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ICE 1 Al, Groundwater Monitoring and Analytical Data Former ARCO Service Station No.2168 441 Charter Way Stockton,California Elevation Top of Static Water Groundwater Depth to Ethyl- Total Dissolved Well ID Casing(feet Level Elevation Screen TPHG Benzene Toluene benzene Xylenes MtBE Oxygen &Sample Date msl). (feet bgs) (feet msl) (feet bgs) ug/L ug/L ug/L ug/L ug/L ug/L (mg/L) 5/17/2001 20.95 -10.69 425[5] 158 3.95 9.09 7.3 <2 2.9 MW-1B 8/16/2001 22.34 -12.08 67 0.66 <0.5 2.2 1.5 <2 2.0 (cont.) 12/6/2001 23.37 -13.11 77[8] 30 0.63 2.2 1.3 <0.50 1.1 2/14/2002 21.71 -11.45 <50 5.8 0.68 <0.50 0.76 <0.50 1.7 6/13/2002 22.06 -11.80 <50 3.6[11] <0.50 <0.50 0.60[11] <0.50 1.3 8/22/2002 23.14 -12.88 <50 2.8 <0.50 <0.50 0.52 <0.50 1.1 11/13/2002 24.00 -13.74 <50 7.0 <0.50 <0.50 <0.50 <0.50 2//12//�2003 -- -- Not Sampled 7S Z�10033 - _13 Not Sampled O MW-IC 8/30/2000 10.21 22.19 -11.98 105.0 53.7 6.3 <2 <2 4.06 <2 NA 11/21/2000 21.69 -11.48 62.3[4] 5.69 1.21 0.999 3.51 <2 NA 2/15/2001 21.80 -11.59 <50 9.88 1.42 1.64 2.59 <2 0.8 5/17/2001 _ �j.')(� .21.23 -11.02 <50 9.09 0.708 .1.57 1.18 <2 1.1 8/16/2001 22.66 -12.45 <50 4.2 0.65 <0.5 0.83 <2 2.4 12/6/2001 23.57 -13.36 <50 9.3 <0.50 1.4 0.72 <0.50 1.3 2/14/2002 22.17 -11.96 <50 10 0.59 1.8 1.7 <0.50 1.8 6/13/2002 22.41 -12.20 4.8[11] <0.50 0.9[11] 0.66[11] <0.50 <0.50 1.3 8/22/2002 23.29 -13.08 <50 4.0 <0.50 1.1 0.99 <0.50 1.3 11/13/2002 24.38 -14.17 <50 <0.50 <0.50 <0.50 <0.50 <0.50 -- 2/12/2003 -- - Not Sampled g 5/29/2003 -- � 13 Not Sampled MW-2 53 2/16/1995 10.83 37.48 -26.65 33.0 36,000 6,300 4,600 610 2,700 NA NA 5/17/1995 Well Inaccessible 53 8/15/1995 32.45 -21.62 20,000 3,500 2,000 280 1,300 NA NA 53 11/29/1995 32.62 -21.79 30,000 3,800 2,700 380 1,800 NA NA 2/27/1996 29.87 -19.04 Well not sampled 53 5/15/1996 28.16 -17.33 16,000 2,600 1,000 210 910 <200**[1] NA 53 8/22/1996 28.76 -17.93 34,000 5,900 2,500 560 2,300 <300**[1] NA 11/25/1996 28.95 -18.12 26,000 4,000 2,000 390 1,800 <300*[1] NA 2/24/1997 24.95 -14.12 22,000 3,100 1,300 340 1,400 <500**[1] NA 5/19/1997 24.84 -14.01 28,000 4,700 1,900 480 2,200 <300*[I] NA 52 8/21/1997 25.92 -15.09 15,000 3,000 1,200 320 1,200 <500**[1] NA 53 11/17/1997 26.94 -16.11 2,200 510 120 44 130 <100**[1] NA 53 2/9/1998 24.33 -13.50 15,000 3,700 790 440 1,000 <500**[1] NA 52 5/21/1998 20.38 -9.55 10,200 2,220 562 238 628 <100 NA 52 8/12/1998 20.57 -9.74 1,100 234 39.0 23.8 49.4 <2 NA kAJ5 BP ARC0\02168\Quarter1y\2168 GWUR 2Q03.x1s 2 of 9