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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 Tmal Coliform Sampling EC TDS pH Hardness Ca Mg Na K AlkalinaN UII CO3 HCO3 SO4 Cl NO3 NO2 1, F B Cu 1e .Vln Zn Total Fecal Point Date (Its/cm) as CaCO3 as CaCO3 :is Oil as CO3 as HCO3 as NO3 as S02 (µg/L) (µg/L) (µg/1,) (µg/L) (MPN/100 mL) 6.5 to Maximum Contaminant Level' 900* 500* 8.5* 250* 250* 45 - 1,000* 300* 50* 5,000* Granite#3 8/14/2007 994 660 7.0 330 86 28 98 3 210 <10 <10 260 229 52 10.7 <0.3 - 0.2 1.14 <10 1,570 70 30 - - Granite#3 5/1/2008 996 670 7.6 316 82 27 92 2 200 <10 <10 240 224 49 11.1 <0.3 - 0.3 1.1 <10 80 <10 140 - - Granite#3 8/26/2008 1,030 720 7.1 331 85 29 96 2 200 <10 <10 250 233 53 12.1 <0.3 - 0.1 1.2 <10 660 30 150 - Granite#3 11/25/2008 1,020 630 7.9 320 82 28 92 2 200 <10 <10 250 237 55 11.9 <0.3 - <0.1 1.2 <10 1,880 70 100 - Granite#3 2/10/2009 1,020 680 7.9 329 84 29 91 2 200 <10 <10 250 230 54 13.0 <0.3 - 0.1 1.1 <10 1,320 60 50 - - Granite#3 5/5/2009 1,030 660 8.3 341 87 30 92 2 200 <10 <10 250 237 57 13.3 <0.3 - 0.2 1.1 <10 3,890 90 90 - - Granite#3 11/23/2009 1,010 640 7.8 325 84 28 91 2 200 <10 <10 240 235 56 13.7 <0.3 - 0.2 1.1 <10 470 40 70 - - Granite#3 5/25/2010 980 640 7.3 321 84 27 92 2 200 <10 <10 240 218 52 13.2 <0.3 - 0.2 1.0 <10 70 <10 <20 - - Granite#3 11/30/2010 970 660 7.2 323 85 27 87 2 190 <10 <10 240 211 51 13.4 <0.3 - 0.2 1.1 <10 <50 <10 180 - - Granite#3 5/23/2011 877 570 6.9 291 77 24 79 2 180 <10 <10 220 191 45 16.5 <0.3 - 0.2 0.9 <10 2,110 40 220 - - Granite#3 11/17/2011 939 570 7.8 317 84 26 95 2 190 <10 <10 240 201 50 15.6 <0.3 - 0.1 1.1 20 100 <10 180 - - Granite#3 5/31/2012 983 620 7.6 321 84 27 93 2 190 <10 <10 230 212 53 13.7 <0.3 - 0.1 1.1 <10 <50 <10 40 - - Granite#3 11/20/2012 959 630 7.6 328 87 27 86 2 190 <10 <10 240 205 51 14.2 <0.3 - 0.2 1.1 <10 <50 <10 40 - - Granite#3 5/20/2013 960 630 7.5 316 82 27 92 2 200 <10 <10 240 211 51 13.1 <0.3 - 0.1 1.1 <10 <50 <10 40 - Granite#3 11/19/2013 869 550 7.8 243 58 24 71 3 180 <10 <10 220 198 47 6.5 <0.3 - 0.1 1.0 80 13,600 220 50 - - Granite#3 5/14/2014 914 650 7.7 307 80 26 83 2 180 <10 <10 220 205 52 13.3 <0.3 - <0.1 1.1 <10 280 <10 <20 - Granite#3 11/12/2014 1,000 620 7.4 320 82 28 83 2 170 <10 <10 210 219 53 15.3 <0.3 - <0.1 1.0 200 1,190 30 20 - Granite#3 5/26/2015 967 640 7.5 302 