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Spring G-20 Water Guallly and Field Parameters Mountain Coal West Elk Mine C Monitod Location S rln G-20 - Baseline 2007 Water year Descd bon Units Minimum Mapmum Mean 4/28/2001 6/24/2001 9/30/2001 Field Parameters Fly, Electrical Conductivi umhos/an t.67 7050 t2s 7030 o.ss sso H $U 8.1 8.1 8.3 Tem reture oC 10.4 19.6 14.1 Comment Laborato Parameters Name of Certified Lab Lab Reference # Acz L32666.04 Sam le Date 6/24/2007 Lab Test Date ~ 6/27.7/11 Sam led B R.H. Alkalini otal CaCO3 m Aluminum dissolved m Anions m Arsenic dissolved m Arsenic, total rn BlCatt)Onate m 452 657 539 Boron dissolved m Cadmium, dissoved m Caldum dissolved m et 81 et Carbonate rn Cation -Anion Balance m Cations me Chlodde Conductivi m umhos/cm t.2 970 10 7090 5.3 1023 1020 Co r dissoved m Hardness m 193 416 318 H dro>ade m Iron, dissolved ~ m 0.05 0.07 -O.Ot Iron total m ~ 0.32 0.05 0.14 Lead, dissoved ~ rn Ma ne3iUm, dissolved m 33.3 33.3 33.3 Man nese, dissolved m 0.002 0.002 0.002 Man anese total m 0.06 0.005 Mercu ,total m Mol enum, dissolved m Nitrate as N m Nitrate/Nitrite as N m o.ot o.os 0.03 Nitrite as N m I.{ SU 7 8.7 7.7 7.9 Phos hate m Phos hoots Ortho , dissoved m o.t5 0.02 Potassium, dssolved m Selenium total rn Sodium Abso Goo Ratio SAR ~ talc. 2.31 2.73 - 2.52 Sodium dissoved m toe 702 toe Sulfate m t6 to et TDS Ratio tale. TDS Calc. m ' TDS m 502 686 598 620 TSS m 19.6 3.5 6 Zinc dssdved m AAL.Ino-AmedcanASSa Laboratories In c.,S rks Nevada Standard is for reference ses onl NA - not a livable NM -rat measured NR - not re rted West EIk Mlne E-13 2001 Annual Hydrology Report HydroGeo, Inc.