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R TabjOL • Groundwater Monitoring IWand Analytical Results Chevron Service Station#9-3232 8660 Lower Sacramento Road Vertical Measurements are in feet Stockton,California Analytical results are in parts per billion(ppb) Well Ground Depth DA'T'E head Water To Notes TPH- Benzene Toluene Ethyl- Xylenes MTBE Elev Elev Water Gasoline Benzene MW-1 11/04/98 13 02 -1891 31 93 1100 13 <1 0 43 <1 0 24 03/05/99 1302 -1848 3150 -- 104 169 <05 <05 0 514 <5 0 06/21/99 1302 -2003 3305 -- 706 129 <0 5 <0 5 <0 5 <5 0 09/13/99 1302 -2558 3860 -- 150 40 <0 5 0 82 <0 5 <2 5 12/15/99 1302 -2162 3464 -- 189 391 1 18 272 081 3 78 12/22/99 1302 -2208 35 10 Gauging only -- -- -- -- -- -- 03/29/00 1302 -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 MW-2 11/04/98 1376 -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 3371 -- 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 -2247 3623 -- 46,100 7660 990 <50 2630 <250 12/22/99 1376 -2060 3436 Gauging only -- -- -- -- -- -- 03/29/00 1376 -1799 3175 -- 9500 1550 47 1040 150 <250 06/22/00 1376 -2119 34.95 -- 15,000' 2,600 1,100 1,300 2,300 <50/<2 0' MW-3 11/04/98 1285 -2237 35 22 -- 18,000 2900 720 1100 2500 <125 03/05/99 1285 -1852 3137 -- 793 23 1 263 129 <1 25 186 06/21/99 1285 -1707 2992 Inaccessible -- -- -- -- -- -- 09/13l99 1285 -2566 3851 -- 100 2 6 <0 5 <0 5 <0 5 2 5 12/15/99 12 60** -2162 3422 Inaccessible -- -- -- -- -- -- 12/22/99 1260 -2145 3405 -- 4040 1040 31 6 226 235 <200 03/29/00 1260 -18 15 3075 -- 4000 482 660 389 170 <50 06/22/00 1260 -21.37 3397 Inaccessible -• -- -- -- -- -- **Well head elevation changed due to well head maintenance 9-3232 xis/#386463 1 As of 06/22/00