Scientific Investigations Report 2007–5009
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5009
Table 4. Measured concentrations of sulfur hexafluoride (SF6) along the U.S. Geological Survey well transect and concentrations estimated using simulated travel time and historical atmospheric concentrations of SF6, San Joaquin local study area, California.
[m, meter; yr, year; pptv, parts per trillion by volume]
| Location of well on transect |
Midpoint of screen below land surface (m) |
Simulated travel time (yr) | Concentrations of SF6 (pptv) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Median | Maximum | Minimum | Estimated | Measured | |||||
| Average | Maximum | Minimum | |||||||
| Upper end | 7 | 0.4 | 0.5 | 0.2 | 5.7 | 4.2 | 4.6 | 3.7 | |
| Upper end | 20 | 12.7 | 16.4 | 10.0 | 2.6 | 2.6 | 3.4 | 1.7 | |
| Upper end | 27 | 12.9 | 18.5 | 11.6 | 2.6 | 2.1 | 2.5 | 1.7 | |
| Middle | 13 | 4.3 | 6.5 | 3.6 | 4.7 | 3.5 | 3.5 | 3.5 | |
| Middle | 19 | 8.9 | 12.3 | 5.8 | 3.7 | 2.5 | 2.6 | 2.3 | |
| Middle | 25 | 24.1 | 76.3 | 14.6 | 0.9 | 1.4 | 1.4 | 1.3 | |
| Lower end | 9 | 9.1 | 19.2 | 6.2 | 3.4 | 1.1 | 1.2 | 1.0 | |
| Lower end | 15 | 20.5 | 49.3 | 11.4 | 1.5 | 1.4 | 1.7 | 1.0 | |
| Lower end | 25 | 23.6 | 104.0 | 17.6 | 0.9 | 0.4 | 0.4 | 0.3 | |
| Lower end | 29 | 39.9 | 135.5 | 1.0 | 1.1 | 0.6 | 0.7 | 0.4 | |
U.S.
Department of the Interior | U.S. Geological
Survey
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