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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 Coliform Sampling EC TDS pH Hardness Ca Mg Na K Alkalinity OH ('O3 IICO3 SO4 Cl NO3 NO2 P F B Cu Fe Mn 7.n Total Fecal Point Date (Pwcm) as CaCO3 as CaCO3 as OH as CO3 as IICO3 as NO3 as NO2 (pg/L) (pg/L) (pg/L) (pg/L) (MPN/100 mL) 6.5 to Maximum Contaminant Level' 900' 500' 8.5• - - - - - 250' 250• 45 3 2 - 1,000' 300' 50* 5,000* S.Tracy#3 5/20/2013 842 520 7.2 273 70 24 76 2 170 <10 <10 200 154 56 26.3 <0.3 - 0.3 0.9 <10 <50 <10 <20 -S.Tracy#3 11/18/2013 842 530 7.1 265 65 25 61 2 160 <10 <10 190 160 69 29.4 <0.3 - 0.2 1.0 <10 <50 <10 <20 S.Tracy 93 5/14/2014 814 540 7.9 264 68 23 71 2 170 <10 <10 200 156 55 25.2 <0.3 - <O.1 0.9 <10 110 <10 QO -S.Tracy#3 11/12/2014 842 510 7.6 262 67 23 71 2 170 <10 <10 210 159 59 28.5 <0.3 - 0.2 0.9 <10 60 <10 QO -S.Tracy 93 5/26/2015 860 530 7.6 254 67 21 70 2 170 <10 <10 210 151 55 25.1 <0.7 - 0.2 0.8 <10 <30 <10 <20 -S.Tracy#3 11/17/2015 852 520 7.2 246 64 21 67 1 180 <10 <10 210 153 51 22.8 <0.7 - 0.2 0.8 <10 <30 <10 <20 -S.Tracy#3 5/24/2016 868 550 7.7 264 68 23 74 2 160 <10 <10 190 182 58 22.7 <0.7 - 0.3 0.9 <10 <30 <10 <20 -S.Tracy#3 11/8/2016 856 540 6.8 267 69 23 74 2 180 <10 <10 220 161 53 22.9 <0.7 - 0.2 0.9 <10 50 <10 <20 -S.Tracy#3 5/23/2017 838 530 7.0 262 67 23 71 2 170 <10 <10 210 156 53 24.1 <0.7 - 0.2 0.9 <10 <30 <10 QO S.Tracy 93 11/20/2017 841 540 9.2 271 69 24 75 2 170 <10 <10 210 152 57 24.9 <0.7 - 0.2 1 <10 100 <10 <20 -S.Tracy#3 5/21/2018 828 490 6.0 248 63 22 69 4 170 <10 <10 210 146 58 27.5 <0.7 - 0.2 0.9 <10 60 <10 <20 -S.Tracy#3 11/14/2018 851 540 7.9 278 70 25 66 1 170 <10 <10 210 150 56 25.4 <0.7 - 0.2 0.9 <10 <30 <10 <20 -S.Tracy#3 5/14/2019 856 530 7.5 281 73 24 74 2 150 <10 <10 180 149 53 24.0 <0.7 - 0.2 1.0 <10 40 <10 QO -S.Tracy#3 11/26/2019 841 550 7.9 245 62 22 64 2 170 <10 <10 210 155 56 24.5 <0.7 - 0.2 0.8 <10 <30 <10 <20 -S.Tracy#3 5/20/2020 885 530 7.9 268 68 24 74 2 180 <10 <10 220 147 55 24.7 <0.7 - 0.2 0.9 <10 <30 <10 <20 -S.Tracy#3 11/24/2020 875 530 8.5 248 63 22 65 2 180 <10 <10 220 154 53 22.3 <0.7 - 0.2 0.9 <10 <30 <10 QO - - Brown's New 6/1/1994 840 570 7.5 290 72 28 87 ND 200 ND ND 240 150 30 8.3 ND ND 0.2 1.3 ND ND ND ND - - Brown's New 10/4/1994 870 530 7.5 280 68 24 84 ND 190 ND ND 230 160 35 8.1 ND ND 0.1 1.1 ND ND ND ND - - Brown's New 1/19/1995 860 550 7.5 290 67 25 80 1.5 190 ND ND 230 180 38 8.5 ND ND 0.2 1.1 ND 290 50 ND - Brown's New 4/26/1995 830 550 7.5 260 68 23 75 ND 210 ND ND 260 190 35 9.1 ND ND 0.2 1.1 ND ND ND ND - - Brown's 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 7/10/1996 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 7,400 290 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 QO - - 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 832 540 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 11/17/2011 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 QO - - 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 - - Brown's 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 - - Page 7 of 10