IMPROVE Steering Committee Meeting Petaluma, California 2019 Tracy - PowerPoint PPT Presentation

IMPROVE Steering Committee Meeting Petaluma, California 2019 Tracy Dombek, Ions Report www.rti.org RTI International is a registered trademark and a trade name of Research Triangle Institute.

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Minimum Detection Limits RTI International Chloride Nitrite Nitrate Sulfate 2019 0.005 ppm 0.010 ppm 0.008 ppm 0.011 ppm  Calibrate systems daily  Quality Controls before and after every ten samples analyzed.  Duplicates at a rate of 3 per batch of 50.  Instrument and Method Blanks every batch extracted and analyzed.  Random reanalysis of 5% of the sample total.  Re-extraction of filters to evaluate extraction efficiencies. 3

Quality Control Standards RTI International Average Recovery Average Recovery Average Recovery Average Recovery Nitrite Nitrate Sulfate Chloride QC-Low 101% 97.2% 98.7% 99.2% n= 587 QC-Med 101% 98.8% 99.4% 99.7% n=901 QC-Med-HI 101% 100% 99.9% 99.8% n=560 QC-High 101% 102% 100% 101% n-= 297 4

Instrument Control Charts Instrument Low QC - Cl Instrument Low QC - NO2 230 450 440 220 Concentration ug/L Concentration ug/L 430 420 210 410 200 400 390 190 380 370 180 360 350 170 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 Analysis Date Analysis Date Instrument Low QC - SO4 Instrument Low QC - NO3 680 1320 660 Concentration ug/L 1270 640 Concentration ug/L 620 1220 600 1170 580 560 1120 540 520 1070 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 Analysis Date Analysis Date

Instrument Control Charts RTI International Instrument MED QC - NO2 Instrument MED QC - Cl 565 1150 Concentration (ug/L) 545 Concentration ug/L 1100 525 1050 505 1000 485 950 465 900 445 850 425 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 Analysis Date Analysis Date Instrument Med QC - NO3 Instrument Med QC - SO4 1675 3275 1625 Concentration (ug/L) 3175 Concentration ug/L 1575 3075 1525 2975 1475 2875 1425 2775 1375 1325 2675 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 Analysis Date Analysis Date 6

Instrument Control Charts RTI International Instrument Med-HI QC - Cl Instrument Med-Hi QC – NO2 2250 1090 2200 Concentration (ug/L) Concentration ug/L 2150 2100 1040 2050 2000 990 1950 1900 940 1850 1800 890 1750 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 Analysis Date Analysis Date Instrument Med-Hi QC - NO3 Instrument Med-Hi QC - SO4 6590 3290 6390 3190 Concentration ug/L Concentration ug/L 6190 3090 5990 2990 5790 2890 5590 2790 5390 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 2690 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 Analysis Date Analysis Date 7

25 th , 50 th ,& 75 th Percentile Chloride RTI International QA25 25th Percentile QA50 50th Percentile Concentration Chloride Concentration Chloride 35 75 33 Concentration ug/L 70 31 Concentration ug/L 65 29 60 27 55 25 50 45 23 40 21 35 19 30 17 25 15 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 Analysis Date Analysis Date QA75 75th Percentile Concentration Chloride Approximate Air Concentrations 135 130 Concentration ug/L 25 th Chloride - 0.016 ug/m 3 125 120 115 50 th Chloride – 0.031 ug/m 3 110 105 100 75 th Chloride - 0.061 ug/m 3 95 90 85 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 Analysis Date 8

25 th , 50 th , & 75 th Percentile Nitrite RTI International QA50 50th Percentile Concentration QA25 25th Percentile Concentration Nitrite Nitrite 32 17 Concentration ug/L 30 Concentration ug/L 28 15 26 24 13 22 11 20 18 9 16 14 7 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 12 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 Analysis Date Analysis Date QA75 75th Percentile Concentration Approximate Air Concentration Nitrite 65 Concentration ug/L 25 th Nitrite – 0.007 ug/m 3 60 55 50 th Nitrite – 0.013 ug/m 3 50 45 75 th Nitrite – 0.026 ug/m 3 40 35 30 25 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 Analysis Date 9

25 th , 50 th , & 75 th Percentile Nitrate RTI International QA50 50th Percentile Concentration QA25 25th Percentile Concentration Nitrate Nitrate 340 170 Concentration ug/L Concentration ug/L 330 165 320 160 310 155 300 150 290 145 280 140 270 135 130 260 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 Analysis Date Analysis Date QA75 75th Percentile Concentration Approximate Air Concentration Nitrate 670 25 th Nitrate – 0.092 ug/m 3 Concentration ug/L 650 630 50 th Nitrate – 0.18 ug/m 3 610 590 570 75 th Nitrate – 0.36 ug/m 3 550 530 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 Analysis Date 10

