24-Hour 2019 Design Value Estimation

4-km CMAQ simulation for the SJV domain

2005 2006 20072007 DV 2017 2018 20192019 DV 55.0 52.0 57.4 54.8 24.6 23.9 25.724.7 3 3 3 3 3 3

RRF Q1 Q4 NH4 0.56 0.58 NO3 0.53 0.55 SO4 0.76 0.84 OC 0.25 0.27 EC 0.20 0.22 Salt 0.83 0.69 Geologic 0.65 0.75
Split Q1 Q4 NH4 0.13 0.11 NO3 0.39 0.35 SO4 0.05 0.02 OC 0.31 0.39 EC 0.02 0.04 Salt 0.01 0.01 Geologic 0.02 0.02 PB Water 0.08 0.07 Total 1.00 1.00

2005→ 2017 2005Q1 2/3/20051/16/20052/12/20051/25/20051/31/20053/8/20051/13/20051/19/2005 53.0 42.0 31.0 30.0 29.0 29.0 27.0 25.0 NH4 6.86 5.42 3.98 3.85 3.72 3.72 3.46 3.20 NO3 20.39 16.1211.84 11.46 11.0711.07 10.29 9.51 SO4 2.50 1.98 1.45 1.40 1.36 1.36 1.26 1.17 OC 16.39 12.96 9.52 9.21 8.90 8.90 8.27 7.65 EC 0.89 0.70 0.52 0.50 0.48 0.48 0.45 0.41 Salt 0.37 0.29 0.21 0.21 0.20 0.20 0.18 0.17 Geologic 1.14 0.90 0.66 0.64 0.62 0.62 0.58 0.53 PB Water 3.97 3.14 2.31 2.23 2.16 2.16 2.00 1.85 Total 52.5 41.5 30.5 29.5 28.5 28.5 26.5 24.5

2017Q1 NH4 3.83 3.03 2.23 2.15 2.08 2.08 1.93 1.79 NO3 10.73 8.48 6.23 6.03 5.82 5.82 5.42 5.01 SO4 1.91 1.51 1.11 1.07 1.04 1.04 0.96 0.89 OC 4.05 3.20 2.35 2.28 2.20 2.20 2.04 1.89 EC 0.18 0.14 0.10 0.10 0.10 0.10 0.09 0.08 Salt 0.30 0.24 0.18 0.17 0.16 0.16 0.15 0.14 Geologic 0.74 0.59 0.43 0.42 0.40 0.40 0.37 0.35 PB Water 2.13 1.68 1.24 1.19 1.15 1.15 1.07 0.99 Blank 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Total 24.4 19.4 14.4 13.9 13.5 13.5 12.5 11.6 Modesto - 14th Street

98th Percentile Rank

Current Mass

Future Mass2005Q4 12/12/200511/21/200512/6/200512/15/200511/18/200512/9/200511/24/200512/21/2005 80.0 61.0 55.0 45.0 41.0 39.0 37.0 34.0 NH4 8.83 6.72 6.05 4.94 4.50 4.27 4.05 3.72 NO3 27.9621.2719.16 15.65 14.2413.54 12.83 11.78 SO4 1.89 1.44 1.30 1.06 0.96 0.92 0.87 0.80 OC 30.7723.4121.09 17.22 15.6714.90 14.13 12.97 EC 2.78 2.12 1.91 1.56 1.42 1.35 1.28 1.17 Salt 0.62 0.47 0.42 0.35 0.32 0.30 0.28 0.26 Geologic 1.31 1.00 0.90 0.74 0.67 0.64 0.60 0.55 PB Water 5.34 4.07 3.66 2.99 2.72 2.59 2.45 2.25 Total 79.5 60.5 54.5 44.5 40.5 38.5 36.5 33.5

