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March 2016 1547675
<br /> Table 2: Summary of Monitoring Results for MW-2
<br /> Date Benchmark Level 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
<br /> Metals
<br /> Arsenic, Dissolved(mg/L) 0.15 Statistical Limit 0.006 NA NA NA NA NA NA NA
<br /> Barium, Dissolved(mg/L) 2.0 Regulatory Limit 2.28 2.57 1.71 2.03 2.65 2.04 1.90 2.0
<br /> Boron, Dissolved(mg/L) 0.75 Statistical Limit 0.75 0.75 0.74 0.73 0.72 0.75 0.68 0.79
<br /> Chromium,Dissolved(mg/L) 0.3 Statistical Limit <0.01 U NA NA NA NA NA NA NA
<br /> I Copper,Dissolved(mg/L) 0.3 Statistical Limit <0.05 U NA NA NA NA NA NA NA
<br /> Iron,Dissolved(mg/L) 0.71 Statistical Limit 2.5 1.16 0.82 0.38 0.6 0.7 0.4 0.4 B
<br /> Lead, Dissolved(mg/L) 0.05 Regulatory Limit <0.003 U NA NA NA NA NA NA NA
<br /> Lithium,Dissolved(mg/L) 2.5 Statistical Limit NA NA NA _ NA_ NA NA NA NA
<br /> Manganese,Dissolved(mg/L) 0.49 Statistical Limit 0.097 0.105 0.103 0.075 0.05 B 0.07 B 0.08 B 0.08 B
<br /> Selenium,Dissolved(mg/L) 0.02 Statistical Limit 0.0007 B NA NA NA NA NA NA NA
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<br /> Thallium,Dissolved(mg/L) 0.01 Statistical Limit <0.003 U NA NA NA NA NA NA NA
<br /> i Uranium, Dissolved(mg/L) 0.03 Statistical Limit NA NA NA NA NA NA NA NA
<br /> Zinc,Dissolved(mg/L) 2.0 Statistical Limit <0.05 U NA NA NA NA NA NA NA
<br /> Other
<br /> Chloride (mg/L) 3,640 Statistical Limit 3,240 2,930 2,980 2,990 3,150 3,100 3,040 3,240
<br /> Fluoride(mg/L) 2.1 Statistical Limit 1.48 NA NA NA NA NA NA NA
<br /> Nitrate as N(mg/L) 10 Statistical Limit NA NA NA NA NA NA NA NA
<br /> Nitrite as N(mg/L) 1.0 Statistical Limit NA NA NA NA NA NA NA NA
<br /> Nitrate+Nitrite as N(mg/L) 10 _ Statistical Limit NA NA NA NA NA NA NA NA
<br /> Lab pH(s.u) 7.4-8.8 Statistical Limit 8.0 H 8.0 H 8.3 H 8.0 H 8.0 H 8.3 H 8.2 H 8.3
<br /> Total Dissolved Solids,filterable residue(mg/L) 6,971 Regulatory Limit 6,040 H 5,730 6,180 6,230 6,000 A 5,520 A 6,020 6,230
<br /> Sulfate(mg/L) 250 Regulatory Limit <250 U <250 U <250 U <250 U <250 U <250 U <250 U <250 U
<br /> Gross Alpha(pCi/L) 15 Regulatory Limit NA NA NA NA NA NA NA NA
<br /> Gross Beta(pCi/L) none NA NA NA NA NA NA NA NA
<br /> Supplementary Analytes(Not Historically analyzed)
<br /> Bicarbonate as CaCO3(mg/L) none 1,100 1,080 1,100 NA 1,070 1,040 1,050 1,040
<br /> Carbonate as CaCO3(m9/L) none <20 U <20 U <20 U NA <20 U <20 U <20 U <20 U
<br /> Calcium,Dissolved(mg/L) none 18.2 17.9 17.4 17.5 17.3 17.3 17.2 18
<br /> Magnesium,Dissolved(mg/L) none 6.9 6.6 7.4 7.4 7.0 8.0 7.0 8.0 B
<br /> Potassium,Dissolved(mg/L) none 6.5 6.1 6 6.4 7.0 7.0 6.0 8.0
<br /> Sodium, Dissolved(mg/L) none 2,440 2,330 2,260 2,390 2,270 2,370 2,260 2,560 •
<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 /> Values in Bold exceeded benchmark levels
<br /> 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)
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