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FIELD EVALUATION OF IN-SITU BIODEGRADATION OF CHLORINATED ETHENES: PART I, METHODOLOGY AND FIELD SITE CHARACTERIZATION
Citation:
Roberts, P., G. Hopkins, D. Mackay, AND L. Semprini. FIELD EVALUATION OF IN-SITU BIODEGRADATION OF CHLORINATED ETHENES: PART I, METHODOLOGY AND FIELD SITE CHARACTERIZATION. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-90/261.
Description:
Careful site characterization and implementation of quantitative monitoring methods are prerequisites for a convincing evaluation of enhanced biostimulation for aquifer restoration. his paper describes the characterization of a site at Moffett Naval Air Station, Mountain View, California, and the implementation of a data acquisition system suitable for real-time monitoring of subsequent aquifer restoration experiments. hallow, confined aquifer was chosen for the enhanced biodegradation demonstration, and was shown to have suitable hydraulic and geochemical characteristics. njection and extraction wells were installed at a distance of 6 m, with intermediate monitoring wells at distances of 1,2.2, and 4 meters from the injection well. romide tracer tests revealed travel times of 8 to 27 hours from the injection well to the various monitoring wells, and 20 to 42 hours from the injection well to the extraction well. omplete breakthrough of the tracer at the monitoring wells was facilitated by choosing a line of wells aligned with the regional flow, and selecting injection and extraction flow rates of approximately 1.5 and 10 liters/min. ransport studies were conducted with selected halogenated organic compounds. he retardation factors were found to range from approximately 2 to 12. he breakthrough responses for the more strongly sorbing compounds, e.g. TCE, exhibited pronounced tailing, such that a minimum period of several weeks was required to achieve complete saturation of the aquifer.