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December 2015 Table 4: Summary of Monitoring Results for MW -4 1520788 Date Benl..chm ark evel Benchmark Bass 9/27/2010 3/31/2011 6/28/2011 8/31/2011 11/172011 3/27/2012 8/27/2012 9/13/2012 11/13/2012 3/19/2013 5/28/2013 8/26/2013 11/15/2013 2/18/2014 6/21/2014 8/27/2014 11/11/2014 2/18/2015 5/27/2015 8/27/2015 11/9/2016 Metals Arsenic. Dissolved (mo/L) 0.17 Statistical Limit 0.068 004 0.055 0.076 <0.02 U < 0.02 U 0.0009 B < 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 Banum, Dissolved (mg/L) 2 0 Regulatory Lima 8.69 8.84 7.83 • 8.93 7.94 8.73 8.41 8.91 8.67 9.22 8.74 9.13 8.8 8.58 9.84 8.01 8.56 8.77 8.76 8.81 8.8 Boron, Dissolved (mo/L) 0.75 Statistical Limit 0.7 0 5 B 0 62 • 0.7 0.7 0 7 0.8 B 0.5 0 72 0.7 0.7 0.6 0.7 0.63 0.6 0.7 0.7 0.8 B 0.6 0.7 0.6 Chromium, Dissolved (mg/L) 0.3 Statistical Limit < 002 U < 0 02 U < 0 02 U < 0.02 U < 0 02 U < 0.02 U 0 0014 B < 0.02 U < 0.02 U < 0.02 U < 0.02 U < 0.02 U < 0.02 U < 0.02 U < 0.02 U NA NA NA NA NA NA Copper, Dissolved (ma/L) 0 3 Statistical Limit < 0 5 U < 0.5 U < 0.5 U < 0.5 U < 0.5 U < 0 5 U < 1 11 < 0.5 U < 0.5 U < 0 5 U < 0.5 U < 0.5 U < 0.5 U < 0.3 U < 0.5 U NA NA NA NA NA NA Iron. Dissolved (mf /L) 0.61 Statistical Limit 0 3 B 0.3 B 0 28 • 0.8 < 0.5 U 0.6 1.0 < 0.5 U 0.32 U 0.8 0 5 U 0 4 B 0 3 B 0.8 0 2 B 0.5 0.3 B < 1 U 0.3 B 01 B 0.4 B Lead, Dissolved (mo/L) 0 05 Regulatory Limit < 0 005 U < 0 005 U 0.002 B 0.001 B < 0.005 U < 0.005 U < 0.01 U < 0 005 U < 0.005 U < 0.005 U < 0.005 U < 0.005 U < 0 005 U < 0.005 U < 0.005 U NA NA NA NA NA NA Lithium, Dissolved (ma/L) 2 5 Statistical Limit 2 1.9 2.25 • 1.8 1 6 1.8 1 9 B 1 9 2.38 NA NA NA NA NA NA NA NA NA NA NA NA Manaanese,Dissolved (m0/L) 12 Statistical Limit <0.3LI <0.3U <0.3U <0.3LI <03U <03U <05U <03U 00188 <0.3U <0,3U <03U <0.3LI <0.1U <03U <0.3U <0.3U <0.5U <0.3U <0.1U <0.3U Selenium, Dissolved (ma/L) 002 Statistical Limit < 0.003 U 0 012 < 0 003 U < 0.003 U <0 003 U 0.007 0.0029 < 0.003 U 0 002 B 0.003 B 0 006 < 0.003 U <0.003 U < 0003 U <0.003 U NA NA NA NA NA NA Thallium, Dissolved (mo/L) 0 01 Statistical Limit < 0 005 U 0 001 B < 0 005 U < 0.005 U < 0.005 U < 0 005 U < 0.01 U < 0.005 U < 0 005 U < 0.005 U < 0.005 U < 0.005 U < 0.005 U < 0.005 U < 0.005 U NA NA NA NA NA NA Uranium. DlssoNed (ma/L) 0.03 Statistical Limit < 0.005 U 0 001 B < 0 005 11 0.002 B < 0.005 U < 0 005 U < 0.01 U < 0.005 U < 0.005 U NA NA NA NA NA NA NA NA NA NA NA NA Zinc, Dissolved (ma/L) _ 2.0 Statistical Ltrnit < 0 5 U < 0.5 U < 0 5 U < 0.5 U < 0.5 U < 0.5 U < 1.0 U < 0.5 U < 0.5 U < 0.5 U < 0.5 U < 0.5 U < 0 5 U < 0.3 U < 0.5 U NA NA NA NA NA NA Other Chlonde (ma/L) 8.895 Statistical Limit 6.300 6,200 6.200 6.500 6.282 