Environmental surveillance data report for the second quarter of 1990

Each section of this report consists of a program description; results for the quarter; and an analysis of trends over the previous two years, depending upon the availability of data. Emissions of tritium to the atmosphere returned to levels consistent with the latter part of 1989. Osmium-191 releases were down by a factor of fifty due to changes in operations. Ambient air sampling around ORNL and the reservation showed that I-131 and H-3 continue to be at concentrations of less than 0.01% of the derived concentration guides (DCG) for these isotopes. Tritium and strontium concentrations at White Oak Dam were at 11% and 22% of their DCGs for the quarter respectively. All of the other radionuclides that were evaluated at the dam were at 2% or less of their DCGs. The NPDES compliance ratio for this quarter was 97% due to 20 noncompliances. Twelve of the exceedences were due to Category outfalls. Total radioactive strontium in milk was detected at two of the stations. The concentrations were less than 1% of the DCG for Sr-90. Samples from the perimeter wells of SWSA 6 were consistent with the data collected during the assessment phase with the exception of one well thatmore » showed twice the concentration of tritium previously seen (920 Bq/L versus 530 Bq/L). 20 figs., 39 tabs.« less