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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 Ilardness Ca N1g Na 6 Alkalinity OH CO3 IICO3 SOd ('I NO3 NO2 P F B Cu Fe Nln Zn 'Ibtal Fecal Point Date (pS/cm) as Ca('O3 as CaCO3 as OH as('03 as 11CO3 as NO3 as NO2 (pg/L) (pg/L) (µg/L) (µg/L) (MIIN/100 mL) 6.5 to Maximum Contaminant Level' 900* 500* 8.5* 250* 250* 45 3 2 1,000* 300* 50* 5,000* 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 - Brown's 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 941 550 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 961 550 7.0 249 65 21 70 2 190 <10 <10 230 186 40 12.8 <0.4 - 0.2 0.9 <10 <30 <10 QO - Brown's New 11/15/2024 965 570 7.9 260 68 22 73 2 190 <10 <10 230 185 40 9.8 <0.3 - 0.2 1.1 <10 <30 <10 <20 - Brown's New 5/14/2025 849 570 &9 269 70 23 77 2 190 <10 <10 240 194 43 10.1 <0.7 - 0.2 1.1 <10 <30 <10 <20 - Brown's New 12/1/2025 955 560 7.3 260 68 22 76 2 190 <10 <10 230 192 42 10.5 <0.7 - 0.2 1.0 <10 <30 <10 <20 - Brown's#1 3/1/1994 960 580 7.5 277 70 25 83 ND 195 ND ND 238 171 41 12.2 ND ND 0.2 1.1 ND ND ND 100 - Brown's#1 6/1/1994 850 500 7.4 330 68 33 94 ND 200 ND ND 240 150 30 12 ND ND ND 1.2 ND ND ND ND - Brown's#1 10/4/1994 900 550 7.5 290 71 26 84 ND 204 ND ND 250 160 42 12 ND N13 0.1 1.1 ND ND ND ND - Brown's#1 1/19/1995 850 540 7.5 290 68 29 72 2 190 ND ND 230 130 68 30 ND ND 0.2 1 ND 400 ND 60 - - Brown's#1 4/26/1995 900 580 8 310 70 32 70 ND 210 ND ND 250 180 43 22 ND ND 0.2 1 - 3,200 30 190 - - Brown's#1 1/11/1996 870 580 7.6 290 67 30 76 ND 260 ND ND 310 170 41 17 ND ND 0.2 1.1 ND 9,300 130 190 - Brown's#1 5/2/1996 880 540 7.3 320 68 36 80 3 220 ND ND 260 190 50 16 ND ND 0.6 1.1 ND 5,800 190 580 - - Brown's#1 1/21/1997 870 560 7.7 311 72 32 73 3 210 ND ND 250 200 45 16 ND 0.5 0.2 1.2 ND 4,900 110 130 - Brown's#1 4/9/1997 880 560 6.6 320 77 32 74 2 210 ND ND 260 190 47 15 ND ND 0.9 1.2 ND 2,700 60 50 - - Brown's#1 7/3/1997 870 690 7.5 320 76 32 78 3 210 ND ND 250 190 43 14 ND ND 0.3 1.2 ND ND ND ND - - Brown's#1 10/16/1997 850 550 7.6 290 68 29 76 6 210 ND ND 260 180 40 13 ND ND 0.4 1.3 ND 740 ND ND - - Brown's#1 1/27/1998 860 530 7.5 290 69 29 69 2 220 ND ND 270 170 40 16 ND 0.5 0.2 1.2 ND 1,500 ND 80 - - Brown's#1 8/4/1998 850 550 7.8 290 68 29 76 3 200 ND ND 250 170 39 15 ND ND 0.2 1.2 ND 410 ND ND - - Brown's#1 11/4/1998 860 510 7.5 300 70 30 74 3 210 ND ND 250 I80 37 12 ND - 0.2 1.1 ND 690 ND ND - - Brown's#1 2/2/1999 900 600 7.5 310 73 31 75 2 210 ND ND 260 180 38 12 ND - 0.2 1.1 ND 1,300 ND ND - - Brown's#1 5/11/1999 890 570 7.4 310 73 31 73 2 230 ND ND 280 190 41 14 ND - 0.2 1.2 ND 11300 ND 80 - - Brown's#1 8/18/1999 %0 630 7.5 313 76 30 80 2 220 ND ND 270 201 42 12.1 ND - 0.3 1.1 ND 340 ND ND - - Brown's#1 2/24/2000 940 600 7.1 307 72 31 77 3 210 ND ND 250 197 48 20.4 ND - 0.2 1.1 ND 630 ND 90 - - Brown's#1 5/16/2000 936 610 7 310 73 31 78 3 210 ND ND 250 195 47 21.4 ND - 0.2 1.1 ND 650 ND ND - - Brown's#1 9/7/2000 916 600 7.3 287 69 28 79 2 210 ND ND 250 195 45 15.6 ND - 0.3 1 ND ND ND ND - - Brown's#1 11/29/2000 931 600 7.2 301 71 30 79 3 210 ND ND 250 191 47 20.1 ND - 0.1 1.17 ND 1,690 20 50 - - Brown's#1 2/21/2001 864 530 6.9 280 66 28 74 3 200 ND ND 240 163 53 27.4 ND - 0.2 1.12 ND 780 20 30 - - Brown's#1 5/23/2001 869 570 7.2 286 70 27 76 3 210 ND ND 250 173 45 16.9 ND - 0.1 1.08 ND ND ND 20 - - Brown's#1 8/28/2001 925 620 7.7 288 71 27 84 3 210 ND ND 260 195 48 19.4 ND - 0.3 1.07 ND 2,010 20 30 - - Browns#1 12/11/2001 873 590 7.5 282 67 28 71 2 200 ND ND 250 159 48 26.5 ND - 0.2 1 ND 490 ND ND - - Brown's#1 3/12/2002 808 510 7.2 268 63 27 67 3 190 ND ND 240 127 55 33.8 ND - 0.1 0.92 ND 200 ND ND - - Brown's#1 6/19/2002 780 510 7.5 238 56 24 66 2 190 ND ND 230 111 53 30.7 ND - 0.2 0.88 ND 310 ND ND - - Brown's#1 8/7/2002 772 490 7.5 245 57 25 64 3 190 ND ND 230 108 46 24.4 ND - 0.2 0.91 ND 480 10 ND - - Brown's#1 10/22/2002 770 500 7.8 248 58 25 66 3 190 ND ND 230 115 48 26.3 ND - 0.2 0.88 ND 240 ND ND - - Brown's#1 1/28/2003 694 410 8 222 51 23 54 3 180 ND ND 220 60 62 38.9 ND - 0.2 0.66 ND 4,650 70 ND - - Brown's#1 4/29/2003 807 530 7.3 261 60 27 69 3 190 ND ND 230 127 55 43 ND - 0.1 0.87 ND 70 ND ND - - Brown's#1 9/13/2003 913 580 7.6 297 68 31 70 3 190 ND ND 230 169 54 39.9 ND - 0.3 I ND 200 ND ND - - Brown's#1 11/19/2003 930 630 7.1 300 69 31 71 3 200 ND ND 240 175 56 23.8 ND - 0.3 0.9 ND 1,800 40 ND - - Brown's#1 2/17/2004 869 560 6.3 293 68 30 68 3 190 <10 <10 230 136 58 46.5 <0.3 - 0.3 1.0 10 1,380 50 80 - - Brown's#1 5/18/2004 804 520 7.1 252 58 26 67 3 180 <10 <10 220 102 60 48.5 <0.3 - 0.3 0.8 <10 2,600 80 QO - - Page 9 of 11