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Analytical results of volatile organic contaminant (VOC) concentrations in groundwater samples from A/M Area obtained using a direct sampling ion trap mass spectrometer (DSITMS) and a gas chromatograph (G_ with an electron capture detector (ECD) were comparable. Replicate water samples were collected at the Integrated Demonstration Site during four bii-weekly sampling periods and analyzed by both instruments. The calibration curves prepared for both the DSITMS and GC-ECD are essentially linear over the concentration range analyzed. The advantage of the DSITMS over the GC-ECD method is the rapid sample analysis time of the DSITMS. In order to validate the technology for use in the sample minin3tization efforts at SRS, duplicate groundwater samples from selected compliance wells were analyzed by DSITMS and GC-ECD. The DSITMS is appropriate to use for field screening water samples before offsite analysis. These analytical results will be compared with results from offsite labs contracted to perform contract lab program (CLP) analyses of regulatory samples when these analyses are available.

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Bulk samples (3 to 5 cm 3) were collected during the A/M Area Crouch Branch (Cretaceous) Aquifer Characterization (Phase I) Program. The samples were analyzed for chlorinated VOCs by the Savannah River Technology Center (SRTC) and MieroSeeps Ltd. All samples were sealed in the field immediately upon retrieval of the core and subsampling. A total of 113 samples locations were selected for analysis. The Environmental Sciences Section (ESS) of SRTC analyzed all locations in duplicate (226 samples). MicroSeeps Ltd was selected as the quality assurance (QA) check laboratory. MieroSeeps Ltd analyzed 40 locations with 4 duplicates (44 samples). The samples were collected from seven boreholes in A/M Area in the interval from 200 feet deep to the total depth of the boring (360 feet deep nominal); samples were collected every 10 feet within this interval. The sampling zone corresponds approximately to the Crouch Branch Aquifer in A/M Area. The overall A/M Area Crouch Branch Aquifer characterization objectives, a brief description of A/M Area geology and hydrology, and the sample locations, field notes, driller lithologic logs, and required procedural documentation are presented in WSRC (1993). The primary analytes were trichloroethylene (TCE) and tetrachloroethylene (PCE). Thesample data are summarized in Tables 1 and 2. All of the VOC concentrations were relatively low (less than approximately 0.1 ug/g) in this study. Approximately 70% of the samples were below ,. detection (<0.001 ug/g) for both compounds. The maximum TCE concentration was 0.094 ug/g and the maximum PCE concentration was 0.030 ug/g. No detectable solvents were measured in MBCSB-1, MBCSB-6, and MBCSB-7. TCE was detected in each sample collected from MBCSB-3. Note that this boring is located near monitoring well duster MSB-47, a location previously identified as a principal entry point of VOCs into the groundwater system. The TCE values in MBCSB-3 ranged from 0.003 ug/g to 0.051 ug/g. No PCE was detected in this boring. The rest of the borings (MBCSB-2, MBCSB-4, and MBCSB-5) showed a similar distribution of detected VOCs. These cores showed detectable VOCs near 220 feet deep and in the lower portion of the boring (e.g., 320 to 360 feet deep). Based on examination of the field geologic descriptions, these depths represent water bearing zones between or just above fine grained sediments (aquitards). The expected range of water concentrations associated with each depth discrete sample analyzed during the study is tabulated based on previus comparisons in A/M Area. These findings and additional observations are discusse_ below. The qur_lity assurance checks of the data suggest that the results are of high quality. There was a high degree of concordance between the intralaboratory duplicate samples. Additionally, the sample locations analyzed by both SRTC and MicroSeeps Ltd using different analytical methods yielded similar concentrations. SRTC analyzed the samples using a static headspace method developed to support SRS groundwater VOC remediation activities a...