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FIRST HALF 2006 SUBSIDENCE REPORT IV. Vegetation Monitoring: Vegetation monitoring (riparian survey) for the 16- and 17--Right Panel was performed during athree-day period from August 30, 2005 through September 1, 2005. The vegetation monitoring report, which evaluates any changes in riparian vegetation conditions and chazacteristics for Fish Creek, relative to the measured baseline conditions, is presented as an Appendix to this report. V. Hvdrologic Monitoring: During the first half of 2006, water quality data was collected from established sites along Fish Creek in areas underlain by gate-roads or longwall panels, as well as from representative downstream sites located away from the subsidence azea. Hydrologic monitoring of potential subsidence impacts from the 17 and 18-Right Panels utilizes three alluvial wells and three neazby surface sites. These sites aze shown on the attached First Half 2006 Subsidence Map. These include alluvial Well AVF-14 and associated surface Site SW-14 (upstream of 17-Right subsidence zone). Also utilized aze alluvial Well 008-AU3 and associated surface Site 305 (downstream of 17-Right subsidence zone). Note that Sites 305 and 008-AU3, were designated under TR03-42 as subsidence monitoring sites. Alluvial Well AVF-15 and associated surface site SW-15 are located between the two sets of upstream and downstream sites, presently within a ponded subsidence zone. Localized ponding occurred in this area in September/early-October of 2004, and has persisted through the first half of 2006. Hydrologic monitoring did not indicate significant water quality impacts to Fish Creek. Summary tables of monitoring data for the subject surface sites and alluvial wells aze attached. Note that seasonal fluctuations in the concentrations of some analytical parameters (e.g. iron, conductivity, TDS, etc.) do occur at the surface sites. Increases in iron concentration are often related to accumulation and leaching of iron-beating strata/sediments during spring runoff erosion. Some elevated iron concentrations may also be related to ponding effects (e.g. increased solids in ponded samples). V. Conclusions: Structures remained essentially unaffected during the period, with the exception of the predicted impacts to the powerlines pazallel to the 19-Right Panel. No adverse impacts, i.e. imminent failure of structures, were evident with regard to these structures. 2006_lstl-IaltSubReport.doc Page 2 of 3 11/14/2006