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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) 'rota) Total Coliform Sampling EC TDS pH Hardness Ca Mg Na 6 Alkaliniq OH CO3 HCO3 SO4 CI NO3 NO2 P F B Co Fe Mn Zn 'rota) Fecal Point Date (pS/cm) as CaCO3 as Ca('O3 as 011 as CO3 as HCO3 as NO3 as NO2 (µg/L) (pg/L) (µg/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* 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 ND 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 1/11/19% 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 5/2/19% 890 540 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 870 680 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 2" 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 950 550 7.9 2" 68 29 76 3 200 ND ND 250 170 39 15 ND ND 0.2 1.2 ND 410 ND ND - Brown's#1 I1/4/1998 860 510 7.5 300 70 30 74 3 210 ND ND 250 190 37 12 ND - 0.2 1.1 ND 6" 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 1,300 ND 80 - Brown's#1 8/18/1999 960 630 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 11/28/2000 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 790 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 - - Brown's#1 12/11/2001 873 5" 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 0.81 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 8/13/2003 913 590 7.6 297 68 31 70 3 190 ND ND 230 169 54 39.9 ND - 0.3 1 ND 200 ND ND - - Browns#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 - - Brown's#1 8/24/2004 814 4" 6.6 279 64 29 68 3 190 <10 <10 230 118 58 42.7 <0.3 - 0.4 0.9 <10 1,000 40 <20 - - Brown's#1 12/2/2004 760 490 7.4 257 65 23 74 2 170 <10 <10 210 99 65 38.8 <0.3 - 0.3 1.0 <10 <50 <10 <20 - - Granite#3 2/22/2006 994 650 7.3 316 82 27 89 2 210 <10 <10 250 226 53 10.6 0.5 - <O.1 1.1 30 5,740 330 40 - - Granite#3 5/31/2006 1,020 680 7.5 336 87 29 90 2 210 <10 <10 260 238 54 10.8 <0.3 - 0.2 1.2 80 4,770 270 20 - - Granite#3 8/21/2006 1,020 680 7.5 309 81 26 87 2 210 <10 <10 250 234 53 10.8 <0.3 - 0.1 1.0 40 4,020 220 30 - - Granite#3 11/14/2006 1,010 700 7.5 332 87 28 93 2 210 <10 <10 250 225 52 10.8 <0.3 - 0.2 1.06 40 3,780 240 20 - - Granite#3 2/13/2007 1,010 710 7.6 318 83 27 92 2 210 <10 <10 260 248 55 10.1 <0.3 - 0.3 0.95 20 6,130 430 <20 - - Page 9 of 11