2017Q4 NH4 5.05 3.84 3.46 2.83 2.57 2.45 2.32 2.13 NO3 15.3411.6710.51 8.58 7.81 7.43 7.04 6.46 SO4 1.59 1.21 1.09 0.89 0.81 0.77 0.73 0.67 OC 8.16 6.21 5.59 4.57 4.16 3.95 3.74 3.44 EC 0.61 0.46 0.42 0.34 0.31 0.29 0.28 0.26 Salt 0.42 0.32 0.29 0.24 0.22 0.21 0.19 0.18 Geologic 0.98 0.75 0.67 0.55 0.50 0.48 0.45 0.41 PB Water 2.96 2.25 2.03 1.66 1.51 1.44 1.36 1.25 Blank 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Total 35.6 27.2 24.6 20.2 18.4 17.5 16.6 15.3

2006→ 2018 Current Mass2006Q1 2/10/20062/25/20061/11/20061/5/20061/20/20062/22/20062/13/20061/17/2006 52.0 42.0 38.0 37.0 33.0 33.0 27.0 26.0 NH4 6.73 5.42 4.90 4.77 4.24 4.24 3.46 3.33 NO3 20.00 16.1214.56 14.17 12.6212.62 10.29 9.90 SO4 2.45 1.98 1.79 1.74 1.55 1.55 1.26 1.21 OC 16.08 12.9611.71 11.39 10.1510.15 8.27 7.96 EC 0.87 0.70 0.63 0.62 0.55 0.55 0.45 0.43 Salt 0.36 0.29 0.26 0.25 0.23 0.23 0.18 0.18 Geologic 1.12 0.90 0.82 0.79 0.71 0.71 0.58 0.55 PB Water 3.90 3.14 2.84 2.76 2.46 2.46 2.00 1.93 Total 51.5 41.5 37.5 36.5 32.5 32.5 26.5 25.5

2018Q1 NH4 3.76 3.03 2.74 2.66 2.37 2.37 1.93 1.86 NO3 10.52 8.48 7.66 7.46 6.64 6.64 5.42 5.21 SO4 1.87 1.51 1.36 1.33 1.18 1.18 0.96 0.93 OC 3.97 3.20 2.89 2.82 2.51 2.51 2.04 1.97 EC 0.17 0.14 0.13 0.12 0.11 0.11 0.09 0.09 Salt 0.30 0.24 0.22 0.21 0.19 0.19 0.15 0.15 Geologic 0.73 0.59 0.53 0.51 0.46 0.46 0.37 0.36 PB Water 2.09 1.68 1.52 1.48 1.32 1.32 1.07 1.03 Blank 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Total 23.91 19.3717.55 17.09 15.2815.28 12.55 12.09 Future Mass Current Mass

Future Mass2006Q4 12/7/200612/31/200612/4/200612/19/200612/25/200612/13/200612/1/200611/25/2006 71.0 54.0 45.0 44.0 39.0 32.0 26.0 25.0 NH4 7.83 5.94 4.94 4.83 4.27 3.50 2.83 2.72 NO3 24.79 18.8115.65 15.30 13.5411.08 8.97 8.62 SO4 1.68 1.27 1.06 1.04 0.92 0.75 0.61 0.58 OC 27.2820.7117.22 16.8414.9012.19 9.87 9.48 EC 2.47 1.87 1.56 1.52 1.35 1.10 0.89 0.86 Salt 0.55 0.42 0.35 0.34 0.30 0.25 0.20 0.19 Geologic 1.17 0.88 0.74 0.72 0.64 0.52 0.42 0.41 PB Water 4.74 3.60 2.99 2.92 2.59 2.12 1.71 1.65 Total 70.5 53.5 44.5 43.5 38.5 31.5 25.5 24.5

2018Q4 NH4 4.48 3.40 2.83 2.76 2.45 2.00 1.62 1.56 NO3 13.60 10.32 8.58 8.39 7.43 6.08 4.92 4.73 SO4 1.41 1.07 0.89 0.87 0.77 0.63 0.51 0.49 OC 7.23 5.49 4.57 4.46 3.95 3.23 2.62 2.51 EC 0.54 0.41 0.34 0.33 0.29 0.24 0.19 0.19 Salt 0.38 0.29 0.24 0.23 0.21 0.17 0.14 0.13 Geologic 0.87 0.66 0.55 0.54 0.48 0.39 0.31 0.30 PB Water 2.63 1.99 1.66 1.62 1.44 1.17 0.95 0.91 Blank 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Total 31.6 24.1 20.2 19.7 17.5 14.4 11.8 11.3

