ARCHIVED REPORTS_XR0009339 - Laserfiche WebLink

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4.0 SOIL FIELD SCREENING A portable photoionization detector (PID), a type of organic vapor analyzer, may be used to test the presence of volatile organic concentrations in ambient au for the purpose of personnel health , and safety monitoring during field activities. The PID may also be used to screen selected soil samples collected from the soil borings The purpose for the field screening of selected soil samples is to assess the presence of volatile organic compounds in the soil samples ' The PID measures total volatile organics in the air in parts per million by volume in reference ' to a selected standard. Calibration of the PID will be performed each day prior to the soil sampling. The PID may be used to periodically screen for volatile organics in the air space at the top ' opening of the Geoprobe tube, after the probe's bottom plug has been removed. The PID screening method for selected soil samples consists of transferring a soil sample into a new, one- ' pint plastic zip-Iock bag After about 15 minutes, the bag will be opened and the headspace quickly screened for the presence of volatile organics. Soil samples used for field screening will not be submitted to the laboratory for chemical analysis. , The PID cannot specifically identify each volatile compound, but can be adjusted to be sensitive to selected volatile organics All PID readings for soil samples and ambient air at the top of the ' Geoprobe will be recorded on the boring logs Positive readings from the PID screening may be used for selection of soil samples for chemical analysis 5.0 DOCUMENTATION 1 5.1 Sample Control Log Samples collected will be recorded on sample control log sheets (Figure C-1) with indelible ink ' as a means of uniquely identifying and tracking the samples The log sheets will be placed in a binder and the sheets will be numbered consecutively. When sampling is completed, the ' binder and log sheets will be placed in the project file. 5.2 Chain-of-Custody Procedures , After samples have been collected and labeled, they will be maintained under chain-of-custody , procedures. These procedures document the transfer of custody of samples from the field to the laboratory. ' A chain-of-custody record (Figure C-2) shall be filled out for each sample sent to the laboratory for analysis. Information contained on the triplicate carbonless form shall include: C - 2 D 198117XPROTOCOL WPN