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• • i J Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2186 3212 N California, Stockton, CA TO 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) (pg/L) (/ig/L) (pg/L) (,ug/L) Wg1L) (pg1L) (Ng1L) {mglL) Comments MW-4 9/12/2002 -- 1383 4862 .3479 <50,000 — <500 <500 <500 <500 16,000 - No FP,No S 12!312002 — 1383 4554 -3171 <50,000 -- <500 <500 <500 <500 6 600 — No FP,No S 0311912003 P 1383 4578 -3195 <25,000 — <250 <250 1 <250 <250 4 200[4] 054 06/09/2003 P 1383 4277 -2894 <500 <5 0 <5 0 <5 0 <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 MW-5 9/13/2001 -- 1276 4513 -3237 <50 — <0 5 <0 5 <05 <0 5 <2 0[4] — No FP,No S 12/11/2001 — 1276 41 80 -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 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 - <0 5 <0 5 <0 5 <0 5 <0 5 -- No FP,No S 12/3/2002 — 1276 4505 -3229 81 -- <0 5 <0 5 <0 5 18 <0 5 -- No FP,No S 03/11/2003 P 1276 4498 -3222 <50 - <0 50 <0 50 <0 50 <0 50 <0 50[4] 133 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[4] 196 12/11/2003 P 1276 4489 -3213 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[4] -- 0311012004 P 1276 4512 -3236 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] 206 MW-5 9/13/2001 -- 1382 4576 -31 94 <50[6] -- <0 5[6] <0 5[6] <0 5[6] <0 5[6] <2 0[4][6] -- No FP,No S 12/11/2001 — 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 4157 -2775 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] -- No FP No S 9/12/2002 - 1382 4930 -3548 <50 -- <0 5 <0 5 <0 5 <0 5 <05 — No FP,No S 12!3!2002 1382 4580 -31 98 <50 -- <0 5 <0 5 <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 09117/2003 P 1382 5108 -3726 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[4] 087 12/11/2003 P 1382 4577 -31 95 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[4] — 03110/2004 P 1382 4610 -3228 <50 -- <0 50 <0.50 <0 50 <0 50 <0 50[4] 217 MW-7 9/13/2001 - 1397 4510 -31 13 <50[6) -- <0 5[6] <0 5[6] <0 5[6] <0 5[6] <2 0[4][6] -- No FP,No S 12/11/2001 -- 1397 4237 -2840 1 <50 — <0 50 <0 50 <0 50 <0 50 <2 0[4] -- No FP,No S 3/14/2002 — 1397 3933 -2536 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] -- No FP,No S 6/19/2002 - 1397 4169 -2772 <50 - <0 50 <0 50 <0 50 <0 50 <0 50[4) — No FP No S Report Date May 5,2004 Page 5 010