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2009-03-03_REPORT - C1982056 (2)
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2009-03-03_REPORT - C1982056 (2)
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Last modified
8/24/2016 3:44:04 PM
Creation date
3/3/2009 10:37:54 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
REPORT
Doc Date
3/3/2009
Doc Name
2008 Annual Hydrology Report
From
Twentymile Coal Company
To
DRMS
Annual Report Year
2008
Permit Index Doc Type
Hydrology Report
Email Name
JHB
Media Type
D
Archive
No
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. 3.8 2008 Inflow Survey <br />During the fall of 2008, an inflow study was conducted. Flow rates and field parameters were recorded for <br />measurable inflows from the accessible areas of the underground mine. Results of the 2008 survey are presented <br />on Figure 117, 2008 Inflow Study Mined Area (in map pouch at back of report). <br />The WMD was closed in 1996 at that time inflows were 52 gpm. Note that water elevations for the WMD were <br />monitored periodically at the Fish Creek Borehole. Our best estimate is that inflows for the WMD are still on the <br />order of 50 to 60 gpm. <br />Longwall mining was completed in the EMD by early-January 2001. Production from the NMD, 12 Rt Longwall <br />Panel, was underway by late January 2001. The EMD was permanently sealed in October 2001 removing all <br />access to the 6 Rt and 7 Rt gate roads. Thus, no measurements are available in this area for 2006. Historical data <br />is available in previous AHRs. The last flows measured for 2000 showed seasonal variations, with an average <br />annual flow of approximately 65 gpm. The EMD was monitored periodically at the TORT well shaft during 2008. <br />Northern Mining District (NMD): At the time of the 2008 inflow study, the mine operation was nearing the end <br />of the 23 Rt panel. During 2008, the main sources of water came from the two most recent shafts in the 6MN <br />area, and two fault crossings. Total inflow is estimated to be on the order of 80 gpm. Inflows continued in the <br />• Northeast Submains, although there appears to be a continued decrease in ceiling dripping. The highest inflows <br />were about 20 gpm for the new 6MN shaft, and about 15 gpm from a floor sump at inflow site 8 (IF8) with a <br />conductivity of 2270 (Trout Creek Water). This may have been impacted by the addition of roof drip collection <br />to the sump system. The next highest inflow was at raise bore area (IF 38 and IF 37), which was on the order of <br />10-gpm (down from an estimated 20 gpm in 2005), Field conductivity measurements were about 1500 <br />umhos/cm. This site is a blend of Wadge and Twentymile Sandstone water. Inflow at the remaining sites <br />(primarily roof drippers) were significantly lower, often less than a gallon per minute. <br />4.0 SUBSIDENCE IMPACTS <br />During the second-half of 2008, mining included the 22RT panel and the start of the 23RT panel. Water quality <br />data was collected from established sites along Fish Creek in areas underlain by gate-roads or longwall panels in <br />previous years. In 2008 there was no active mining beneath Fish Creek, and therefore no additional subsidence <br />beneath Fish Creek. No structures were undermined during the period, and thus no adverse impacts were evident <br />(For additional detail, review previous Subsidence Survey Reports, submitted to DRMS. <br />Fish Creek: Historically, hydrologic monitoring of potential subsidence impacts from the earlier 17 and 18 - <br />Right Panels utilizes four alluvial wells and four nearby surface sites. These sites are shown on the attached First <br />Half 2008 Subsidence Map. These include alluvial well AVF-14 and associated surface site SW-14 (upstream of <br />17-Right subsidence zone). Also utilized are alluvial well 008-AU3 and associated surface Site 305 (downstream <br />of 17-Right subsidence zone). Note that sites 305 and 008-AU3, were designated under TR03-42 as downstream <br />subsidence monitoring sites. <br />15
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