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Table 2 Groundwater Elevation Analytical Data Chevron Service Station#9-4275 2905 Benjamin Holt Drive Stockton,California Well Groundwater Depth Ethyl- Xylenes Well Date Elevation Elevation to Water TPHg Benzene Toluene benzene (total) MtBE ID Sampled (f;MSL) (ft,MSL) (ft TOC) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) MW-5 09/29/97 -1030 1409 15,000 300 <12 1,500 1,000 <120 (cont) 11/25/97 -1035 1414 8,300 290 <50 770 450 <250 03/26/98 -406 785 <50 <0 5 <0 5 <05 <05 <2 5 06/24/98 -577 956 <50 <0 5 <0 5 0 64 <0 5 100 09/10/98 -779 11 58 100 3 6 1 5 10 58 47 i 12/17/98 -761 11 40 52 12 <05 39 23 680 03/10/99 -590 969 <50 <0 5 <0 5 061 <0 5 19 06/22/99 -636 1015 <50 <05 <0 5 <0 5 <0 5 <20 09/13/99 -902 1281 1,900 20 34 130 85 32 12/16/99 -890 1269 2040 871 485 137 996 108 03/01/00 -416 7 95 906 <0 5 <0 5 <0 5 147 415 06/13/00 -640 1019 <50 0 <0 500 <0 500 <0 500 <0 500 <5 00 09/13/00 -845 1224 <50 0 <0 500 <0 500 <0 500 <0 500 <5 00 12!14100 -801 11 80 <50 0 <0 500 <0 500 <0 500 <1 50 600 03/02/01 (S) -654 1033 <50 <0 50 <0 50 <0 50 <0 50 4 7/7 5y 03/02/01y (K) -654 1033 <50 <0 50 <0 50 <0 50 <0 50 61 05/10/01 -570 949 <50 <0 50 0 54 055 0 63 0 8 08121/01 -858 1237 620 <0 50 <050 095 <0 50 <0 50 12/05/01 -832 1211 640 <0 5 <05 <05 05 <0 5 03/11/02 607 9 86 <50 <0 5 <05 <0 5 <0 5 0 6 06/07/02 -692 1071 <50 <0 5 <0 5 <0 5 <0 5 <0 5 09/24/02 -902 1281 130 <0 5 <0 5 4 1 <2 12/17/02 -851 1230 <50 <0 5 <0 5 09 <0 5 <2 MW-6 03/11/92 1 43 -1556 1699 -- -- -- -- - -- 03/17/92 -1552 1695 3,900 63 23 370 57 06/29/92 -1705 1848 750 4 0 30 49 ND - 12/10/92 -1765 1908 700 ND 32 34 0 6 02/04/93 -1556 1699 620 ND 1 7 0 3 ND 05/18/93 -1375 1518 760 ND 37 1 5 60 08/05/93 -1462 1605 1,300 ND 77 39 1 6 - 11/09/93 -1516 1659 630 35 1 4 ND 0 8 - 01/18/94 -1482 1625 470 61 28 14 0 8 06/27/94 -1413 1556 320 3 5 1 1 16 3 5 09/29/94 -1527 1670 780 80 2 5 49 55 12/08/94 1492 1635 430 32 34 3 9 1 5 - 1 Chevron194275QMR19 4275 NF