REP14584

• Permit No: C1980007
• IBM Index Class Name: Report
• Doc Date: 4/25/2003
• Doc Name: 2002 AHR Appendix A Thru D
• From: Mountain Coal Company
• To: DMG
• Annual Report Year: 2002
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

Horse Gulch
Surface Water Quality and Field Parameters
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Mountain Coal West Elk Mine
Monitoring Location Horse Gulch Baseline 2002 Water Year
Descri tion Units Minimum Maximum Mean 4/25/2002 6/17/2002 9/10/2002
Field Parameters
Flow m D D D
Electrical Conductivi umhos/cm 240 740 542
H SU 8.2 8.5 8.3
Tem erature oC 5.1 14.7 10
Laborato Paremeters
Name of Certified Lab
Lab Reference #
Sam Ie Date
Lab Test Date
Sam led B
Alkalini Total CaCO3 m /I 128 332 270
Aluminum, dissolved m /I 0.04 0.04 0.04
Anions me /I 6.5 6.5 6.5
Arsenic, total m /I 0.001 0.001 0.001
Bicarbonate m /I 128 331 268
Boron, dissolved m /I
Cadmium, dissolved m /I
Calcium, dissolved m /I 0.004 0.000
Carbonate m /I 9 2
Cation -Anion Balance m /I -4.8 -4.8 -4.8
Cations me /I 5.9 5.9 5.9
Chloride m /I 1 5 3
Conductivi umhos/cm 780 780 780
Co er, dissolved m /I
Hardness m /I 89 324 255
H droxide mg/I
Iron, dissolved m /I 0.05 0.05 0.05
Iron, total m /I 0.1 3.09 0.83
Lead, dissolved m /I
Ma nesium, dissolved m /I 7 29.4 22.7
Man anese, dissolved m /I 0.007 0.007 0.007
Man anese, total m /I 0.34 0.04
Mercu ,total m /I
Mol bdenum, dissolved m /I
Nitrate/Nitrite as N m /I 0.36 0.12
H SU 8.3 8.3 8.3
Phos hate m /I 0.11 0.11 0.11
Phos horns Ortho ,dissolved m /I 0.037 0.011
Potassium, dissolved m /I 3.6 3.6 3.6
Selenium, total m /I
Sodium Absor lion Ratio (SAR talc. 0.72 1.35 1.2
Sodium, dissolved m /I 15.5 54 41.1
Sulfate m /I 10 90 66
TDS Ratio talc.
TDS Calc. m /I
TDS m /I 170 440 354
TSS m /I
Zinc, dissolved m /I

ACZ Labs, Steamboat S rin s, Colorado
' Standard is for reference ur oses onl
NA - not a livable NM -not measured NR -not re orted

West Elk Mine
C-13 2002 Annual Hydrology Report HydroGeo, /nc.