Results of the quarterly tritium survey of Fourmile Branch and its seeplines in the F- and H-Areas of SRS: March 1994

The Environmental Sciences Section (ESS) of the Savannah River Technology Center (SRTC) established a quarterly monitoring program of the Fourmile Branch (FMB) stream and its associated seepline down gradient from the F- and H-Area seepage basins. The program surveys and tracks changes in tritium, specific conductivity, and pH primarily for seepline water; however, a few stream locations have been added. Measurements from the eighth quarterly survey (March 1994) showed similar to slightly lower tritium and conductivity measurements and similar pH values compared to previous studies. Decreased tritium concentrations and conductivity values, as compared to the previous survey, are attributed to the seasonal rise in the water table since the December 1993 sampling event. However, overall results of the tritium survey and stream monitoring data suggest that the tritium plume resulting from the operation of the seepage basins is flushing from the FMB system