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REP16587
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Last modified
8/24/2016 11:45:51 PM
Creation date
11/27/2007 1:55:33 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981041
IBM Index Class Name
Report
Doc Name
1996 Annual Hydology Report & Mine Inflows Study
Annual Report Year
1996
Permit Index Doc Type
HYDROLOGY REPORT
Media Type
D
Archive
No
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• POWDERHORN COAL COMPANY <br />1996 ANNUAL HYDROLOGIC REPORT <br />AND MINE INFLOWS STUDY <br />OCTOBER 1,1995 THROUGH SEPTEMBER 30,1996 <br />Introduction <br />During the 1996 Water Yeaz, the Yeaz, the Roadside South Portal and the Roadside North Portal <br />were both being operated. Production at the Roadside North continued to be done using room and <br />pillar mining with•a continuous miner and shuttle cazs. Production at the Roadside South continued <br />with development only using a continuous miner and continuous haulage. Both mines had difficult <br />geologic, hydrologic and gas problems. <br />The Peabody Western's hydrologic reporting system again was used as a tool for compiling and <br />reporting part of the information for this Yeaz's report. The general format of this report is the same <br />as in previous years. <br />This reporting period includes monitoring requirements which were added to our Mining and <br />Reclamation Permit to cover springs and creeks on the Roadside North portions of the permit area. <br />• <br />Surface Water <br />Water flow and quality on the Colorado River is monitored by the U.S. Geologic Survey (USGS) <br />at various locations. The closest location is Station No. 09095500 which is located upstream <br />approximately 7 miles north east of the mine site. Water quality and flow from this site aze used as <br />a general representation of the Colorado River up gradient of our mining operation. There is a <br />diversion to the Government Highline Canal, the addition of Plateau Creek and the addition of other <br />minor drainages between the monitoring site and the mine site. Data Pages SQ-13 thru 17 include <br />information supplied by USGS on this site in 1996. The total flow at this site for the Yeaz was <br />3,464,000 acre-feet which amounts to 123% of the 1934-1996 average flow. The estimated TDS <br />load for the yeaz was 1.666 million tons. This estimate is made using the sum of the monthly <br />average conductivity times monthly flow times a calculated conductivity -tons/a.f. ratio. A <br />conductivity - tonsla.f. ratio of 0.000829 was calculated from information on data pages SQ-14 thru <br />-17. The low flow for the year was recorded as 1880 CFS on February 4, 1996. As can be seen on <br />data page SQ-16, the conductivity recorded this day was 992 umhos/cm. This flow and conductivity <br />equates to approximately 3067 tons of Total Dissolved Solids, TDS, being carried by the river past <br />the mine that day. Mine discharges on January 24, 1996 (the closest monthly analysis), were: 001 - <br />O GPM; 002 - 181 GPM @ 1660 mg/I TDS; and 004 - 99 GPM @ 2170 mg/1 TDS, resulting in <br />approximately 3.079 tons of TDS being dischazged. Comparing the calculated TDS load in the <br />• River at low flow and the mine dischazge neaz the same date, the maximum increase in the River's <br />TDS as a result of mine dischazge would have been 0.10%. <br />
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