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2011-02-25_REPORT - C2009087
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2011-02-25_REPORT - C2009087
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Last modified
8/24/2016 4:31:13 PM
Creation date
2/25/2011 3:15:05 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C2009087
IBM Index Class Name
Report
Doc Date
2/25/2011
Doc Name
2010 Annual Hydrology Report
From
Sage Creek Coal Company, LLC
To
DRMS
Annual Report Year
2010
Permit Index Doc Type
Hydrology Report
Email Name
JDM
Media Type
D
Archive
No
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- Surface Water Site YSGF5. This site was initially part of the <br />monitoring program for Seneca Coal Company's Yoast Mine, and is now part <br />of the PSCM program. It is in the upper part of Grassy Creek, just below <br />the confluence of the Yoast NPDES Pond 010 discharges. Review of the TDS <br />plot indicates a stable trend (SF = 0.5). <br />- Surface Water Site SW-S2-1 (SSG1). This site monitors Grassy Creek <br />upstream of mining at the Seneca II Mine. Review of the TDS plot <br />indicates a slightly increasing trend. <br />- NPDES Discharge Point 003 (NPDES3). Hydrographs presented in Appendix <br />D show that flow has increased at this site since September 18, 1984, <br />when operation of the truck wash system began. Water is siphoned from <br />the Wadge Impoundment (NPDES2) into a holding pond. Overflow from the <br />holding pond is diverted into the shop ditch, which flows into NPDES3. <br />Water is pumped from the holding pond to the wash rack, drains into a <br />settling pond, and then into the same shop ditch. This operation has <br />increased the flow at NPDES3 while decreasing the flow at NPDES2. <br />Other events have affected the long-term hydrograph at NPDES3. They <br />include the diversion away from NPDES3 of the runoff from an inactive <br />fly ash pit (operated by the Hayden Station power plant) in October 1980 <br />and the diversion away from NPDES3 of runoff contained in the Northwest <br />Diversion Ditch (see' the Seneca II Permit Application, Exhibit 7-7, <br />Surface Water Hydrology Map and also the 1982 Seneca II AHR) in April <br />1982. Discharge volumes at the this site have also been affected by the <br />reduction in diameter of the discharge culvert (36 inches to 6 inches) <br />that occurred on July 19, 1988. A smaller volume pump and line from Pond <br />002 to the truck wash was installed in August 2001. The truck wash was <br />last used in 2007. These pump lines, which were siphoning water out of <br />Pond 002, were capped off on July 7, 2010. <br />This year's average flow value, 0.041 cfs, is 28% of the historic (1980- <br />2010) average flow value, 0.145 cfs. Review of the TDS plot indicates a <br />decreasing trend, with the peak value occurring in September 2002. <br />14
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