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s s • 3 Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2186 3212 N California, 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) (ug1L) (ug1L) (ug/L) (ug1L) (ug1L) (ug1L) (u91L) (mg1L) Comments MW-4 12/11/2001 1383 4243 -2860 84[7] — <0 50 <0 50 <0 50 <0 50 5,600[4] — No FP No S 3/14/2002 -- 1383 3926 -2543 88[7] — <0 50 <0 50 <0 50 <0 50 4,900[4] — No FP,No S 6/19/2002 1383 4146 -2763 540[7] — <0 50 <0 50 <0 50 <0 50 2,900[4] — No FP,No S 9/12/2002 -- 1383 4862 -3479 <50,000 — <500 <500 <500 <500 16,000 No FP, No S 12/3/2002 — 1383 4554 -31 71 <50,000 -- <500 <500 <500 <500 6 600 - No FP,No S 03/1112003 P 1383 4578 -3195 <25,000 — <250 <250 <250 <250 4 200[4] 0 5 06/09/2003 P 1383 4277 -2894 <500 -- <50 <50 <50 <5 0 3 200[4] 395 09/1612003 P 1383 5064 -3681 2,700 R — <250 <250 <250 <250 8,500[4] 231 12/11/2003 P 1383 4563 -31 80 3,000 R — <50 <50 <50 <50 6,500[4]J 03/10/2004 P 1383 4593 -3210 1,900 — <100 <100 <100 <100 6,900[41J 143 106117120041 P 1 1383 4739 -33 56 2,600 — <250 <250 <250 <250 1 10,000[4] 1 17 MW-5 9/13/2001 — 1276 4513 -3237 <50 — <0 5 <0 5 <0 5 <0 5 <2 0[4] -- No FP,No S 12/11/2001 -- 1276 4180 -2904 <50 -- <0 50 <0 50 <0 50 <0 50 <2 0[4] — No FP,No S 3/14/2002 — 1276 3870 -2594 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[4] -- No FP,No S 6/19/2002 - 1276 41 57 -2881 <50 -- <050 <0 50 <0 50 <0 50 <0 50[4] -- No FP,No S 9/12/2002 1276 4874 -3598 <50 — <05 <0 5 <0 5 <0 5 <05 — No FP,No S _ _ < <05 <05 18 <05 -- No FP No 12/3/2002 12 76 45 05 -32 29 81 0 5 03/11/2003 P 1276 4498 -3222 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50(4] 1 33 06/09/2003 P 1276 4201 -2925 <50 — <0 50 <0 50 <0 50 <0 50 <0 50(4] 256 09/17/2003 P 1276 5068 -3792 <50 - <0 50 <0 50 <0 50 <0 50 <0 50[41 196 12/11/2003 P 1276 44 89 -3213 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] -- 03/10/2004 P 1276 4512 -3236 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[41 206 06/1712004 P 1276 1 4729 1 -3453 1 <50 — <0 50 <0 50 1 <0 50 1 <0 50 1 <0 50141 48 _ MW-6 9/13/2001 — 1382 45 76 -3194 <50[61 -- <0 5(6] <0 5[6) <0 5[6] <0 5[61 <2 0[4][6] — INo FP,No S 1211112001 - 1382 4264 -2882 <50 -- <0 50 <0 50 <0 50 <0 50 <2 0[4] -- No FP,No S 3/14/2002 - 1382 3955 -2573 <50 -- <050 <0 50 <0 50 <0 50 <0 50[4] — No FP,No S 6/19/2002 — 1382 41 57 -2775 <50 — <0 50 <050 <0 50 <0 50 <0 50[41 -- No FP No S 9/12/2002 — 1382 4930 -3548 <50 — <05 <0 5 <0 5 <0 5 <0 5 -- No FP,No S 12/3/2002 -- 1382 4580 -3198--- <50 — <05 <05 <0 5 <0 5 <05 — No FP,No S 03/11/2003 P 1382 4596 -3214 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] -- 06/09/2003 P 1382 4288 -2906 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[4] 31 09/17/2003 P 1382 51 08 -3726 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[4] 09 Report Date August 2,2004 Page 5 of 11