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s � � Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2186 3212 N California 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) (pg1L) (pg/L) (oglL) (pglL) (pg/L) (pg/L) (pg1L) (mg/L) Comments MW-4 3/16/2001 — 1383 3650 -2267 <50 -- <05 <05 <0 5 <0 5 481[41 — No FP,No S 6/21/2001 — 1383 3937 -2554 <50 — <05 <05 <0 5 <0 5 590[4] -- No FP,No S 9/13/2001 — 1383 4512 -3129 150 -- <05 <05 <0 5 <0 5 7,600[4] — No FP,No S 12/11/2001 — 1383 4243 -2860 84[7] <050 <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] — <050 <050 <050 <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 -3171 <50,000 -- <500 <500 <500 <500 6,600 -- No FP,No S 03/11/2003 P 1383 4578 -3195 <25,000 — <250 <250 <250 <250 4,200[4] 05 06/09/2003 P 1383 4277 -2894 <500 - <50 <50 <50 <50 3,200[4] 395 09/16/2003 P 1383 5064 -3681 2,700 R — <250 <250 <250 <250 6,500[4] 231 12/11/2003 P 1383 4563 -3180 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[4]J 143 06/1712004 P 1383 4739 -33 56 2,600 — <250 <250 <250 <250 10,000[4] 17 09123/2004 P 1 1383 1 5370 - .3987 1 840 -- <25 1 <25 1 <25 <25 2,500[4] 14 MW-5 9/13/2001 — 1276 4513 -3237 <50 -- <05 <05 <0 5 <05 <2 0[4] — No FP,No S 12/11/2001 — 1276 4180 -2904 <50 — <050 <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 4157 -2881 <50 -- <0 50 <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 12/3/2002 -- 1276 4505 -3229 81 — <05 <0 5 <0 5 18 <0 5 — No FP,No S 03/11/2003 P 1 1276 4498 -3222 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[4] 133 06/0912003 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 -- <050 <0 50 <0 50 <0 50 <0 50[4] 196 12/11/2003 P 1276 4489 -3213 <50 -- <050 <050 <0 50 <0 50 <0 50[4] — 03/10/2004 P 1276 4512 -3236 <50 -- <0 50 <050 <0 50 <050 <0 50[4] 206 06117/2004 P 1276 4729 -3453 <50 — <050 <0 50 <0 50 <0 50 <0 50[4] 48 0912312004 P 1276 .53_63 -4087 <50 -- <0 50 <0 50 <050 <0 50 <0 50[4] 25 MW-6 9/13/2001 — 1382 4576 -3194 <50[6] — <0 5[6] <0 5(6] <0 5[6] 11 <0 5[6] <2 0[4][6) — No FP,No S 12/11/2009 — 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 — <0 50 <0 50 <0 50 <0 50 <0 50[4] -- No FP,No S 6/19/2002 -- 1382 41 57 -2775 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50141 — No FP,No S Report Date October 25,2004 Page 5 of 11