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Appendix C-Historical Water Quality City of Lathrop Consolidated Treatment Facility Monitoring and Reporting Program R5-2016-0028-03 Rev3 MWM-2 Total Data Coliform EC DO ORP Hard- Calcium Magnesium Potassium Sodium Manganese Barium Nickel Bromide Chloride Fluoride Sulfate Sampled PH Bact1eria 00 (uS/cm) (mg/L) (mV) TDS(mg/L) nesL (mg/L) (mg/L) (mg/L) (mg/L) Iron(mg/L) (mg/L) (mg/L) (mg/L) Zinc(mg/L) (mg/L) (mg/L) (mg/L) (mg/L) mg/) mL 5/19/2005 7.54 >1600 1,200 - -- 1,000 NA 129 37 5.1 157 ND 0.47 0.192 ND 0.024 ND 170 NO 290 6/27/2005 7.25 50 1,300 - 140 1,000 NA 140 39 ND 120 ND 0.40 ND ND ND 9.2 130 ND 230 11/7/2005 7.28 30 1,440 0.84 -16 910 410 120 35 4.5 140 0.055 0.78 0.049 0.013 ND 0.52 140 0.34 240 2/6/2006 7.22 14 1,374 5.09 4 920 410 110 32 3.9 140 0.035 0.73 0.042 0.009 ND 0.50 150 0.33 250 5/4/2006 6.82 900 1,346 3.69 97 860 450 130 33 4.1 140 0.020 0.60 0.044 0.006 NO 0.51 140 0.34 250 8/8/2006 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 10/26/2006 7.05 2 1,222 4.47 99 880 340 92 26 2.9 140 ND 0.20 0.046 0.0026 0.002 0.47 150 0.34 200 2/5/2007 7.23 4 1,261 3.96 123 800 270 64 27 3.0 150 0.15 0.16 0.045 0.0012 ND 0.46 140 0.29 190 5/7/2007 7.27 NO 1,271 4.64 60 780 350 97 26 2.5 130 ND 0.16 0.041 0.0022 NO 0.46 150 0.26 210 8/3/2007 6.92 NA 1,413 0.80 148 960 520 130 50 3.7 190 ND 0.07 0.045 0.0010 ND 0.44 160 0.32 280 11/8/2007 6.90 NO 1,711 0.21 30 960 380 95 34 2.7 160 0.17 0.56 0.090 ND ND 0.47 160 0.47 170 2/6/2008 7.00 ND 1,693 0.45 107 1,300 590 160 43 1.7 160 ND 0.010 0.058 0.0035 0.002 0.67 120 0.41 440 4/29/2008 7.2 NA 1,623 0.32 99 1,200 530 150 39 1.9 140 NO 0.028 0.056 0.0052 NO 0.65 140 0.38 400 8/22/2008 7.18 ND 1,688 0.92 87 1,200 540 150 39 2.0 150 ND 0.019 NA NA NA 0.64 130 NA 380 11/24/2008 7.09 70 1,513 0.35 21 1,000 500 140 37 1.9 150 ND 0.012 NA NA NA 0.60 120 NA 310 2/17/2009 7.07 2 1,641 0.44 48 1,100 500 140 36 1.8 140 ND 0.012 NA NA NA 0.59 110 NA 360 4/15/2009 7.06 ND 1,428 0.46 39 940 540 150 41 1.5 120 ND ND NA NA NA 0.58 99 NA 330 7/29/2009 7.33 ND 1,614 4.90 165 1,080 510 144 36 2.0 154 ND 0.010 NA NA NA 0.46 94 NA 360 10/22/2009 7.40 4 1,401 2.70 46 870 420 117 31 2.0 152 NO 0.03 NA NA NA 0.30 63 NA 215 10/22/2009 7.40 13 1,401 2.70 46 860 420 119 30 2.0 156 NO 0.03 NA NA NA 0.32 63 NA 215 2/1/2010 7.28 ND 1,002 3.90 132 740 320 92 23 ND 130 NO 0.01 NA NA NA 0.15 55 NA 142 4/22/2010 8.01 2 994 3.63 57 590 270 77 19 ND 125 NO ND NA NA NA 0.14 49 NA 114 8/26/2010 7.15 130 749 0.41 442 550 240 67 17 ND 116 0.08 0.02 NA NA NA 0.13 40 NA 99 10/20/2010 7.37 ND 903 5.81 202 550 230 65 16 ND 109 ND ND NA NA NA 0.15 45 NA 104 10/20/2010 7.37 ND 899 5.81 202 540 240 68 16 1.0 115 ND ND NA NA NA 0.15 45 NA 106 1/25/2011 7.34 ND 705 0.60 412 510 230 65 16 ND 108 ND ND NA NA NA 0.18 49 NA 88 4/21/2011 7.20 2 1,069 0.23 32 700 320 90 22 1.0 136 ND 0.02 NA NA NA 0.39 127 NA 165 8/18/2011 7.15 8 894 1.56 394 580 240 68 16 1.0 114 0.47 0.24 NA NA NA 0.24 85 NA 121 10/27/2011 7.35 17 902 0.58 359 582 240 69 16 1.0 111 ND 0.07 NA NA NA 0.22 69 NA 106 1/25/2012 7.24 ND 848 0.50 212 490 220 65 15 1.0 108 ND ND NA NA NA 0.23 63 NA 90 5/3/2012 7.22 11 841 3.70 35 510 220 63 15 ND 104 ND ND NA NA NA 0.19 58 NA 84 7/30/2012 7.34 ND 868 1.87 -22 510 220 62 16 1.0 106 ND ND NA NA NA 0.18 59 NA 84 10/25/2012 7.28 ND 899 0.53 62 520 210 61 15 2.0 105 ND ND NA NA NA 0.21 55 NA 83 1/31/2013 7.30 ND 874 0.22 415 530 230 65 16 1.0 109 ND ND NA NA NA 0.21 52 NA 74 5/2/2013 7.41 NO 882 0.96 113 520 240 69 17 ND 107 ND NO NA NA NA 0.17 51 NA 61 8/2/2013 7.29 ND 879 0.96 101 540 230 66 17 ND 101 ND ND NA NA NA 0.23 57 NA 79 11/21/2013 7.22 ND 961 0.62 119 580 270 77 19 1.0 116 NO NO NA NA NA 0.22 56 NA 75 2/5/2014 7.24 425 ,00102 0.857 2556 0 28700 707 109 1.00 1102 0.09 NDD NAA NAA NAA 022 4 NAA 69 9 0 8 1 7 011 N N N 0.284/24/2014 7 2 620 2 59 N 54 NS indicates that well or was not sampled during regular quarterly monitoring. NO is"not detected". NA is"not analyzed". City of Lathrop-MWM-2 City of Lathrop-MWM-2 Total Dissolved Solids NO3+NO2 Nitrogen 5,000 20 4,000 15 3,000 E E 0" 10 0 2,000 Z 0 5 1,000 = 0m`8rrn m8'o o$o`So 0 °0,'44� 949 �ne�n MNH -,�-, --,-,--------, » -,--- --,»-,IA-, --I-I I-I I-I I-I Dale Date EKI Environment&Water,Inc. July 2023 Page 17 of 281 EKI B90088.03