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Appendix C-Historical Water Quality City of Lathrop Consolidated Treatment Facility Monitoring and Reporting Program R5-2016-0028-03 Rev3 Pond S6 Total Date Coliform EC DO ORP Hard- Calcium Magnesium Potassium Sodium Manganese Barium Nickel Bromide Chloride Fluoride Sulfate Sampled pH Bacteria (uS/cm) (mg/L) (mV) TDS(mg/L) mess (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) (per 100 (mg/L) mL 11/1/2010 NA NA 1,470 4.02 - 1,070 340 47 55 46 233 0.08 ND NA NA NA 5.2 200 NA 32 4/25/2011 8.95 NA 1,119 7.71 120 670 160 41 15 18 173 ND NO NA NA NA 0.19 201 NA 53 10/25/2011 8.46 NA 987 16.67 265 570 310 92 20 5.0 86 ND 0.02 NA NA NA 0.32 115 NA 53 4/27/2012 9.04 NA 713 9.39 69 420 150 34 17 4.0 84 ND ND NA NA NA 0.31 122 NA 54 10/30/2012 9.37 NA 969 8.77 -21 610 150 31 17 6.0 140 ND ND NA NA NA 0.53 181 NA 76 5/3/2013 9.22 NA 1,138 10.64 229 650 140 35 14 13 156 ND ND NA NA NA 0.30 209 NA 63 4/29/2014 9.29 NA 1,354 10.86 199 810 190 49 17 22 194 0.12 ND NA NA NA 0.20 234 NA 60.1 10/28/2015 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 4/25/2016 9.04 NA 1,419 9.44 -35 840 160 38 17 23 221 NA NA NA NA NA 0.37 235 NA 84 11/30/2017 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 11/8/2018 9.08 NA 1,859 11.80 171 1,060 200 43 23 ND 273 ND ND NA NA NA 0.35 352 NA 92 10/29/2019 8.92 NA 3,211 10.56 187 1,880 90 17 11 86 556 0 0 NA NA NA 0.64 690 NA 155 10/31/2022 9.10 NA 1,335 14.16 132 700 120 32 10 29 184 ND ND NA NA NA 0.60 234 NA 64 1 012 8/2 01 5 Tond S6 was dry at the time of sampling,so no sample was collected. 11/30/2017 Tond S6 was dry at the time of sampling,so no sample was collected. NO is"not detected". NA is"not analyzed". NS is"not sampled". Pond S6 Pond S6 Total Dissolved Solids NOa+NOz Nitrogen 5,000 20.0 4,000 E 15.0 w 3,000 z E m 10.0 n 2,000 C ~ 1,000 z5.0 O 0 z 0.0 08o Maw Mry� Date Data EKI Environment&Water,Inc. July 2023 Page 275 of 281 EKI B90088.03