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September 2016 1547675
<br /> 1 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 8/16/2016
<br /> Level
<br /> Metals
<br /> Arsenic,Dissolved m /L 0.17 Statistical Limit <0.01 U NA NA NA NA NA NA NA NA NA
<br /> 1 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 8.91
<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 0.6
<br /> Chromium, Dissolved m /L 0.3 Statistical Limit <0.02 U NA 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 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 <0.5 U
<br /> Lead,Dissolved m /L 0.05 Requlatory Limit <0.005 U NA 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 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 <0.3 U
<br /> Selenium,Dissolved m /L 0.02 Statistical Limit <0.003 U NA 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 NA
<br /> Uranium,Dissolved m /L 0.03 Statistical Limit NA NA NA NA NA NA NA NA NA NA
<br /> Zinc, Dissolved m /L 2.0 1 Statistical Limit I <0.5 U NA 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 6,350
<br /> Fluoride m /L 2.0 Statistical Limit 1.13 NA NA NA I NA NA NA NA NA NA
<br /> Nitrate as N m /L 10 Statistical Limit NA 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 NA
<br /> Nitrate+Nitrite as N m /L 10 Statistical Limit NA 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 8.3 H
<br /> Total Dissolved Solids,filterable residue(mq/L 10,212 Requlatory Limit 10,300 H 9,530 10,900 10 600 10,600 A 9,720 ^ 10,800 10,900 10,100 10,800
<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 <250 U
<br /> Gross Alpha Ci/L 15 1 Regulatory Limit NA NA NA NA NA NA NA NA NA NA
<br /> Gross Beta Ci/L none NA NA NA I NA NA NA NA NA NA NA
<br /> Supplementary Anal tes Not Historical) ana zed
<br /> Bicarbonate as CaCO3 m /L none 623 616 611 NA 604 599 615 606 664 613
<br /> Carbonate as CaCO3 m /L none <20 U <20 U <20 U NA <20 U <20 U <20 U <20 U <20 U 6.2 B
<br /> Calcium,Dissolved m /L none 38 37 37 38 38 36.9 38 38 36 37
<br /> Magnesium,Dissolved m /L none 17 18 18 21 17 18 17 17 16.4 18
<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 9
<br /> Sodium,Dissolved m /L none 4,360 4,050 3,950 4,070 4,040 4,030 4,050 4,290 4,020 4,000
<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 /> INA=Analyte not analyzed
<br /> ^=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)
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<br /> OAssociates
<br /> Golder
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