2007→ 2019 2007Q1 2/5/20071/24/20071/9/20072/8/20071/3/20071/15/20071/27/20071/30/2007 64.0 56.0 50.0 49.0 44.0 42.0 42.0 39.0 NH4 8.29 7.25 6.46 6.33 5.68 5.42 5.42 5.03 NO3 24.6621.5519.22 18.83 16.8916.12 16.12 14.95 SO4 3.02 2.64 2.36 2.31 2.07 1.98 1.98 1.83 OC 19.82 17.3315.45 15.1413.5812.96 12.96 12.02 EC 1.07 0.94 0.84 0.82 0.74 0.70 0.70 0.65 Salt 0.44 0.39 0.35 0.34 0.30 0.29 0.29 0.27 Geologic 1.38 1.21 1.08 1.05 0.95 0.90 0.90 0.84 PB Water 4.80 4.20 3.74 3.67 3.29 3.14 3.14 2.91 Total 63.5 55.5 49.5 48.5 43.5 41.5 41.5 38.5

2019Q1 NH4 4.63 4.05 3.61 3.54 3.17 3.03 3.03 2.81 NO3 12.98 11.3410.12 9.91 8.89 8.48 8.48 7.87 SO4 2.31 2.02 1.80 1.77 1.58 1.51 1.51 1.40 OC 4.90 4.28 3.82 3.74 3.36 3.20 3.20 2.97 EC 0.21 0.19 0.17 0.16 0.15 0.14 0.14 0.13 Salt 0.37 0.32 0.29 0.28 0.25 0.24 0.24 0.22 Geologic 0.90 0.78 0.70 0.68 0.61 0.59 0.59 0.54 PB Water 2.57 2.25 2.00 1.96 1.76 1.68 1.68 1.56 Blank 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Total 29.4 25.7 23.0 22.6 20.3 19.4 19.4 18.0 Current Mass

Future Mass

Current Mass

Future Mass2007Q4 11/29/200711/26/200712/14/200712/17/200712/29/200712/10/200712/23/200711/8/2007 59.7 57.4 53.9 39.8 30.0 29.8 26.2 25.7 NH4 6.57 6.32 5.93 4.36 3.27 3.25 2.85 2.80 NO3 20.8220.0118.78 13.82 10.3710.30 9.04 8.86 SO4 1.41 1.35 1.27 0.94 0.70 0.70 0.61 0.60 OC 22.9122.0220.67 15.21 11.4211.34 9.95 9.75 EC 2.07 1.99 1.87 1.38 1.03 1.03 0.90 0.88 Salt 0.46 0.44 0.42 0.31 0.23 0.23 0.20 0.20 Geologic 0.98 0.94 0.88 0.65 0.49 0.48 0.42 0.42 PB Water 3.98 3.82 3.59 2.64 1.98 1.97 1.73 1.69 Total 59.2 56.9 53.4 39.3 29.5 29.3 25.7 25.2

2019Q4 NH4 3.76 3.61 3.39 2.50 1.87 1.86 1.63 1.60 NO3 11.42 10.9810.30 7.58 5.69 5.65 4.96 4.86 SO4 1.19 1.14 1.07 0.79 0.59 0.59 0.51 0.50 OC 6.07 5.84 5.48 4.03 3.03 3.01 2.64 2.59 EC 0.45 0.43 0.41 0.30 0.23 0.22 0.20 0.19 Salt 0.32 0.30 0.29 0.21 0.16 0.16 0.14 0.13 Geologic 0.73 0.70 0.66 0.49 0.36 0.36 0.32 0.31 PB Water 2.21 2.12 1.99 1.46 1.10 1.09 0.96 0.94 Blank 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Total 26.6425.6324.08 17.86 13.5313.44 11.85 11.63 Future Mass Current Mass