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TABLE 2 HISTORICAL GROUNDWATER CONDITIONS U-HAUL#709-50 STOCKTON,CALIFORNIA ' Well I D Depth to Ground- Castng Ground- water TPHg Benzene Toluene Date Benzene Total Xylenes Ref Elevation water Elevation (ug/L) (ug/L) (ug/L) (feet) (feet) (feet) (uglL) (uglL} May-93 7492 -5395 650 36 3 0 <1 0 52 (1) 28-Sep-94 7573 -5476 88 0 89 87 35 24 (2) 1-Dec-94 7226 -5129 500 97 67 47 35 (2) 21-Feb-95 6712 -46 15 630 97 100 11 52 (2) 16-May-95 6082 -3985 88 4 4 11 45 (2) 14-Aug-95 6574 -4477 <5 0 11 048 <03 15 (2) 24-Oct-95 6510 -4413 54 081 <0 3 056 21 (2) 8-Feb-96 5497 -3400 <50 28 39 086 45 (2) 26-Jun-96 5547 -3450 <50 05 0 5 05 23 (2) 26-Sep-96 6389 -4292 24-Sep-97 61 88 -4091 250 34 69 82 30 (2) ' 24-Mar-99 3868 -1771 <50 13 <0 5 <05 <0 5 (3) 3-Sep-99 4912 -2815 MW-4 May-93 7418 -5321 15000 1700 1200 63 1200 (1) 2097 28-Sep-94 7465 -5368 12000 3300 230 <120 270 (2) 1-Dec-94 71 22 -5025 2200 33 26 <3 0 92 (2) ' 21-Feb-95 6614 -4517 24000 4700 3600 350 1800 (2) 16-May-95 5981 -3884 8200 1900 970 210 660 (2) 14-Aug-95 64 57 -4360 66000 18000 12000 2300 9400 (2) 24-Oct-95 6409 -4312 40000 11000 5300 1200 4600 (2) 8-Feb-96 5407 -3310 4800 670 520 250 1100 (2) 26-Jun-96 5431 -3334 11000 1600 870 280 1600 (2) 26-Sep-96 6270 -4173 24-Sep-97 6071 -3974 32000 5200 540 1100 3700 (2) 24-Mar-99 3768 -1671 6300 45 37 100 31 (3) 3-Sep-99 48 05 -2708 MW-5 May-93 7386 -5371 580 41 <1 0 20 <1 0 (1) 20 15 28-Sep-94 7494 -5479 600 92 56 <1 5 5 3 (2) 11-Dec-94 71 45 -5130 420 40 <0 6 <06 <1 2 (2) 21-Feb-95 66 23 -4608 630 17 8 9 1 0 6 9 (2) 16-May-95 5994 -3979 50 50 1 8 <03 1 3 (2) 1 14-Aug-95 65 04 -4489 540 73 0 41 17 14 (2) 24-Oct-95 6419 -4404 <50 038 <0 3 077 23 (2) 8-Feb-96 5395 -3380 <50 075 034 <03 11 (2) ' 26-Jun-96 5472 -3457 <50 <0 5 <0 5 <0 5 <1 0 (2) 26-Sep-96 6322 -4307 24-Sep-97 61 12 -4097 <50 19 <0 5 <0 5 <0 5 (2) 1 24-Mar-99 3775 -1760 <50 <0 5 <0 5 <0 5 <0 5 (3) 3-Sep-99 48 45 -2830 ' Brett Ic lb[aeslu hau11709509wt Page 2 of 3 919/99