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TABLE 1 <br />HISTORICAL GROUNDWATER DATA - MONITORING WELLS <br />RANCH MARKET <br />23569 S. SANTA FE ROAD, RIVERBANK, CA <br />Page 2 of 10 <br />Well ID Date <br />Depth to <br />Water <br />Water <br />Elevation TPH-G Benzene Toluene <br />Ethyl <br />benzene <br />Total <br />Xylenes MTBE <br />TOC (feet) (feet MSL)(µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) <br />MW-2 12/09/98 25.90 79.42 45,800 4,730 5,470 561 3,300 350 <br />105.32 12/25/99 27.19 78.13 19,800 3,840 2,930 230 1210 300 <br />04/06/00 25.42 79.90 42,000 8,100 5,400 680 4,100 850 <br />08/16/00 27.31 78.01 37,000 8,500 4,700 730 2,900 750 <br />09/01/00 <br />11/16/00 26.80 78.52 4,700 1500 330 22 320 100 <br />01/03/01 26.84 78.48 3,800 1300 360 29 250 110 <br />04/11/01 26.40 78.92 17,000 5,400 1,200 280 1,100 340 <br />07/03/01 27.63 77.69 29,000 6,800 2,200 800 2,300 580 <br />10/01/01 28.02 77.30 6,900 1,400 1,000 150 500 76 <br />01/03/02 26.79 78.53 5,500 1,000 840 72 550 35 <br />04/05/02 26.98 78.34 10,000 3,400 930 110 710 240 <br />07/12/02 28.23 77.09 17,000 3,600 1,500 240 1,100 290 <br />10/01/02 28.64 76.68 5,700 950 720 96 480 53 <br />105.33 01/10/03 24.43 80.90 600 220 3.8 9.2 20 95 <br />04/01/03 27.53 77.80 990 160 <0.5 0.90 4.9 180 <br />07/02/03 27.83 77.50 2,800 460 <5.0 37 81 170 <br />10/02/03 29.02 76.31 180 91 <0.5 14 1.2 12 <br />01/09/04 28.09 77.24 250 2.5 22 1.8 36 5.5 <br />04/08/04 27.79 77.54 52 <0.5 <0.5 <0.5 <0.5 13 <br />07/01/04 28.42 76.91 <50 <0.5 <0.5 <0.5 <0.5 8.0 <br />10/13/04 29.21 76.12 <50 <0.5 <0.5 <0.5 <1.0 <0.5 <br />01/05/05 28.53 76.80 <50 <0.5 <0.5 <0.5 <1.0 <0.5 <br />04/06/05 28.00 77.33 <50 <0.5 <0.5 <0.5 <1.5 0.78 <br />07/13/05 28.86 76.47 <50 <0.5 <0.5 <0.5 <1.5 2.1 <br />10/12/05 28.94 76.39 72 <0.5 <0.5 <0.5 <1.5 1.5 <br />01/11/06 25.68 79.65 73 <0.5 <0.5 <0.5 <1.5 <0.5 <br />03/15/06 25.41 79.92 <br />06/08/06 24.78 80.55 2,600 <0.5 4.8 16 280 3.2 <br />08/23/06 27.35 77.98 160 <0.5 <0.5 <0.5 0.77 1.8 <br />12/14/06 27.64 77.69 <50 <0.5 <0.5 <0.5 <1.0 <0.5 <br />03/26/07 27.30 78.03 84 <0.5 <0.5 <0.5 <1.0 0.78 <br />06/19/07 28.59 76.74 <50 <0.5 <0.5 <0.5 <1.0 <0.5 <br />02/11/08 28.24 77.09 <50 <0.5 <0.5 <0.5 <1.0 <0.5 <br />09/19/08 Inaccessible <br />05/10/13 Inaccessible <br />12/04/14 Inaccessible <br />05/14/15 Inaccessible <br />01/12/16 32.95 72.38 91 <0.50 <0.50 1.3 8.5 <0.50 <br />11/02/16 Well buried; inaccessible <br />03/09/17 Well buried; inaccessible <br />09/29/17 Well buried; inaccessible <br />01/31/18 Well buried; inaccessible <br />08/12/18 Well buried; inaccessible <br />12/30/19 31.53 73.80 <50 <0.50 <0.50 <0.50 <1.0 <0.50