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Handbook of Solvents - George Wypych - ChemTech - Ventech!

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1602 Hanadi S. Rifai, Charles J. Newell, Todd H. Wiedemeier<br />

Figure 23.1.7. Conceptual model <strong>of</strong> Type 3 environment<br />

for chlorinated solvent plumes. [From T.H.<br />

Wiedemeier, H. S. Rifai, C. J. Newell and J.T. Wilson,<br />

Natural Attenuation <strong>of</strong> Fuels and Chlorinated <strong>Solvents</strong><br />

in the Subsurface, after reference 88. Copyright<br />

© 1999 John Wiley & Sons, Inc. Reprinted by permission<br />

<strong>of</strong> John Wiley & Sons, Inc.]<br />

Figure 23.1.8. Conceptual model <strong>of</strong> mixed environments<br />

with Type 1 environment in source zone and<br />

Type 3 environment downgradient <strong>of</strong> source. [From<br />

T.H. Wiedemeier, H. S. Rifai, C. J. Newell and J.T.<br />

Wilson, Natural Attenuation <strong>of</strong> Fuels and Chlorinated<br />

<strong>Solvents</strong> in the Subsurface, after reference 88.<br />

Copyright © 1999 John Wiley & Sons, Inc. Reprinted<br />

by permission <strong>of</strong> John Wiley & Sons, Inc.]<br />

significant direct aerobic biodegradation was assumed. While a long chloride plume will be<br />

observed, the short anaerobic zone means much less methane is produced, allowing dilution/dispersion<br />

to limit the extent <strong>of</strong> the methane plume.<br />

23.1.6 CHLORINATED SOLVENT PLUMES - CASE STUDIES OF NATURAL<br />

ATTENUATION<br />

23.1.6.1 Plume databases<br />

Two different databases provided chlorinated solvent site data. The first database, the<br />

Hydrogeologic Database (HGDB), 2 provided information on plume length, plume width,<br />

plume thickness, and highest solvent concentration for 109 chlorinated solvent sites. The<br />

second database 1 condensed extensive site characterization data from 17 Air Force chlorinated<br />

solvent sites, with information on parent compounds vs. progeny products concentrations,<br />

competing electron acceptors, hydrogen, and metabolic by-products.

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