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5 <br /> 610 mV) were all below the detection limit of 5 pg/L. <br /> Pink-colored groundwater was observed at several observation wells (most notably at well <br /> EU-1 and EE-1) within the study area, which is generally indicative of the presence of <br /> potassium permanganate within groundwater. <br /> The following table summarizes the observations at the 7 wells within the pilot study area: <br /> No EW-1 Pumping M-1A Pumping ED-2 Pumping <br /> Gallons Pumping Pumped p g 221,900 gallons 13,000 gallons <br /> p August — December 9 - 13, February 7 - 8, 4,100 gallons <br /> Dates 1999 2000 <br /> Pumped November, February 14, 2000 <br /> Rate Pumped 1999 @39 gpm @25 gpm @25 gpm <br /> Monitoring TCE TCE Eh TCE Eh TCE Eh <br /> Well <br /> WA 200 160 81 140 534 100 140 <br /> ED-1 210 < 0.5 601 15 605 220 466 <br /> ED-2 270 330 89 40 549 190 410 <br /> EE-1 < 0.5 < 0.5 626 < 0.5 646 < 0.5 612 <br /> EI-1 110 8.2 566 320 419 170 148 <br /> EU-1 < 0.5 < 0.5 616 0.6 597 82 187 <br /> EW-1 240 4.0 Nm 300 554 270 310 <br /> Nm - not measured <br /> 4 EVALUATION OF IN SITU OXIDATION USING POTASSIUM PERMANGANATE <br /> Addition of KMn04 to groundwater produces temporary changes in groundwater <br /> chemistry. The immediate effect of the injection is to greatly increase the concentrations <br /> of the potassium ion (K+) and the permanganate ion (Mn04) in groundwater near the <br /> injection points. <br /> Permanganate did not persist at wells beyond the locations of EU-1 and EE-1 (the two <br /> most upgradient wells closest to the area of the four injection points). TCE concentrations <br /> were detected below the detection limit of 0.5 pg/L throughout the six month study at well <br /> EE-1, and conversely resulting in concentrations above detection limits at all other <br /> monitoring well locations (see Section 3.4). Chloride and TDS concentrations were <br /> elevated in the presence of KMn04; however returned to normal background levels after <br /> the permanganate was consumed. <br /> 4.1 Field Parameters as an Indication of Permanganate <br /> Dissolved oxygen (DO) field measurements over time for ten monitoring wells; show an <br /> increase in DO (up to 6.3 mg/L) was observed during the first week after permanganate <br />