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Table 4 Historical Groundwater Quality Record Teichert Aggregates and Granite Construction-Vernalis Area, San Joaquin County (all units in mg/L unless otherwise specified) Total Total Colitorm Sampling EC TDS pit Hardness Ca Nlg Na h Alkalinity On CO3 HCO3 SO4 Cl NO3 NO2 1, F B C'u Fe Mn Zn Total Fecal Point Date (AS/CM) as CaCO3 as CsCO3 as OR as CO3 as HCO3 as NO3 as NO2 (pg/l.) (µg/l,) (pg/L) (µg/L) (MPN/100 mL) 6.5 to Maximum Contaminant Level 900* 500* 8.5* 250* 250* 45 3 ? 1,000* 300* 50* 5,000* Browns New 7/6/1995 830 550 7.4 280 74 24 74 6 210 ND ND 250 190 37 9.3 ND ND ND 1.2 ND 50 ND 80 - - Brown's New 11/11/1995 830 550 7.5 270 70 23 83 ND 230 ND ND 290 180 38 9.5 ND ND 0.2 1 ND ND ND ND -Brown's New 1/11/1996 860 560 7.4 270 72 23 81 ND 240 ND ND 300 180 39 9.4 ND ND 0.4 1.1 ND ND ND ND Brown's New' 5/2/1996 840 510 7.4 290 69 28 78 2 220 ND ND 270 180 41 11 ND ND 0.5 1.1 ND 1,900 ND ND Brown's New 7/10/19% 850 510 9.1 280 71 26 75 ND 210 12 110 ND 190 40 11 ND ND 0.2 1.1 ND ND ND ND -Brown's New 10/16/1996 860 540 7.4 290 74 25 84 2 210 ND ND 250 200 41 8.6 ND ND ND ND ND 600 ND ND - - Brown's New 1/21/1997 880 540 7.9 288 75 25 78 2 200 ND ND 240 210 42 8.5 ND ND 0.2 1.2 ND 180 ND ND - - Brown's New 7/3/1997 820 580 7.2 300 76 26 87 2 190 ND ND 240 190 41 6.8 ND ND 0.1 1.3 ND 7,400 2" ND - Brown's New 1/27/1998 810 470 7.5 250 64 22 76 1 180 ND ND 220 180 40 6.1 ND ND 0.2 1.1 60 46,000 1,700 ND - Brown's New 9/7/2000 865 570 7.2 256 68 21 81 2 200 ND ND 240 188 40 8.3 ND - 0.2 1.1 ND ND ND ND - Brown's New 2/21/2001 872 570 6.9 272 71 23 82 2 200 ND ND 250 199 41 7.7 ND - 0.1 1.24 30 7,750 260 40 - - Brown's New 5/23/2001 865 580 6.8 286 75 24 81 2 200 ND ND 250 186 39 7.8 ND - 0.1 1.2 10 680 30 20 - Brown's New 11/23/2009 850 540 8.0 261 70 21 82 2 200 ND ND 240 181 38 8.5 <0.3 - 0.2 1.2 <10 140 <10 <20 - Brown's New 5/25/2010 833 520 7.4 261 70 21 81 2 190 ND ND 230 180 38 8.9 <0.3 - 0.2 1.1 <10 110 <10 <20 - Brown's New 11/30/2010 822 560 7.4 268 71 22 76 2 180 ND ND 220 170 36 8.3 <0.3 - 0.1 1.1 70 4,530 70 20 - Brown's New 5/23/2011 932 540 7.2 259 69 21 75 2 180 <10 <10 220 177 36 9.1 <0.3 - 0.2 1.1 300 16,700 300 60 - Brown's New 11/17/20l'1 833 510 8.0 266 72 21 84 2 180 <10 <10 220 178 38 10.2 <0.3 - 0.2 1.1 <10 440 10 QO - Brown's New 5/31/2012 843 510 7.7 268 71 22 82 2 180 <10 <10 220 175 38 9.4 <0.3 - 0.2 1.1 <10 60 <10 <20 - - Brown's New 11/20/2012 834 550 7.9 278 75 22 77 2 180 <10 <10 230 171 37 9.8 <0.3 - 0.2 1 <10 520 <10 80 - - Brown's New 5/20/2013 