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FIRST-HALF 2005 SUBSIDENCE REPORT III. Mau: The monitoring locations for the first-half of 2005 aze displayed on the First-Half 2005, Subsidence Map. The map also indicates the location of the longwall face on a monthly basis. IV. Vegetation Monitorine: Vegetation monitoring (riparian survey) for the 16-Right and 17-Right panels will be performed during the summer of 2005. The vegetation monitoring report, which evaluates any changes in riparian vegetation conditions and characteristics for Fish Creek relative to the measured baseline conditions, will be included with the Second-Half 2005 Subsidence Report. V. 13vdroloaic Monitorine: Hydrologic monitoring of potential subsidence impacts from the 17-Right panel utilizes two alluvial wells and two surface sites. These include alluvial well AVF-14 and associated surface site SW-14 (upstream of 17-Right subsidence zone). Also utilized are surface site 305 and its associated alluvia] well, 008-AU3. Sites 305 and 008-AU3 represent non-subsidence downstream sites. Note that the water quality data-base for sites 305 and 008-AU3 is limited, as requirements to monitor downstream subsidence impacts were initiated with TR03-42. These sites aze shown on the attached First-Half 2005 Subsidence Map. Surface site SW-I S and associated alluvial well AVF-15 are located between the two sets of upstream and downstream sites, within the ponded subsidence zone. Prior to subsiding the SW-15/AVFI S azea (summer 2004), the UPRR raised the section of track crossing Fish Creek and extended the two existing Fish Creek culverts running under the track. Following installation of the extensions, flow was temporarily halted along Fish Creek (below the culverts), and resumed in late September/early October of 2004. The SW- 15/AVF-15 azea subsequently ponded. This azea continues to be ponded during the first half of 2005. Hydrologic monitoring did not indicate significant water quality impacts to Fish Creek. Summary tables of monitoring data for the subject surface sites are attached. Iron concentrations (in 3000 ug/1 range) appeaz comparable for all three surface sites. Iron concentrations typically peak during spring runoff. Note that late March of 2005 was unusually warm, prompting eazly runoff conditions. Also attached aze summary tables for alluvial well sites. Water quality sampling is required on asemi-annual basis for alluvial wells, with field pazameters measured on a quarterly basis. The first water quality sampling session is anticipated in July 2005, and 2005_1stHaltSubReport.doc Page 2 of 3 7/21/2005