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December 2015 1520788 Table 2: Summary of Monitoring Results for MW -2 DateBenchmark Level Benchmark Basis 9/27/2010 3131/2011 6/2812011 8/31/2011 11117/2011 3/27/2012 6/27/2012 9/13/2012 11113/2012 3/19/2013 5/28/2013 8126/2013 11114/2013 2/18/2014 6/21/2014 8/2712014 11/11/2014 218/2015 5127/2015 8127/2015 11/9/2015 Metal: Arsenic, Dissolved (mail) 0 15 Statistical Limit 0.036 0 021 0.03 0.036 < 0.01 U < 0 01 U < 0 01 U < 0.005 U 0.001 B 0.002 B 0.001 B 0.002 B 0.001 B 0 004 B 0.006 NA NA NA NA NA NA Banum, Dissolved (mg/L) 2.0 Regulatory Limit 2.09 1.33 1.09 096 1.09 1 42 155 1.72 1 26 1.3 1.07 1.23 122 1.74 2.28 2.57 1.71 2.03 2.86 2.04 190 Boron, Dissolved (mg/L) 0.75 Statistical Limit 0.7 0.64 0.69 0.78 0.64 0 73 0 72 0.70 0.79 0.71 0.78 0.70 0.74 0.70 0.75 0 75 0.74 0.73 0 72 0 75 068 Chromium, Dissolved (ma/L) 0.3 Statistical Limd < 0 01 U < 0.01 U < 0 01 U < 0.01 U < 0.01 U < 0 01 U < 0 01 U < 0.01 U < 0 01 U < 0.01 U < 0.01 U < 0.01 U < 0.01 U < 0.01 U < 0.01 U NA NA NA NA_ NA NA Copper, Dissolved (mall) 0 3 Statistical Limit < 0.3 U < 0.3 U < 005 U < 0.3 U < 0.3 U < 0.05 U < 0.3 U < 0.3 U < 0.3 U < 005 U < 0.3 U < 0.3 U < 0 05 U < 0.05 U < 0.05 U NA NA NA NA NA NA Iron, Dissolved (mg/L) 0.71 Statistical Limit < 0.3 U 0.1 B 0.15 < 0 3 U 0.3 B 0.91 0.8 0.7 016 1.1 0.2 B 0.9 1.32 1.51 2.5 1.16 0.82 0.38 0.6 0.7 0.4 Lead, Dissolved (ma/L) 0.05 Regulatory Limit < 0.003 U < 0.003 U 0 0011 B 0.0006 B < 0.003 U < 0.003 U < 0.003 U < 0.003 U < 0.003 U < 0.003 U < 0.003 U < 0.003 U < 0.003 U < 0.003 U < 0.003 U NA NA NA NA NA NA Lithium. Dissolved (ma/L1 2.5 Statistical Limit 1.3 1.2 1.12 1 1 1 1 1 16 1.2 1.2 1 36 NA NA NA NA NA NA NA NA NA NA NA NA Manganese, Dissolved (m0/L) 0 49 Statistical Limit 0.08 B 0.12 0139 01 0.12 0102 006 B 0 06 B 0 114 0.121 0.09 0.11 0.127 0.099 0 097 0.105 0.103 0.075 005 B 0,07 B 0.08 B Selenium, Dissolved (ma/L) 0 02 Statistical Limit 0.0006 B 0.0015 0.0006 B < 0 001 U < 0.001 U < 0.001 U < 0.001 U 0 0008 B 0 0007 B 0.0011 0.0032 < 0.001 U 0.0006 8 < 0.001 U 0.0007 B NA NA NA NA NA NA Thallium, Dissolved (mg/L) 0.01 Statistical Limit < 0.003 U 0.0007 B < 0 003 U < 0 003 U < 0.003 U < 0.003 U < 0.003 U < 0.003 U < 0 003 U < 0.003 U < 0.003 U < 0.003 U < 0.003 U < 0.003 U < 0.003 U NA NA NA NA NA NA Uranium, Dissolved (ma/L) 003 Statistical Limit 0.0048 0.0033 0.0025 B < 0 003 U 0.0011 B 0.0009 8 0.0012 B 0 0012 B 0.0012 B NA NA NA NA NA NA NA NA NA NA NA NA Zinc, Dissolved (mg/L) 2 0 Statistical Limit < 0.3 U < 03 U < 0.05 U < 0.3 U < 0.3 U < 0.05 U < 0.3 U < 0 3 U < 0.3 U < 005 U < 0 3 U < 0.3 U < 005 U < 0.05 U < 0.05 U NA NA NA NA NA NA Other Chloride (ma/L) 3.640 Statistical Limit 3.050 3.100 3.090 3.240 3,017 3.052 3.079 3.188 