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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station Na 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) (pglL) (pg1L) (pgIL) (pg1L) (pg/L) U41-) WWI-) (mg/L) Comments MW-4 9/27/2000 -- 1383 3980 -2597 185 — 16 <0 5 0 542 117 6,590[4] — No FP,No S 10/19/2000 — 1383 3959 -2576 NA — NA NA NA NA NA -- Not observed 12/20/2000 -- 1383 3768 -2385 <50 -- <05 <0 5 <0 5 <0 5 1,170 -- No FP,No S 3/16/2001 — 1383 3650 -2267 <50 -- <05 <05 <0 5 <0 5 481[4] — No FP,No S 6/21/2001 1383 3937 -2554 <50 -- <0 5 <0 5 <0 5 <0 5 590[4] — No FP,No S 9/13/2001 -- 1383 4512 -3129 150 — <0 5 <05 <0 5 <0 5 7,600[4] -- No FP No S 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 88171 — <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!312002 -- 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] 054 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 -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[4],! 143 06/17/2004 P 1383 4739 -3356 2 600 -- <250 <250 <250 <250 10,000[4] 17 09/23/2004 P 1383 5370 -3987 840 -- <25 <25 <25 <25 2,500[4] —14 12/2112004 P 1383 4807 .3424 1,100 -- <120 <120 <120 <U0_1 2,800[4] 149 �— MW-5 9113/2001 -- 1276 4513 -3237 <50 — <05 <0 5 <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 - <050 <0 50 <0 50 <0 50 <0 50[4] -- No FP,No S 6/19/2002 1276 41 57 -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 <05 <0 5 <0 5 <05 — No FP,No S 12/3/2002 — 1276 4505 -3229 81 — <0 5 <05 <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] 1 33 06/09/2003 P 1276 4201 -2925 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] 256 09117/2003 P 1276 5068 -3792 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] 196 12/91/2003 P 1276 4489 -3213 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] -- 03/10/2004 P 1276 4512 -3236 <50 — <0 50 <050 <0 50 <0 50 <0 50[4] 206 06/17/2004 P 1276 4729 -3453 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] 4 8 09/23/2004 P 1276 5363 -4087 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] 2 5 12/21/2004 P 1 1276 4768 -3492 <50 -- <0 50 1 <0 50 1 <0 50 <0 50 <0 50[4] 344 Report Date January 18,2005 Page 5 of 12