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� i M Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2130 7906 N EL Dorado Street, Stockton, CA TOC Depth to Water Level Ethyl- Total Well Date P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (4vg1L) (pgll-) (pg/L) (pg/L) (erg/L) (pg/L) (pgll) (mg1L) Comments MW-5 2/28/1995 -- 1510 5478 -3968 310 — 70 14 59 5 NA -- No FP,No S 5/19/1995 -- 1510 5285 -3775 66 — 84 <05 0 5 <0 5 NA — No FP No S 8/28/1995 -- 1510 5461 -3951 130 -- 27 <0 5 4 5 06 NA -- No FP,No S 12/7/1995 - 1510 5320 -3810 <200** — 21 <05 07 <05 NA — No FP,No S 2/5/1996 1510 5067 -3557 <200** — 3 <0 5 09 <0 5 NA — No FP,No S 5/30/1996 — 1510 4770 -3260 140*" -- 15 <0 5 52 <0 5 <4** — No FP,No S 9/18/1996 — 1510 51 56 -3646 <300*** -- 33 <0 5 9 <0 5 <3 -- No FP,No S 11/26/1996 — 1510 4934 -3424 <200*** -- 19 <0 5 0 5 <0 5 <4** -- No FP No S 3/24/1997 — 1510 4424 -2914 <200*'* — 3 2 <05 1 6 3 <8** No FP,No S 5/20/1997 -- 1510 4485 -2975 270 -- 31 5 5 15 <20** — No FP,No S 8/19/1997 -- 1510 48 37 -3327 100 — 20 <0 5 3 8 <0 5 <5 — No FP,No S 11/19/1997 -- 1510 46 62 -3152 <50 -- 1 2 094 <05 091 <5 — 3/4/1998 - 1510 4190 -2680 <50 — 56 1 8 16 31 <5 -- No FP,No S 6/26/1998 — 1510 3964 -2454 <50 — 419 0 624 0 794 1 <5 -- 9/1/1998 -- 1510 4144 -2634 <50 — 132 <0 5 139 0 535 515 -- 12/2/1998 — 1510 3874 -2364 <50 — 0 693 <0 5 <0 5 <0 5 894 — 3/31/1999 -- 1510 3517 -2007 <50 -- 133 0 586 <0 5 152 994 — 6/4/1999 -- 1510 3648 -2138 <50 -- 503 0 721 <0 5 16 706 -- 9/2/1999 — 1510 4105 -2595 <50 — 614 <0 5 183 0 848 <5 -- 11/29/1999 — 1510 3916 -2406 <50 -- 0 585 0 633 <0 5 145 2 69 -- 3/16/2000 -- 1510 3516 -2006 571 — 517 <0 5 <0 5 <0 5 493 -- 6/26/2000 — 1510 3780 -2270 523 -- 369 <0 5 22 0 825 <2[2] -- 9/28/2000 — 1510 4205 -2695 <50 -- 1 34 <0 5 <0 5 <0 5 <2[2] — 12/19/2000 1510 3758 -2258 <50 — 0 561 149 <0 5 3 556 -- 3/15/2001 — 1510 3550 -2040 916[3) -- <2[4] 6 71 [4] <2[4] <2[4] 89 2[2] -- 6/20/2001 — 1510 3882 -2372 78(3] -- 2 5[4] 5 5[4] 4 7[4] 11[4] 60[2] — 9/12/2001 1510 4305 -27 95 <50 — <2[4] <2[4] <2[4] <2[4] 29[2] -- 12/12/2001 — 1510 3989 1 -2479 <50 <1 0[4] <1 0[4) <1 0[4] 1 2[4] 1 25[2] — 3/13/2002 - 1510 3699 -21 89 <50 — <050 061 <0 50 <0 50 35[2] - 6/18/2002 1510 3919 -2409 <50 — <050 061 <0 50 33 7 8[2] -- 9/11/2002 — 1510 4433 -2923 63 - 34 5 19 14 91[2] -- 12/18/2002 - 1510 4168 -2658 <50 <050 44 <0 50 58 20[2] — 03/06/20031 P 1 1510 3934 -2424 <50 -- 1 5 17 051 32 3_0[2] 06 Report Date August 4,2004 Page 10 of 20