6.063 6.105 6.566 6.077 6.744 6.490 6.470 6.750 7.080 6.450 5.600 6 260 6.650 6.410 6.630 6.880 Fluonde (mq/L) 2.0 Statistical Limit 1.1 1 1 1 1.1 1.1 1.0 1.1 1.2 1.1 1.1 1.1 1.1 1.1 1.1 1.13 NA NA NA NA NA NA Nitrate as N (ma/L) 10 Statistical Limit < 0 1 IJ < 0.1 U < 0.1 11 < 0.1 U < 0.1 U 183 004 B 0.04 8 0.04 B NA NA NA NA NA NA NA NA NA NA NA NA Nitrite as N (mg/L) 1 0 Statistical Lmit < 0 05 U 0.01 B < 0 05 U < 0.05 U < 0.05 U < 0 05 U < 0 05 U < 0 05 U < 0.05 U NA NA NA NA NA NA NA NA NA NA NA NA Nitrate+Nitrite as N (ma/L) 10 Statistical Limit < 0.1 U 0.02 B < 01 U < 01 U < 0.1 U 1 83 0.04 B 0.04 B 0.04 B NA NA NA NA NA NA NA NA NA NA NA NA Lab pH (s.u) 6 5-8.5 Statistical Limit 8.3 11 8.2 H 8.2 8.2 H 8.3 U 8.1 H 81 H 8.1 H 8.2 H 8.1 H 8.2 H 81 H 8.1 H 8 H 7.9 11 8.1 H 8.2 11 8 H 8.1 H 8.2 11 8.2 11 Total Dissolved Solids filterable residue (ma/L) 10,212 Regulatory Limit 11,000 11.100 11,100 10,900 11.100 11,200 10,800 11,100 10.800 11,100 11.000 10.900 10.300 H 10.800 H 10.300 H 9.530 10.900 10.600 10.600 " 9.720 " 10.800 Sulfate (mg/L) 1,322 Statistical Limit < 500 U < 500 U < 500 U < 300 U < 500 U < 500 U < 500 U < 500 U < 500 U < 500 U < 500 U < 500 U < 500 U < 500 U < 500 U < 500 U < 500 U < 500 U < 500 U < 500 U <500 U Gross Alpha (pCi/L) 15 Regulatotv Limit -10 (t39) 71(547) 16 (337) 40 (362) 19 (5522) -33 (218) 260 (376) -0.11 (*17) -15 (330) NA_ NA NA NA NA NA NA NA NA NA NA NA Gross Beta (DCJLL none -7.5 (353) 80 (249) 22 (246) 611±57) 08 (503) 38 (261) 270 (262) 53 (253) 9 9 (342) NA NA NA NA NA NA NA NA NA NA NA NA [rW[NIROrf0�11 atlalyaaaj Bicarbonate as CaCO3(mo/L) none 585 565 569 562 573 597 580 576 571 573 567 590 576 606 623 616 611 NA 604 599 615 Carbonate as CaCO3 (ma/L) none 16 B < 20 U < 20 U < 20 U < 20 U < 20 U < 20 U < 20 U < 20 U < 20 U < 20 U < 20 U < 20 U < 20 U < 20 U < 20 U < 20 U NA < 20 U < 20 U < 20 U Calcium. Dissolved (mo/L) none 37 38 79 37 35 36 42 38 39.2 37 37 37 36 36.1 38 37 37 38 38 36.9 38 Magnesium, Dissolved (ma/L) none 18 18 38 16 16 17 22 19 18 9 18 18 17 16 16 17 18 18 21 17 18 17 Potassium, Dissolved (mo/L) none 10 B 12 B 20 B 7.0 B 9 0 8 7.0 B 15 B 10 B 22 10 B 10 B 9.0 B 9 B 9 9 B 9 B 10 0 12.0 B 9 0 9.0 10.0 Sodium, Dissolved (moil) Notes none _ 4,270 4,180 4,280 4,200 3,930 4,220 4,240 4,250 4,150 4.390 4,260 4,350 4,070 4,120 4,360 4,050 3,950 4,070 4,040 4,030 4,050 B = Estimated value, less than the practical quantaatlon 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 ^ = Second and third quarter 2015 reports presented calculated total dissolved solids results • 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) 1A152078010110BmYCerOWsv,p402015DL100ec1ATetlu1Tlle•1-7 D.Reyesl_Tmllea 1-79** .4 I►bSOClYtt3