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• • i Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2130 7906 N EL Dorado 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) (pg/L) (/rg/L) (lug/L) (pg/L) (pg/L) (pg/L) (pg/L) (mg/L) Comments VW-8 6/26/2000 3780 NA NA NA NA NA NA 9/28/2000 4203 NA NA NA NA NA NA - 12/19/2002 4157 290 46 14 12 31 <10 - 03/06/2003 P 3927 930 150 J 1 6 68 1 4 1 0[2] 1 2 06/11/2003 P 3817 530 81 1 9 1 23 1 3 <2 5[2] 2 97 09/24/2003 P 4221 11900 140 <50 200 270 <5 0[2] -- 12/10/2003 P 41 60 81 1 1 <0 50 <0 50 <0 50 4 9[2] - 03/08/2004 P 3936 1,500 120 <2 5 64 <2 5 <2 5[2] 1 06 06/24/2004 NP 4411 130 26 <2 5 <2 5 <2 5 2 8[2] 217 Water levels taken on 6/23/04 09/20/2004 P 4840 51,000 J 2,400 110 340 200 <50[2] 0 4 12/21/2004 P 4490 15,000 1,200 J 64 440 450 <5 0[2] 0 5 Water Level Data 12/20/04 03/27/2005 P 4165 4,100 1,200 120 320 250 <25[2) 10 06/19/2005 P 4203 10,000 J 710 J 1,100 710 J 1700 <12[2) 08 09/11/2005 P 4660 7,200 J 18 J <12 32 80 <12[2] 0 9 1.12/111/2005 P — 4343 — 2,700 — 550 58 220 170 <5 0[2] 0 4 VW-9 03/06/2003 -- -- - - - -- -- 12/10/2003 Well Dry 03/08/2004 - Well Dry 06/23120041 NP Well Dry, Not Sampled 09/20/2004 Well Dry,Not Sampled 12/20/2004 Not Sampled,Well Dry 03/28/2005 -- - -- - Well Dry,Not Sampled 06/19/2005 - Dry 09/11/2005 -- - -- - Well Dry, Not Sampled 12/11/2005 — -- — — — -- — — -- — — — Not Sampled,Well Dry VW 10 12/19/2002 41 59 14,000 2,800 890 890 3,600 <100[2] - 03/06/2003 P 3913 20 000 2,600 260 1,300 4,900 <50[2] 2 3 06/11/2003 P 3866 14,000 1,600 39 1,100 3,300 <25[2) 392 09/24/2003 P 4270 - 2,800 180 74 270 480 <5 0[2} 12/10/2003 P 41 61 20 000 3200 J 720 J 2,100 J 6,800 J <5 0[21 -- 03/08/2004 P 3919 1 500 110 <2 5 62 <2 5 <2 5[2) 276 Report pate January 25,2006 _ Page 22 of 25