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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 011 CO3 11CO3 SO4 Cl NO3 NO2 P F B Cu Fe !11n Zn Total Fecal Point Date (pS/cm) as CaCO3 as Ca('O3 as Oil as('03 as HCO3 as NO3 as NO2 (µg/L) (pg/L) (pg/L) (µg/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" Faulkner 12/3/2019 782 450 7.9 219 58 18 66 2 180 <10 <10 220 87.0 76 9.8 <0.7 - 0.2 0.4 <10 <30 <10 <20 <1.1 <1.1 Faulkner 5/20/2020 863 500 7.7 235 63 19 82 2 180 <10 <10 220 79.5 90 11.1 <0.7 - 0.2 0.5 40 80 <10 <20 <1.1 <1.1 Faulkner 11/24/2020 740 420 8.2 210 56 17 64 1 180 <10 <10 230 75.3 65 7.5 <0.7 - 0.2 0.4 <10 90 <10 20 <1.1 <1.1 Faulkner 5/19/2021 701 410 8.1 206 56 16 66 I 180 <10 <10 220 73.1 62 5.9 <0.7 - 0.2 0.4 10 130 <10 40 <1.1 <1.1 Faulkner 11/22/2021 732 420 7.8 189 51 15 62 1 170 <10 <10 210 67.8 66 5.5 <0.7 - 0.2 0.4 <10 90 <10 40 <1.1 <1.1 Faulkner 5/25/2022 724 440 7.7 189 51 15 62 1 170 <10 <10 210 71.2 69 5.6 <0.3 - 0.2 0.4 <10 100 <10 <20 <1.1 <1.1 Faulkner 11/15/2022 696 430 7.5 206 56 16 66 1 180 <10 <10 220 75.6 73 5.9 <0.7 - 0.2 0.4 <10 80 <10 QO <1.1 <1.1 Faulkner 5/16/2023 684 410 7.9 201 54 16 64 1 180 <10 <10 220 68.4 69 8.5 <0.3 - 0.2 0.3 <10 <30 <10 QO <1.1 <1.1 Faulkner 11/15/2023 746 480 7.4 206 56 16 63 2 180 <10 <10 220 77.9 75 15.9 <0.3 - 0.2 0.3 <10 180 20 20 <1.1 <1.1 Faulkner 5/21/2024 800 500 7.3 224 60 18 63 2 180 <10 <10 220 88.5 87 16.1 <O.1 - 0.2 0.4 20 100 <10 60 <1.1 <1.1 Faulkner 11/15/2024 777 480 8.3 222 61 17 64 2 190 <10 <10 230 91.2 76 13.7 <O.1 - 0.2 0.4 10 <30 <10 90 <1.1 <1.1 S.Tracy#1 3/1/1994 920 540 7.5 239 59 22 79 ND 156 ND ND 190 110 57 43.3 ND ND 0.2 1 ND ND ND ND - - S.Tracy#1 6/1/1994 800 530 7.5 280 65 29 86 ND 150 ND ND 190 110 60 47 ND ND ND 1.1 ND ND ND ND - - S.Tracy#1 10/4/1994 840 500 7.5 250 60 23 78 ND 150 ND ND 180 120 70 50 ND ND 0.2 1 ND ND ND ND - - S.Tracy#1 1/19/1995 800 500 7.5 290 62 25 73 ND 150 ND ND 190 120 68 42 ND ND 0.3 1 ND 390 ND ND - - S.Tracy#1 4/26/1995 900 520 7.6 240 58 23 70 ND 160 ND ND 200 120 51 45 ND ND 0.3 1 ND ND ND ND - - S.Tracy#1 7/6/1995 910 520 7.5 260 65 23 69 3 170 ND ND 210 130 64 42 ND ND 0.1 1 ND ND ND ND - - S.Tracy#1 11/11/1995 790 510 7.5 240 60 23 77 ND 180 ND ND 210 120 68 47 ND ND 0.2 0.9 ND ND ND ND - - S.Tracy#1 1/11/1996 790 520 7.4 230 58 22 72 ND 190 ND ND 230 110 64 45 ND