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March 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
<br /> Level
<br /> Metals
<br /> Arsenic, Dissolved(mg/L) 0.17 Statistical Limit <0.01 U NA NA NA NA NA NA NA
<br /> Barium,Dissolved(mg/L) 2.0 Regulatory Limit 9.64 8.01 8.56 8.77 8.76 8.81 8.80 8.66
<br /> Boron,Dissolved(mg/L) 0.75 Statistical Limit 0.6 _ 0.7 0.7 0.8 B 0.6 0.7 0.6 0.7
<br /> Chromium,Dissolved(mg/L) 0.3 Statistical Limit <0.02 U NA NA NA NA NA NA NA
<br /> Copper, Dissolved(mg/L) 0.3 Statistical Limit <0.5 U NA NA NA NA NA NA NA
<br /> Iron, Dissolved(mg/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
<br /> Lead,Dissolved(mg/L) 0.05 Regulatory Limit <0.005 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) 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
<br /> Selenium,Dissolved(mg/L) 0.02 Statistical Limit <0.003 U NA NA NA NA NA NA NA
<br /> Thallium, Dissolved(mg/L) 0.01 Statistical Limit <0.005 U NA NA NA NA NA NA NA
<br /> 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 <0.5 U NA NA NA NA NA NA NA
<br /> Other
<br /> Chloride (mg/L) 8,895 Statistical Limit 6,450 5,600 6,260 6,650 6,410 6,630 6,880 6,530
<br /> Fluoride(mg/L) _ 2.0 Statistical Limit 1.13 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) 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
<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
<br /> Sulfate(mg/L) 1,322 Statistical Limit <500 U <500 U <500 U <500 U <500 U <500 U <500 U <500 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 623 616 611 NA 604 599 615 606
<br /> Carbonate as CaCO3(mg/L) none <20 U <20 U <20 U NA <20 U <20 U <20 U <20 U
<br /> Calcium,Dissolved(mg/L) none 38 37 37 38 38 36.9 38 38
<br /> Magnesium,Dissolved(mg/L) none 17 18 18 21 17 18 17 17
<br /> Potassium,Dissolved(mg/L) none 9 B 9 B . 10.0 12.0 B 9.0 9.0 10.0 11.0
<br /> Sodium,Dissolved(mg/L) none 4,360 4,050 3,950 4,070 4,040 4,030 4,050 4,290
<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 /> .. •
<br /> CA Golder
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