25 th , 50 th , & 75 th Percentile Sulfate RTI International QA25 25th Percentile Concentration QA50 50th Percentile Concentration Sulfate Sulfate 565 565 545 Concentration ug/L Concentration ug/L 545 525 525 505 505 485 485 465 465 445 445 425 425 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 Analysis Date Analysis Date QA75 75th Percentile Concentration Approximate Air Concentration Sulfate 2225 25 th Sulfate – 0.30 ug/m 3 2175 Concentration ug/L 2125 2075 50 th Sulfate – 0.60 ug/m 3 2025 1975 1925 75 th Sulfate – 1.2 ug/m 3 1875 1825 1775 12/16/18 2/4/19 3/26/19 5/15/19 7/4/19 8/23/19 10/12/19 Analysis Date 11

Duplicate Precision RTI International 2019 Chloride Duplicate Precision 4500 Chloride Percent Differences Duplicate Sample Concentration 4000 y = 1.0006x + 0.3519 Average = -0.28% 3500 R² = 0.9988 3000 Median = 0.03% 2500 (ug/L) Maximum = 35.3% 2000 1500 Minimum = -130.% 1000 Count = 789 500 0 Failures 0.3% 0 1000 2000 3000 4000 5000 Sample Concentration (ug/mL) 2019 Nitrite Duplicate Precision Duplicate Sample Concentration 250 Nitrite Percent Differences y = 1.0046x - 0.1333 200 R² = 0.9856 Average = 4.2% (ug/L) 150 Median = 0% 100 Maximum = 200% Minimum = -200 % 50 Count = 789 0 0 50 100 150 200 250 Failures 0% -50 Sample Concentration (ug/mL) 12

Duplicate Precision RTI International 2019 Nitrate Duplicate Precision Duplicate Sample Concentration Nitrate Percent Differences 25000 Average = 0.10% 20000 y = 0.9995x + 0.0247 Median = 0.07% R² = 1 (ug/L) 15000 Maximum = 38% 10000 Minimum = -38 % Count = 789 5000 Failures 0% 0 0 5000 10000 15000 20000 25000 Sample Concentration (ug/mL) 2019 Sulfate Duplicate Precision Duplicate Sample Concentration 25000 Sulfate Percent Differences y = 0.9987x + 0.7877 Average = 0.19% 20000 R² = 0.9999 (ug/L) Median = 0.06% 15000 Maximum = 200% 10000 Minimum = -146% 5000 Count = 789 Failures 0% 0 0 5000 10000 15000 20000 25000 Sample Concentration (ug/mL) 13

Blank Analyses RTI International 2019 Chloride Instrument Blanks 2019 Nitrite Instrument Blanks 16 1 Chloride Concentration (ug/L) 0.9 Nitrite Concentration (ug/L) 14 0.8 12 0.7 10 0.6 8 0.5 0.4 6 0.3 4 0.2 2 0.1 0 0 12/16/2018 2/4/2019 3/26/2019 5/15/2019 7/4/2019 8/23/2019 10/12/2019 12/16/2018 2/4/2019 3/26/2019 5/15/2019 7/4/2019 8/23/2019 10/12/2019 Analysis Date Analysis Date 2019 Chloride Method Blanks 2019 Nitrite Method Blanks 40 Chloride Concentration (ug/L) 25 35 Nitrite Concentration (ug/L) 30 20 25 15 20 15 10 10 5 5 0 0 12/16/2018 2/4/2019 3/26/2019 5/15/2019 7/4/2019 8/23/2019 10/12/2019 12/16/2018 2/4/2019 3/26/2019 5/15/2019 7/4/2019 8/23/2019 10/12/2019 Analysis Date Analysis Date

Blank Analyses RTI International

Blank Analyses RTI International 2019 Sulfate Instrument Blanks 2019 Nitrate Instrument Blanks 25 1 Sulfate Concentration (ug/L) Nitrate Concentration (ug/L) 0.9 20 0.8 0.7 15 0.6 0.5 10 0.4 0.3 5 0.2 0.1 0 0 12/16/2018 2/4/2019 3/26/2019 5/15/2019 7/4/2019 8/23/2019 10/12/2019 12/16/2018 2/4/2019 3/26/2019 5/15/2019 7/4/2019 8/23/2019 10/12/2019 Analysis Date Analysis Date 2019 Nitrate Method Blanks 2019 Sulfate Method Blanks 14 25 Nitrate Concentration (ug/L) Sulfate Concentration (ug/L) 12 20 10 15 8 6 10 4 5 2 0 0 12/16/2018 2/4/2019 3/26/2019 5/15/2019 7/4/2019 8/23/2019 10/12/2019 12/16/2018 2/4/2019 3/26/2019 5/15/2019 7/4/2019 8/23/2019 10/12/2019 Analysis Date Analysis Date

Reanalysis RTI International Chloride Nitrite Nitrate Sulfate 2019 median RPD 0.03% 0% -0.59% 0.01% 2019 Average RPD 0.26% -0.51% 0.21% 0.52%

Routine Filter Re-Extraction RTI International  Extraction efficiencies were evaluated on nearly 200 samples  Efficiency is determined by dividing the result measured on the re-extracted filter by the sum of the original and re-extracted results. Chloride Nitrite Nitrate Sulfate 98.0% 95.5% 99.9%

Comparison of Nitrate Measured in Field Blanks RTI International