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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 I-Iardness Ca Mg Na 6 Alkalinity ()It CO3 HCO3 SO4 Cl NO3 NO2 P F B Cu Fe NIn %n Total Fecal Point Date (IIS/CM) as CaCO3 as CAW as OH as('03 as HCO3 as 503 as NO2 (pg/l.) (pg/1,) (pg/L) (pg/l,) (MPN/100 mL) 6.5 to Maximum Contaminant Level 900* 500* 8.5• 250* 250* 45 2 1,000* 300* 50* 5,000* - Hall 5/11/2005 990 600 7.4 318 88 24 83 2 240 <10 <10 290 100 109 14.8 <0.3 - 0.2 0.4 <10 <50 <10 QO <1.1 Hall 8/30/2005 956 600 7.4 266 72 21 85 2 180 <10 <10 220 65 147 18.2 <O.3 - 0.2 0.4 <10 <50 <10 QO <1.1 Hall 11/15/2005 949 590 7.4 270 72 22 82 2 200 <10 <10 240 63 127 18.4 1.7 - 0.2 0.5 <10 <50 <10 <20 <1 Hall 2/15/2006 946 540 7.4 278 75 22 91 2 220 <10 <10 260 63 120 18.2 1.6 - 0.2 0.5 <10 <50 <10 <20 <1.1 Hall 5/31/2006 985 560 7.6 292 79 23 89 2 220 <10 <10 260 68 140 19.2 <0.3 - 0.2 0.5 <10 <50 <10 QO <1.1 Hall 8/21/2006 992 630 7.5 274 75 21 86 2 220 <10 <10 260 67 137 19.0 <O.3 - 0.2 0.4 <10 <50 <10 <20 <1.1 - Hall 11/14/2006 979 590 7.5 289 78 23 92 2 220 <10 <10 270 64 130 19.3 <0.3 - 0.2 0.40 <10 <50 <10 <20 <1.1 - Hall 2/13/2007 972 600 7.6 275 74 22 90 2 220 <10 <10 260 68 137 17.6 <O.3 - 0.3 0.34 <10 <50 <10 <20 <1.1 Hall 5/29/2007 967 600 7.5 252 68 20 86 2 210 <10 <10 260 67 132 19.1 <0.3 - <O.1 0.39 <10 70 <10 <20 <1.1 Hall 8/14/2007 957 550 6.7 283 77 22 94 2 210 <10 <10 250 68 129 18.6 <0.3 - 0.2 0.49 <10 <50 <10 <20 <1.1 Hall 11/26/2007 955 590 7.8 283 77 22 84 2 210 <10 <10 260 68 132 18.6 <O.3 - 0.2 0.4 <10 <50 <10 <20 <1.1 Hall 2/4/2008 952 550 7.8 278 75 22 89 2 210 <10 <10 260 70 134 19.2 <O.3 - 0.1 0.4 <10 <50 <10 <20 <1.1 <1.1 Hall 5/1/2008 932 550 7.3 269 73 21 86 2 210 <10 <10 260 71 121 17.2 <O.3 - 0.2 0.4 <10 <50 <10 QO <1.1 <1.1 Hall 8/26/2008 865 560 6.9 268 71 22 88 2 210 <10 <10 250 77 119 19.1 <O.3 - 0.2 0.5 <10 <50 <10 <20 1.1 <1.1 Hall 11/25/2008 958 530 8.1 270 72 22 87 2 200 <10 <10 250 74 125 19.2 <O.3 - 0.2 0.5 <10 <50 <10 <20 <1.1 <I.1 Hall 2/10/2009 954 550 8.1 264 71 21 86 2 200 <10 <10 250 73 125 19.3 <O.3 - 0.2 0.5 <10 <50 <10 QO <1.1 <1.1 Hall 5/5/2009 934 570 6.9 269 73 21 87 2 200 <10 <10 250 74 118 19.7 <0.3 - 0.2 0.5 <10 <50 <10 <20 <1.1 <1.1 Hall 8/4/2009 922 530 7.9 262 72 20 87 2 200 <10 <10 250 76 118 18.5 <O.3 - 0.2 0.5 <10 <50 <10 <20 <1.1 <1.1 Hall 11/23/2009 923 510 8.0 266 72 21 88 2 200 <10 <10 250 76 118 19.4 <0.3 - 0.2 0.5 <10 <50 <10 <20 <1.1 <1.1 Hall 5/25/2010 921 530 7.4 271 74 21 89 2 200 <10 <10 240 74 120 20.9 <0.3 - 0.1 0.4 <10 <50 <10 QO <1.1 <1.1 Hall 11/30/2010 890 540 7.4 269 73 21 84 2 190 <10 <10 230 73 (06 16.9 <0.3 - 0.2 0.4 <10 <50 <10 30 <1.1 <1.1 Hall 5/23/2011 877 510 7.7 255 71 19 81 2 190 <10 <10 230 76 106 15.8 <O.3 - 0.2 0.4 <10 50 <10 QO <1.1 <1.1 Hall 11/17/2011 878 480 7.9 262 72 20 92 2 200 <10 <10 240 81 98 12.7 <0.3 - 0.2 0.5 <10 <50 <10 QO <1.1 <1.1 Hall 5/31/2012 879 530 7.4 254 69 20 86 2 190 <10 <10 230 77 99 12.6 <O.3 - 0.2 0.4 <10 <50 <10 QO - - Hall 11/20/2012 882 520 7.4 274 75 21 81 2 200 <10 <10 250 83 93 11.5 <O.3 - 0.2 0.4 <10 <50 <10 QO <1.1 <1.1 Hall 5/20/2013 860 510 7.3 254 69 20 85 2 200 <10 <10 250 83 92 11.1 <0.3 - 0.3 0.4 <10 <50 <10 QO <1.1 <1.1 Hall 11/18/2013 889 530 7.6 264 71 21 68 2 200 <10 <10 250 91 106 14.5 <0.3 - <O.1 0.5 20 <50 <10 QO <1.1 <1.1 Hall 5/14/2014 853 560 7.5 257 70 20 77 2 200 <10 <10 240 82.5 97 14.0 <0.3 - <O.1 0.4 <10 100 <10 QO <1.1 <1.1 Hall 11/12/2014 1040 590 7.9 301 81 24 88 2 210 <10 <10 260 87 133 34.2 <0.3 - 0.2 0.5 <10 50 <10 QO <1.1 <1.1 Hall 5/26/2015 1010 610 7.7 293 81 22 88 2 210 <10 <10 250 81 128 30.6 <0.7 - 0.2 0.4 <10 <30 <10 QO <1.1 <1.1 Hall 11/17/2015 987 580 7.2 274 75 21 82 1 200 <10 <10 250 76 122 27.1 <0.7 - 0.2 0.5 <10 <30 <10 QO <1.1 <1.1 Hall 5/24/2016 937 520 7.6 264 71 21 84 2 190 <10 <10 240 81 108 21.2 <0.7 - 0.3 0.5 <10 <30 <10 QO <1.1 <1.1 Hall 11/8/2016 970 570 7.2 280 76 22 91 2 160 <10 <10 190 82.2 129 31.7 <0.7 - 0.2 0.5 <10 <30 <10 QO <1.1 <1.1 Hall 5/23/2017 903 540 7.4 245 67 19 83 2 190 <10 <10 230 83.4 108 20.8 <0.7 - 0.2 0.5 <10 <30 <10 QO <1.1 <1.1 Hall 11/20/2017 888 550 7.6 266 72 21 89 2 190 <10 <10 230 84.9 113 20.2 <0.7 - 0.2 0.5 <10 DO <10 QO <1.1 <1.1 Hall 5/21/2018 878 550 6.6 233 62 19 78 3 190 <10 <10 230 83.8 108 18.0 <0.7 - 0.2 0.5 <10 <30 <10 QO <1.1 <1.1 Hall 11/14/2018 923 580 7.9 273 73 22 80 2 180 <10 <10 220 82.3 118 17.8 <0.7 - 0.2 0.4 <10 40 <10 QO <1.1 <1.1 Hall 5/14/2019 915 520 6.6 235 63 19 80 2 180 <10 <10 220 80.6 107 16.7 <0.7 - 0.2 0.5 <10 <30 <10 QO <1.1 <1.1 Hall 11/26/2019 916 530 7.8 210 56 17 69 2 180 <10 <10 220 83.9 100 14.4 <0.7 - 0.2 0.4 <10 <30 <10 QO <1.1 <1.1 Hall 5/20/2020 780 450 7.6 215 58 17 71 2 180 <10 <10 220 78.6 70 6.0 <0.7 - 0.2 0.4 <10 260 <10 120 <1.1 <1.1 Hall 11/24/2020 840 480 8.1 212 57 17 71 2 ISO <10 <10 220 80.6 87 10.0 <0.7 - 0.2 0.4 <10 <30 <10 QO <1.1 <1.1 Hall 5/19/2021 786 470 8.2 207 55 17 71 2 ISO <10 <10 220 82.8 84 9.1 <0.7 - 0.2 0.4 <10 <30 <10 QO <1.1 <1.1 Hall 11/22/2021 771 460 7.8 198 53 16 69 2 180 <10 <10 210 81.0 78 9.0 <0.7 - 0.2 0.4 <10 <10 <10 QO <1.1 <1.1 Hall 5/25/2022 824 470 7.7 205 54 17 72 1 ISO <10 <10 220 79.5 80 9.5 <0.3 - 0.2 0.4 <10 <30 <10 QO <1.1 <1.1 Page 2 of 10