Scientific Investigations Report 2006-5056
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006-5056
Table 5. Chloroethene flux comparison to southern marsh surface water estimated from ground-water flux and chloroethene concentrations from passive-diffusion samplers and surface-water flux and chloroethene concentrations from surface water, Operable Unit 1, Naval Undersea Warfare Center, Division Keyport, Washington, 1999–2000 and 2004.
[Water flux: Ground-water and surface-water flux estimates (from URS, Inc., 1997b, Appendix F). Measured chloroethene concentrations: For ground water, weighted average of concentrations for marsh passive-diffusion sampler sites S-4–S-6 for 2004 (table 4 and Dinicola and others, 2002), and for marsh passive-diffusion sampler sites S-2–S-6 for 2000 (CH2M Hill Constructors, Inc., 2005); for surface water, concentrations from site MA-12 (CH2M Hill Constructors, Inc., 2005). Estimated chloroethene flux: For ground water, “South” sub-transect pair (table 5, fig. 12); for surface water, measured concentration multiplied by water flux. Abbreviations: TCE, trichloroethene; cis-DCE, cis-1,2-dichloroethene; VC, vinyl chloride; gal/min, gallon per minute; mg/L, microgram per liter; g/d, gram per day]
| Chloroethene data used to estimate flux |
Water flux (gal/min) | Measured chloroethene concentration | Estimated chloroethene flux | ||||||
|---|---|---|---|---|---|---|---|---|---|
| TCE (mg/L) | cis-DCE (mg/L) | VC (mg/L) | TCE (g/d) | cis-DCE (g/d) | VC (g/d) | ||||
| 1999–2000 | |||||||||
| Marsh passive-diffusion samplers | 0.2 | 19 | 3,900 | 1,200 | 0.02 | 4.2 | 1.3 | ||
| Surface water at site MA-12 | 1.3 | 110 | 670 | 140 | .78 | 4.7 | 1.0 | ||
| Percentage of difference between estimated chloroethene fluxes |
97 | 11 | -29 | ||||||
| 2004 | |||||||||
| Marsh passive-diffusion samplers | 0.2 | 14 | 4,900 | 3,500 | 0.02 | 5.3 | 3.8 | ||
| Surface water at site MA-12 | 1.3 | 70 | 540 | 78 | .50 | 3.9 | .6 | ||
| Percentage of difference between estimated chloroethene fluxes |
97 | -37 | -580 | ||||||
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