| Air Concentration Summaries from |
| Environmental Surveillance Reports |
| Eastgate |
| ------------------------------------------------------ |
| Calendar | Total Air | Total # | # Samples | Air Concentrations |
| Year | Volume (m3) | Samples | < MDA | ------------------------------------------------------ |
| Min | Max | Mean | Std.Dev. | Units |
| ==================================================================================================== |
| U |
| 1983 | 81613 | 4 | 6.5 | 44 | 17 | 18 | pg/m3 |
| 1984 | 82623 | 4 | 11 | 82 | 34 | 33 | pg/m3 |
| 1985 | 69477 | 4 | 35.4 | 41.2 | 39.4 | 2.7 | pg/m3 |
| 1986 | 73175 | 4 | 19.1 | 38.9 | 29.2 | 8.4 | pg/m3 |
| 1987 | 73328 | 4 | 28 | 47.9 | 36.9 | 8.4 | pg/m3 |
| 1988 | 71115 | 4 | 40.9 | 59.9 | 49 | 9.4 | pg/m3 |
| 1989 | 70151 | 4 | 50.7 | 72.4 | 62.5 | 8.9 | pg/m3 |
| 1990 | 84848.4 | 4 | 29.1 | 40.5 | 35.6 | 5.6 | pg/m3 |
| 1991 | 100833 | 4 | 26.7 | 61.5 | 42.9 | 4.3 | pg/m3 |
| 1992 | 69905 | 4 | 44.5 | 325.5 | 122.8 | 28.4 | pg/m3 |
| U-234 |
| 1992 | 69905 | 4 | 8 | 27 | 20.2 | 7 | aCi/m3 |
| 1993 | 26700 | 2 | 8.1 | 14.4 | 11.3 | aCi/m3 |
| 1994 | 59500 | 4 | 5.7 | 23.1 | 12.1 | 15.2 | aCi/m3 |
| 1995 | 4 | 5.2 | 19.4 | 9.8 | 13 | aCi/m3 |
| 1996 | 4 | 1 | 3.8 | 14.9 | 10 | 5.5 | aCi/m3 |
| 1997 | 4 | 1 | 3.7 | 11.1 | 6.6 | 3.2 | aCi/m3 |
| 1998 | 4 | 0 | 6.6 | 18.4 | 10.9 | 5.2 | aCi/m3 |
| 1999 | 4 | 0 | 5.3 | 18.4 | 11.1 | 5.6 | aCi/m3 |
| 2000 | 4 | 1 | 2.7 | 28.7 | 12.2 | 11.4 | aCi/m3 |
| ===================================================================================================== |
| Tuesday, December 24, 2002 | Page 5 of 6 |