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' July 2017 1772432 Table 4: Summary of Monitoring Results for MW-4 Date Benchmark Benchmark Basis 2/18/2014 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 11/9/2016 5/31/2017 Metals Level Arsenic,Dissolved m /L 017 Statistical Limit <0 01 U <0 01 U NA NA NA NA NA NA NA NA NA NA NA Barium,Dissolved m /L 20 Regulatory Limit 8.58 9.64 8.01 8.56 8.77 8.76 8.81 8.80 8.66 8.79 8.91 8.61 8.95 Boron,Dissolved m /L 075 Statistical Limit 063 06 07 07 0.8 B 06 07 06 0.7 06 .06 061 07 Chromium,Dissolved m /L 03 Statistical Limit <0 02 U <0 02 U NA NA NA NA NA NA NA NA NA NA NA Copper,Dissolved m /L 03 Statistical Limit <0 3 U <0 5 U NA NA NA NA NA NA NA NA NA NA NA Iron,Dissolved m /L 061 Statistical Limit 08 02 B 05 03 B <1 U 03 B 01 B 04 B 02 B 014 <0 5 U 015 <0 5 U Lead Dissolved m /L 005 Regulatory Limit <0 005 U <0 005 U NA NA NA NA NA NA NA NA NA NA NA Lithium,Dissolved m /L 25 Statistical Limit NA NA NA NA NA NA NA NA NA NA NA NA NA Manganese,Dissolved m /L 1.2 Statistical Limit <0 1 U <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 <0 03 U <0 3 U Selenium Dissolved m /L 002 Statistical Limit <0 003 U <0 003 U NA NA NA NA NA NA NA NA NA NA NA Thallium Dissolved m /L 001 Statistical Limit <0 005 U <0 005 U NA NA NA NA NA NA NA NA NA NA NA Uranium,Dissolved m /L 003 Statistical Limit NA NA NA NA NA NA NA NA NA NA NA NA NA Zinc,Dissolved m /L 20 1 Statistical Limit <0 3 U <0 5 U NA NA NA NA NA NA NA NA NA NA NA Other Chloride m /L 8 895 Statistical Limit 7 080 6 450 5 600 6 260 6 650 6,410 6,630 6,880 6,530 6,290 6,350 5,960 6,390 ' Fluoride m /L 2 0 Statistical Limit 1 1 1.13 NA NA NA NA NA NA NA NA NA NA NA Nitrate as N m /L 10 Statistical Limit NA NA NA NA NA NA NA NA NA NA NA NA NA Nitrite as N m /L 1 0 Statistical Limit NA NA NA NA NA NA NA NA NA NA NA NA NA Nitrate+Nitrite as N m /L 10 Statistical Limit NA NA NA NA NA NA NA NA NA NA NA NA NA Lab Hsu 6 5-8 5 Statistical Limit 8 H 79 H 81 H 82 H 8 H 8 1 H 82 H 82 H 8.2 79 H 83 H 82 H 83 H ' Total Dissolved Solids,filterable residue m /L 10,212 Regulatory Limit 10 800 H 10 300 H 9,530 10 900 10 600 10 600 ^ 9 720 ^ 10,800 10,900 10,100 10,800 11,100 10,500 Sulfate m /L 1,322 Statistical Limit <500 U <500 U <500 U <500 U <500 U <500 U <500 U <500 U <500 U <250 U <250 U <250 U <250 U Gross Alpha CdL 15 1 Re ulato Limit NA NA NA NA NA NA NA NA NA NA NA NA NA Gross Beta Ci/L none I NA NA I NA I NA I NA NA NA NA NA NA NA NA NA Supplementary Ana es Not Historical) anal zed ' Bicarbonate as CaCO3 m /L none 606 623 616 611 NA 604 599 615 606 664 613 619 612 Carbonate as CaCO3 m /L none <20 U <20 U <20 U <20 U NA <20 U <20 U <20 U <20 U <20 U 62 B <20 U <20 U Calcium,Dissolved m /L none 361 38 37 37 38 38 369 38 38 36 37 358 36 Magnesium,Dissolved m /L none 16 17 18 18 21 17 18 17 17 16.4 18 r 161 16 Potassium,Dissolved m /L none 9 9 B 9 B 100 120 B 90 90 100 11 0 91 9 1 9 100 Sodium,Dissolved m /L none 4,120 4,360 4,050 3,950 4.070 4,040 4,030 4,050 4,290 4,020 4 000 I 4,160 4 080 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 *Reanalysis performed for analyte,reanalysis result reported ' 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) 1 s s Eiolder 111 T1772<32\0110\GWSamp102017_Fn428Ju11TTables 1-7 xlsxMW-0 Page 2 of 2 N&FAssociates