80 25 88 2 190 <10 <10 240 208 52 12.6 <0.7 - 0.2 1.0 60 200 <10 30 - - Granite#3 11/17/2015 978 650 7.2 309 81 26 80 1 200 <10 <10 240 215 51 14.0 <0.7 - 0.2 0.9 10 130 <10 110 - - Granite#3 this well was off,no sample could be obtained Granite#3 11/8/2016 950 590 7.8 304 79 26 86 2 200 <10 <10 240 206 51 13.5 <0.7 - 0.2 1.1 20 190 <10 <20 - - Granite#3 5/23/2017 954 650 7.4 302 80 25 83 2 190 <10 <10 240 207 52 13.5 <0.7 - 0.2 1.1 20 120 <10 <20 - - Granite#3 11/20/2017 903 590 8.5 297 78 25 83 2 190 <10 <10 230 194 47 15.0 <0.7 - 0.2 1.0 30 480 20 1,270 - - Granite#3 5/21/2018 %8 630 6.3 297 76 26 82 4 200 <10 <10 240 209 51 13.1 <0.7 - 0.2 1.1 10 30 <to 90 - - Granite#3 11/14/2018 this well was off,no sample could be obtained Granite#4 8/4/2009 %5 620 7.9 297 78 25 90 2 200 <10 <10 240 211 48 12.1 <0.3 - 0.2 1.1 20 410 10 <20 - - Granite#4 11/15/2022 914 620 7.2 297 78 25 78 2 200 <10 <10 240 216 49 11.6 <0.7 - 0.2 1.0 <10 <30 <10 <20 - - Granite#4 11/15/2023 933 630 7.3 285 73 25 84 2 200 <10 <10 250 216 49 12.2 <0.3 - 0.2 1.1 10 40 <10 <20 - - Granite#5 5/15/2019 960 5" 7.4 297 81 23 81 2 190 <10 <10 230 198 46 11.1 <0.2 - 0.2 1.1 <10 60 <10 <0 - - Granite#5 12/3/2019 this well was off,no sample could be obtained Granite#5 5/1/2020 976 630 7.4 290 75 25 84 2 200 <10 <10 240 201 47 11.9 <0.7 - 0.2 1.1 <10 90 <10 <20 - - Granite#5 11/24/2020 874 560 8.1 259 67 22 73 2 190 <10 <10 230 158 43 13.7 <0.7 - 0.2 1.0 1,010 10,600 80 60 - - Granite#5 5/19/2021 931 630 7.8 299 77 26 85 2 200 <10 <10 240 204 49 11.6 <0.7 - 0.2 1.1 <10 <30 <10 <20 - - Granite#5 11/22/2021 no well purr p,no sample could be obtained Granite#5 5/25/2022 992 630 7.7 267 69 23 78 _ 200 <10 <10 240 207 48 11.5 <0.3 - 0.2 1.1 <10 80 <10 <20 - - Granite#5 11/15/2022 no well purr 1),no sample could be obtained Granite#5 5/16/2023 861 570 7.8 272 71 23 77 2 190 <10 <10 240 178 47 14.5 <0.3 - 0.2 1.0 <10 120 10 <20 - - Granite#5 5/21/2024 927 630 7.0 278 72 24 79 2 200 <10 <10 240 201 48 11.5 <0.1 - 0.2 1.0 <10 30 <10 <20 - - Granite#5 11/15/2024 936 590 8.0 290 75 25 82 2 200 <10 <10 240 216 51 10.8 <0.1 - 0.2 1.1 <10 <30 <10 QO - - Koster 6/1/1994 800 490 7.7 240 61 23 94 ND 150 ND ND 180 96 70 31 ND ND 0.2 1.1 ND 470 5o ND - - Koster 10/4/1994 890 500 7.7 230 62 19 87 ND 151 ND ND 194 110 70 35 ND ND 0.2 1 ND ND ND ND - - Page 10 of I 1