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Appendix C-Historical Water Quality City of Lathrop Consolidated Treatment Facility Monitoring and Reporting Program 115-2016-0028-03 Rev3 Pond S2 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 5/7/2007 9.56 NA 1,352 8.12 61 800 160 42 15 22 220 NO 0.0017 0.027 0.0032 0.0039 0.18 260 0.14 83 8/2/2007 9.18 NA 1,990 1.80 -183 1,500 120 27 12 41 370 NO 0.00079 0.073 0.0039 ND 0.31 440 0.14 120 11/12/2007 9.23 NA 1,497 10.70 fit 970 150 38 13 30 210 NO 0.00081 0.063 0.0020 0.0083 0.16 270 0.13 72 10/26/2009 9.09 NA 1,475 7.70 35 820 120 27 13 25 263 NO NO NA NA NA 0.14 297 NA 70 5/3/2010 10.30 NA 1,307 7.35 118 710 140 39 11 21 227 NO NO NA NA NA 0.08 237 NA 56 11/2/2010 7.71 NA 1,460 11.95 100 820 120 28 12 29 283 NO NO NA NA NA 0.11 302 NA 68 4/25/2011 9.38 NA 1,142 13.23 23 680 160 44 13 19 180 NO NO NA NA NA 0.16 203 NA 49 10/27/2011 9.18 NA 1,367 11.13 351 710 110 27 11 23 210 ND ND NA NA NA 0.21 259 NA 65 4/30/2012 9.51 NA 1,050 8.22 190 630 180 48 14 14 156 ND ND NA NA NA 0.19 188 NA 54 4/30/2012 9.51 13 1,050 8.22 190 630 180 48 14 14 156 NO ND NA NA NA 0.19 184 NA 54 10/23/2012 8.97 NA 1,522 10.31 -74 860 170 45 15 21 238 ND ND NA NA NA 0.17 261 NA 63 5/2/2013 9.73 NA 1,298 11.68 141 750 180 48 15 19 202 NO NO NA NA NA 0.15 255 NA 57 11/18/2013 9.68 NA 1,189 13.10 134 710 160 41 13 21 189 ND ND NA NA NA 0.14 236 NA 52 4/24/2014 8.54 NA 1,237 8.72 75 720 190 51 16 21 172 0.1 NO NA NA NA 0.17 209 NA 44 11/3/2014 8.71 NA 1,382 11.83 185 810 140 35 12 25 210 0.04 ND NA NA NA 0.17 272 NA 62 10/27/2015 8.67 NA 1,501 8.48 11 880 170 41 17 27 232 NO ND NA NA NA 0.27 273 NA 82 4/25/2016 9.42 NA 1,319 10.94 -36 750 130 25 17 21 209 NA NA NA NA NA 0.33 227 NA 88 11/1/2016 8.82 NA 1,400 4.18 32 820 150 33 16 25 216 NO NO NA NA NA 0.69 236 NA 91.2 11/27/2017 8.59 NA 1,454 3.14 214 810 130 19 19 23 225 ND ND NA NA NA 0.31 254 NA 86.9 10/29/2019 8.89 NA 1,659 10.53 212 970 160 36 16 37 261 ND ND NA NA NA 0.22 306 NA 79.1 NO is"not detected". NA is"not analyzed". Pond S2 Pond S2 Total Dissolved Solids NO,+NO,Nitrogen 5,000 20 4,000 E 15 J pl 3,000 = E m 10 0 2,000 ~ 1,000 ? 5 O 0 0 oSo �nv��wrnnNNNN oho r•+v�n MNrn Date Date EKI Environment&Water,Inc. July 2023 Page 269 of 281 EKI B90088.03