Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAP10.2 Groundwater Sampling ProtocolsLimited groundwater sampling will occur as part of planned CSAP activities. Groundwater datacollection will primarily be focused on determining the presence/absence of groundwatercontamination for specific areas and also on contamination extent.Many of the ROIs are not particularly mobile in groundwater. The primary exception is Sr-90,which has been encountered at detectable activity concentrations in groundwater across theWVDP premises. Tritium has also historically been observed in groundwater above backgroundlevels across the WVDP premises, although tritium is not considered a Phase 1 ROI. Tritium canbe a useful indicator of groundwater contamination since its movement through the subsurface isnot constrained by soil interactions; however, in the case of the WVDP, tritium’s relatively shorthalf-life means that it may no longer be a reliable indicator for specific areas of contaminationimpacts. Approximately two to four tritium half-lives have passed since the time that mostsubsurface releases would have taken place.Accordingly, groundwater sampling and analysis will focus on Sr-90. Groundwater samples willprimarily be “grab” samples collected from specific depth intervals. Task-specific work plans andassociated SOPs will specify the methods to be used to obtain depth-specific groundwatersamples. In general, sufficient volume will be collected to allow for analysis of Sr-90;groundwater samples collected in this manner will be filtered prior to analysis. Additional detailsabout sampling tools and related field protocols will be described in SOPs to be developed by thecontractor responsible for CSAP data collection.10.3 Sample Chain-of-Custody/Documentation10.3.1 Field LogbooksAll information pertinent to field activities, including field instrument calibration data, will berecorded in field logbooks. The logbooks will be bound, and the pages will be consecutivelynumbered. Entries in the logbooks will be made in black waterproof ink and will include, at aminimum, a description of all activities, individuals involved in field activities, dates and times ofsampling, weather conditions, any problems encountered, and all field measurements. Lotnumbers, manufacturer names, and expiration dates of standards used for field instrumentRev. 1 70