| Air Concentration Summaries from |
| Environmental Surveillance Reports |
| TA-16 S-Site |
| ------------------------------------------------------ |
| Calendar | Total Air | Total # | # Samples | Air Concentrations |
| Year | Volume (m3) | Samples | < MDA | ------------------------------------------------------ |
| Min | Max | Mean | Std.Dev. | Units |
| ==================================================================================================== |
| Am-241 |
| 1972 | 97 | 40 | aCi/m3 |
| 1973 | 4 | 3 | 2 | aCi/m3 |
| 1975 | 7 | 4 | 2 | aCi/m3 |
| 1977 | 93794 | 3 | 3 | -0.6 | 0.1 | -0.1 | 0.7 | aCi/m3 |
| 1978 | 94752 | 4 | 4 | -2 | 1.3 | -0.4 | 2.7 | aCi/m3 |
| 1979 | 92287 | 4 | 4 | -3.9 | -0.8 | -2.4 | 3.8 | aCi/m3 |
| 1980 | 71151 | 4 | 4 | -2.8 | 1.1 | -0.5 | 1.8 | aCi/m3 |
| 1981 | 48139 | 4 | 4 | 0 | 5.2 | 1.9 | 4.6 | aCi/m3 |
| 1982 | 87990 | 4 | 4 | 0 | 1 | 0.3 | 0.7 | aCi/m3 |
| 1986 | 78679 | 3 | 2 | 1.2 | 4 | 2.7 | 1.4 | aCi/m3 |
| 1987 | 103821 | 4 | 4 | 0.6 | 1.6 | 1 | 0.4 | aCi/m3 |
| 1988 | 15404 | 1 | 1 | 1.9 | 1.9 | 1.9 | aCi/m3 |
| 1989 | 63901 | 4 | 2 | 1.1 | 4.2 | 2.4 | 1.5 | aCi/m3 |
| 1990 | 58523 | 3 | 2 | 0 | 6.8 | 2.8 | 3.5 | aCi/m3 |
| 1991 | 101140 | 4 | 4 | 0.2 | 1.7 | 1.2 | 0.6 | aCi/m3 |
| 1992 | 12793 | 1 | 1 | 1.1 | 1.1 | 1.1 | aCi/m3 |
| 1995 | 3 | 1 | 2.9 | 5.5 | 4.6 | 2.9 | aCi/m3 |
| BE |
| 1989 | 49234 | 3 | 0.01 | 0.01 | 0.01 | 0.003 | ng/m3 |
| 1990 | 57834 | 3 | 0.01 | 0.02 | 0.01 | 0.01 | ng/m3 |
| 1991 | 74668 | 3 | 0.02 | 0.02 | 0.02 | 0.01 | ng/m3 |
| ===================================================================================================== |
| Tuesday, December 24, 2002 | Page 2 of 8 |