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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 PI Elevation Water Elevation TPH9 TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pg/L) (NgIL) (KtL) (,ug/L) (pg/L) WIL) (mg/L) Comments MW-2 9/18/1996 – 1519 5180 -3661 920 – 150 <2 5* 22 35 <15* – No FP,No S 11/26/1996 – 1519 4960 -3441 520 -- 21 <05 27 06 7 -- No FP,No S 3/24/1997 – 1519 4450 -2931 <500— – <3" <3" <3'* <3'* <20** – No FP,No S 5/20/1997 -- 1519 4509 -2990 720 – 71 <1* 13 11 <6' – No FP,No S 8/19/1997 – 1519 4869 -3350 1,200 – 240 <5 41 <5 <50** – No FP,No S 11/19/1997 – 1519 4677 -3158 <50 – 1 7 089 <0 5 087 <5 – 3/4/1998 – 1519 4218 -2699 <50 – 22 <05 <05 <0 5 51 – No FP,No S 6/26/1998 -- 1519 3987 -2468 534 – 365 <0 5 <0 5 112 652 – 9/1/1998 – 1519 4161 -2642 322 – 484 <0 5 169 167 <5 - 12/2/1998 -- 1519 3894 -2375 390 -- <0 5 <0 5 0 735 <0 5 158 – 3/31/1999 – 1519 3538 -2019 987 – 66 069 0 579 233 655 – 6/4/1999 – 1519 3667 -2148 184 – 119 <0 5 103 0 669 126 – 9/2/1999 – 1519 4123 -2604 4,820 – 764 <10 375 <10 191 – 11/29/1999 – 1519 3936 -2417 791 – 4 25 <0 5 <0 5 114 654 – 3/16/2000 – 1519 3539 -2020 <50 – <05 <0 5 <0 5 <05 289 -- 6/26/2000 – 1519 3799 -2280 435 – 33 0 588 122 206 6 3[2] – 9/28/2000 – 1519 4224 -2705 165[3] -- 658 <05 0 618 0 669 3 62[2] – 12/19/2000 – 1519 3792 -2273 <50 – <05 <0 5 <0 5 <0 5 <25 -- 3/15/2001 – 1519 3573 -2054 <50 – <2[4] <2[4] <2[4] <2[4] <2[2] – 6/20/2001 – 1519 3899 -2380 <50 – <2[4] <2[4] <2141 <2[4] <2[2] – 9/12/2001 – 1519 4329 -2810 <50 -- <2[4] <2[4] <2[4] <2[4] <2[2] -- 12/12/2001 – 1519 4020 -2501 <50 -- <1 0[4] <1 0[4) <1 0[4] <1 0[4] 1 2[2] - 3/13/2002 – 1519 3721 -2202 <50 – 062 <0 50 <0 50 <0 50 2 5[2] – 6/18/2002 – 1519 3738 -2219 <50 – 15 <0 50 <0 50 1 7 2 6[2] -- 9/11/2002 -- 1519 4449 -2930 <50 – 1 1 <0 50 <0 50 <0 50 3 0[2] – 12/18/2002 -- 15`19 4194 -2675 <50 – <0 50 <0 50 <0 50 <0 50 2 5[2] – 03/06/2003 P 1519 3955 -2436 <50 – <0 50 <050 <0 50 <0 50 0 60[2] 196 06/11/2003 P 1519 3899 -2380 <50 – <0 50 <0 50 <0 50 <0 50 <0 50[2] 266 09/23/2003 P 1519 4297 -2778 <50 – <0 50 <0 50 <0 50 <0 50 <0 50(2] – 12/09/2003 P 1519 4199 -2680 <50 – <0 50 <0 50 <0 50 <0 50 <0 5012] 11 -- 03/09/2004 P is 11 3959 -2440 <50 – <0 50 <0 50 <0 50 <0 50 <0 5012] 244 06/23/2004 P 1519 4444 -2925 <50 – 0 63 <0 50 <0 50 <0 50 <0 50121 174 09/20/2004 P 1519 4869 -3350 <50 – <2 5 <25 <2 5 <2 5 <2 5[2] – Report Date Jufy 27,2005 Page 6 of 23