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A passive soil gas study was conducted in the Building 419/511 (B419/511) area to screen for volatile organic compound (VOC) source locations in June 2000. Results of this study are presented with the most recent ground water contaminant plume maps, as well as the historic surface vapor analysis and soil contamination maps. Limited analytical data exists for the area directly north and west of B419. Because of extensive VOCs in ground water directly under the north end of B419, it is important to determine if the contaminant plume migrated to that location or if it originated from activities at B419. The results of this and previous investigations will aid in defining (1) the source(s) of contamination, (2) the placement and management of future remediation wells, and (3) remediation strategies. A brief description of the building's function and contamination summary is presented in Section 1.1. Section 1.2 presents the methodology used for the passive soil gas study. Section 1.3 is a discussion of the passive soil gas study and the hydrogeologic analysis. Concluding remarks and recommendations for future source investigations and remediation designs are found in Section 1.4.

Livermore Site Southeast Corner VOC Source Study-B419/511 Area