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' July 2016 1547675 <br />' Table 4: Summary of Monitoring Results for MW-4 <br /> Date Benchmark Benchmark Basis 5/21/2014 8/27/2014 11/11/2014 2/18/2015 5/27/2015 8/27/2015 11/9/2015 2/15/2016 5/31/2016 <br />' Level <br /> Metals <br /> Arsenic,Dissolved m /L 0.17 Statistical Limit <0.01 U NA NA NA NA NA NA NA NA <br /> Barium,Dissolved m /L 2.0 Regulatory Limit 9.64 8.01 8.56 8.77 8.76 8.81 8.80 8.66 8.79 <br /> Boron,Dissolved m /L 0.75 Statistical Limit 0.6 0.7 0.7 0.8 B 0.6 0.7 0.6 0.7 0.6 <br /> Chromium, Dissolved m /L 0.3 Statistical Limit <0.02 U NA NA NA NA NA NA NA NA <br /> Copper,Dissolved m /L 0.3 Statistical Limit <0.5 U NA NA NA NA NA NA NA NA <br />' Iron,Dissolved m /L 0.61 Statistical Limit 0.2 B 0.5 0.3 B <1 U 0.3 B 0.1 B 0.4 B 0.2 B 0.14 <br /> Lead,Dissolved m /L 0.05 Regulatory Limit <0.005 U NA NA NA NA NA NA NA NA <br /> Lithium,Dissolved m /L 2.5 Statistical Limit NA NA NA NA NA NA NA NA NA <br /> Manganese,Dissolved m /L 1.2 Statistical Limit <0.3 U <0.3 U <0.3 U <0.5 U <0.3 U <0.1 U <0.3 U <0.3 U <0.03 U <br /> Selenium,Dissolved m /L 0.02 Statistical Limit <0.003 U NA NA NA NA NA NA NA NA <br />' Thallium,Dissolved m /L 0.01 Statistical Limit <0.005 U NA NA NA NA NA NA NA NA <br /> Uranium,Dissolved m /L 0.03 Statistical Limit NA NA NA I NA NA NA NA NA NA <br /> Zinc,Dissolved m /L 2.0 Statistical Limit <0.5 U NA NA NA NA NA NA NA NA <br /> Other <br />' Chloride m /L 8,895 Statistical Limit 6,450 5,600 6,260 6,650 6,410 6,630 6,880 6,530 6,290 <br /> Fluoride m /L 2.0 Statistical Limit 1.13 NA NA NA NA NA NA NA NA <br /> Nitrate as N m /L 10 Statistical Limit NA NA NA NA NA NA NA NA NA <br /> Nitrite as N m /L 1.0 Statistical Limit NA NA NA NA NA NA NA NA NA <br /> ' Nitrate+Nitrite as N m /L 10 Statistical Limit NA NA NA NA NA NA NA NA NA <br /> Lab pH s.0 6.5-8.5 Statistical Limit 7.9 H 8.1 H 8.2 H 8 H 8.1 H 8.2 H 8.2 H 8.2 7.9 H <br /> Total Dissolved Solids,filterable residue(mg/L 10,212 Regulatory Limit 10,300 H 9,530 10,900 10 600 10,600 " 9,720 A 10,800 10,900 10,100 <br /> Sulfate m /L 1,322 Statistical Limit <500 U <500 U <500 U <500 U <500 U <500 U <500 U <500 U <250 U <br /> Gross Alpha Ci/L 15 Regulatory Limit NA NA NA NA NA NA NA NA NA <br /> Gross Beta Ci/L none NA NA NA NA NA NA NA NA NA <br /> Supplementary Ana tes Not Historical) anal zed <br /> Bicarbonate as CaCO3 m /L none 623 616 611 NA 604 599 615 606 664 <br /> Carbonate as CaCO3 m /L none <20 U <20 U <20 U NA <20 U <20 U <20 U <20 U <20 U <br /> ' Calcium, Dissolved m /L none 38 37 37 38 38 36.9 38 38 36 <br /> Magnesium,Dissolved m /L none 17 18 18 21 17 18 17 17 16.4 <br /> Potassium,Dissolved m /L none 9 B 9 B 10.0 12.0 B 9.0 9.0 10.0 11.0 9.1 <br /> Sodium,Dissolved m /L none 4,360 4,050 3,950 4,070 4,040 4,030 4,050 4,290 4,020 <br /> ' Notes: <br /> B=Estimated value,less than the practical quantitation limit for that analyte,but greater than the method detection limit <br /> U=Analyte not detected,reported less than the practical quantitation limit <br /> H=Analysis exceeded method hold time.pH is a field test with an immediate hold time. <br /> NA=Analyte not analyzed <br /> ' A=Second and third quarter 2015 reports presented calculated total dissolved solids results <br /> *Reanalysis performed for analyte,reanalysis result reported. <br /> Values in Bold exceeded benchmark levels <br /> Determination of benchmark levels presented in Golder 2011, Results of the September 2010 Groundwater Monitoring Event <br /> ' near the Cement Kiln Dust Disposal Area A2 at the Boettcher Limestone Quarry, La Porte Colorado (January 6) <br /> Golder <br /> I'\15\1547675\0110\2ndL)2016 GWSampling-Boettcher_Dft-OtJul16\Tables\new Tables 1-7 DataRequest_Tables 1-7.rIsxMW-0 Page 2 of 2 Associates <br />