2016-12-01_PERMIT FILE - C1980007 (6)

Home Browse Search

Minnesota Reservoir Flume WY 2015 Surface Water Quality and Field Parameters Mountain Coal West Elk Mine Monitoring Location: Minnesota Reservoir Flume Baseline 2015 Water Year Description Units Minimum Maximum Means 4/25/2015 5/25/2015 JQ4 8/19/2015 Field Parameters Flow gpirn / staff 83 3,591 1,364 0.17' 0.80' 0 33' Conductivity (Field) µmhos/cm 114 682 360 262 155 142.6 H Field SU 7.97 8.75 8.29 8.43 8.92 8.48 Temperature Field °C 14.8 24.1 18.5 5.6 8.2 12.6 omment Laboratory Parameters Name of Certified Lab 3 ACZ Lab Reference # L24596-07 Sample Date 5/25/2015 Lab Test Date 5/29-6/6 Sampled By PH Alkalinity Total CaCO3 m /L 46 230 140 Aluminum, dissolved m /L -003 0.08 0.05 Sum of Anions me /L 0.90 4.80 3.06 Arsenic, dissolved m /L -0.001 0 001 0.001 Bicarbonate as CaCO3 m /L 46 213 134 Boron, dissolved m /L -001 0.02 0.01 Cadmium, dissolved m /L -001 -001 -0.01 Calcium, dissolved m /L 8.9 53.7 31.2 Carbonate as CaCO3 m /L -2 18 8 Cation - Anion Balance % -5.9 2.1 -1.1 Sum of Cations me /L 0.8 4.7 3.0 Chloride m /L 1 00 3.00 1 86 Conductivity @25C µmhos/cm 95 456 295 158 Copper, dissolved m /L -0.01 -0.01 -0.01 Hardness as CaCO3 m /L 31 192 111 Hydroxide as CaCO3 m /L -2 -2 -2 Iron, dissolved m /L 0.03 0.26 0.10 0.03 B Iron, total m /L 0.36 3.62 1.58 7.75 Lead, dissolved m /L -004 -0.04 -0.04 Magnesium, dissolved m /L 2.1 14.1 8 1 Manganese, dissolved m /L -0.01 0.09 0.03 Manganese, total m /L 0.031 0.397 0.136 Mercury, total m /L -00002 -00002 -0.0002 Molybdenum, dissolved m /L -0.01 -0.01 -001 Nitrate as N), dissolved m /L -0.02 0.64 0.22 H SU 8.0 8.5 8.3 8.3 H Phosphate m /L -003 0.40 0 12 Phosphorus, ortho dissolved m /L -0.01 0.13 0.04 Potassium, dissolved m /L 0.6 2.0 1 3 Selenium, dissolved m /L -0.001 -0.001 -0001 Sodium Adsorption Ratio (S F) calc. 0.38 1.16 0.72 Sodium, dissolved m /L 48 32.4 173 Sulfate m /L -10 30 6 TDS ratio - measured/calculated m /L 0.99 1 74 1.24 TDS calculated calc. 46 244 158 Residue, Filterable TDS 180C m /L 70 250 176 134 Residue, Non -Filterable TSS 105C m /L -5 60 26 146 Zinc, dissolved m /L -0.01 0.02 0.01 Baseline 2006. 2 Negative values denote readings below lab detection levels. 3 ACZ Laboratory, Steamboat Springs, CO. ° ACZ Lab Qualifiers: LI - Analyte was analyzed for but not detected at the indicated MDL Sulfate B - Analyte conc detected at a value between method detection limit (MDL) and practical quantitation limit (PQL) The associated value is an estimated quantity. 5 Average (mean) value calc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit. Shaded cells indicate parameters elevated greater than ten percent above the maximum baseline value. West Elk Mine B-6 PR -12 Exhibit 71. Technical Revision No. 139 HydroGeo, Inc.