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s • s Table I 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 PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (kg/L) (jig/l-) (Erg/l-) WWI-) (,vg/L) (erg/L) (pg/L) (mg/L) Comments MW-4 12/3/1999 — 1383 3764 -2381 641 — <0 5 <05 <0 5 <0 5 731 -- No FP,No S 413!2000 — 1383 3430 -2047 <50 — <0 5 <05 <0 5 <0 5 166 -- No FP,No S 6/22/2000 — 1383 3437 -2054 232 — <2 0 <2 0 <2 0 <2 0 2,070[4] -- No FP, No S 9/27/2000 - 1383 3980 -2597 185 -- 16 <05 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 — <0 5 <05 <0 5 <0 5 1,170 -- No FP,No S 3116/2001 - 1383 3650 -2267 <50 — <05 <0 5 <0 5 <0 5 481[4] — No FP,No S 6121/2001 -- 1383 3937 -2554 <50 — <05 <05 <0 5 <0 5 590[4] -- No FP,No S 9/13/2001 — 1383 4512 -31 29 150 -- <0 5 <0 5 <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 88[7] — <050 <0 50 <0 50 <0 50 4,90014] — No FP,No S 6/19/2002 1383 41 46 -2763 540[7) — <0 50 <0 50 <0 50 <0 50 2,900141 -- 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] 054 06/09/2003 P 1383 4277 -2894 <500 -- <50 <50 <5 0 <5 0 3,20014] 395 09116/2003 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 06117/2004 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] 1 4 12/21/2004 P 1383 4807 -3424 1 100 — <120 <120 <120 <120 2,800[4] 149 03/30/2005 P 1383 4397 -3014 <50 -- <050 <0 50 <0 50 <0 50 27[4] 447 MW-5 9/13/2001 - 1276 4513 -3237 <50 -- <0 5 <05 <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 4157 -2881 <50 — <0 50 <0 50 <0 50 <050 <0 50[4] -- No FP, No S 9/12/2002 -- 1276 4874 -3598 <50 -- <0 5 <05 <05 <0 5 <05 -- No FP,No S 12/3/2002 — 1276 4505 -3229 81 — <0 5 <05 <0 5 18 <05 -- 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 44 89 -3213 <50 — <0 50 <0,50 <0 50 <0 50 <0 50[4] -- Report Date April 25,2005 Page 5 of 12