Section 4.1. i 5.2.2 Sample Identification and Chain-of-Custody Procedures j Sample identification and chain-of-custody procedures ensure sample integrity and document sample possession from the time of collec- tion to its ultimate disposal. Each sample container submitted for analysis will have a label affixed to identify the job number, date and time 'of samplejcollection and a sample number unique to that , sample. FThis information, in addition to a description of the sample, field measurements made, sampling methodology, names bf on- p site personnel, and any other pertinent field observations, will be recorded on the borehole log in the field records. All samples will be analyzed by a state-certified-laboratory. A chain-mf-custody :;form will be used to record possession of the sample from time of collection to its arrival at the laboratory. When the 'samples are shipped, the person in custody of them will relinquish the samples by signing the chain-of-custody form and noting the time. The sample-control officer at the laboratory will verify sample integrity and confirm that it was collected in the proper container, preserved correctly and there is adequate volume for analysis. If these conditions are met, the sample will be assigned a unique log number for identification throughout analysis and reporting. The log number will be recorded on the chain-of- custody form and in ,the legally-required log book maintained by the laboratory. The sample description, date received, client's name and any other relevant information will also be recorded. h