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SECOND HALF 2005 SUBSIDENCE REPORT <br />IV. Vegetation Monitoring: <br />Vegetation monitoring (riparian survey) for the 16-Right and 17-Right panels was <br />performed during athree-day period from August 30, 2005 through September 1, 2005. <br />The vegetation monitoring report, which evaluates any changes in riparian vegetation <br />conditions and characteristics for Fish Creek relative to the measured baseline conditions, <br />is presented as an Appendix to this report. <br />V. Hvdrologic Monitoring: <br />During the second-half of 2005, water quality data was collected from established sites <br />along Fish Creek in areas underlain by gate-roads or longwall panels, as well as from <br />representative downstream sites located away from the: subsidence area. <br />Hydrologic monitoring of potential subsidence impacts from the 17-Right Panel utilizes <br />three alluvial wells and three nearby surface sites. These sites are shown on the attached <br />Second Half 2005 Subsidence Map. These include alluvial well AVF-14 and associated <br />surface site SW-14 (upstream of 17-Right subsidence zone). Also utilized are alluvial <br />well 008-AU3 and associated surface Site 305 (downstream of 17-Right subsidence <br />zone). Note that sites 305 and 008-AU3, were designated under TR03-42 as subsidence <br />monitoring sites. <br />Alluvial well AVF-15 and associated surface site SW-15 are located between the two sets <br />of upstream and downstream sites, presently within a ponded subsidence zone. Localized <br />ponding occurred in this area in September/early-October of 2004, and has persisted <br />through the second half of 2005. <br />Hydrologic monitoring did not indicate significant water quality impacts to Fish Creek. <br />Summary tables of monitoring data for the subject surface sites and alluvial wells are <br />attached. In August 2005, iron concentrations for surface sites SW-14, SW-15, and 305 <br />ranged from 820 ug/1 to 1670 ug/1. Seasonal fluctuations of iron concentration occurs at <br />the surface sites. Increases in iron concentration are often related to accumulation and <br />leaching of iron-bearing strata/sediments during spring runoff erosion. Some elevated <br />iron concentrations may also be related to ponding effects (e.g. increased solids in ponded <br />samples). <br />2005_2ndHalfSubReport.doc Page 2 of 3 02/28/2006 <br />