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December 2016 1547675 Table 3: Summary of Monitoring Results for MW-3 Date Benchmark Benchmark Basis 9/27/2010 3/31/2011 6/30/2011 8/31/2011 11/17/2011 3/27/2012 6/27/2012 9/13/2012 11/13/2012 3/19/2013 5/28/2013 8/26/2013 11/14/2013 2/18/2014 Level Metals Arsenic,Dissolved m /L 0 062 Statistical Limit 0 019 001 0 011 002 <0 004 U <0 01 U 00011 B <0 005 U 0 0005 B 00008 B <0 005 U 0 001 B <0 002 U 00009 B Barium,Dissolved(mg/L) 20 Regulatory Limit 2.4 2.95 2.23 2.73 2.25 2.51 2.08 2.52 2.23 2.5 2.20 2.41 2.25 2.31 Boron,Dissolved(mg/L) 075 Statistical Limit 0.77 0.75 0.74 0.8 0.78 0.77 0.76 0.76 0.85 0.79 0.84 075 0.76 074 Chromium, Dissolved m /L 01 Regulatory Fegulatory Limit 0 003 B 0 001 B <0 01 U 0 004 B <0.004 U <0 01 U <0 002 U <0 01 U <0 01 U <0 004 U <0.01 U <0.01 U <0 004 U <0 004 U Copper,Dissolved m /L 02 Statistical Limit <0 1 U <0 1 U <0 3 U <0 1 U <0 1 U <0 05 U <0 05 U <0 3 U <0 3 U <0 05 U <0 3 U <0.3 U <0 05 U <0 05 U Iron,Dissolved m /L 03 Regulatory Limit 004 B 027 <0 3 U <0 1 U 0 1 022 0.32 <0.3 U 0.1 Oil <0 3 U <0 3 U 014 019 Lead,Dissolved m /L 005 Regulatory Limit <0 001 U 00007 B 00002 'B 00004 B <0 001 U <0.003 U 00007 <0 003 U 00003 B <0 001 U <0.003 U <0 003 U <0 001 U <0 001 U Lithium,Dissolved m /L 25 Statistical Limit 0.8 074 08 071 064 072 0.7 07 0.83 NA NA NA NA NA Manganese, Dissolved m /L 008 Statistical Limit 004 B 005 003 B 004 B 003 B 0 021 B 0 034 <0.1 U 0 047 0 026 <0 1 <0 1 U 0 031 0 043 Selenium,Dissolved m /L 002 Statistical Limit 00006 00012 <0 001 U 0.0005 <0 005 U 0.0065 00007 <0 001 U 00005 B 00006 0.0043 <0 001 U 00003 B <0 0005 U Thallium,Dissolved m /L 001 Statistical Limit <0.001 U <0 001 U <0 003 U <0.001 U <0 001 U <0 003 U <0 0005 U <0 003 U <0 003 U <0 001 U <0 003 U <0 003 U <0 001 U <0 001 U Uranium,Dissolved m /L 003 Statistical Limit 00015 0 0008 B 0 001 B 00006 B 00012 00006 B 00011 00005 B 00005 B NA NA NA NA NA Zinc,Dissolved(mg/L) 2.0 Statistical Limit <0 1 U <0 1 U <0 3 U <0 1 U <0 1 U <0 05 U <0 05 U <0.3 U <0 3 U <0 05 U <0 3 U <0 3 U <0 05 U 002 B Other Chloride m /L 1,620 Statistical Limit 1,550 1,530 1,550 1,620 1,530 1,565 1,505 1,681 1,721 1,665 1,620 1,570 1,610 1,570 Fluoride(mg/L) 36 Statistical Limit 24 23 2.2 24 24 23 25 23 24 23 24 2.4 2.3 24 Nitrate as N m /L 10 Statistical Limit <0 1 U 037 0.79 003 B <0.1 U <0 1 U 002 B 0 17 009 B NA NA NA NA NA Nitrite as N m /L 1 0 Statistical Limit <0 05 U <0 05 U <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 Nitrate+Nitrite as N(mg/L) 10 Statistical Limit <0.1 U 0.37 0.79 003 B <0 1 U <0 1 U 002 B 017 009 B NA NA NA NA NA Lab pH s u 7 6-9 3 Statistical Limit 86 H 84 H 8.6 H 8.5 H 82 H 84 H 84 H 85 H 85 H 85 H 84 H 85 H 84 H 84 H Total Dissolved Solids,filterable residue m /L 4,546 Regulatory Limit 3,930 3,940 4,000 3,940 3,860 4,000 3,790 4,000 3,950 3,990 4,000 4,000 3,880 H 31890 Sulfate(mg/L) 250 Regulatory Limit <100 U <100 U <300 U <50 U <125 U <125 U 30 1 B <125 U <125 U <125 U <125 U <125 U <125 U <125 U Gross Alpha Ci/L 15 Regulatory Limit 5 7 ±13 33 ±20 5 7 ±17 15 ±18 20 ±18 8 ±13 66 ±27 0 85 ±14 -8 2 ±8.6 NA NA NA NA NA Gross Beta Ci/L none 32 t±l7 25 1.21 7 2 ±18 5 ±19 5 4 ±18 13 ±18 110 ±24 15 ±17 -4 9 ±18 NA NA NA NA NA Supplementary Anal tes Not Historically anal zed Bicarbonate as CaCO3 m /L none 1,110 1,130 1,100 1,090 1,100 1,160 1,130 1,130 1,130 1,140 1,130 1,130 1,170 1,220 Carbonate as CaCO3 m /L none 98 31 96 75 78 50 52 51 78 71 60 75 40 37 Calcium, Dissolved m /L none 66 11 9 7 75 68 63 94 7 75 6.1 7 8 68 67 Magnesium, Dissolved m /L none 3 34 3 B 27 28 29 29 4 B 36 30 3 3 B 28 3 Potassium, Dissolved m /L none 4.4 55 50 B 32 36 42 41 40 6 69 44 40 4.0 B 39 4 0 Sodium,Dissolved m /L none 1,600 1,450 1,560 1,490 1,370 1,550 1,530 1,580 1,550 1,620 1,590 1,600 1,600 1,570 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 ^=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) GAssociates \151507675\0110k1Ih02016GWSampling-BoettcherDft-09Dec16�TableslTables1-7x15xMW-3 Page 1 Of 2 Golder