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Appendix C-Historical Water Quality City of Lathrop <br /> Consolidated Treatment Facility <br /> Monitoring and Reporting Program 115-2016-0028-03 Rev3 <br /> Pond S4 <br /> Total <br /> Date Coliform EC DO ORP Hard- Calcium Magnesium Potassium Sodium Manganese Barium Nickel Bromide Chloride Fluoride Sulfate <br /> 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) <br /> (per 100 (mg/L) <br /> mL <br /> 5/4/2007 9.81 NA 1,246 10.48 173 760 180 47 14 23 200 ND 0.00061 0.10 0.0018 0.011 0.13 230 0.14 70 <br /> 8/3/2007 9.55 NA 1,421 12.70 113 1,000 150 37 14 28 220 NO ND 0.044 0.0020 ND ND 270 0.11 70 <br /> 11/9/2007 9.21 NA 1,295 13.65 151 870 160 42 14 27 190 NA NA ND NA NA 0.14 220 0.13 62 <br /> 10/19/2009 9.07 NA 1,187 7.70 138 660 130 35 11 18 201 NO ND NA NA NA 0.07 226 NA 49 <br /> 4/21/2010 9.36 NA 1,238 16.94 96 720 180 49 14 19 204 ND ND NA NA NA 0.09 214 NA 55 <br /> 11/2/2010 7.81 NA 1,160 19.54 114 670 150 40 13 20 194 NO ND NA NA NA 0.10 219 NA 47 <br /> 4/19/2011 9.60 NA 1,086 18.22 152 690 150 37 15 17 197 ND ND NA NA NA 0.17 214 NA 52 <br /> 11/1/2011 9.11 NA 1,317 15.22 350 740 180 49 13 17 187 ND ND NA NA NA 0.07 217 NA 55 <br /> 4/25/2012 9.21 NA 1,288 3.79 84 740 200 58 14 18 179 ND ND NA NA NA 0.13 225 NA 60 <br /> 10/26/2012 8.44 NA 1,274 13.97 154 700 190 52 14 21 187 NO ND NA NA NA 0.31 203 NA 48 <br /> 5/3/2013 7.26 NA 1,221 7.04 402 700 150 42 12 18 176 ND ND NA NA NA 0.19 208 NA 56 <br /> 11/22/2013 7.83 NA 1,146 10.19 248 640 180 51 13 20 155 ND ND NA NA NA 0.08 196 NA 47 <br /> NO is"not detected". <br /> NA is"not analyzed". <br /> Pond S4 was converted to an emergency influent storage pond.Recycled water has not been discharge to Pond S4 since April 2014. <br /> Pond S4 Pond S4 <br /> Total Dissolved Solids NO,+NO2 Nitrogen <br /> 5,000 20.0 <br /> 4,000 <br /> E 15.0 <br /> 'db 3,000 z <br /> E <br /> w 2,000 10.0 <br /> � O <br /> ~ 1,000 z 5.0 <br /> 0 z 0.0 <br /> °14444444444 o .ww-h--m-N <br /> -.-.�-.-.��-���-.��-• Date <br /> Date <br /> EKI Environment&Water,Inc. <br /> July 2023 Page 271 of 281 EKI B90088.03 <br />