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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 Cs Mg Na K Alkalinity OR CO3 HCO3 SO4 Cl NO3 NO2 P F B Cu Fe Mn Zn Total Fecal Point Date (US/cm) as CaCO3 as CsCO3 as OR as CO3 as HCO3 as NO3 as NO2 (Ug/L) (Ug/L) (pg/L) (pg/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* Hall 11/15/2022 760 470 7.5 215 58 17 73 2 180 <10 <10 220 77.9 81 9.4 <0.7 - 0.2 0.4 <10 <30 <10 <20 <1.1 <1.1 Faulkner 6/1/1994 1,000 680 7.8 360 93 31 97 ND 230 ND ND 280 75 32 25 ND ND ND 0.5 ND 60 ND 70 Absent - Faulkner 10/4/1994 1,100 620 7.5 320 86 26 100 ND 240 ND ND 300 66 120 36 ND ND ND 0.5 ND ND ND ND Present'Absent' Faulkner 1/19/1995 1,000 600 7.4 310 80 25 92 ND 230 ND ND 280 72 130 30 ND ND 0.1 0.5 ND ND ND ND Absent - Faulkner 4/26/1995 1,000 600 7.6 290 79 23 87 ND 220 ND ND 270 74 140 25 ND ND ND 0.4 ND ND ND ND Absent - Faulkner 7/6/1995 980 600 7.5 280 72 23 88 ND 230 ND ND 280 66 140 24 ND ND ND 0.5 ND ND ND ND Absent - Faulkner 11/11/1995 1,000 600 Z7 310 83 25 92 ND 270 ND ND 320 75 135 29 ND ND ND 0.4 ND ND ND ND Absent - Faulkner 1/11/1996 1,000 630 7.4 300 83 23 89 ND 280 ND ND 350 64 140 30 ND ND 0.3 0.4 ND ND ND ND Absent - Faulkner' 5/2/1996 990 580 7.4 320 82 29 91 2 230 ND ND 270 80 140 26 ND ND 0.6 0.4 ND 30 ND ND Absent - Faulkner 7/10/1996 990 610 7.5 310 82 26 80 ND 230 ND ND 280 82 140 27 ND ND 0.3 0.4 ND ND ND ND Absent - Faulkner 10/16/1996 1,000 620 7.3 330 89 26 93 2 240 ND ND 290 75 140 30 ND ND ND ND ND ND ND ND Absent - Faulkner 1/21/1997 1,000 610 7.6 315 85 25 82 2 220 ND ND 270 75 140 29 ND ND 0.1 0.4 ND ND ND ND Absent - Faulkner 4/9/1997 980 590 5.8 330 89 26 88 2 230 ND ND 280 76 140 29 ND ND 0.6 4 ND ND ND ND Absent - Faulkner 7/3/1997 950 620 7.4 320 88 25 84 2 220 ND ND 270 77 120 24 ND ND 0.2 0.4 ND ND ND ND Absent - Faulkner 10/16/1997 980 610 7.5 300 82 23 85 3 210 ND ND 260 79 130 24 ND ND 0.3 0.4 ND ND ND ND Absent - Faulkner 1/27/1998 960 760 7.5 300 82 23 77 2 230 ND ND 280 76 120 22 ND ND 0.2 0.4 ND ND ND ND Absent - Faulkner 5/5/1998 910 550 7.7 290 79 23 80 2 240 ND ND 290 87 93 18 ND ND 0.1 0.4 ND ND ND ND Absent - Faulkner 8/4/1998 920 550 7.5 290 80 23 84 2 240 ND ND 290 93 93 16 ND ND 0.1 0.5 ND ND ND ND Absent - Faulkner 11/4/1998 920 520 7.4 300 81 23 80 2 240 ND ND 290 76 100 13 ND - 0.1 0.3 ND ND ND ND Absent - Faulkner 2/2/1999 940 580 7.4 300 84 23 80 2 240 ND ND 300 74 