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LONG-TERM PERFORMANCE ASSESSMENT AT A HIGHLY CHARACTERIZED AND INSTRUMENTED DNAPL SOURCE AREA FOLLOWING BIOAUGMENTATION: ESTCP COST AND PERFORMANCE REPORT
Schaefer, C.E., G.M. Lavorgna, M.D. Annable, and A. Haluska.
ESTCP Project ER-201428, 67 pp, 2018

Monitoring was performed using soil sampling, passive flux meters, and push-pull tracer testing up to 3.7 years following active bioremediation of chlorinated ethene DNAPL source areas located at Alameda Point, Calif. Results showed that despite the absence of lactate, lactate fermentation transformation products, or hydrogen, biogeochemical conditions remained favorable for the reductive dechlorination of chlorinated ethenes. While ethene levels suggested relatively low dechlorination of the parent TCE and daughter products, compound-specific isotope analysis (CSIA) showed that the extent of complete dechlorination was much greater than indicated by ethene generation. Results of the push-pull tracer testing confirmed that DNAPL remained in a portion of the source area, consistent with soil and groundwater data. Reliance on ethene generation alone as an indicator of complete dechlorination significantly underestimated the extent of complete dechlorination, as CSIA analysis provided a more reliable estimate of dechlorination than reliance on ethene generation alone. https://www.serdp-estcp.org/content/download/47711/454836/file/ER-201428%20Cost%20&%20Performance%20Report.pdf **See also the manuscript version of a paper prepared by the project participants to describe the conceptual model at https://www.serdp-estcp.org/content/download/47717/454884/file/ER-201428%20Conceptual%20Model%20Report.pdf.



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