ND 0.7 1 ND 200 ND ND - - S.Tracy#13 5/2/1996 800 470 7.4 260 59 28 74 3 170 ND ND 210 130 69 45 ND ND 0.5 1 ND ND ND ND - - S.Tracy#1 7/10/1996 820 520 7.6 260 62 26 68 2 180 ND ND 210 130 66 47 ND ND 0.2 0.9 ND ND ND ND - - S.Tracy#1 10/16/1996 900 480 7.3 250 61 25 73 3 170 ND ND 210 120 68 46 ND ND 0.2 ND ND 330 ND ND - - S.Tracy#1 1/21/1997 790 500 7.9 244 60 23 66 2 160 ND ND 190 110 59 44 ND ND 0.2 1 ND 120 ND ND - - S.Tracy#1 4/9/1997 790 500 6.6 250 64 23 72 2 170 ND ND 200 120 73 48 ND ND 0.5 1 ND ND ND ND - - S.Tracy#1 7/3/1997 790 550 7.3 260 64 24 69 1 170 ND ND 200 130 66 42 ND ND 0.3 1 ND ND ND ND - - S.Tracy#1 1/27/1998 800 460 7.4 240 60 22 66 2 160 ND ND 190 120 65 41 ND ND 0.3 1 ND 90 ND ND - - S.Tracy#1 5/5/1998 800 520 7.6 250 61 23 71 2 160 ND ND 200 120 67 43 ND ND 0.3 1 ND ND ND ND - - S.Tracy#1 8/4/1998 800 520 7.8 250 64 23 70 1 150 ND ND 190 120 68 44 ND ND 0.2 1 ND ND ND ND - - S.Tracy#1 11/4/1998 810 480 7.5 250 62 23 72 2 160 ND ND 190 120 67 40 ND - 0.2 0.9 ND ND ND ND - - S.Tracy#1 2/2/1999 800 530 7.3 250 62 23 70 2 160 ND ND 200 I10 63 40 ND - 0.3 0.9 ND ND ND ND - - S.Tracy#1 8/18/1999 804 490 7.7 245 62 22 69 1 160 ND ND 200 114 61 41.3 ND - 0.4 0.9 ND ND ND ND - - S.Tracy#1 11/17/1999 808 470 7.4 253 65 22 64 2 160 ND ND 200 121 64 41.5 ND - 0.4 1 ND ND ND ND - - S.Tracy#1 9/7/2000 847 530 7.2 248 63 22 78 2 160 ND ND 200 129 66 45.3 ND - 0.3 0.95 ND ND ND ND - - S.Tracy#1 11/28/2000 835 500 7.2 248 63 22 71 2 248 ND ND 200 132 61 40.3 ND - 0.1 1.02 ND ND ND ND - - S.Tracy#1 2/21/2001 832 530 7 252 63 23 73 2 170 ND ND 200 144 63 40.5 ND - 0.2 0.98 ND ND ND ND - - S.Tracy#1 5/23/2001 842 530 7 266 67 24 73 2 170 ND ND 210 140 60 37.2 ND - 0.1 0.99 ND ND ND ND - - S.Tracy#1 8/28/2001 845 550 7.5 244 63 21 80 2 170 ND ND 210 145 59 37.1 ND - 0.3 0.91 ND ND ND ND - - S.Tracy#1 12/11/2001 832 580 7.2 257 65 23 71 2 170 ND ND 210 135 57 36.1 ND - 0.2 0.94 ND ND ND ND - - S.Tracy#1 3/12/2002 834 510 7.3 261 65 24 73 2 170 ND ND 210 144 61 35.6 ND - 0.1 0.93 ND ND ND ND - - S.Tracy#1 6/19/2002 838 550 7.6 262 67 23 70 2 170 ND ND 210 146 59 34.5 ND - 0.2 0.95 ND ND ND ND - - S.Tracy#1 8/7/2002 836 530 7.3 240 62 22 69 2 170 ND ND 210 132 57 34 ND - 0.2 0.87 ND ND ND ND - - S.Tracy#1 10/22/2002 832 540 7.8 259 66 23 73 2 180 ND ND 210 139 58 35.4 ND - 0.2 0.95 ND ND ND ND - - Page 5 of 11