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• 0 Table 2 Groundwater Elevation and Analytical Data(ARCO) ARCO Service Station#2133 2908 West Benjamin Holt Drive Stockton California Well Depth -Groundwater Ethyl- Total t Well Date Elevation to Water' Elevatron TPlig Benzene Toluene a benzene_ Xylenes MtBE DO 10 Sampled Notes (tt,MSL) (tt,TOG)` (tt,MSL) (Ug/L) (N9/L) (N9/L) (pg1L), (pg/L)' JpglL) (mg1L) E-3 10/08/91 dry (cont) 01/22/91 dry — 04/22/92 dry _ 07/29/92 dry _ 10/29/92 dry _ — — _ — — 01/27/93 1669 -1440 57 000 2,700 180 660 1900 -- — 04/29/93 1493 -1264 32,000 3,400 140 930 2,500 -- — 08/05/93 1670 -1441 27 000 1,800 69 670 1 400 — — 11/10/93 1714 -1485 47,000 1,700 <50 740 2,000 — - 03121/94 1660 -1431 24,000 1 500 86 620 1,500 -- — 06/27/94 1625 -1396 19 000 1 500 36 670 1 400 — — 09/29/94 1704 -1475 24,000 1,600 77 630 1,300 — 12/08/94 1668 -1439 21,000 2,700 58 890 1900 -- — 03/08195 1420 -1191 94 000 1,600 130 640 2,600 — — 06/01/95 1268 -1039 58,000 1900 24 590 2,500 — — 09/11/95 1501 -1272 29,000 1900 <50 640 1 900 — 12/05/95 1522 -1293 -- -- — — _ 03/18196 1040 -811 15 000 480 12 390 660 — — 05/18/96 11 05 -876 -- — — -- _ 09/25/96 1352 -1123 7 600 160 <5 160 300 <50 — 12/04/96 1293 -1064 — -- — — — _ _ 03/19/97 P 837 -608 4,400 46 6 46 99 — 02 06/05/97 P 1006 -777 — — — — — _ 02 08/19/97 P 11 53 -924 3 900 50 10 41 28 <50 01 11/25/97 P 1170 -941 — — — — — — _ 03/20/98 P 540 -311 <50 <0 50 <0 50 <0 50 <0 50 <50 20 06/24/98 742 -513 — — — — — _ _ 09/10/98 P 919 -690 1,440 146 391 127 531 651 12/17/98 928 -699 — — — -- — _ 03/10/99 P 701 -472 900 454 168 763 245 <5 0 33 06/22/99 877 -648 -- — — — -- — 36 09/13/99 P 1078 -849 481 185 <0 50 244 0 635 <50 18 12/15/99 10 64 -835 — -- — — — -- 84 03/23/00 P 595 -366 689 609 0 987 536 305 <2 50 15 06/21/00 820 -591 — -- — — -- — 03 09/13/00 P 998 -769 977 416 0 882 542 150 336 137 12/15/00 946 -717 — -- — — -- — 147 03102/01 P 739 -510 600 252 177 258 401 303 25 2133—QMR-Tables 2&4&5 Page 4 of 41 SECOR