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ToWe Groundwater Monitor njw land Analytical Results • Chevron Service Station##9-3232 8660 Lower Sacramento Road Vertical Measurements are in feet Stockton,California � Analytical results are in arts per billion b Well Ground Depth DATE Head Water To Notes TPH- Benzene Toluene Ethyl- Xylenes MTBE Elev Elev. WO& Galztiline Benzene MW-1 11/04/98 1302 -1891 3193 -- 1100 13 <1 0 43 <1 0 24 03/05/99 13 02 -1848 3150 -- 104 1 69 <0 5 <0 5 0 514 <5 0 06/21/99 13 02 -2003 33 05 -- 70 6 1 29 <0 5 <0 5 <0 5 <5 0 09/13/99 1302 -2558 3860 — 150 4 0 <0 5 082 <0 5 <2 5 12/15/99 13 02 -2162 3464 -- 189 3 91 1 18 2 72 0 81 3 78 12/22/99 1302 -2208 35 10 Gauging only -- -- -- -- -- -- 03/29/00 13 02 -18 11 31 13 -- 170 5 10 <0 5 <0 5 <0 5 <5 0 06/22/00 1302 -2129 3431 -- <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 02 09/26/00 1302 -2621 39 23 — 75 3' <0 500 0 518 <0 500 <0 500 <5 0014 0' MW-2 11/04/98 13 76 -2231 3607 — 120,000 23,000 18,000 4300 15,000 <1000 03/05/99 1376 -1857 3233 — 64,400 15,800 3210 3240 8040 <2000 06/21/99 1376 -1995 33 71 -- 34,200 7340 214 2180 1770 <1000 09/13/99 1376 -2565 3941 51,000 17,000 1400 3300 4200 <250 12/15/99 1376 -22 47 3623 -- 46,100 7660 990 <50 2630 <250 -20 60 34 36 Gauging]2122199 13 76 ging on y -- -- -- -- -- -- 03/29/00 1376 -1799 3175 — 9500 1550 47 1040 I50 <250 06/22/00 1376 -21 19 3495 -- 15,000' 2,600 1,100 1,300 2,300 <50/<2 02 09/26/00 1376 -26 14 3990 — 4,780 986 <10 0 683 <10 0 <1001<2 02 MW-3 11/04/98 12 85 -2237 35 22 -- 18,000 2900 720 1100 2500 <125 03/05/99 1285 -1852 3137 -- 793 23 1 263 12 9 <1 25 186 06/21/99 I2 85 -1707 2992 Inaccessible -- -- -- -- - -- 09/13/99 1285 -2566 3851 -- 100 2 6 <0 5 <0 5 <0 5 2 5 12/15/99 12601 -2162 3422 Inaccessible -- -- -- -- -- -- 9-3232 xls/#386463 1 As of 09/26/00