Technical Bulletin: c-DCE stall out

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Trichloroethene (TCE) and Perchloroethene (PCE) chlorinated solvents have been responsible for the serious contamination of soils and groundwater. The occurrence of cis-DCE “stall”, the condition of where it appears biodegradation beyond cis-DCE to vinyl chloride does not occur resulting in cis-DCE accumulation, is often misinterpreted.

How do you know if your site has c-DCE “Stall”?
1) Evaluate the sorption relationships of the daughter products and PCE/TCE.
2) Determine if sulfate/sulfite are competing as terminal electron acceptors with c-DCE.
3) Evaluate the ORP and the pH of up-gradient, down-gradient and cross-gradient wells.
4) Correlate iron species with sulfate/sulfite data in unfiltered, bicarbonate extractions.

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