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July 2015 Table 4: Summary of Monitoring Results for MW -4 Date Benchmark Level Benchmark Basis 2/18/2014 5/21/2014 8/27/2014 11/11/2014 2/18/2015 5/27/2015 Metals Arsenic, Dissolved (mg/L 0.17 Statistical Limit < 0.01 U < 0.01 U NA NA NA NA Barium, Dissolved (mg/L 2.0 Regulatory Limit 8.58 9.64 8.01 8.56 8.77 8.76 Boron, Dissolved (mg/L 0.75 Statistical Limit 0.63 0.6 0.7 0.7 0.8 B 0.6 Chromium, Dissolved (mg/L 0.3 Statistical Limit < 0.02 U < 0.02 U NA NA NA NA Copper, Dissolved (mg/L 0.3 Statistical Limit < 0.3 U < 0.5 U NA NA NA NA Iron, Dissolved (mg/L 0.61 Statistical Limit 0.8 0.2 B 0.5 0.3 B < 1 U 0.3 B Lead, Dissolved (mg/L 0.05 Regulatory Limit < 0.005 U < 0.005 U NA NA NA NA Lithium, Dissolved (mg/L 2.5 Statistical Limit NA NA NA NA NA NA Manganese, Dissolved (mg/L 1.2 Statistical Limit < 0.1 U < 0.3 U < 0.3 U < 0.3 U < 0.5 U < 0.3 U Selenium, Dissolved (mg/L 0.02 Statistical Limit < 0.003 U < 0.003 U NA NA NA NA Thallium, Dissolved (mg/L 0.01 Statistical Limit < 0.005 U < 0.005 U NA NA NA NA Uranium, Dissolved (mg/L 0.03 Statistical Limit NA NA NA NA NA NA Zinc, Dissolved (mg/L 2.0 Statistical Limit < 0.3 U < 0.5 U NA NA NA NA Other Chloride (mg/L 8,895 Statistical Limit 7,080 6,450 5,600 6,260 6,650 6,410 Fluoride (mg/L 2.0 Statistical Limit 1.1 1.13 NA NA NA NA Nitrate as N (mg/L 10 Statistical Limit NA NA NA NA NA NA Nitrite as N (mg/L 1.0 Statistical Limit NA NA NA NA NA NA Nitrate+Nitrite as N (mg/L 10 Statistical Limit NA NA NA NA NA NA Lab pH (s.u) 6.5-8.5 Statistical Limit 8 H 7.9 H 8.1 H 8.2 H 8 H 8.1 H Total Dissolved Solids, filterable residue (mg/L 10,212 Regulatory Limit 10,800 H 10,300 H 9,530 1 10,900 1 10,600 10,900 Sulfate (mg/L 1,322 Statistical Limit < 500 U < 500 U < 500 U < 500 U < 500 U < 500 U Gross Alpha Ci/L 15 Regulatory Limit NA NA NA NA NA NA Gross Beta Ci/L none NA NA NA NA NA NA Supplementary Analytes Not Historical) analyze Bicarbonate as CaCO3 (mg/L none 606 623 616 611 NA 604 Carbonate as CaCO3 (mg/L none < 20 U < 20 U < 20 U < 20 U NA < 20 U Calcium, Dissolved (mg/L none 36.1 38 37 37 38 38 Magnesium, Dissolved (mg/L none 16 17 18 18 21 17 Potassium, Dissolved (mg/L none 9 9 B 9 B 10.0 12.0 B 9.0 Sodium, Dissolved (mg/L none 4,120 4,360 4,050 3,950 4,070 4,040 Notes: B = Estimated value, less than the practical quantitation limit for that analyte, but greater than the method detection limit U = Analyte not detected, reported less than the practical quantitation limit H = Analysis exceeded method hold time. pH is a field test with an immediate hold time. NA = Analyte not analyzed Reanalysis performed for analyte, reanalysis result reported. Values in Bold exceeded benchmark levels Determination of benchmark levels presented in Golder 2011, Results of the September 2010 Groundwater Monitoring Event near the Cement Kiln Dust Disposal Area A2 at the Boettcher Limestone Quarry, La Porte Colorado (January 6) I.\15\1520788\0110\8oettcherGWSamp2Q 2015_Dft-08Jull5\Tables\Tables 1-7 DataRequest_Tables 1-7.rdsWW-0 Page 2 of 2 1520788 GGolder Associates