REP47787

• Permit No: C1980007
• IBM Index Class Name: Report
• Doc Date: 9/13/2002
• Doc Name: 2001 AHR, Intro Thru Appendix D
• From: Mountain Coal Company
• To: DMG
• Annual Report Year: 2001
• 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 '
Monitorin Location Horse Gulch Baseline 2001 Water Year
Descri tion Units Minimum Maximum Mean 5/2/2001 6/25/2001 9/26/2001
Field Parameters
Flow m D D D
Electrical Conduclivi ~UmhOS/Cm 240 740 542
H SU' 8.2 8.5 8.3
Tem rature oC 5.1 74.7 70
Laboreto Parameters
Name of Certified Lab
Lab Reference H `
Sam le Date
Lab Test Date
Sam led B
Alkalini otal CaCO3 m ~ 128 332 270
Aluminum, dissolved m 0.04 0.04 0.04
Anions me 6.5 6.5 6.5
Arsenic, total m 0.001 0.001 0.001
Bicarbonate m !I 128 331 268
Boron, dissolved m A
Cadmium, dissolved m A
Calcium, dissolved m A 0.004 0.000
Carbonate m A ~ s 2
Cation -Anion Balance m A -4.8 -4.8 -4.8
Cations me 5.9 5.9 5.9
Chloride m 7 5 3
Conductiv' umhos/cm 780 760 780
Co er, dissolved m A
Hardness m /I 89 324 255
H droxide m A
Iron, dissolved m A 0.05 0.05 0.05
Iron total m /I 0.1 3.09 0.83
Lead, dissolved m
Ma neaiUm, dissolved m 7 29.4 22.7
Man anese, dissolved m /I 0.007 0.007 0.007
Man anese, total m A 0.34 0.04
Mercu total R
Mol bdenum, dissolved m A
NitrateMitrite as N m A 0.36 0.72
H SU 8.3 8.3 8.3
Phos hate m /I 0.17 0.11 0.11
Phos horns Ortho ,dissolved m A 0.037 0.077
Potassium, dissolved m 11 3.6 3.6 3.6
Selenium, total m
Sodium Absor tion Ratio SAR talc. 0.72 7.35 1.2
Sodium, dissolved m 15.5 54 47.7
Sulfate m A t0 so ss
TDS Ratio talc.
TDS Calc. m A
TDS m /I 170 440 354
TSS m A
Zinc, dissolved m A

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

West EIk Mine
C-19 2001 Annual Hydrology Report HydroGeo, lnc.