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i i 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) (pglL) (pglL) (,ug1L) (pglL) ({rgll-) (pglL) (pg1L) (mg/L) Comments VW-3B 12/14/1998 - 1501 1 3790 -2289 571 - <0 5 <0 5 <0 5 105 <50 - No FP No S 3/31/1999 - 1501 3581 -2080 <50 <0 5 <0 5 <0 5 <0 5 <50 - No FP,No S 6/1111999 -- 1501 3460 -1959 152 - 1 9 <0 5 699 162 186 - No FP No S 9/10/1999 - 1501 3877 -2376 1,210 - 546 <0 5 545 137 1,590 - No FP,No S 12/3/1999 -- 1501 3876 -2375 804 - <05 <05 <0 5 <0 5 149 - No FP No S 4/3/2000 -- 1501 3545 -2044 <50 - 338 <0 5 186 562 296 - No FP No S 6/22/2000 - 1501 3551 -2050 1,690 - 848 384 227 432 3,180[4] - No FP,No S 9/27/2000 - 15 01 4081 -2580 NS - NS NS NS NS NS -- No FP,No S 10/19/2000 -- 15 01 4064 -2563 NS -- NS NS NS NS NS - No FP,No S 12/20/2000 - 1501 3871 -2370 <50 - <05 <0 5 <0 5 <0 5 265141 - No FP,No S 3/16/2001 1501 3760 -2259 <50 - <05 <05 <05 <0 5 912[4] - No FP,No S 6/21/2001 - 1501 4043 -2542 <1,000" - 97 1 53 290 750 5,000[4] - No FP,No S 9/13/2001 - 1501 4619 -31 18 <50 - <0 5 <05 <0 5 <0 5 90[4] - [8],No FP,No S 12/11/2001 -- 1501 4341 -2840 <50 - <0 50 <0 50 <0 50 <0 50 200[4] - No FP,No S 3/14/2002 -- 1501 4037 -2536 <50 - <050 <0 50 <0 50 <050 26[4] -- No FP,No S 6/19/2002 - 1501 4271 -2770 460[7] - <0 50 <0 50 <050 <0 50 1,500[4] - No FP,No S 9/12/2002 - 1501 4960 -3459 320 - <2 5 <2 5 <2 5 <2 5 140 - No FP,No S 12!312002 -- 1501 4660 -3159 <500 - <50 <50 <5 0 <50 69 -- No FP,No S 03/11/2003 P 1501 4651 -3150 380 J - <2 5 <2 5 <2 5 <2 5 370[4] 095 06/09/2003 P 1501 4239 -2738 2 600 - <10 <10 <10 <10 6 900[4) 286 09117/2003 P 1501 5162 -3661 110 R - <50 <50 <50 <50 210[4] 188 12/11/2003 P 1501 4638 -3137 16,000 - 1,100 930 1,100 4,300 3,500[4] - 03/10/2004 P 1501 4667 -3166 76 -- <10 <10 <10 <10 240[4]J 194 06/17/2004 P 1398 4843 -3445 <50 - <25 <25 <2 5 <2 5 180[4) 090 09/23/2004 P 1398 5455 -4057 94 - 1 8 19 061 12 45[4] 120 1 2/21/2004 P 1398 4906 -3508 320 - <12 <12 <12 66 250[4] 131 03/30/2005 P 1398 4499 -3101 <50 - <0 50 <0 50 <0 50 <0 50 3 2[4] 133 06/1312005 1 P 1 1398 4303 1 -2905 1 <50 1 -- I <0 50 1 <0 s0 <0 50 <0 so 6 2[4] 071 VW-4 06/17/2004 - 1471 - - - - - - -- - -- - Not Sampled,Well Dry 09/23/2004 - 1471 -- - -- -- - -- -- - - - Not Sampled,Well Dry 12/21/2004 -- 1471 - - - -- - - - -- - - Insuf fent Water,Not Sampled 03/30/2005 -- 1471 - - - -- - - - - - - Well Dry,Not Sampled Report Date July 21,2005 Page 11 of 13