. Hydrochemical, vegetational and microbiological effects of a natural and a constructed wetland on the control of acid mine drainage . Mine drainage; Acid mine drainage; Wetlands. D SITE AH-14 Z O t< t- z o z o o 40 80 120 160 200 240 TIME (hrs.)-fronn start of tracer input 280 320 Figure 5-13. Tracer study breakthrough curve for site AH-14, m from tracer input showing little effect of sorption. resulted in only one point above the lower limit of detection. All the neighboring sites, to m (5 to 12 ft) away generated many bromide breakthrough curve point
. Hydrochemical, vegetational and microbiological effects of a natural and a constructed wetland on the control of acid mine drainage . Mine drainage; Acid mine drainage; Wetlands. D SITE AH-14 Z O t< t- z o z o o 40 80 120 160 200 240 TIME (hrs.)-fronn start of tracer input 280 320 Figure 5-13. Tracer study breakthrough curve for site AH-14, m from tracer input showing little effect of sorption. resulted in only one point above the lower limit of detection. All the neighboring sites, to m (5 to 12 ft) away generated many bromide breakthrough curve points up to mg/L. This suggests zones of very low flow which are described as "dead zones" by Bowmer (1987). At some sample sites the sampling interval was not frequent enough to determine the exact break- through peak. In the case of site AH-9 (Figure 5-14) the resultant curve is flat topped between hours 169 and 220. Both of these times were used to calculate velocity in addition to the peaks at 30 and 54 hours. Subtraction of the background values resulted in no detectable tracer peaks on the breakthrough curve for some of the well sampling sites such as C-l-D, D-l-S, and D- 2-S. Placement of the breakthrough curve peak is important in that the associated time represents the passing of the tracer plume. This time is also used for determination of average velocity. Widely spaced sampling intervals may cause the exact breakthrough curve peak to not be found and the velocities determined may be too large or too small. Bromide values below the mg/L limit of detection were not considered as possible peaks on the breakthrough curves. A common observation of the 56. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Montana State University (Bozeman, Mont. ). Reclamation Research Unit; Dollhopf, D. J;
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