813 540 7.7 270 72 22 82 2 180 <10 <10 230 171 36 10.3 <0.3 - 0.2 1.1 <10 330 10 50 - - Brown's New 11/18/2013 823 510 7.5 241 57 24 73 2 160 <10 <10 190 210 46 1.1 <0.3 - 0.2 1.4 30 1,010 30 830 - - Browns New 5/14/2014 806 550 7.6 233 52 25 96 3 150 <10 <10 180 203 45 2.4 <0.3 - <O.1 1.3 500 5,380 130 1,010 - - Brown's New 11/12/2014 724 430 7.8 156 28 21 86 2 190 <10 <10 240 197 45 1.6 <0.3 - 0.4 1.1 <10 540 <10 550 - - BrownsNew 5/26/2015 834 530 7.7 242 64 20 79 2 170 <10 <10 210 174 37 8.9 <0.7 - 0.2 1 30 660 <10 370 - - Brown's New 11/17/2015 939 540 7.1 243 66 19 72 1 190 <10 <10 230 174 36 8.8 <0.7 - 0.2 0.9 20 310 <10 <20 - - Brown's New pump contractor working on well,no sample obtained - - Browes New 11/8/2016 813 520 7.3 256 68 21 77 2 140 <10 <10 170 177 39 10 <0.7 - 0.2 1.1 <10 500 30 <20 - - Brown's New 5/23/2017 836 550 7.4 256 68 21 76 2 180 <10 <10 230 178 39 9.9 <0.7 - 0.2 1.1 <10 70 21 <20 - - Brown's New 11/20/2017 1,480 1,120 7.8 475 126 39 88 2 130 <10 <10 160 178 287 <11 <3.28 - 2.2 1.1 <10 10,000 14,100 30 - - Brown's New 5/21/2018 822 540 6.2 244 65 20 72 3 180 <10 <10 220 175 39 10.6 <0.7 - 0.4 1.1 <10 260 20 <20 - - Brown's New 11/14/2018 903 540 8.0 277 73 23 72 1 190 <10 <10 230 180 38 8.8 <0.7 - 0.2 1.1 <10 70 <10 <20 - - Brown's New 5/15/2019 855 510 7.4 266 72 21 71 2 190 <10 <10 220 168 37 13.4 <0.7 - 0.2 0.9 80 7,340 290 <20 - - Brown's New 11/26/2019 907 540 7.8 239 63 20 69 2 190 <10 <10 230 180 39 8.6 <0.7 - 0.2 1.1 <10 550 <10 20 - - Brown's New 5/20/2020 909 550 7.6 265 70 22 79 2 190 <10 <10 240 178 38 9.2 <0.7 - 0.2 1.1 40 50 <10 60 - - Brown's New 11/24/2020 835 540 8.4 267 69 23 72 2 190 <10 <10 230 177 38 11.3 <0.7 - 0.2 1.0 <10 140 <10 <20 - - Brown's New 5/19/2021 854 540 8.0 260 68 22 75 2 190 <10 <10 230 183 39 8.7 <0.7 - 0.2 1.1 <10 120 <10 <20 - - Brown's New 11/22/2021 878 616 7.7 246 64 21 72 2 190 <10 <10 230 179 38 9.6 <0.7 - 0.2 1.0 <10 40 <10 <20 - - Brown's New 5/25/2022 no power to well pump,no sample obtained Brown's New 11/15/2022 831 530 7.3 263 69 22 73 1 190 <10 <10 230 179 39 10.5 <0.7 - 0.3 1.1 <10 30 <10 30 - - Browns New 5/16/2023 849 560 7.6 274 72 23 79 2 190 <10 <10 240 187 40 10.6 <0.3 - 0.2 1.0 <10 <30 <10 20 - - Brown's New 11/15/2023 841 550 7.3 251 66 21 75 2 200 <10 <10 240 181 39 10.5 <0.3 - 0.2 1.1 <10 <30 <10 <20 - - Brown's New 5/21/2024 861 550 7.0 249 65 21 70 2 190 <10 <10 230 186 40 12.8 <0.4 - 0.2 0.9 <10 <30 <10 <20 - - Brown's New 11/15/2024 865 570 7.8 260 68 22 73 2 190 <10 <10 230 185 40 9.8 <O.1 - 0.2 LI <10 <10 <10 QO - - Page 8 of 11