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Appendix C-Historical Water Quality City of Lathrop Consolidated Treatment Facility Monitoring and Reporting Program 115-2016-0028-03 Rev3 CLSP-3 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 8/26/2005 6.66 NA 2,198 -- 100 1,410 NA 147 60 1.0 180 0.68 5.56 0.224 NA ND NA 560 NA 220.0 11/15/2005 5.96 NA 2,377 - 126 1,430 NA 149 66 2.0 197 0.71 5.84 0.274 NA ND NA 550 NA 220.0 2/23/2006 7.06 NO 1,488 - 141 940 NA 95 40 1.0 145 0.54 3.43 0.149 NA NO NA 327 NA 170.0 5/15/2006 6.69 1.1 532 - - 360 NA 30 12 ND 62 1.05 1.19 0.033 NA ND NA 73 NA 60.0 9/14/2006 6.82 NO 784 - -57 440 NA 37 16 1.0 84 0.53 1.61 0.386 NA ND NA 132 NA 82.0 8/12/2013 6.63 8 542 1.70 -57 308 120 29 12 1.5 64 1.50 NA NA NA NA 0.21 63 NA 52.0 8/12/2013 6.63 2 542 1.70 -57 345 110 27 11 1.6 63 0.72 NA NA NA NA 0.21 64 NA 52.0 9/14/2017 6.75 ND 590 0.23 -31 320 130 32 13 3.0 71 1.14 1.34 NA NA NA 0.22 68 NA 60.2 9/14/2017 6.75 NO 590 0.23 -31 320 130 32 13 3.0 71 1.20 1.35 NA NA NA 0.22 68 NA 59.7 11/29/2017 7.13 ND 601 4.02 159 340 120 30 12 1.0 66 0.71 1.14 NA NA NA 0.20 70 NA 64.0 2/28/2018 7.09 ND 630 2.95 88 360 130 32 13 ND 68 0.87 0.89 NA NA NA 0.23 72 NA 68.0 2/28/2018 7.09 ND 630 2.95 88 380 130 32 13 ND 71 0.67 0.96 NA NA NA 0.23 72 NA 67.5 11/6/2018 6.58 ND 608 0.54 9 370 120 29 12 1.0 65 0.75 0.74 NA NA NA 0.23 74 NA 47.1 4/30/2019 6.66 ND 597 0.40 273 320 NA NA NA NA 65 NA NA NA NA NA 0.21 75 NA NA 10/30/2019 6.50 NO 1,138 0.35 49 670 300 73 29 3.0 107 3.20 2.98 NA NA NA 0.67 123 NA 147.0 5/11/2020 6.64 ND 970 2.18 65 690 NA NA NA NA 108 NA NA NA NA NA 0.57 130 NA NA 5/11/2020 6.50 NO 970 2.18 296 660 NA NA NA NA 107 NA NA NA NA NA 0.56 128 NA NA 11/6/2020 6.31 ND 890 0.63 57 570 240 58 24 2.0 104 0.45 0.97 NA NA NA 0.48 114 NA 116.0 5/5/2021 6.43 NO 890 0.75 184 550 NA NA NA NA 93 NA NA NA NA NA 0.46 110 NA NA 10/18/2021" NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 5/3/2022 6.53 NO 912 0.94 75 530 NA NA NA NA 92 NA NA NA NA NA 0.38 107 NA NA 11/4/2022 6.37 23 1,022 0.7 160 560 240 54 25 3.0 104 0.95 1.14 NA NA NA 0.44 106 NA 107.0 11/4/2022 6.37 23 1,022 0.7 160 550 250 59 25 2.0 133 1.25 1.17 NA NA NA 0.46 106 NA 107.0 4/4/2023 6.58 920 682 2.86 522 360 NA NA NA NA 59 NA NA NA NA NA 0.23 89 NA NA Bold values exceed groundwater limitation. NS is"not sampled". NO is"not detected'. NA is"not analyzed'. *Well not sampled due to insufficent volume to sample. City of Lathrop-CLSP3 City of Lathrop-CLSP3 Total Dissolved Solids NOs as Nitrogen 5,000 20 4,000 15 w3,000 E E 10 0 2,000 F 0O 1,000 5 • <> r 0 0 444444444��« .�� �I I-,I-,-, I I-,I»Date 'I-,I-,I-,I-,I-,-,I-, -,�-,�-,�-,�I I-,IAAA- -„-,I-,II-,I-,I-, -, EKI Environment&Water,Inc. July 2023 Page 3 of 281 EKI B90088.03