96 15 ND - 0.2 0.4 ND ND ND ND Absent - Faulkner 5/11/1999 950 580 7 310 85 23 85 2 260 ND ND 320 86 100 20 ND - 0.2 0.4 ND ND ND ND Absent - Faulkner 8/18/1999 974 580 7.4 307 85 23 83 1 260 ND ND 320 78 99 20.1 ND - 0.1 0.4 ND ND ND ND Absent - Faulkner 11/17/1999 966 580 7.6 319 90 23 78 2 260 ND ND 310 81 101 19.5 ND - 0.2 0.5 ND 60 ND ND Absent - Faulkner 2/24/2000 1,000 630 6.9 313 86 24 88 2 240 ND ND 300 83 115 24.5 ND - 0.2 0.5 ND 120 ND 80 Absent - Faulkner 5/16/2000 987 600 6.8 302 83 23 86 2 250 ND ND 300 81 106 20.8 ND - 0.2 0.4 ND 80 ND 60 Absent - Faulkner 9/7/2000 963 570 7.3 280 76 22 86 2 240 ND ND 290 80 106 19.6 ND - 0.2 0.4 ND 70 ND 50 .Absent - Faulkner 11/28/2000 977 480 6.8 283 77 22 82 2 240 ND ND 300 77 97 18.4 ND - ND 0.46 ND ND ND 60 Absent - Faulkner 2/21/2001 961 570 6.9 288 79 22 84 2 250 ND ND 310 82 102 18.9 ND - ND 0.46 ND ND ND 70 Absent - Faulkner 5/23/2001 956 570 7 299 82 23 84 2 260 ND ND 310 81 94 17.6 ND - ND 0.44 ND 100 ND 120 Absent - Faulkner 8/28/2001 945 590 7.7 276 76 21 81 2 260 ND ND 320 81 95 15.9 ND - 0.2 0.42 ND 70 ND 80 Absent - Faulkner 12/11/2001 934 580 7.3 290 80 22 78 2 250 ND ND 310 73 92 13.6 ND - ND 0.42 ND 150 ND 220 Absent - Faulkner 3/12/2002 948 580 7.2 303 82 24 79 2 250 ND ND 310 88 100 13.3 ND - ND 0.43 ND 60 ND 110 Absent - Faulkner 6/19/2002 966 610 7.4 292 79 23 80 2 270 ND ND 320 72 99 14.5 ND - 0.1 0.42 ND ND ND 140 Absent - Faulkner 8/7/2002 975 600 7.3 297 81 23 81 2 260 ND ND 320 70 102 14.9 ND - 0.1 0.4 ND ND ND 140 Absent - Faulkner 10/22/2002 961 610 7.7 308 84 24 82 2 260 ND ND 310 82 100 17.7 ND - 0.2 0.45 ND 80 ND 170 Absent - Faulkner 1/28/2003 988 610 7.9 313 86 24 84 2 260 ND ND 310 92 106 18.9 ND - ND 0.45 ND 160 ND 160 Absent - Faulkner 4/29/2003 974 600 7.3 311 85 24 88 2 260 ND ND 310 92 104 18.5 ND - ND 0.46 ND 160 ND 150 Absent - Faulkner 8/13/2003 978 590 7.4 297 81 23 80 2 240 ND ND 300 90 106 17.6 ND - 0.3 0.44 ND ND ND ND 3.6 Absent Faulkner 11/19/2003 971 610 6.9 292 79 23 80 2 240 ND ND 290 90 106 11.3 ND - 0.2 0.4 ND ND ND ND Absent - Faulkner 2/17/2004 982 590 7.0 302 83 23 82 2 240 <10 <10 290 91 107 16.0 <0.3 - 0.1 0.4 <10 <50 <10 <20 <1.1 - Faulkner 5/18/2004 994 590 6.7 311 85 24 84 2 240 <10 <10 290 94 107 15.2 <0.3 - 0.2 0.4 <10 <50 <10 <20 <I.I - Faulkner 8/24/2004 994 590 7.0 325 89 25 86 2 240 <10 <10 290 96 108 15.5 <0.3 - 0.2 0.4 <10 <50 <10 <20 <1.1 - Page 3 of 10