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• • • Table 2 Groundwater Elevation and Analytical Data(ARCO) ARCO Service Station#2133 2908 West Benjamin Holt Drive Stockton Caldomia Well Depth Groundwater Ethyl- Total Well Date Elevation to Water Elevation TPHg " Benzene Toluene benzene Xylenes MtBE,. DO IQ bampled Notes (tt,MSL) (tt,TOG) (tt,MbL) (Ng1L) (1,91L) (N91L) (Ng1L) (Pg1L) '(p§h-)- (MglL) E4 07/12/90 1825 -1592 -- — — — -- — _ (cont) 08/16/90 1855 -1622 — — — -- -- — — 09/17/90 1890 -1657 — — -- — — 09/19/90 1890 -1657 4 400 33 37 160 430 — — 10/11/90 1898 -1665 -- — — — -- 12/06/90 1882 -1649 -- — — — -- 02/12/91 1848 -1615 3,200 750 9 73 270 - — 02/25/91 18 43 -1610 -- — — — -- 04/23/91 1762 -1529 07/16/91 2030 -1797 10/08/91 2090 -1857 — — -- — — — 01/22/92 1901 -1668 8,500 1,100 140 10 220 — - 04/22/92 1805 -1572 6,300 730 12 110 200 — — 07129/92 1963 -1730 7,700 1,000 14 130 310 -- — 10/29192 1999 -1766 5,600 1 300 16 130 180 -- — 01/27/93 1672 -1439 10 000 470 26 130 270 — — 04/29193 1494 -1261 14,000 1 300 22 280 520 — — 08/05/93 1663 -1430 9,400 900 <20 160 240 — — 11/10/93 1692 -1459 4,400 290 <20 67 130 — — 03/21194 16 39 -1406 5,400 340 24 110 220 — — 06/27/94 1614 -1381 7 800 790 11 170 470 — — 09/29/94 1706 -1473 1 600 130 <0 5 33 41 -- — 12/08/94 1665 -1432 5200 940 88 170 380 -- — 03/08/95 14 19 Al 86 7,900 490 56 130 190 — -- 06/01/95 1274 -1041 15 000 1 000 10 360 380 — -- 09/11/95 1496 -1263 10 000 1 000 <10 350 320 -- -- 12l05195 1523 -1290 — — — — — — - 03/18/96 1010 -777 4,700 530 35 250 350 — — 06/18/96 11 03 -870 — — — — — — — 09/25/96 1347 -11 14 7,600 890 <10 360 190 <5 — 12/04/95 1294 -1061 — -- -- -- _ _ — 03/19/97 NP 743 -510 1,600 120 84 38 <5 -- 02 06/05/97 1008 -775 — — — — — — 01 08/19/97 NP 11 57 -924 1 800 83 78 63 76 110 01 11/25/97 P 11 27 -894 — — — — — -- -- 03/19/98 NP 547 -3 14 110 36 <0 50 <0 50 <0 50 14 36 06/24/98 753 -520 — — — — -- — — 09110/98 NP 920 -687 1 972 335 <0 50 <0 50 <0 50 815 — 2133—QMR-Tables 2&4&5 Page 6 of 41 SECOR