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DESIGN AND COST REDUCTION OF REMEDIATION TECHNOLOGY PILOT TESTING
Citation:
AZADPOUR-KEELEY, ANN. DESIGN AND COST REDUCTION OF REMEDIATION TECHNOLOGY PILOT TESTING. Presented at The Society for Industrial Microbiology and Biotechnology Annual Meeting, Denver, CO, July 29 - August 03, 2007.
Impact/Purpose:
To present information at the Society of Industrial Microbiology and Biotechnology Annual Meeting
Description:
In order to effectively address the inherent variability of MTBE concentrations at a small fuel contamination site chosen for an in-situ remedial technology test demonstration, curtain walls for metering mixtures of conservative and non-conservative tracers into an aquifer were used during a ground-water investigation of over 300 days. The study was conducted to guide a monitoring plan development for the bioremediation technology pilot test which would involve intermittent sparging of oxygen and propane into the test area. Two experimental plots consisting of closely sparged tracer-injection and downgradient monitoring screens were used. Two tracer experiments (bromide and bromide/d-MTBE) were conducted by injecting small volumes of high tracer concentration solutions into the injection wells and monitoring the tracer response at 72 downgradient sample screens located in the two 20 x 20 ft. (6 x 6 m) plots. The findings from 15 sampling events over a 10-month project demonstrated that large variations occurred in short periods of time and over short distances (i.e., <10 m). MTBE, d-MTBE, and bromide which were purposefully or inadvertently introduced to the aquifer varied quite markedly in time and space. Geochemical parameters on the other hand, which derive from water/aquifer matrix interactions, were found to demonstrate very low relative variability. The tracer experiments led to substantial cost-saving in monitoring the performance of the remedial technology demonstration.