2,968 3.227 3.220 2.960 3.080 3.180 3.240 2.930 2.980 2.990 3.150 3.100 3.040 Fluoride (mg/L) 2.1 Statistical Limit 1 7 1.5 1 5 1 4 1 6 1.5 1 6 1.5 1 7 1 7 1.6 1 6 1.5 1.5 1 48 NA NA NA NA NA NA Nitrate as N (mg/L) 10 Statistical Limit 0.14 0 07 B 006 B 0 03 B < 0.1 U 0.04 B 004 B 0 03 B 0.04 B NA NA NA NA NA NA NA NA NA NA NA NA Nitrite as N (ma/L) 1.0 Statistical Limit < 005 U < 0 05 U < 005 U < 0.05 U < 0 05 LI < 0 05 U < 0 05 U <0.05 U < 005 U NA NA NA NA NA NA NA NA NA NA NA NA Nitrate+Nibite as N (mg/L) 10 Statistical Limit 0.14 0 07 B 0.06 B 0 03 8 < 0.1 U 0.04 B 0.04 B 0 03 B 0.04 B NA NA NA NA NA NA NA NA NA NA NA NA Lab p11(s u) 7.4-8 8 Statistical Limit 8.6 11 8.2 H 8 4 H 8.3 11 8.2 H 8 3 H 8 3 11 8.6 11 8.3 11 8.3 11 8.3 H 8.2 11 8.1 11 6.0 11 8.0 11 8.0 11 8 3 11 8.0 11 8.0 11 8.3 H 8 2 H Total Dissolved Solids. filterable residue (m0/L1 6.971 Regulatory Limit 6.270 6.390 6.350 6.320 6.140 6,340 6.120 6.270 6,180 6.300 6.400 6 210 H 6.150 H 5.720 6.040 H 5.730 6.180 6.230 6.000 " 5.520 ^ 6.020 Sulfate (mg/L) 250 Regulatory Limit < 300 U 60 B 90 B < 100 U < 250 U < 250 U < 250 U < 250 U < 250 U < 250 U < 250 U < 250 U < 250 U < 250 U < 250 U < 250 U < 250 U < 250 U < 250 U < 250 U < 250 U Gross Alpha (pCl/L) 15 Regulatory Limit 161228) 9.8 (425) 16 (224) 014261 3613311 -1.1 (421) 5.1 (±12) -6.2 (�1�13) -12 (4211 NA NA NA NA NA NA NA NA NA NA NA NA Grose Beta (pCUL) none 4.5 (430) 42 (±31) _ 12 (429) 0 (427) 73 (4441 8.5 (429) 82 (4301 21 (t26) 11 (428) NA NA NA +A NA NA NA NA NA NA NA NA Susolementary Ana(ytaa [Not Historically 00400340411 Bicarbonate as CaCO3 (ma/i) none 993 965 978 953 914 995 968 964 978 955 963 979 1.020 1.060 1.100 1.080 1 100 NA 1.070 1.040 1.050 Carbonate as CaCO3 (mg/L) none 108 < 20 U 37 22 57 < 20 U 21 < 20 U 23 29 22 < 20 U < 20 U < 20 U < 20 U < 20 U < 20 U NA < 20 U < 20 U < 20 U Calcium, Dissolved (ma/L) none 14 14 14 4 16 15 15 5 14 16 16.3 15.1 18 17 16 9 17.6 18.2 17.9 17.4 17.5 17.3 17 3 17.2 Magnesium, Dissolved (mg/L) none 8 8 7.8 7 7 7 4 8 8 8 7 5 8 7 7.4 7.3 6.9 6.6 7.4 7.4 7.0 8.0 7.0 Potassium, Dissolved (mg/L) none 7 6 8 B 7.4 4 B 6 B 6 6 7 B 7 B 10.8 B 7 0 7 6 8 6 1 6.2 6.5 61 6 6.4 7.0 7 0 6 0 Sodium, Dissolved (mg/L) none 2,480 2,430 2,470 2,410 2,260 2,410 2,420 2,420 2,310 2,550 2,500 2,540 2,490 2,440 2,440 2,330 2,260 2,390 2,270 2,370 2,260 B = Estimated value, less than the practical quantitation limit for that analyte, but greater than the method detection limt 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 = Second and third quarter 2015 reports presented calculated total dissolved solids results 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) 1511.520780,01108ld GWS.a. 402015_011-18]ec15TeblWTSEb1-70eYReputl Tablas 1-7boMW-2 CittAsartes